Generics in Java allow types (classes and interfaces) to be parameters when defining classes, interfaces, and methods. This provides type-safety and eliminates the need for casts. Some key points about generics include:
- Generic types accept type parameters that are substituted for concrete types when the class is instantiated.
- Raw types are non-parameterized classes/interfaces and bypass generic type checking.
- Generic methods accept type parameters to operate on parameterized types.
- Bounded type parameters allow restricting type arguments to subclasses of a specified type.
The document discusses several new features introduced in Java 5 that aim to simplify Java development:
1) New collection classes and concurrent utilities were added to the Java library to provide more robust functionality out of the box.
2) Covariant returns allow overriding methods to have a more specific return type as long as it extends the original return type.
3) Enhanced for loops (foreach loops) improve readability when iterating over collections by eliminating the need for iterators.
4) Autoboxing and unboxing automatically convert between primitives and their corresponding wrapper types.
In this session you will learn:
background and goals of generic programming
basics of generic classes = parameterized types
generic methods for general algorithms
inheritance rules for generic types
bounded type parameters
generic code and the Java Virtual Machine
restrictions and limitations
wildcard types and wildcard type capture
For more information, visit this link: https://www.mindsmapped.com/courses/software-development/online-java-training-for-beginners/
This document discusses generic programming in Java. It defines generic programming as writing reusable code for objects of different types. It provides examples of defining generic classes and methods, including placing bounds on type variables. It explains that generics are implemented using type erasure at runtime, where type parameters are replaced by their bounds or Object, and bridge methods are generated to preserve polymorphism. It notes some restrictions and limitations of generics in Java.
This document discusses various features of the C# programming language across different versions. It provides an overview of key C# concepts like object oriented programming, managed code, and garbage collection. It also summarizes major features introduced in each version of C# such as generics in C# 2.0, implicit typing in C# 3.0, and asynchronous methods in C# 5.0. The document explains concepts like inheritance, polymorphism, and the differences between abstract classes and interfaces.
Generics in Java allows the creation of generic classes and methods that can work with different data types. A generic class uses type parameters that appear within angle brackets, allowing the class to work uniformly with different types. Generic methods also use type parameters to specify the type of data upon which the method operates. Bounded type parameters allow restricting the types that can be passed to a type parameter.
Effective Java - Chapter 3: Methods Common to All Objectsİbrahim Kürce
This document summarizes Chapter 3 of Effective Java by Joshua Bloch on methods common to all objects in Java. It discusses overriding the equals, hashCode, toString, clone, and Comparable methods while obeying their general contracts. When overriding equals, you must ensure the method is reflexive, symmetric, transitive, consistent and returns false for null. hashCode must be overridden whenever equals is overridden to satisfy its contract. toString should provide a concise representation of the object. clone should only be overridden judiciously and super.clone invoked for non-final classes.
The document discusses various Java programming concepts including comments, identifiers, keywords, primitive data types, variables, objects, and access modifiers. It provides examples and definitions for each concept. The key points covered are the eight primitive data types in Java (boolean, char, byte, short, int, long, float, double), how to declare and initialize variables, how to construct objects using the new keyword, and the differences between public, private, protected, default, final, and abstract access modifiers.
C# is an object-oriented programming language where programs consist of objects that interact through methods. The document discusses C# program structure, sample code, how code is executed, and data types in C#. It provides details on value types like integers and floats, reference types like strings, and pointer types. Key features of C# include being case sensitive and requiring semicolons. The document also covers operators, variables, and keywords in C#.
The document discusses several new features introduced in Java 5 that aim to simplify Java development:
1) New collection classes and concurrent utilities were added to the Java library to provide more robust functionality out of the box.
2) Covariant returns allow overriding methods to have a more specific return type as long as it extends the original return type.
3) Enhanced for loops (foreach loops) improve readability when iterating over collections by eliminating the need for iterators.
4) Autoboxing and unboxing automatically convert between primitives and their corresponding wrapper types.
In this session you will learn:
background and goals of generic programming
basics of generic classes = parameterized types
generic methods for general algorithms
inheritance rules for generic types
bounded type parameters
generic code and the Java Virtual Machine
restrictions and limitations
wildcard types and wildcard type capture
For more information, visit this link: https://www.mindsmapped.com/courses/software-development/online-java-training-for-beginners/
This document discusses generic programming in Java. It defines generic programming as writing reusable code for objects of different types. It provides examples of defining generic classes and methods, including placing bounds on type variables. It explains that generics are implemented using type erasure at runtime, where type parameters are replaced by their bounds or Object, and bridge methods are generated to preserve polymorphism. It notes some restrictions and limitations of generics in Java.
This document discusses various features of the C# programming language across different versions. It provides an overview of key C# concepts like object oriented programming, managed code, and garbage collection. It also summarizes major features introduced in each version of C# such as generics in C# 2.0, implicit typing in C# 3.0, and asynchronous methods in C# 5.0. The document explains concepts like inheritance, polymorphism, and the differences between abstract classes and interfaces.
Generics in Java allows the creation of generic classes and methods that can work with different data types. A generic class uses type parameters that appear within angle brackets, allowing the class to work uniformly with different types. Generic methods also use type parameters to specify the type of data upon which the method operates. Bounded type parameters allow restricting the types that can be passed to a type parameter.
Effective Java - Chapter 3: Methods Common to All Objectsİbrahim Kürce
This document summarizes Chapter 3 of Effective Java by Joshua Bloch on methods common to all objects in Java. It discusses overriding the equals, hashCode, toString, clone, and Comparable methods while obeying their general contracts. When overriding equals, you must ensure the method is reflexive, symmetric, transitive, consistent and returns false for null. hashCode must be overridden whenever equals is overridden to satisfy its contract. toString should provide a concise representation of the object. clone should only be overridden judiciously and super.clone invoked for non-final classes.
The document discusses various Java programming concepts including comments, identifiers, keywords, primitive data types, variables, objects, and access modifiers. It provides examples and definitions for each concept. The key points covered are the eight primitive data types in Java (boolean, char, byte, short, int, long, float, double), how to declare and initialize variables, how to construct objects using the new keyword, and the differences between public, private, protected, default, final, and abstract access modifiers.
C# is an object-oriented programming language where programs consist of objects that interact through methods. The document discusses C# program structure, sample code, how code is executed, and data types in C#. It provides details on value types like integers and floats, reference types like strings, and pointer types. Key features of C# include being case sensitive and requiring semicolons. The document also covers operators, variables, and keywords in C#.
The document provides guidelines for various naming conventions including:
- Standards for naming variables, member functions, local variables, and method arguments.
- Standards for naming classes, interfaces and packages.
- Guidelines related to code documentation, comments and indentation.
- Common coding errors and best practices to avoid them.
This document discusses generics in .NET. It introduces generics, generic classes, interfaces, structs and methods. Generics allow defining type-safe and reusable collection classes without compromising type safety or performance. Generic classes encapsulate operations that are not specific to a data type, commonly used for collections. Generic interfaces avoid boxing/unboxing for value types. Methods can also be generic with the ability to apply constraints.
This document discusses various .NET system types and interfaces. It explains that base system types provide predefined data types, generics allow creation of type-safe collections, and nullable types allow value types to be assigned null values. It also covers exception handling using exception classes, customizing code with attributes, and implementing common interfaces like IComparable, ICloneable, and IDisposable.
The document discusses several key concepts in Visual Basic.NET including language fundamentals like statements, functions, and subroutines. It also covers forms, components, events, controls like buttons, text boxes, labels, timers, and picture boxes. The document discusses reserved words in VB.NET, data types, variables, operators, and guidelines for declaring variables.
A small presentation I developed that introduces lambda expressions and many of the common LINQ extension methods for a group of developers that were less familiar with these concepts.
This document provides an overview of character and string processing in Java. It discusses character data types, string classes like String, StringBuilder and StringBuffer, regular expressions for pattern matching, and examples of string manipulation methods. The document then presents a problem statement and overall plan to build a word concordance program that counts word frequencies in a given text document. It outlines a 4-step process to develop the program, including defining class structures, opening/saving files, building the word list, and finalizing the code.
This document discusses key concepts in Java programming including classes, methods, parameters, and invoking methods. It explains that a program consists of classes, a class contains methods, and a method contains statements. Methods can take parameters, which are initialized when the method is called and allow passing in values. Parameters act similarly to local variables but are declared in the method signature.
C++ Object oriented concepts & programmingnirajmandaliya
This document discusses various C++ concepts related to functions and operators. It defines what a default pointer is and how it receives addresses passed to a called function. It also discusses reference variables, inline functions, friend functions, default arguments, passing objects as parameters, function overloading, static members, function pointers, and operator overloading. It provides examples and explanations for each concept.
These slides show you how to use each major Dart feature, from variables and operators to classes and libraries, with the assumption that you already know, how to program in another language.
To learn more about Dart’s core libraries, see A Tour of the Dart Libraries. Whenever you want more details about a language feature, consult the Dart Language Specification.
Tip: You can play with most of Dart’s language features using DartPad (learn more). Open DartPad at https://dartpad.dartlang.org/
OCA Java SE 8 Exam Chapter 2 Operators & Statementsİbrahim Kürce
Operators in Java include unary, binary, and ternary operators that perform operations on operands. Binary operators like arithmetic, relational, and logical operators follow an order of precedence unless overridden by parentheses. Statements in Java include if-then, if-then-else, switch, while, do-while, for, and more to control program flow. The if-then statement and if-then-else statement evaluate conditions and execute code blocks conditionally. The switch statement compares a value to multiple case labels and executes the corresponding code block.
In computer programming, code smell is any symptom in the source code of a program that possibly indicates a deeper problem. Code smells are usually not bugs—they are not technically incorrect and do not currently prevent the program from functioning. Instead, they indicate weaknesses in design that may be slowing down development or increasing the risk of bugs or failures in the future.
This document discusses the Comparable and Comparator interfaces in Java. Comparable allows an object to compare itself to another object, while Comparator allows two objects to be compared to each other based on arbitrary criteria. The document provides examples of implementing these interfaces to allow collections like lists to be sorted. It also discusses function objects and anonymous classes in Java.
This document provides an overview of types in C#, including:
- C# is a strongly typed language where every variable, constant, and expression has a type.
- Types store information like memory usage, valid values, members, inheritance, and more. This ensures type safety.
- The document discusses built-in types, custom types defined by struct, class, interface and enum, and the common type system with value types and reference types.
This chapter discusses exceptions and assertions in Java. The key points are:
1. Exceptions represent error conditions and allow for graceful handling of errors rather than program crashes. Exceptions can be caught using try-catch blocks.
2. Checked exceptions must be caught or declared in a method, while unchecked exceptions do not require handling.
3. Assertions allow checking for expected conditions and throwing errors if conditions are not met. Assertions are enabled during compilation and execution.
The document provides an overview of Strings and StringBuilders in Java. It discusses Strings as immutable objects and how StringBuilders can be more efficient for modifying strings. It also covers common String and StringBuilder methods, when to use each, and exceptions in Java using try/catch blocks.
OCA Java SE 8 Exam Chapter 1 Java Building Blocksİbrahim Kürce
The document discusses key concepts in Java including classes, objects, fields, methods, variables, primitive types, reference types, and memory management. It explains that classes are the basic building blocks in Java programs and contain fields and methods. Objects are instances of classes that exist in memory. The document also covers variable scope, default initialization, and garbage collection in Java.
Effective Java - Methods Common to All ObjectsRoshan Deniyage
This document discusses the general contract that methods like equals, hashcode, and toString must follow when overridden in subclasses. The contract includes requirements like reflexivity, symmetry, transitivity, and consistency. It provides examples of how to correctly override equals while obeying this contract, such as making sure the method is symmetric and transitive. The best practice for a subclass like ColorPoint that adds a field is to use composition by containing the superclass rather than extending it, to avoid violating the equals contract.
The document provides an introduction to basic Java programming concepts including inputs and outputs, variables, and data types. It discusses how to take input using the Scanner class and output using System.out. It defines variables as containers that hold values and explains variable declaration, initialization, and naming conventions. The different types of variables like local, instance, and static variables are also described. Finally, the document covers Java data types like primitive types (int, float, etc.), their ranges and sizes, and type conversion and casting between types. It includes examples and lab problems to practice these concepts.
- Java uses streams to perform input and output operations which allow for fast processing. Streams are sequences of data composed of bytes.
- The main stream classes in Java are InputStream for reading data and OutputStream for writing data. These classes handle byte-oriented input/output.
- FileInputStream and FileOutputStream classes allow reading and writing of data to files by extending InputStream and OutputStream respectively. They are used for file handling operations in Java.
The document discusses Java streams and I/O. It defines streams as abstract representations of input/output devices that are sources or destinations of data. It describes byte and character streams, the core stream classes in java.io, predefined System streams, common stream subclasses, reading/writing files and binary data with byte streams, and reading/writing characters with character streams. It also covers object serialization/deserialization and compressing files with GZIP.
The document provides guidelines for various naming conventions including:
- Standards for naming variables, member functions, local variables, and method arguments.
- Standards for naming classes, interfaces and packages.
- Guidelines related to code documentation, comments and indentation.
- Common coding errors and best practices to avoid them.
This document discusses generics in .NET. It introduces generics, generic classes, interfaces, structs and methods. Generics allow defining type-safe and reusable collection classes without compromising type safety or performance. Generic classes encapsulate operations that are not specific to a data type, commonly used for collections. Generic interfaces avoid boxing/unboxing for value types. Methods can also be generic with the ability to apply constraints.
This document discusses various .NET system types and interfaces. It explains that base system types provide predefined data types, generics allow creation of type-safe collections, and nullable types allow value types to be assigned null values. It also covers exception handling using exception classes, customizing code with attributes, and implementing common interfaces like IComparable, ICloneable, and IDisposable.
The document discusses several key concepts in Visual Basic.NET including language fundamentals like statements, functions, and subroutines. It also covers forms, components, events, controls like buttons, text boxes, labels, timers, and picture boxes. The document discusses reserved words in VB.NET, data types, variables, operators, and guidelines for declaring variables.
A small presentation I developed that introduces lambda expressions and many of the common LINQ extension methods for a group of developers that were less familiar with these concepts.
This document provides an overview of character and string processing in Java. It discusses character data types, string classes like String, StringBuilder and StringBuffer, regular expressions for pattern matching, and examples of string manipulation methods. The document then presents a problem statement and overall plan to build a word concordance program that counts word frequencies in a given text document. It outlines a 4-step process to develop the program, including defining class structures, opening/saving files, building the word list, and finalizing the code.
This document discusses key concepts in Java programming including classes, methods, parameters, and invoking methods. It explains that a program consists of classes, a class contains methods, and a method contains statements. Methods can take parameters, which are initialized when the method is called and allow passing in values. Parameters act similarly to local variables but are declared in the method signature.
C++ Object oriented concepts & programmingnirajmandaliya
This document discusses various C++ concepts related to functions and operators. It defines what a default pointer is and how it receives addresses passed to a called function. It also discusses reference variables, inline functions, friend functions, default arguments, passing objects as parameters, function overloading, static members, function pointers, and operator overloading. It provides examples and explanations for each concept.
These slides show you how to use each major Dart feature, from variables and operators to classes and libraries, with the assumption that you already know, how to program in another language.
To learn more about Dart’s core libraries, see A Tour of the Dart Libraries. Whenever you want more details about a language feature, consult the Dart Language Specification.
Tip: You can play with most of Dart’s language features using DartPad (learn more). Open DartPad at https://dartpad.dartlang.org/
OCA Java SE 8 Exam Chapter 2 Operators & Statementsİbrahim Kürce
Operators in Java include unary, binary, and ternary operators that perform operations on operands. Binary operators like arithmetic, relational, and logical operators follow an order of precedence unless overridden by parentheses. Statements in Java include if-then, if-then-else, switch, while, do-while, for, and more to control program flow. The if-then statement and if-then-else statement evaluate conditions and execute code blocks conditionally. The switch statement compares a value to multiple case labels and executes the corresponding code block.
In computer programming, code smell is any symptom in the source code of a program that possibly indicates a deeper problem. Code smells are usually not bugs—they are not technically incorrect and do not currently prevent the program from functioning. Instead, they indicate weaknesses in design that may be slowing down development or increasing the risk of bugs or failures in the future.
This document discusses the Comparable and Comparator interfaces in Java. Comparable allows an object to compare itself to another object, while Comparator allows two objects to be compared to each other based on arbitrary criteria. The document provides examples of implementing these interfaces to allow collections like lists to be sorted. It also discusses function objects and anonymous classes in Java.
This document provides an overview of types in C#, including:
- C# is a strongly typed language where every variable, constant, and expression has a type.
- Types store information like memory usage, valid values, members, inheritance, and more. This ensures type safety.
- The document discusses built-in types, custom types defined by struct, class, interface and enum, and the common type system with value types and reference types.
This chapter discusses exceptions and assertions in Java. The key points are:
1. Exceptions represent error conditions and allow for graceful handling of errors rather than program crashes. Exceptions can be caught using try-catch blocks.
2. Checked exceptions must be caught or declared in a method, while unchecked exceptions do not require handling.
3. Assertions allow checking for expected conditions and throwing errors if conditions are not met. Assertions are enabled during compilation and execution.
The document provides an overview of Strings and StringBuilders in Java. It discusses Strings as immutable objects and how StringBuilders can be more efficient for modifying strings. It also covers common String and StringBuilder methods, when to use each, and exceptions in Java using try/catch blocks.
OCA Java SE 8 Exam Chapter 1 Java Building Blocksİbrahim Kürce
The document discusses key concepts in Java including classes, objects, fields, methods, variables, primitive types, reference types, and memory management. It explains that classes are the basic building blocks in Java programs and contain fields and methods. Objects are instances of classes that exist in memory. The document also covers variable scope, default initialization, and garbage collection in Java.
Effective Java - Methods Common to All ObjectsRoshan Deniyage
This document discusses the general contract that methods like equals, hashcode, and toString must follow when overridden in subclasses. The contract includes requirements like reflexivity, symmetry, transitivity, and consistency. It provides examples of how to correctly override equals while obeying this contract, such as making sure the method is symmetric and transitive. The best practice for a subclass like ColorPoint that adds a field is to use composition by containing the superclass rather than extending it, to avoid violating the equals contract.
The document provides an introduction to basic Java programming concepts including inputs and outputs, variables, and data types. It discusses how to take input using the Scanner class and output using System.out. It defines variables as containers that hold values and explains variable declaration, initialization, and naming conventions. The different types of variables like local, instance, and static variables are also described. Finally, the document covers Java data types like primitive types (int, float, etc.), their ranges and sizes, and type conversion and casting between types. It includes examples and lab problems to practice these concepts.
- Java uses streams to perform input and output operations which allow for fast processing. Streams are sequences of data composed of bytes.
- The main stream classes in Java are InputStream for reading data and OutputStream for writing data. These classes handle byte-oriented input/output.
- FileInputStream and FileOutputStream classes allow reading and writing of data to files by extending InputStream and OutputStream respectively. They are used for file handling operations in Java.
The document discusses Java streams and I/O. It defines streams as abstract representations of input/output devices that are sources or destinations of data. It describes byte and character streams, the core stream classes in java.io, predefined System streams, common stream subclasses, reading/writing files and binary data with byte streams, and reading/writing characters with character streams. It also covers object serialization/deserialization and compressing files with GZIP.
The document discusses Java input/output (I/O) streams. It covers byte streams like FileInputStream and FileOutputStream for reading and writing bytes. It also covers character streams like FileReader and FileWriter for reading and writing characters. Filtered streams like BufferedInputStream are discussed which add functionality to underlying streams. The document also covers random access files and the File class.
The document discusses Java I/O and provides an overview of key concepts like streams, readers/writers, files, serialization, and tokenization. It describes the different types of input/output streams, readers, and writers in Java and best practices for working with them. Examples are provided to demonstrate reading from and writing to files, streams, and using serialization and tokenization.
This document provides an overview of Java input/output (I/O) concepts including reading from and writing to the console, files, and streams. It discusses different I/O stream classes like PrintStream, InputStream, FileReader, FileWriter, BufferedReader, and how to read/write characters, bytes and objects in Java. The document also introduces new I/O features in Java 7 like try-with-resources for automatic resource management.
The document discusses input/output streams in Java. It covers:
- Different types of data storage including transient RAM and persistent storage like disks.
- I/O sources and destinations like consoles, disks, networks etc. and how streams represent sequential bytes to abstract I/O details.
- Common Java I/O stream classes like FileReader, FileWriter, InputStream and OutputStream for reading/writing text and binary data from files.
- Using File class to represent files and directories with methods to check attributes, read content and manipulate files.
The document discusses generics in .NET. It defines what generics are, provides examples of generic classes and methods, and explains the benefits of using generics such as type safety, performance, and code reuse. It also covers generic type parameters, constraints, and constructed generic types.
This document discusses .NET generics. It explains that generics allow creating reusable class and method templates that can work with different data types. This avoids duplicate code and provides type safety. Some key points made:
- Generics use placeholders like <T> for type parameters to make classes and methods reusable for multiple types.
- The .NET Base Class Library enhanced generics support with collections like List<T> and interfaces like IEnumerable<T>.
- Constraints can be applied to generic types using "where" to restrict them to implement particular interfaces. This provides type safety.
This document discusses Java generics and provides examples of how they can be defined and used. It explains that generics allow classes and methods to be defined independently of the specific type they operate on through the use of type parameters. When a generic class or method is instantiated or called, actual type arguments are provided to substitute the formal type parameters. This provides compile-time type safety while maintaining a single implementation of the class or method. The document also covers how generics are implemented using type erasure to remove types at compile time and insert casts as needed.
1. A class is a blueprint for objects that defines common properties and methods. It can include modifiers, name, superclass/interfaces, and a class body.
2. An object is created using the new keyword, assigning the object to a reference variable. Reference variables store an object's address in memory. Assigning one reference variable to another does not create distinct copies but points to the same object.
3. A method performs a specific task and can return a result. It includes modifiers, return type, name, parameters, and a method body. Method overloading allows methods with the same name but different parameters.
Generics allow the creation of reusable components that operate on data of unknown types. A generic class uses type parameters to specify placeholder types that are replaced by actual types when an instance is created. This allows methods, properties and events to be written that work for multiple data types. The example shows how a generic class Gen<T> can be used to store and retrieve integer and string values without needing casts. Generics provide type safety by ensuring the type of data stored matches the type expected when accessing members.
This document discusses templates in C++ and provides examples of template functions, classes, parameters, members, and specializations. It covers how templates allow code to be written generically for unspecified types and instantiated for specific types. It also discusses container classes, iterators, reference vs. value semantics, and how templates are used extensively in the Standard Template Library.
Static abstract members nelle interfacce di C# 11 e dintorni di .NET 7.pptxMarco Parenzan
Did interfaces in C# need evolution? Maybe yes. Are they violating some fundamental principles? We see. Are we asking for some hoops? Let's see all this by telling a story (of code, of course)
This document provides information on various .NET and C# concepts:
1. It begins with an example C# program that multiplies two numbers and prints the result, demonstrating basic program structure and comments.
2. It then covers identifiers, keywords, single-line and multi-line comments in C#, and the differences between value types and reference types.
3. The document concludes by discussing object-oriented programming concepts in C# like classes, constructors, destructors, methods, inheritance, polymorphism, abstraction, interfaces, and abstract classes.
We've all seen the big "macro" features in .NET, this presentation is to give praise to the "Little Wonders" of .NET -- those little items in the framework that make life as a developer that much easier!
Typescript is a strict syntactical superset of JavaScript that adds type safety. It allows defining type annotations for variables, functions, objects, and function return values to catch errors. Typescript uses a static and structural type system. Its types include primitives, objects, arrays, functions, classes, generics, and utility types. Typescript code compiles to JavaScript, so it doesn't change runtime behavior but can catch errors earlier.
The document discusses various topics in Objective-C including variables, data types, categories, protocols, and composite objects. It provides code examples to illustrate initializing objects, variable scope, enumerated data types, typedefs, data type conversion, categories, class extensions, protocols, delegates, and composite objects in Objective-C and compares some of these concepts to Java.
1) The document provides an overview of C++ basics including variables, data types, input/output, arithmetic operators, and comments. It discusses variable naming, declarations, initialization, and assignment.
2) Key data types discussed include integers, floating-point numbers, characters, Booleans, and strings. The string class allows strings to be manipulated similarly to other data types.
3) Input is handled with cin and output with cout. Escape sequences can be used to control formatting. Arithmetic operators allow expressions to be formed. Comments start with // and /* */.
C# programs use namespaces and classes. A class defines methods and variables. C# supports inheritance, interfaces, structs, and enums. The main method runs code. Common data types include primitive types like int and reference types like string. C# can read input, perform math operations, and conditionally execute code using if/else statements. Methods can pass parameters by value or reference.
The document provides an overview of advanced class features in Java, including method overloading, overriding, and constructors. It discusses the differences between overloaded and overridden methods, and how to call parent class methods using super. It also covers enumerations, wrapper classes, autoboxing/unboxing, annotations, and inner classes.
Java is an object-oriented programming language developed by Sun Microsystems to be small, simple, and portable across platforms. It uses classes and objects, inheritance, interfaces, and packages. A class is a template that defines objects, which are instances of a class. Inheritance allows classes to inherit attributes and behaviors from parent classes. Interfaces define behaviors without implementations. Packages organize related classes.
The document discusses the Common Type System (CTS) in .NET framework 4.5. It defines built-in data types that can be used, including value types that directly contain data and reference types that contain references to data stored in objects. The document also discusses declaring and initializing variables, converting data types, creating user-defined types like enums and structures, control statements like if/else and loops, methods including passing parameters, and method overloading.
C++ is a middle-level programming language developed by Bjarne Stroustrup starting in 1979 at Bell Labs. It runs on various platforms like Windows, Mac OS, and UNIX. The document provides an overview of key C++ concepts like basic syntax, comments, data types, variables, constants, operators, loops, functions, arrays, strings, pointers, references, structures, classes, inheritance, and input/output. It also lists common functions and their uses.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
In his public lecture, Christian Timmerer provides insights into the fascinating history of video streaming, starting from its humble beginnings before YouTube to the groundbreaking technologies that now dominate platforms like Netflix and ORF ON. Timmerer also presents provocative contributions of his own that have significantly influenced the industry. He concludes by looking at future challenges and invites the audience to join in a discussion.
GraphRAG for Life Science to increase LLM accuracyTomaz Bratanic
GraphRAG for life science domain, where you retriever information from biomedical knowledge graphs using LLMs to increase the accuracy and performance of generated answers
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
Maruthi Prithivirajan, Head of ASEAN & IN Solution Architecture, Neo4j
Get an inside look at the latest Neo4j innovations that enable relationship-driven intelligence at scale. Learn more about the newest cloud integrations and product enhancements that make Neo4j an essential choice for developers building apps with interconnected data and generative AI.
Sudheer Mechineni, Head of Application Frameworks, Standard Chartered Bank
Discover how Standard Chartered Bank harnessed the power of Neo4j to transform complex data access challenges into a dynamic, scalable graph database solution. This keynote will cover their journey from initial adoption to deploying a fully automated, enterprise-grade causal cluster, highlighting key strategies for modelling organisational changes and ensuring robust disaster recovery. Learn how these innovations have not only enhanced Standard Chartered Bank’s data infrastructure but also positioned them as pioneers in the banking sector’s adoption of graph technology.
UiPath Test Automation using UiPath Test Suite series, part 6DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 6. In this session, we will cover Test Automation with generative AI and Open AI.
UiPath Test Automation with generative AI and Open AI webinar offers an in-depth exploration of leveraging cutting-edge technologies for test automation within the UiPath platform. Attendees will delve into the integration of generative AI, a test automation solution, with Open AI advanced natural language processing capabilities.
Throughout the session, participants will discover how this synergy empowers testers to automate repetitive tasks, enhance testing accuracy, and expedite the software testing life cycle. Topics covered include the seamless integration process, practical use cases, and the benefits of harnessing AI-driven automation for UiPath testing initiatives. By attending this webinar, testers, and automation professionals can gain valuable insights into harnessing the power of AI to optimize their test automation workflows within the UiPath ecosystem, ultimately driving efficiency and quality in software development processes.
What will you get from this session?
1. Insights into integrating generative AI.
2. Understanding how this integration enhances test automation within the UiPath platform
3. Practical demonstrations
4. Exploration of real-world use cases illustrating the benefits of AI-driven test automation for UiPath
Topics covered:
What is generative AI
Test Automation with generative AI and Open AI.
UiPath integration with generative AI
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
2. What are Generics?
• In any nontrivial software project, bugs are simply a fact of life.
• Careful planning, programming, and testing can help reduce their pervasiveness, but
somehow, somewhere, they'll always find a way to creep into your code.
• This becomes especially apparent as new features are introduced and your code base
grows in size and complexity.
3. What are Generics?
• Fortunately, some bugs are easier to detect than others.
Compile-time bugs, for example, can be detected early on; you
can use the compiler's error messages to figure out what the
problem is and fix it, right then and there.
• Runtime bugs, however, can be much more problematic; they
don't always surface immediately.
• Generics add stability to your code by making more of your bugs
detectable at compile time.
4. What are Generics?
• In a nutshell, generics enable types (classes and interfaces) to be parameters when
defining classes, interfaces and methods.
• Much like the more familiar formal parameters used in method declarations, type
parameters provide a way for you to re-use the same code with different inputs.
• The difference is that the inputs to formal parameters are values, while the inputs to
type parameters are types.
5. Why Generics?
1. Elimination of casts.
The following code snippet without generics requires
casting:
List list = new ArrayList();
list.add("hello");
String s = (String) list.get(0);
When re-written to use generics, the code does not
require casting:
List<String> list = new ArrayList<String>();
list.add("hello");
String s = list.get(0); // no cast
6. Why Generics?
2. Enabling programmers to implement generic algorithms.
By using generics, programmers can implement generic algorithms that
work on collections of different types, can be customized, and are type
safe and easier to read.
3. Stronger type checks at compile time.
A Java compiler applies strong type checking to generic code and issues
errors if the code violates type safety. Fixing compile-time errors is easier
than fixing runtime errors, which can be difficult to find.
7. Generic Types:
• A generic type is a generic class or interface that is parameterized over
types.
• The following Box class will be modified to demonstrate the concept.
public class Box {
private Object object;
}
public void set(Object object){
this.object = object;
}
public Object get() {
return object;
}
8. Generic Types:
• Since its methods accept or return an Object,
• you are free to pass in whatever you want, provided that it is not one of
the primitive types.
• There is no way to verify, at compile time, how the class is used.
• One part of the code may place an Integer in the box and expect to get
Integers out of it, while another part of the code may mistakenly pass in
a String, resulting in a runtime error.
9. Generic Types:
• A generic class is defined with the following format:
• class name<T1, T2, ..., Tn> { /* ... */ }
• The type parameter section, delimited by angle brackets (<>), follows the
class name. It specifies the type parameters (also called type variables)
T1, T2, ..., and Tn.
10. A Generic Version of the Box Class
To update the Box class to use generics, you create a generic type declaration by changing the code
"public class Box" to "public class Box<T>". This introduces the type variable, T, that can be used
anywhere inside the class.
With this change, the Box class becomes:
public class Box<T> {
private T t;
}
public void set(T t) {
this.t = t;
}
public T get() {
return t;
}
11. A Generic Version of the Box Class
• All occurrences of Object are replaced by T.
• A type variable can be any non-primitive type you specify:
class type
interface type
array type
12. Type Parameter Naming Conventions
• By convention, type parameter names are single, uppercase letters.
The most commonly used type parameter names are:
E - Element (used extensively by the Java Collections Framework)
K - Key
N - Number
T - Type
V - Value
13. Invoking and Instantiating a Generic Type
• To reference the generic Box class from within your code, you must
perform a generic type invocation, which replaces T with some concrete
value, such as Integer:
Box<Integer> integerBox;
• It simply declares that integerBox will hold a reference to a "Box of
Integer", which is how Box<Integer> is read.
• You can think of a generic type invocation as being similar to an ordinary
method invocation, but instead of passing an argument to a method, you
are passing a type argument — Integer in this case — to the Box class
itself.
14. Invoking and Instantiating a Generic Type
• To instantiate this class, use the new keyword, as usual, but place
<Integer> between the class name and the parenthesis:
Box<Integer> integerBox = new Box<Integer>();
Box<Integer> integerBox = new Box<>();
15. Type Parameter and Type Argument:
• Many developers use the terms "type parameter" and "type
argument" interchangeably, but these terms are not the same.
When coding, one provides type arguments in order to create a
parameterized type. Therefore, the T in Box<T> is a type
parameter and the String in Box<Integer> is a type argument. This
lesson observes this definition when using these terms.
16. Multiple Type Parameters
• As mentioned previously, a generic class can have multiple type
parameters. For example, the generic OrderedPair class, which
implements the generic Pair interface:
public interface Pair<K, V> {
public K getKey();
public V getValue();
}
17. public class OrderedPair<K, V> implements Pair<K, V> {
private K key;
private V value;
public OrderedPair(K key, V value) {
this.key = key;
this.value = value;
}
public K getKey() {
return key;
}
public V getValue() {
return value;
}
}
18. Multiple Type Parameters
The following statements create two instantiations of the OrderedPair class:
Pair<String, Integer> p1 = new OrderedPair<String, Integer>("Even", 8);
Pair<String, String> p2 = new OrderedPair<String, String>("hello", "world");
The code, new OrderedPair<String, Integer>, instantiates K as a String and V as an
Integer. Therefore, the parameter types of OrderedPair's constructor are String and
Integer, respectively. Due to autoboxing, is it valid to pass a String and an int to the class.
You can also substitute a type parameter (i.e., K or V) with a parameterized type (i.e.,
Box<Integer>). For example, using the OrderedPair<K, V> example:
OrderedPair<String, Box<Integer>> p = new OrderedPair<>(“numbers", new Box<Integer>());
19. Raw Types
• A raw type is the name of a generic class or interface without any type
arguments.
• To create a parameterized type of Box<T>, you supply an actual type
argument for the formal type parameter T:
Box<Integer> intBox = new Box<>();
• If the actual type argument is omitted, you create a raw type of Box<T>:
Box rawBox = new Box();
• Therefore, Box is the raw type of the generic type Box<T>. However, a
non-generic class or interface type is not a raw type.
20. Raw Types
• Raw types show up in legacy code because lots of API classes (such
as the Collections classes) were not generic prior to JDK 5.0.
• When using raw types, you essentially get pre-generics behavior —
a Box gives you Objects. For backward compatibility, assigning a
parameterized type to its raw type is allowed:
Box<String> stringBox = new Box<>();
Box rawBox = stringBox;
// OK
21. Raw Types
• But if you assign a raw type to a parameterized type, you get a
warning:
Box rawBox = new Box();
Box<Integer> intBox = rawBox;
// rawBox is a raw type of Box<T>
// warning: unchecked conversion
• You also get a warning if you use a raw type to invoke generic methods
defined in the corresponding generic type:
Box<String> stringBox = new Box<>();
Box rawBox = stringBox;
rawBox.set(8); // warning: unchecked invocation to set(T)
• The warning shows that raw types bypass generic type checks,
deferring the catch of unsafe code to runtime. Therefore, you should
avoid using raw types.
22. Unchecked Error Messages
• As mentioned previously, when mixing legacy code with generic
code, you may encounter warning messages similar to the
following:
Note: Example.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
23. Generic Methods
• Generic methods are methods that introduce their own type
parameters.
• This is similar to declaring a generic type, but the type
parameter's scope is limited to the method where it is declared.
• Static and non-static generic methods are allowed, as well as
generic class constructors.
24. Generic Methods
• The syntax for a generic method includes a type parameter, inside
angle brackets, and appears before the method's return type. For
static generic methods, the type parameter section must appear
before the method's return type.
public static <T> void print(T t){
return t;
}
25. Bounded Type Parameters
• There may be times when you want to restrict the types that can
be used as type arguments in a parameterized type.
• For example, a method that operates on numbers might only want
to accept instances of Number or its subclasses. This is what
bounded type parameters are for.
• To declare a bounded type parameter, list the type parameter's
name, followed by the extends keyword, followed by its upper
bound, which in this example is Number.
• Note that, in this context, extends is used in a general sense to mean
either "extends" (as in classes) or "implements" (as in interfaces).
26. Bounded Type Parameters
public <T extends Number> void inspect(T t){
System.out.println(“Type: " + t.getClass().getName());
}
27. Bounded Type Parameters
• In addition to limiting the types you can use to instantiate a generic type,
bounded type parameters allow you to invoke methods defined in the bounds:
public class NaturalNumber<T extends Integer> {
private T n;
public NaturalNumber(T n) { this.n = n; }
public boolean isEven() {
return n.intValue() % 2 == 0;
}
}
• The isEven method invokes the intValue method defined in the Integer class
through n.
28. Refferences & Further Readings
• http://docs.oracle.com/javase/tutorial/java/generics/