This document provides an overview of the Java programming language. It discusses key features such as platform independence, object-oriented programming principles like inheritance and polymorphism, automatic memory management, and security features. It also covers basic Java concepts like primitive data types, variables, operators, control flow statements, methods, and classes.
- Java is a platform independent programming language that is similar to C++ in syntax but similar to Smalltalk in its object-oriented approach. It provides features like automatic memory management, security, and multi-threading capabilities.
- Java code is compiled to bytecode that can run on any Java Virtual Machine (JVM). The JVM then interprets the bytecode and may perform just-in-time (JIT) compilation for improved performance. This allows Java programs to run on any platform with a JVM.
- Java supports object-oriented programming principles like encapsulation, inheritance, and polymorphism. Classes can contain methods and instance variables. Methods can be called on objects to perform operations or retrieve data.
- Java is a platform independent programming language that is similar to C++ in syntax but similar to Smalltalk in its object-oriented approach. It provides features like automatic memory management, security, and multi-threading capabilities.
- Java code is compiled to bytecode that can run on any Java Virtual Machine (JVM). Only depending on the JVM allows Java code to run on any hardware or operating system with a JVM.
- Java supports object-oriented programming concepts like inheritance, polymorphism, and encapsulation. Classes can contain methods and instance variables. Methods perform actions and can return values.
This document provides an overview of the Java programming language. It discusses key features such as platform independence, object-oriented programming principles like inheritance and polymorphism, automatic memory management, and security features. It also covers basic Java concepts like primitive data types, variables, operators, flow control statements, methods, and classes.
Java is a platform independent programming language similar to C++ in syntax and Smalltalk in mental paradigm. It has features like automatic type checking, garbage collection, simplified pointers and network access. Java code is compiled to bytecode, which is interpreted by the Java Virtual Machine (JVM) on various platforms, making Java portable across different operating systems and hardware. Methods and data in Java classes can be declared as public or private to control access and eliminate errors between classes.
This document provides an overview of key Java concepts including:
- Java is an object-oriented, platform-independent programming language similar to C++ in syntax. It was developed by Sun Microsystems.
- Java features include automatic memory management, type safety, multi-threading, and network programming capabilities. Code is compiled to bytecode that runs on the Java Virtual Machine.
- Core Java concepts discussed include primitive types, variables, operators, control flow statements, methods, classes, objects, arrays, inheritance, polymorphism and encapsulation.
- Additional topics covered are packages, access modifiers, constructors, overloading, overriding, and inner classes.
This document provides an overview of key Java concepts including identifiers, literals, statements, variables, operators and expressions, references, objects, and classes. It discusses how identifiers are used to name variables, methods, and classes. It describes different types of literals and rules for specifying values. It outlines common Java statement types and syntax. It explains that variables can be primitive types or reference types, and must be declared before use. It covers precedence rules for operators and common expression examples. It distinguishes between object references and objects themselves. And it provides examples of creating objects from classes and accessing object properties through references.
This document provides an introduction to the Java programming language. It discusses that Java code is written in the Java programming language and compiled to Java Virtual Machine (JVM) byte code. The JVM then interprets the byte code on different platforms. Java code is portable across operating systems since it runs on the JVM. The document also covers Java classes, objects, primitive data types, arrays, scoping, and importing libraries. It provides an example of a simple "Hello World" Java program.
- Java is a platform independent programming language that is similar to C++ in syntax but similar to Smalltalk in its object-oriented approach. It provides features like automatic memory management, security, and multi-threading capabilities.
- Java code is compiled to bytecode that can run on any Java Virtual Machine (JVM). The JVM then interprets the bytecode and may perform just-in-time (JIT) compilation for improved performance. This allows Java programs to run on any platform with a JVM.
- Java supports object-oriented programming principles like encapsulation, inheritance, and polymorphism. Classes can contain methods and instance variables. Methods can be called on objects to perform operations or retrieve data.
- Java is a platform independent programming language that is similar to C++ in syntax but similar to Smalltalk in its object-oriented approach. It provides features like automatic memory management, security, and multi-threading capabilities.
- Java code is compiled to bytecode that can run on any Java Virtual Machine (JVM). Only depending on the JVM allows Java code to run on any hardware or operating system with a JVM.
- Java supports object-oriented programming concepts like inheritance, polymorphism, and encapsulation. Classes can contain methods and instance variables. Methods perform actions and can return values.
This document provides an overview of the Java programming language. It discusses key features such as platform independence, object-oriented programming principles like inheritance and polymorphism, automatic memory management, and security features. It also covers basic Java concepts like primitive data types, variables, operators, flow control statements, methods, and classes.
Java is a platform independent programming language similar to C++ in syntax and Smalltalk in mental paradigm. It has features like automatic type checking, garbage collection, simplified pointers and network access. Java code is compiled to bytecode, which is interpreted by the Java Virtual Machine (JVM) on various platforms, making Java portable across different operating systems and hardware. Methods and data in Java classes can be declared as public or private to control access and eliminate errors between classes.
This document provides an overview of key Java concepts including:
- Java is an object-oriented, platform-independent programming language similar to C++ in syntax. It was developed by Sun Microsystems.
- Java features include automatic memory management, type safety, multi-threading, and network programming capabilities. Code is compiled to bytecode that runs on the Java Virtual Machine.
- Core Java concepts discussed include primitive types, variables, operators, control flow statements, methods, classes, objects, arrays, inheritance, polymorphism and encapsulation.
- Additional topics covered are packages, access modifiers, constructors, overloading, overriding, and inner classes.
This document provides an overview of key Java concepts including identifiers, literals, statements, variables, operators and expressions, references, objects, and classes. It discusses how identifiers are used to name variables, methods, and classes. It describes different types of literals and rules for specifying values. It outlines common Java statement types and syntax. It explains that variables can be primitive types or reference types, and must be declared before use. It covers precedence rules for operators and common expression examples. It distinguishes between object references and objects themselves. And it provides examples of creating objects from classes and accessing object properties through references.
This document provides an introduction to the Java programming language. It discusses that Java code is written in the Java programming language and compiled to Java Virtual Machine (JVM) byte code. The JVM then interprets the byte code on different platforms. Java code is portable across operating systems since it runs on the JVM. The document also covers Java classes, objects, primitive data types, arrays, scoping, and importing libraries. It provides an example of a simple "Hello World" Java program.
This document discusses the different types of tokens in Java including keywords, identifiers, literals, operators, and separators. It provides examples and details for each token type. Keywords such as if, else, class cannot be used as identifiers. Identifiers name variables and follow naming rules. Literals represent fixed values like integers and strings. Operators perform operations on operands like addition and comparison. Separators include braces, brackets, parentheses and terminators used in code blocks and expressions.
Unit I Advanced Java Programming Courseparveen837153
This document provides information about an Advanced Java Programming course taught by Dr. S.SHAIK PARVEEN. It includes details about the course such as prerequisites, objectives, units, and basic Java syntax concepts covered. The document outlines topics like variable declarations, operators, control flow statements, arrays, and object-oriented programming concepts in Java. It aims to teach students advanced Java programming skills like implementing object-oriented principles, working with classes, methods, and threads, as well as creating applets, GUI components, and Java beans.
that's introduced for Students at Al-Azhar university Faculty of Engineering .
it talk about :
- what is programming .
- Java ?
- Data types .
- Operations .
- if condition
- loops
for any inquiries don't be hesitate to Contact me.
This document provides an overview of the Java programming language. It discusses key Java concepts like object-oriented programming, classes, methods, streams, and input/output. It also covers Java syntax like primitive types, variables, operators, flow control, and arrays. The document explains how Java code is compiled to bytecode and run on the Java Virtual Machine, making it platform independent.
Java allows writing code once that can run on any platform. It compiles to bytecode that runs on the Java Virtual Machine (JVM). Key features include automatic memory management, object-oriented design, platform independence, security, and multi-threading. Classes are defined in .java files and compiled to .class files. The JVM interprets bytecode and uses just-in-time compilation to improve performance.
At first glance, writing concurrent programs in Java seems like a straight-forward task. But the devil is in the detail. Fortunately, these details are strictly regulated by the Java memory model which, roughly speaking, decides what values a program can observe for a field at any given time. Without respecting the memory model, a Java program might behave erratic and yield bugs that only occure on some hardware platforms. This presentation summarizes the guarantees that are given by Java's memory model and teaches how to properly use volatile and final fields or synchronized code blocks. Instead of discussing the model in terms of memory model formalisms, this presentation builds on easy-to follow Java code examples.
The document discusses basic Java concepts including identifiers, keywords, literals, primitive data types, variables, operators, control flow statements, classes, methods, inheritance, polymorphism, packages and modifiers. It provides definitions and examples of key concepts like classes, objects, methods, inheritance, polymorphism, packages, modifiers, variables and data types. It also lists Java keywords, reserved words and literals.
Java tutorial for Beginners and Entry LevelRamrao Desai
This document provides an overview of key Java concepts including classes, objects, inheritance, interfaces, exceptions, and more. It begins with a roadmap and definitions of object-oriented concepts like class and object. It then covers class variables and methods, visibility, static vs non-static, constructors, and the this keyword. The document also discusses inheritance, polymorphism, interfaces, exceptions, and error handling in Java.
The document discusses key concepts in Java including:
1) The javadoc program generates API documentation from source code comments. Classes contain data fields and methods and can have inner classes.
2) Objects have lifetimes separate from primitive variables and remain in memory until garbage collected. Static methods and fields exist independently of any object.
3) Arrays are objects that are dynamically allocated and indexed starting at 0. Arrays know their own length and certain operations are defined on arrays.
Java agents and their instrumentation API offer developers the most powerful toolset to interact with a Java application. Using this API, it becomes possible to alter the code of running applications, for example to add monitoring or to inject security checks as it is done by many enterprise products for the Java ecosystem.
In this session, developers will learn how to program Java agents of their own that make use of the instrumentation API. Doing so, developers learn how the majority of tooling for the JVM is implemented and will learn about Byte Buddy, a high level code generation library that does not require any knowledge of Java byte code that is normally required for writing agents. In the process, developers will see how Java classes can be used as templates for implementing highly performant code changes that avoid the boilerplate of alternative solutions such as AspectJ or Javassist while still performing better than agents implemented in low-level libraries such as ASM.
Java is an object-oriented programming language created by James Gosling. It was originally called Oak but was later renamed to Java. The document discusses the different editions of Java including J2SE, J2EE, and J2ME. It also covers key Java technologies like applets, servlets, JSP, and Swing. The document provides an overview of Java features such as being platform independent, portable, multi-threaded, and having a Java Virtual Machine. It also discusses concepts like inheritance, interfaces, packages, exceptions, and input/output in Java.
This document provides an overview of Java generics through examples. It begins with simple examples demonstrating how generics can be used to define container classes (BoxPrinter) and pair classes (Pair). It discusses benefits like type safety and avoiding duplication. Further examples show generics with methods and limitations like erasure. Wildcard types are presented as a way to address subtyping issues. In general, generics provide flexibility in coding but their syntax can sometimes be complex to read.
This document provides an introduction to Java programming concepts including:
- Java is both a programming language and platform that is simple, architecture neutral, object-oriented, and portable.
- Java source code is written in .java files and compiled into .class files by javac before being executed by the Java Virtual Machine (JVM).
- The JVM allows Java programs to run on any platform without recompilation, providing platform independence.
- Key Java concepts covered include objects, classes, methods, variables, data types, operators, control flow, and arrays.
- Examples demonstrate how to write, compile, and run simple Java programs to illustrate these core programming concepts.
This document provides an overview of Module 02 - Basic Java Programming which covers basic Java programming concepts such as variables, data types, operators, classes, objects, and methods. It also discusses compiling and running Java applications from the command line and with an IDE. Hands-on labs are included to build a simple Java application with JDeveloper IDE, create a JAR file, and use JConsole to monitor a Java application.
This document provides an overview of object-oriented programming concepts in Java, including classes, objects, variables, methods, constructors, abstraction, encapsulation, inheritance, and polymorphism. It defines classes and objects, and describes how classes act as blueprints for objects. It explains the syntax for defining classes and class members like variables and methods. It also covers method overloading, different types of methods, and how constructors are used to initialize objects. The document concludes with brief explanations of abstraction, encapsulation, inheritance, and polymorphism as fundamental principles of object-oriented design.
This document provides examples of Java programming concepts and code snippets to demonstrate how to implement various Java features. It includes examples for Java basics like strings, arrays, files and directories as well as more advanced topics like collections, networking, threading and GUI programming. Each section breaks down a specific concept like string manipulation or environment settings into discrete code examples that show how to perform common tasks like comparing strings, setting the classpath, or splitting a string.
The document contains code snippets from 3 weekly coding assignments:
1) A Java program to check if a string is a palindrome. It compares characters at the beginning and end of the string.
2) A Java program to sort a list of names in ascending order using string comparison and swapping.
3) A Java program to count the frequency of words in a given text by tokenizing, sorting, and printing the words.
This document discusses the Java Memory Model (JMM) and how it describes how threads interact through memory in Java. It covers key aspects of the JMM including happens-before ordering, memory barriers, visibility rules, and how final fields and atomic instructions interact with the memory model. It also discusses performance considerations and how different processor architectures implement memory ordering.
This document provides an overview of the Java programming language. It discusses how Java is platform independent and compiles code to bytecode that runs on the Java Virtual Machine (JVM). Key Java features like automatic memory management, object-oriented design, and security are summarized. The document also covers Java syntax like data types, operators, control flow, and classes/methods. It provides examples of working with files, streams, and serialization in Java.
- Java is a platform independent programming language that is similar to C++ in syntax but similar to Smalltalk in its object-oriented approach. It provides features like automatic memory management, security, and multi-threading capabilities.
- Java code is compiled to bytecode that can run on any Java Virtual Machine (JVM). Only depending on the JVM allows Java code to run on any hardware or operating system with a JVM.
- Java supports object-oriented programming concepts like inheritance, polymorphism, and encapsulation. Classes can contain methods and instance variables to define objects.
This document provides an overview of the Java programming language. It discusses topics such as how Java code is compiled and run, Java's platform independence, object-oriented features like inheritance and polymorphism, basic syntax like variables and loops, and input/output stream manipulation. The document is intended as a tutorial or introduction to Java for learning purposes.
This document discusses the different types of tokens in Java including keywords, identifiers, literals, operators, and separators. It provides examples and details for each token type. Keywords such as if, else, class cannot be used as identifiers. Identifiers name variables and follow naming rules. Literals represent fixed values like integers and strings. Operators perform operations on operands like addition and comparison. Separators include braces, brackets, parentheses and terminators used in code blocks and expressions.
Unit I Advanced Java Programming Courseparveen837153
This document provides information about an Advanced Java Programming course taught by Dr. S.SHAIK PARVEEN. It includes details about the course such as prerequisites, objectives, units, and basic Java syntax concepts covered. The document outlines topics like variable declarations, operators, control flow statements, arrays, and object-oriented programming concepts in Java. It aims to teach students advanced Java programming skills like implementing object-oriented principles, working with classes, methods, and threads, as well as creating applets, GUI components, and Java beans.
that's introduced for Students at Al-Azhar university Faculty of Engineering .
it talk about :
- what is programming .
- Java ?
- Data types .
- Operations .
- if condition
- loops
for any inquiries don't be hesitate to Contact me.
This document provides an overview of the Java programming language. It discusses key Java concepts like object-oriented programming, classes, methods, streams, and input/output. It also covers Java syntax like primitive types, variables, operators, flow control, and arrays. The document explains how Java code is compiled to bytecode and run on the Java Virtual Machine, making it platform independent.
Java allows writing code once that can run on any platform. It compiles to bytecode that runs on the Java Virtual Machine (JVM). Key features include automatic memory management, object-oriented design, platform independence, security, and multi-threading. Classes are defined in .java files and compiled to .class files. The JVM interprets bytecode and uses just-in-time compilation to improve performance.
At first glance, writing concurrent programs in Java seems like a straight-forward task. But the devil is in the detail. Fortunately, these details are strictly regulated by the Java memory model which, roughly speaking, decides what values a program can observe for a field at any given time. Without respecting the memory model, a Java program might behave erratic and yield bugs that only occure on some hardware platforms. This presentation summarizes the guarantees that are given by Java's memory model and teaches how to properly use volatile and final fields or synchronized code blocks. Instead of discussing the model in terms of memory model formalisms, this presentation builds on easy-to follow Java code examples.
The document discusses basic Java concepts including identifiers, keywords, literals, primitive data types, variables, operators, control flow statements, classes, methods, inheritance, polymorphism, packages and modifiers. It provides definitions and examples of key concepts like classes, objects, methods, inheritance, polymorphism, packages, modifiers, variables and data types. It also lists Java keywords, reserved words and literals.
Java tutorial for Beginners and Entry LevelRamrao Desai
This document provides an overview of key Java concepts including classes, objects, inheritance, interfaces, exceptions, and more. It begins with a roadmap and definitions of object-oriented concepts like class and object. It then covers class variables and methods, visibility, static vs non-static, constructors, and the this keyword. The document also discusses inheritance, polymorphism, interfaces, exceptions, and error handling in Java.
The document discusses key concepts in Java including:
1) The javadoc program generates API documentation from source code comments. Classes contain data fields and methods and can have inner classes.
2) Objects have lifetimes separate from primitive variables and remain in memory until garbage collected. Static methods and fields exist independently of any object.
3) Arrays are objects that are dynamically allocated and indexed starting at 0. Arrays know their own length and certain operations are defined on arrays.
Java agents and their instrumentation API offer developers the most powerful toolset to interact with a Java application. Using this API, it becomes possible to alter the code of running applications, for example to add monitoring or to inject security checks as it is done by many enterprise products for the Java ecosystem.
In this session, developers will learn how to program Java agents of their own that make use of the instrumentation API. Doing so, developers learn how the majority of tooling for the JVM is implemented and will learn about Byte Buddy, a high level code generation library that does not require any knowledge of Java byte code that is normally required for writing agents. In the process, developers will see how Java classes can be used as templates for implementing highly performant code changes that avoid the boilerplate of alternative solutions such as AspectJ or Javassist while still performing better than agents implemented in low-level libraries such as ASM.
Java is an object-oriented programming language created by James Gosling. It was originally called Oak but was later renamed to Java. The document discusses the different editions of Java including J2SE, J2EE, and J2ME. It also covers key Java technologies like applets, servlets, JSP, and Swing. The document provides an overview of Java features such as being platform independent, portable, multi-threaded, and having a Java Virtual Machine. It also discusses concepts like inheritance, interfaces, packages, exceptions, and input/output in Java.
This document provides an overview of Java generics through examples. It begins with simple examples demonstrating how generics can be used to define container classes (BoxPrinter) and pair classes (Pair). It discusses benefits like type safety and avoiding duplication. Further examples show generics with methods and limitations like erasure. Wildcard types are presented as a way to address subtyping issues. In general, generics provide flexibility in coding but their syntax can sometimes be complex to read.
This document provides an introduction to Java programming concepts including:
- Java is both a programming language and platform that is simple, architecture neutral, object-oriented, and portable.
- Java source code is written in .java files and compiled into .class files by javac before being executed by the Java Virtual Machine (JVM).
- The JVM allows Java programs to run on any platform without recompilation, providing platform independence.
- Key Java concepts covered include objects, classes, methods, variables, data types, operators, control flow, and arrays.
- Examples demonstrate how to write, compile, and run simple Java programs to illustrate these core programming concepts.
This document provides an overview of Module 02 - Basic Java Programming which covers basic Java programming concepts such as variables, data types, operators, classes, objects, and methods. It also discusses compiling and running Java applications from the command line and with an IDE. Hands-on labs are included to build a simple Java application with JDeveloper IDE, create a JAR file, and use JConsole to monitor a Java application.
This document provides an overview of object-oriented programming concepts in Java, including classes, objects, variables, methods, constructors, abstraction, encapsulation, inheritance, and polymorphism. It defines classes and objects, and describes how classes act as blueprints for objects. It explains the syntax for defining classes and class members like variables and methods. It also covers method overloading, different types of methods, and how constructors are used to initialize objects. The document concludes with brief explanations of abstraction, encapsulation, inheritance, and polymorphism as fundamental principles of object-oriented design.
This document provides examples of Java programming concepts and code snippets to demonstrate how to implement various Java features. It includes examples for Java basics like strings, arrays, files and directories as well as more advanced topics like collections, networking, threading and GUI programming. Each section breaks down a specific concept like string manipulation or environment settings into discrete code examples that show how to perform common tasks like comparing strings, setting the classpath, or splitting a string.
The document contains code snippets from 3 weekly coding assignments:
1) A Java program to check if a string is a palindrome. It compares characters at the beginning and end of the string.
2) A Java program to sort a list of names in ascending order using string comparison and swapping.
3) A Java program to count the frequency of words in a given text by tokenizing, sorting, and printing the words.
This document discusses the Java Memory Model (JMM) and how it describes how threads interact through memory in Java. It covers key aspects of the JMM including happens-before ordering, memory barriers, visibility rules, and how final fields and atomic instructions interact with the memory model. It also discusses performance considerations and how different processor architectures implement memory ordering.
This document provides an overview of the Java programming language. It discusses how Java is platform independent and compiles code to bytecode that runs on the Java Virtual Machine (JVM). Key Java features like automatic memory management, object-oriented design, and security are summarized. The document also covers Java syntax like data types, operators, control flow, and classes/methods. It provides examples of working with files, streams, and serialization in Java.
- Java is a platform independent programming language that is similar to C++ in syntax but similar to Smalltalk in its object-oriented approach. It provides features like automatic memory management, security, and multi-threading capabilities.
- Java code is compiled to bytecode that can run on any Java Virtual Machine (JVM). Only depending on the JVM allows Java code to run on any hardware or operating system with a JVM.
- Java supports object-oriented programming concepts like inheritance, polymorphism, and encapsulation. Classes can contain methods and instance variables to define objects.
This document provides an overview of the Java programming language. It discusses topics such as how Java code is compiled and run, Java's platform independence, object-oriented features like inheritance and polymorphism, basic syntax like variables and loops, and input/output stream manipulation. The document is intended as a tutorial or introduction to Java for learning purposes.
This document provides an overview of the Java programming language including how it works, its features, syntax, and input/output capabilities. Java allows software to run on any device by compiling code to bytecode that runs on a virtual machine. It is object-oriented, supports features like inheritance and polymorphism, and has memory management and security benefits over other languages. The document also discusses Java concepts like classes, methods, arrays, and streams for file input/output.
This document provides an overview of the Java programming language including how it works, its features, syntax, and input/output capabilities. Java allows software to run on any device by compiling code to bytecode that runs on a virtual machine instead of a particular computer architecture. It is an object-oriented language with features like automatic memory management, cross-platform capabilities, and a robust class library.
Java allows for platform-independent programming through bytecode compilation. It uses a similar syntax to C++ and object model to Smalltalk. While interpreted, Java code is compiled to bytecode then executed by a Java Virtual Machine. Key Java concepts include primitive data types, variables, operators, conditional and looping statements like if/else, for, and while to control program flow.
This has been presented in association with Robosepians for Java concepts. Basic concepts of Java including features, conditional statements, loop statements, arrays, string, primitive datatypes, essentials of Java including oops concepts, classes, objects, polymorphism, advance topics including packages, exception handling, multihtreading and network programming have been discussed.
The document discusses key concepts in Java programming including:
1. Java is an object-oriented programming language that is platform independent and allows developers to create applications, applets, and web applications.
2. The Java code is first compiled to bytecode, which can then be executed on any Java Virtual Machine (JVM) regardless of the underlying hardware or operating system.
3. Core Java concepts covered include classes, objects, encapsulation, inheritance, polymorphism, and abstraction. Operators, flow control statements, arrays, strings and object-oriented programming principles are also summarized.
The document discusses Java architecture and fundamentals. It can be summarized as:
1. Java's architecture consists of four main components: the Java programming language, Java class files, the Java API, and the Java Virtual Machine (JVM).
2. When a Java program is written and run, it uses these four technologies. The program is written in Java source code and compiled to class files, which are then run on the JVM along with the Java API library.
3. The JVM handles execution by using areas like the method area for bytecode storage, the Java stack for method calls and parameters, and the heap for object instantiation and garbage collection.
The document discusses Java architecture and fundamentals. It can be summarized as:
1. Java's architecture consists of four main components: the Java programming language, Java class files, the Java API, and the Java Virtual Machine (JVM).
2. When a Java program is written and run, it uses these four technologies. The program is written in Java source code and compiled to class files, which are then run on the JVM along with the Java API library.
3. The JVM handles execution by using areas like the method area for bytecode storage, the Java stack for method calls and parameters, and the heap for object instantiation and garbage collection.
The document discusses Java architecture and fundamentals. It can be summarized as:
1. Java's architecture consists of four main components: the Java programming language, Java class files, the Java API, and the Java Virtual Machine (JVM).
2. When a Java program is written and run, it uses these four technologies. The program is written in Java source code and compiled to class files, which are then run on the JVM along with the Java API library.
3. The JVM handles execution by using areas like the method area for bytecode storage, the Java stack for method calls and parameters, and the heap for object instantiation and garbage collection.
The original Creative JavaScript tutorial, covering loops in JavaScript. This tutorial is aimed at creative people with no programming experience who are interested to learn loops JavaScript.
The document provides an introduction to the Java programming language. It discusses Java's history and key editions. It also covers basic Java concepts like compiling and running a simple "Hello World" program, primitive data types, variables, operators, conditional statements like if/else, and iterative structures like the for loop. Examples are provided throughout to demonstrate syntax and output.
The document discusses Java loops, arrays, methods, and classes. It provides examples of for, while, and do-while loops in Java. It also discusses defining arrays, accessing array elements, and iterating through arrays using for loops. The document explains what methods are in Java, how to define and call methods, and gives an example of a method that prints text. It concludes with an overview of object-oriented programming concepts in Java including classes, objects, attributes, methods, constructors, packages, and access modifiers.
Java is an object-oriented programming language and platform. It uses a virtual machine (JVM) to run bytecode, making Java programs platform independent. The JVM handles memory management through garbage collection. Java uses classes and objects to implement OOP concepts. Variables are declared with a specific primitive data type or class type. Java supports control flow statements like if/else and loops. Arrays allow storing multiple values of the same type. Methods define reusable blocks of code that can operate on objects.
JavaScript Cheatsheets with easy way .pdfranjanadeore1
The document provides information about JavaScript keywords and variables, data types, built-in objects, and the DOM. It explains that var, let, and const can be used to declare variables, with var providing function scope, let providing block scope, and const providing block scope and preventing reassignment. The document also summarizes functions, operators, conditional statements, loops, and other core JavaScript concepts.
The document discusses Scala and why some developers think it could replace Java on the JVM. It provides quotes from several influential developers, including the creator of Java and Groovy, expressing their view that Scala is the best candidate to replace Java in the long run. Specifically, James Gosling says that if he had to pick another language on the JVM besides Java, it would be Scala. Charlie Nutter describes Scala as the current heir apparent to the Java throne and the momentum behind Scala is now unquestionable. James Strachan says that if he had seen the Programming in Scala book in 2003, he may have never created Groovy and that his tip for a long term replacement for Java is
This document provides an overview of key concepts in the Java programming language, including:
- Java is an object-oriented language that is simpler than C++ and supports features like platform independence.
- The Java development environment includes tools for compiling, debugging, and running Java programs.
- Java programs work with basic data types like int and double, as well as user-defined classes, variables, and arrays.
- The document explains operators, control structures, formatting output, and the basics of classes and objects in Java.
This document provides an introduction to learning Java, including:
- An overview of Java as an object-oriented language developed by Sun Microsystems, featuring a virtual machine, portability, and memory management.
- Instructions for compiling and running a simple "Hello World" Java program from the command line.
- Explanations of Java programming basics like classes, methods, variables, operators, and control structures.
Understanding User Behavior with Google Analytics.pdfSEO Article Boost
Unlocking the full potential of Google Analytics is crucial for understanding and optimizing your website’s performance. This guide dives deep into the essential aspects of Google Analytics, from analyzing traffic sources to understanding user demographics and tracking user engagement.
Traffic Sources Analysis:
Discover where your website traffic originates. By examining the Acquisition section, you can identify whether visitors come from organic search, paid campaigns, direct visits, social media, or referral links. This knowledge helps in refining marketing strategies and optimizing resource allocation.
User Demographics Insights:
Gain a comprehensive view of your audience by exploring demographic data in the Audience section. Understand age, gender, and interests to tailor your marketing strategies effectively. Leverage this information to create personalized content and improve user engagement and conversion rates.
Tracking User Engagement:
Learn how to measure user interaction with your site through key metrics like bounce rate, average session duration, and pages per session. Enhance user experience by analyzing engagement metrics and implementing strategies to keep visitors engaged.
Conversion Rate Optimization:
Understand the importance of conversion rates and how to track them using Google Analytics. Set up Goals, analyze conversion funnels, segment your audience, and employ A/B testing to optimize your website for higher conversions. Utilize ecommerce tracking and multi-channel funnels for a detailed view of your sales performance and marketing channel contributions.
Custom Reports and Dashboards:
Create custom reports and dashboards to visualize and interpret data relevant to your business goals. Use advanced filters, segments, and visualization options to gain deeper insights. Incorporate custom dimensions and metrics for tailored data analysis. Integrate external data sources to enrich your analytics and make well-informed decisions.
This guide is designed to help you harness the power of Google Analytics for making data-driven decisions that enhance website performance and achieve your digital marketing objectives. Whether you are looking to improve SEO, refine your social media strategy, or boost conversion rates, understanding and utilizing Google Analytics is essential for your success.
Instagram has become one of the most popular social media platforms, allowing people to share photos, videos, and stories with their followers. Sometimes, though, you might want to view someone's story without them knowing.
Gen Z and the marketplaces - let's translate their needsLaura Szabó
The product workshop focused on exploring the requirements of Generation Z in relation to marketplace dynamics. We delved into their specific needs, examined the specifics in their shopping preferences, and analyzed their preferred methods for accessing information and making purchases within a marketplace. Through the study of real-life cases , we tried to gain valuable insights into enhancing the marketplace experience for Generation Z.
The workshop was held on the DMA Conference in Vienna June 2024.
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2. Java - General
Java is:
– platform independent programming
language
– similar to C++ in syntax
– similar to Smalltalk in mental paradigm
Pros: also ubiquitous to net
Cons: interpreted, and still under
development (moving target)
3. Java - General
Java has some interesting features:
– automatic type checking,
– automatic garbage collection,
– simplifies pointers; no directly accessible
pointer to memory,
– simplified network access,
– multi-threading!
4. Compile-time EnvironmentCompile-time Environment
Java
Bytecodes
move locally
or through
network
Java
Source
(.java)
Java
Compiler
Java
Bytecode
(.class )
Java
Interpreter
Just in
Time
Compiler
Runtime System
Class
Loader
Bytecode
Verifier
Java
Class
Libraries
Operating System
Hardware
Java
Virtual
machine
How it works…!
5. How it works…!
Java is independent only for one reason:
– Only depends on the Java Virtual Machine
(JVM),
– code is compiled to bytecode, which is
interpreted by the resident JVM,
– JIT (just in time) compilers attempt to
increase speed.
6. Java - Security
Pointer denial - reduces chances of
virulent programs corrupting host,
Applets even more restricted -
– May not
• run local executables,
• Read or write to local file system,
• Communicate with any server other than the
originating server.
7. Object-Oriented
Java supports OOD
– Polymorphism
– Inheritance
– Encapsulation
Java programs contain nothing but
definitions and instantiations of classes
– Everything is encapsulated in a class!
8. Java Advantages
Portable - Write Once, Run Anywhere
Security has been well thought through
Robust memory management
Designed for network programming
Multi-threaded (multiple simultaneous tasks)
Dynamic & extensible (loads of libraries)
– Classes stored in separate files
– Loaded only when needed
10. Primitive Types and Variables
boolean, char, byte, short, int, long, float, double etc.
These basic (or primitive) types are the only types
that are not objects (due to performance issues).
This means that you don’t use the new operator to
create a primitive variable.
Declaring primitive variables:
float initVal;
int retVal, index = 2;
double gamma = 1.2, brightness
boolean valueOk = false;
11. Initialisation
If no value is assigned prior to use, then the
compiler will give an error
Java sets primitive variables to zero or false
in the case of a boolean variable
All object references are initially set to null
An array of anything is an object
– Set to null on declaration
– Elements to zero false or null on creation
12. Declarations
int index = 1.2; // compiler error
boolean retOk = 1; // compiler error
double fiveFourths = 5 / 4; // no error!
float ratio = 5.8f; // correct
double fiveFourths = 5.0 / 4.0; // correct
1.2f is a float value accurate to 7 decimal places.
1.2 is a double value accurate to 15 decimal places.
13. All Java assignments are right associative
int a = 1, b = 2, c = 5
a = b = c
System.out.print(
“a= “ + a + “b= “ + b + “c= “ + c)
What is the value of a, b & c
Done right to left: a = (b = c);
Assignment
14. Basic Mathematical Operators
* / % + - are the mathematical operators
* / % have a higher precedence than + or -
double myVal = a + b % d – c * d / b;
Is the same as:
double myVal = (a + (b % d)) –
((c * d) / b);
15. Statements & Blocks
A simple statement is a command terminated by
a semi-colon:
name = “Fred”;
A block is a compound statement enclosed in
curly brackets:
{
name1 = “Fred”; name2 = “Bill”;
}
Blocks may contain other blocks
16. Flow of Control
Java executes one statement after the other
in the order they are written
Many Java statements are flow control
statements:
Alternation: if, if else, switch
Looping: for, while, do while
Escapes: break, continue, return
17. If – The Conditional Statement
The if statement evaluates an expression and if that
evaluation is true then the specified action is taken
if ( x < 10 ) x = 10;
If the value of x is less than 10, make x equal to 10
It could have been written:
if ( x < 10 )
x = 10;
Or, alternatively:
if ( x < 10 ) { x = 10; }
18. Relational Operators
== Equal (careful)
!= Not equal
>= Greater than or equal
<= Less than or equal
> Greater than
< Less than
19. If… else
The if … else statement evaluates an expression and
performs one action if that evaluation is true or a
different action if it is false.
if (x != oldx) {
System.out.print(“x was changed”);
}
else {
System.out.print(“x is unchanged”);
}
20. Nested if … else
if ( myVal > 100 ) {
if ( remainderOn == true) {
myVal = mVal % 100;
}
else {
myVal = myVal / 100.0;
}
}
else
{
System.out.print(“myVal is in range”);
}
21. else if
Useful for choosing between alternatives:
if ( n == 1 ) {
// execute code block #1
}
else if ( j == 2 ) {
// execute code block #2
}
else {
// if all previous tests have failed,
execute code block #3
}
22. A Warning…
WRONG!
if( i == j )
if ( j == k )
System.out.print(
“i equals k”);
else
System.out.print(
“i is not equal
to j”);
CORRECT!
if( i == j ) {
if ( j == k )
System.out.print(
“i equals k”);
}
else
System.out.print(“
i is not equal to
j”); // Correct!
23. The switch Statement
switch ( n ) {
case 1:
// execute code block #1
break;
case 2:
// execute code block #2
break;
default:
// if all previous tests fail then
//execute code block #4
break;
}
24. The for loop
Loop n times
for ( i = 0; i < n; n++ ) {
// this code body will execute n times
// ifrom 0 to n-1
}
Nested for:
for ( j = 0; j < 10; j++ ) {
for ( i = 0; i < 20; i++ ){
// this code body will execute 200 times
}
}
25. while loops
while(response == 1) {
System.out.print( “ID =” +
userID[n]);
n++;
response = readInt( “Enter “);
}
What is the minimum number of times the loop
is executed?
What is the maximum number of times?
26. do {… } while loops
do {
System.out.print( “ID =” + userID[n] );
n++;
response = readInt( “Enter ” );
}while (response == 1);
What is the minimum number of times the loop
is executed?
What is the maximum number of times?
27. Break
A break statement causes an exit from the
innermost containing while, do, for or
switch statement.
for ( int i = 0; i < maxID, i++ ) {
if ( userID[i] == targetID ) {
index = i;
break;
}
} // program jumps here after break
28. Continue
Can only be used with while, do or for.
The continue statement causes the innermost loop to
start the next iteration immediately
for ( int i = 0; i < maxID; i++ ) {
if ( userID[i] != -1 ) continue;
System.out.print( “UserID ” + i + “ :” +
userID);
}
29. Arrays
Am array is a list of similar things
An array has a fixed:
– name
– type
– length
These must be declared when the array is created.
Arrays sizes cannot be changed during the execution
of the code
30. myArray has room for 8 elements
the elements are accessed by their index
in Java, array indices start at 0
3 6 3 1 6 3 4 1myArray =
0 1 2 3 4 5 6 7
31. Declaring Arrays
int myArray[];
declares myArray to be an array of integers
myArray = new int[8];
sets up 8 integer-sized spaces in memory,
labelled myArray[0] to myArray[7]
int myArray[] = new int[8];
combines the two statements in one line
32. Assigning Values
refer to the array elements by index to store values in
them.
myArray[0] = 3;
myArray[1] = 6;
myArray[2] = 3; ...
can create and initialise in one step:
int myArray[] = {3, 6, 3, 1, 6, 3, 4, 1};
33. Iterating Through Arrays
for loops are useful when dealing with arrays:
for (int i = 0; i <
myArray.length; i++) {
myArray[i] = getsomevalue();
}
34. Arrays of Objects
So far we have looked at an array of primitive types.
– integers
– could also use doubles, floats, characters…
Often want to have an array of objects
– Students, Books, Loans ……
Need to follow 3 steps.
35. Declaring the Array
1. Declare the array
private Student studentList[];
– this declares studentList
2 .Create the array
studentList = new Student[10];
– this sets up 10 spaces in memory that can
hold references to Student objects
3. Create Student objects and add them to the
array: studentList[0] = new
Student("Cathy", "Computing");
37. Classes ARE Object Definitions
OOP - object oriented programming
code built from objects
Java these are called classes
Each class definition is coded in a
separate .java file
Name of the object must match the
class/object name
38. The three principles of OOP
Encapsulation
– Objects hide their
functions (methods) and
data (instance
variables)
Inheritance
– Each subclass inherits
all variables of its
superclass
Polymorphism
– Interface same despite
different data types
car
auto-
matic
manual
Super class
Subclasses
draw() draw()
39. Simple Class and Method
Class Fruit{
int grams;
int cals_per_gram;
int total_calories() {
return(grams*cals_per_gram);
}
}
40. Methods
A method is a named sequence of code that can be
invoked by other Java code.
A method takes some parameters, performs some
computations and then optionally returns a value (or
object).
Methods can be used as part of an expression
statement.
public float convertCelsius(float tempC) {
return( ((tempC * 9.0f) / 5.0f) + 32.0 );
}
41. Method Signatures
A method signature specifies:
– The name of the method.
– The type and name of each parameter.
– The type of the value (or object) returned by the method.
– The checked exceptions thrown by the method.
– Various method modifiers.
– modifiers type name ( parameter list ) [throws exceptions ]
public float convertCelsius (float tCelsius ) {}
public boolean setUserInfo ( int i, int j, String name ) throws
IndexOutOfBoundsException {}
42. Public/private
Methods/data may be declared public or
private meaning they may or may not be
accessed by code in other classes …
Good practice:
– keep data private
– keep most methods private
well-defined interface between classes -
helps to eliminate errors
43. Using objects
Here, code in one class creates an instance
of another class and does something with it
…
Fruit plum=new Fruit();
int cals;
cals = plum.total_calories();
Dot operator allows you to access (public)
data/methods inside Fruit class
44. Constructors
The line
plum = new Fruit();
invokes a constructor method with which you
can set the initial data of an object
You may choose several different type of
constructor with different argument lists
eg Fruit(), Fruit(a) ...
45. Overloading
Can have several versions of a method
in class with different types/numbers of
arguments
Fruit() {grams=50;}
Fruit(a,b) { grams=a; cals_per_gram=b;}
By looking at arguments Java decides
which version to use
46. Java Development Kit
javac - The Java Compiler
java - The Java Interpreter
jdb - The Java Debugger
appletviewer -Tool to run the applets
javap - to print the Java bytecodes
javaprof - Java profiler
javadoc - documentation generator
javah - creates C header files
48. 48
Streams and I/O
basic classes for file IO
– FileInputStream, for reading from a file
– FileOutputStream, for writing to a file
Example:
Open a file "myfile.txt" for reading
FileInputStream fis = new FileInputStream("myfile.txt");
Open a file "outfile.txt" for writing
FileOutputStream fos = new FileOutputStream ("myfile.txt");
49. 49
Display File Contents
import java.io.*;
public class FileToOut1 {
public static void main(String args[]) {
try {
FileInputStream infile = new FileInputStream("testfile.txt");
byte buffer[] = new byte[50];
int nBytesRead;
do {
nBytesRead = infile.read(buffer);
System.out.write(buffer, 0, nBytesRead);
} while (nBytesRead == buffer.length);
}
catch (FileNotFoundException e) {
System.err.println("File not found");
}
catch (IOException e) { System.err.println("Read failed"); }
}
}
50. 50
Filters
•Once a stream (e.g., file) has been opened, we
can attach filters
•Filters make reading/writing more efficient
•Most popular filters:
• For basic types:
•DataInputStream, DataOutputStream
• For objects:
•ObjectInputStream, ObjectOutputStream
51. 51
Writing data to a file using Filters
import java.io.*;
public class GenerateData {
public static void main(String args[]) {
try {
FileOutputStream fos = new FileOutputStream("stuff.dat");
DataOutputStream dos = new DataOutputStream(fos);
dos.writeInt(2);
dos.writeDouble(2.7182818284590451);
dos.writeDouble(3.1415926535);
dos.close(); fos.close();
}
catch (FileNotFoundException e) {
System.err.println("File not found");
}
catch (IOException e) {
System.err.println("Read or write failed");
}
}
}
52. 52
Reading data from a file using filters
import java.io.*;
public class ReadData {
public static void main(String args[]) {
try {
FileInputStream fis = new FileInputStream("stuff.dat");
DataInputStream dis = new DataInputStream(fis);
int n = dis.readInt();
System.out.println(n);
for( int i = 0; i < n; i++ ) { System.out.println(dis.readDouble());
}
dis.close(); fis.close();
}
catch (FileNotFoundException e) {
System.err.println("File not found");
}
catch (IOException e) { System.err.println("Read or write failed");
}
}
}
53. 53
Object serialization
Write objects to a file, instead of writing primitive
types.
Use the ObjectInputStream, ObjectOutputStream
classes, the same way that filters are used.
54. 54
Write an object to a file
import java.io.*;
import java.util.*;
public class WriteDate {
public WriteDate () {
Date d = new Date();
try {
FileOutputStream f = new FileOutputStream("date.ser");
ObjectOutputStream s = new ObjectOutputStream (f);
s.writeObject (d);
s.close ();
}
catch (IOException e) { e.printStackTrace(); }
public static void main (String args[]) {
new WriteDate ();
}
}
55. 55
Read an object from a file
import java.util.*;
public class ReadDate {
public ReadDate () {
Date d = null;
ObjectInputStream s = null;
try { FileInputStream f = new FileInputStream ("date.ser");
s = new ObjectInputStream (f);
} catch (IOException e) { e.printStackTrace(); }
try { d = (Date)s.readObject (); }
catch (ClassNotFoundException e) { e.printStackTrace(); }
catch (InvalidClassException e) { e.printStackTrace(); }
catch (StreamCorruptedException e) { e.printStackTrace(); }
catch (OptionalDataException e) { e.printStackTrace(); }
catch (IOException e) { e.printStackTrace(); }
System.out.println ("Date serialized at: "+ d);
}
public static void main (String args[]) { new ReadDate (); }
}