The document discusses the key features of Java applications. It outlines that Java is compiled and interpreted, platform independent and portable, object oriented, robust and secure, distributed, simple and familiar, multithreaded and interactive, high performance, and dynamic and extensible. Some of the main benefits highlighted include that Java works across operating systems and hardware, is designed for internet use, incorporates security features like memory access verification, and supports concurrent programming.
This presentation provides an overview of the Java programming language. It discusses what Java is, where it is used, its features, how Java programs are translated and run on the Java Virtual Machine. It also covers Java concepts like object-oriented programming, data types in Java, garbage collection, and the development phases of a Java program. Finally, it proposes a project idea of developing an intranet mailing system and concludes by thanking the audience and asking if there are any questions.
The document provides an overview of a presentation on core Java concepts including details about the Encapsulate Logics institute where the presentation will take place, background on Java founder James Gosling, definitions and characteristics of Java, and versions of the Java Development Kit. Key aspects of object-oriented programming such as encapsulation, inheritance, and polymorphism are also explained. The presentation aims to impart programming skills and practical concepts of Java to students.
Rahul Singh presented on Java. Java is a general-purpose, object-oriented programming language that is designed to have as few implementation dependencies as possible so that code can run on any Java virtual machine. Key principles of Java include that it must be simple, robust, architecture-neutral, portable, high-performance, and interpreted/threaded/dynamic. Java has been updated through various versions since its initial release in 1995 and the Java platform allows programs to run similarly on different hardware/operating systems using Java bytecode. Rahul Singh promotes Java training provided by Iteducenter.
JAVA was developed by Sun Microsystems Inc in 1991, later acquired by Oracle Corporation. It was developed by James Gosling and Patrick Naughton. It is a simple programming language. Writing, compiling and debugging a program is easy in java. It helps to create modular programs and reusable code.
The document discusses features and uses of the Java programming language. It provides an overview of Java's core features like being secure, dynamic, object-oriented, interpreted, and portable. It also lists where Java is commonly used, such as in Android apps, web applications, mobile games, and Hadoop. The document then outlines the course contents which covers Java language basics, object-oriented programming, polymorphism, exceptions, generics, streams, concurrency, and data structures. It concludes with contact details for the training organization providing the Java course.
Programming languages allow users to instruct computers to perform tasks. There are two main types: procedural and object-oriented. Procedural languages organize code into procedures that manipulate shared data, while object-oriented languages bundle data and functions into objects to improve security and reuse. Java is an object-oriented language that is portable, platform-independent, and secure. It uses a virtual machine (JVM) to execute programs on any system. JDBC provides an API for Java programs to connect to databases and submit SQL queries.
The document discusses the key features of Java applications. It outlines that Java is compiled and interpreted, platform independent and portable, object oriented, robust and secure, distributed, simple and familiar, multithreaded and interactive, high performance, and dynamic and extensible. Some of the main benefits highlighted include that Java works across operating systems and hardware, is designed for internet use, incorporates security features like memory access verification, and supports concurrent programming.
This presentation provides an overview of the Java programming language. It discusses what Java is, where it is used, its features, how Java programs are translated and run on the Java Virtual Machine. It also covers Java concepts like object-oriented programming, data types in Java, garbage collection, and the development phases of a Java program. Finally, it proposes a project idea of developing an intranet mailing system and concludes by thanking the audience and asking if there are any questions.
The document provides an overview of a presentation on core Java concepts including details about the Encapsulate Logics institute where the presentation will take place, background on Java founder James Gosling, definitions and characteristics of Java, and versions of the Java Development Kit. Key aspects of object-oriented programming such as encapsulation, inheritance, and polymorphism are also explained. The presentation aims to impart programming skills and practical concepts of Java to students.
Rahul Singh presented on Java. Java is a general-purpose, object-oriented programming language that is designed to have as few implementation dependencies as possible so that code can run on any Java virtual machine. Key principles of Java include that it must be simple, robust, architecture-neutral, portable, high-performance, and interpreted/threaded/dynamic. Java has been updated through various versions since its initial release in 1995 and the Java platform allows programs to run similarly on different hardware/operating systems using Java bytecode. Rahul Singh promotes Java training provided by Iteducenter.
JAVA was developed by Sun Microsystems Inc in 1991, later acquired by Oracle Corporation. It was developed by James Gosling and Patrick Naughton. It is a simple programming language. Writing, compiling and debugging a program is easy in java. It helps to create modular programs and reusable code.
The document discusses features and uses of the Java programming language. It provides an overview of Java's core features like being secure, dynamic, object-oriented, interpreted, and portable. It also lists where Java is commonly used, such as in Android apps, web applications, mobile games, and Hadoop. The document then outlines the course contents which covers Java language basics, object-oriented programming, polymorphism, exceptions, generics, streams, concurrency, and data structures. It concludes with contact details for the training organization providing the Java course.
Programming languages allow users to instruct computers to perform tasks. There are two main types: procedural and object-oriented. Procedural languages organize code into procedures that manipulate shared data, while object-oriented languages bundle data and functions into objects to improve security and reuse. Java is an object-oriented language that is portable, platform-independent, and secure. It uses a virtual machine (JVM) to execute programs on any system. JDBC provides an API for Java programs to connect to databases and submit SQL queries.
Java is a set of computer software and specifications developed by James Gosling at Sun Microsystems, which was later acquired by the Oracle Corporation, that provides a system for developing application software and deploying it in a cross-platform computing environment.
The document provides an overview of the Core Java training report. It discusses the history and evolution of Java from earlier languages like C and C++. It describes key Java concepts like data types, variables, tokens, operators, and separators. It also compares features of Java and C++. The document serves as an introduction to the Java programming language.
This document provides an overview of the Java programming language. It discusses Java as both a programming language and platform. Key points include:
- Java is an object-oriented, platform-independent language that is compiled to bytecode that runs on a Java Virtual Machine.
- Java applications, applets, and servlets can be developed. Applets run in web browsers while applications and servlets run on servers.
- Java's features include simplicity, security, reliability, portability and multi-threading capabilities.
- The history of Java's development at Sun Microsystems in the 1990s is summarized, along with its growth in popularity for internet programming.
This document contains information about C-DAC, the history of Java, what Java is, why Java is used, features of Java, the Java code life cycle, and discusses a medical store management project. It describes that C-DAC is an R&D organization of MeitY that carries out IT and electronics R&D. It provides a timeline of Java from 1990 to 2014 and describes Java as an object-oriented language based on C/C++ designed for web/internet applications. It lists reasons for using Java like platform independence and security. It outlines the Java code life cycle of edit, compile, load, and execute phases. It provides functional and tool requirements for a medical store management project the author completed.
Java has many features that make it a popular programming language, including being platform independent, object-oriented, robust, and secure. It is platform independent because Java code is compiled into bytecode that can run on any system with a Java virtual machine. It is object-oriented because it organizes programs around objects that contain both data and behaviors. Java is also robust through features like automatic garbage collection and exception handling. Additionally, it is secure due to features such as lack of pointers, bytecode verification, and a security manager.
Java is a general-purpose computer-programming language that is concurrent, class-based, object-oriented,[15] and specifically designed to have as few implementation dependencies as possible
Introduction to Java Programming Languagejaimefrozr
The document provides an introduction and history of the Java programming language. It discusses that Java was originally developed in 1991 by Sun Microsystems to be portable for consumer electronic devices. The document then summarizes the key capabilities of Java including being a general purpose language that can develop robust applications for desktops, servers, and mobile devices. It also outlines the Java language specifications, application programming interface containing predefined classes, and development tools available. Finally, it explains how Java's use of byte code and the Java Virtual Machine allows it to be highly portable across different operating systems.
This document provides an overview of Java technology presented during a summer training. It discusses what Java is as an object-oriented programming language that runs on any system, as well as object-oriented programming principles like encapsulation, inheritance, and polymorphism. The document also covers why Java is used, its characteristics, use in web applications, core packages, versions of the Java Development Kit, the Java life cycle, a simple Java program example, and a student's text editor project.
Training on Core java | PPT Presentation | Shravan SanidhyaShravan Sanidhya
This document provides an overview of Java training. It defines Java as an object-oriented programming language and platform, describes where Java is used including desktop applications, web applications, and mobile applications. The document also outlines features of Java like being simple, object-oriented, distributed, robust, and secure. It further explains the Java Virtual Machine, includes a basic "Hello World" Java program example, and discusses advantages and disadvantages of Java.
The document provides an overview of Java including its history, naming, versions, uses and types of applications. It notes that Java was originally developed by James Gosling at Sun Microsystems in 1991 under the name "Oak" and was later renamed to "Java". The document also lists the major Java versions released and where Java is commonly used today such as in desktop applications, web applications, enterprise applications and mobile applications.
Java is a programming language designed for use in the distributed environment of the Internet.
Programming language developed for the Web.
Programming language Developed by James Gosling.
Sun Microsystems released java in 1995 as a core component of Sun Java technology.
Java is very versatile, efficient, platform independent and secure.
Java is write once and run anywhere.
This presentation provides an overview of core Java concepts. It introduces Java as a popular programming language due to its portability across platforms. It then outlines the contents to be covered, including what Java is, where it is used, its features, how Java programs are translated and executed, and an overview of the Java system. Key topics like the Java Virtual Machine, object-oriented programming concepts in Java, data types, and garbage collection are explained. The advantages and disadvantages of Java are also presented. Finally, a library management system project built in Java is described as an example.
The main features of java is; It is object oriented programming language. It is also simple and easy to learn. Java is platform independent programming language. These above are main features of java.
https://www.sitesbay.com/java/features-of-java
Java is an object-oriented programming language that is compiled to bytecode that runs on a Java Virtual Machine (JVM), making Java platform-independent. The key frameworks for Java include Spring for dependency injection, Hibernate for object-relational mapping, Struts as a model-view-controller framework, JSF for building user interfaces, and GWT for developing frontend applications in Java.
C,c++,java,php,.net training institute in delhi, best training institute for ...MCM COmpetitive Classes
Java is an object-oriented programming language created by Sun Microsystems. The document provides an overview of Java, including its history, features, uses in different types of applications, and how the Java Virtual Machine works. It also describes CPD Technologies' Java training program, which covers core Java concepts as well as advanced topics like servlets, JSP, EJB, Struts, Hibernate, and live project development.
To review computer basics, programs, and operating systems
To explore the relationship between Java and the World Wide Web
To distinguish the terms API, IDE, and JDK
To write a simple Java program
To display output on the console
To explain the basic syntax of a Java program
To create, compile, and run Java programs
(GUI) To display output using the JOptionPane output dialog boxes
Introduction to Java Programming, Basic Structure, variables Data type, input...Mr. Akaash
This is First Lecture of java Programming which cover all basic points (ie. History and feature of java, Introduction to java, about variables data type and compilation....
In this core java training session, you will learn Elements of Java programming. Topics covered in this session are:
• Quick review of some important concepts from last class
• History of Java
• JDK and JRE
• Byte Code and JVM (Java Virtual Machine)
• Platform Independence
• Principles of Object Oriented Programming
• Writing your first Java Application
• Elements of Java programming language
• Built in Data Types
• Conditional Statements
• Loops
For more information about this course visit on this link: https://www.mindsmapped.com/courses/software-development/learn-java-fundamentals-hands-on-training-on-core-java-concepts/
In this session you will learn:
1. Principles of Object-Oriented Programming
2. Writing your first Java Application
3. Elements of Java programming language
4. Built in Data Types
5. Conditional Statements
6. Loops
This document provides an overview of Java fundamentals including:
- A brief history of Java's development from 1991-1995.
- An explanation of how Java code is compiled to bytecode and run on any machine by a Java Virtual Machine (JVM), making Java platform independent.
- Descriptions of Java applications and applets, the Java Development Kit (JDK), Java Runtime Environment (JRE), and object-oriented programming principles in Java like inheritance and polymorphism.
- Details of Java's features like being compiled and interpreted, platform independent, object-oriented, robust, secure, distributed, and multi-threaded.
- An example of the "Hello World" first Java program.
Java is a set of computer software and specifications developed by James Gosling at Sun Microsystems, which was later acquired by the Oracle Corporation, that provides a system for developing application software and deploying it in a cross-platform computing environment.
The document provides an overview of the Core Java training report. It discusses the history and evolution of Java from earlier languages like C and C++. It describes key Java concepts like data types, variables, tokens, operators, and separators. It also compares features of Java and C++. The document serves as an introduction to the Java programming language.
This document provides an overview of the Java programming language. It discusses Java as both a programming language and platform. Key points include:
- Java is an object-oriented, platform-independent language that is compiled to bytecode that runs on a Java Virtual Machine.
- Java applications, applets, and servlets can be developed. Applets run in web browsers while applications and servlets run on servers.
- Java's features include simplicity, security, reliability, portability and multi-threading capabilities.
- The history of Java's development at Sun Microsystems in the 1990s is summarized, along with its growth in popularity for internet programming.
This document contains information about C-DAC, the history of Java, what Java is, why Java is used, features of Java, the Java code life cycle, and discusses a medical store management project. It describes that C-DAC is an R&D organization of MeitY that carries out IT and electronics R&D. It provides a timeline of Java from 1990 to 2014 and describes Java as an object-oriented language based on C/C++ designed for web/internet applications. It lists reasons for using Java like platform independence and security. It outlines the Java code life cycle of edit, compile, load, and execute phases. It provides functional and tool requirements for a medical store management project the author completed.
Java has many features that make it a popular programming language, including being platform independent, object-oriented, robust, and secure. It is platform independent because Java code is compiled into bytecode that can run on any system with a Java virtual machine. It is object-oriented because it organizes programs around objects that contain both data and behaviors. Java is also robust through features like automatic garbage collection and exception handling. Additionally, it is secure due to features such as lack of pointers, bytecode verification, and a security manager.
Java is a general-purpose computer-programming language that is concurrent, class-based, object-oriented,[15] and specifically designed to have as few implementation dependencies as possible
Introduction to Java Programming Languagejaimefrozr
The document provides an introduction and history of the Java programming language. It discusses that Java was originally developed in 1991 by Sun Microsystems to be portable for consumer electronic devices. The document then summarizes the key capabilities of Java including being a general purpose language that can develop robust applications for desktops, servers, and mobile devices. It also outlines the Java language specifications, application programming interface containing predefined classes, and development tools available. Finally, it explains how Java's use of byte code and the Java Virtual Machine allows it to be highly portable across different operating systems.
This document provides an overview of Java technology presented during a summer training. It discusses what Java is as an object-oriented programming language that runs on any system, as well as object-oriented programming principles like encapsulation, inheritance, and polymorphism. The document also covers why Java is used, its characteristics, use in web applications, core packages, versions of the Java Development Kit, the Java life cycle, a simple Java program example, and a student's text editor project.
Training on Core java | PPT Presentation | Shravan SanidhyaShravan Sanidhya
This document provides an overview of Java training. It defines Java as an object-oriented programming language and platform, describes where Java is used including desktop applications, web applications, and mobile applications. The document also outlines features of Java like being simple, object-oriented, distributed, robust, and secure. It further explains the Java Virtual Machine, includes a basic "Hello World" Java program example, and discusses advantages and disadvantages of Java.
The document provides an overview of Java including its history, naming, versions, uses and types of applications. It notes that Java was originally developed by James Gosling at Sun Microsystems in 1991 under the name "Oak" and was later renamed to "Java". The document also lists the major Java versions released and where Java is commonly used today such as in desktop applications, web applications, enterprise applications and mobile applications.
Java is a programming language designed for use in the distributed environment of the Internet.
Programming language developed for the Web.
Programming language Developed by James Gosling.
Sun Microsystems released java in 1995 as a core component of Sun Java technology.
Java is very versatile, efficient, platform independent and secure.
Java is write once and run anywhere.
This presentation provides an overview of core Java concepts. It introduces Java as a popular programming language due to its portability across platforms. It then outlines the contents to be covered, including what Java is, where it is used, its features, how Java programs are translated and executed, and an overview of the Java system. Key topics like the Java Virtual Machine, object-oriented programming concepts in Java, data types, and garbage collection are explained. The advantages and disadvantages of Java are also presented. Finally, a library management system project built in Java is described as an example.
The main features of java is; It is object oriented programming language. It is also simple and easy to learn. Java is platform independent programming language. These above are main features of java.
https://www.sitesbay.com/java/features-of-java
Java is an object-oriented programming language that is compiled to bytecode that runs on a Java Virtual Machine (JVM), making Java platform-independent. The key frameworks for Java include Spring for dependency injection, Hibernate for object-relational mapping, Struts as a model-view-controller framework, JSF for building user interfaces, and GWT for developing frontend applications in Java.
C,c++,java,php,.net training institute in delhi, best training institute for ...MCM COmpetitive Classes
Java is an object-oriented programming language created by Sun Microsystems. The document provides an overview of Java, including its history, features, uses in different types of applications, and how the Java Virtual Machine works. It also describes CPD Technologies' Java training program, which covers core Java concepts as well as advanced topics like servlets, JSP, EJB, Struts, Hibernate, and live project development.
To review computer basics, programs, and operating systems
To explore the relationship between Java and the World Wide Web
To distinguish the terms API, IDE, and JDK
To write a simple Java program
To display output on the console
To explain the basic syntax of a Java program
To create, compile, and run Java programs
(GUI) To display output using the JOptionPane output dialog boxes
Introduction to Java Programming, Basic Structure, variables Data type, input...Mr. Akaash
This is First Lecture of java Programming which cover all basic points (ie. History and feature of java, Introduction to java, about variables data type and compilation....
In this core java training session, you will learn Elements of Java programming. Topics covered in this session are:
• Quick review of some important concepts from last class
• History of Java
• JDK and JRE
• Byte Code and JVM (Java Virtual Machine)
• Platform Independence
• Principles of Object Oriented Programming
• Writing your first Java Application
• Elements of Java programming language
• Built in Data Types
• Conditional Statements
• Loops
For more information about this course visit on this link: https://www.mindsmapped.com/courses/software-development/learn-java-fundamentals-hands-on-training-on-core-java-concepts/
In this session you will learn:
1. Principles of Object-Oriented Programming
2. Writing your first Java Application
3. Elements of Java programming language
4. Built in Data Types
5. Conditional Statements
6. Loops
This document provides an overview of Java fundamentals including:
- A brief history of Java's development from 1991-1995.
- An explanation of how Java code is compiled to bytecode and run on any machine by a Java Virtual Machine (JVM), making Java platform independent.
- Descriptions of Java applications and applets, the Java Development Kit (JDK), Java Runtime Environment (JRE), and object-oriented programming principles in Java like inheritance and polymorphism.
- Details of Java's features like being compiled and interpreted, platform independent, object-oriented, robust, secure, distributed, and multi-threaded.
- An example of the "Hello World" first Java program.
Java was developed by James Gosling at Sun Microsystems in 1991. It is a popular, object-oriented programming language that is robust, secure, portable, and high-performance. Java code is compiled to bytecode that runs on a Java Virtual Machine, allowing it to run on any platform. The document discusses Java naming conventions, data types, literals, and control statements. It also provides examples of Java code.
This document provides an overview of the Java programming language. It discusses that Java was created in 1995 by James Gosling at Sun Microsystems, originally for television devices but was found to be better suited for internet applications. Java remains popular due to its practicality, backwards compatibility, scalability, platform independence through bytecode, and portability. The document also covers Java editions, a simple Java program example, and key concepts like classes, methods, and the main method.
Introduction to Java : Feature to Java, Java Virtual Machine, Differences between C++ and Java,
Part of Java, API Document, Starting a Java Program. Important Classes, Formatting the Output
The document provides an introduction to Java programming including:
- Java is an object-oriented language where programs are written as classes and allows "write once, run anywhere" functionality.
- Key features of Java include being simple, robust, secure, multi-threaded, and dynamically flexible.
- The Java architecture includes the compiler, JVM, JRE and JDK which work together to compile and execute Java code.
- Common Java applications include mobile apps, desktop apps, web apps, games, cloud apps, and IoT apps.
- A basic Java program structure includes documentation, packages, imports, classes, and a main method.
This document provides an overview of a presentation on Java fundamentals by Kunal V. Gadhi. It covers topics such as the history and features of Java, object-oriented programming concepts, Java applications and applets, multithreading, input/output and networking, MySQL, and JDBC. The document includes sections on each topic with descriptions of key concepts and code examples.
AliExpress’ Way to Microservices - microXchg 2017juvenxu
AliExpress has transitioned to a microservices architecture from a monolithic architecture. This involved several key changes:
1. Organizing code into individual services rather than global jars to improve independence and reusability.
2. Adopting Docker to standardize environments and dependencies.
3. Integrating Alibaba cloud services like configuration (Diamond) and messaging (MetaQ) into applications using Spring starters to simplify usage.
4. Establishing practices like publishing clean API-focused jars, using Maven to manage dependencies, and applying naming standards to improve maintainability at scale.
The document contains notes on Java programming concepts from Unit 1. It defines key terms like platform, Java platform, Java Virtual Machine (JVM), and Java Application Programming Interface (API). It also discusses features of the Java language like being object-oriented, robust, portable, and platform independent. The notes provide examples of Java applications and applets and explain why Java is important for internet programming. It also lists differences between Java and C, describes components of the Java Development Kit (JDK), and covers data types and variables in Java.
This document provides an overview of Java fundamentals including its history, key components like the JDK and JRE, how bytecode and the JVM enable platform independence, and core object-oriented programming principles. It describes how Java was created in the early 1990s to control consumer devices, the development of applets for web browsers, and how bytecode compilation allows the same code to run on any device with a Java Virtual Machine.
project developed on Banking with concepts of core Java and MySQL also how to use Java JDBC to connect to MySQL and perform SQL queries, database inserts and deletes.
MODULE_1_The History and Evolution of Java.pptxVeerannaKotagi1
1). Java was created in 1991 by James Gosling and others at Sun Microsystems to be a portable, platform-independent language for the internet. It took 18 months to develop the first working version.
2). Java applets allowed small programs to be downloaded and run securely in web browsers, while servlets extended server functionality dynamically. Bytecode enabled portability across platforms.
3). Object-oriented programming is central to Java. Key principles include encapsulation, inheritance, and polymorphism. Classes define structure and behavior for objects.
This document provides information about Codename One, a mobile application development framework that allows writing code once and deploying to multiple platforms. It discusses Codename One's mission to unify mobile development, how it works using build servers and lightweight components, and how to install and use it with NetBeans or Eclipse. Key aspects covered include themes, styles, components, layouts, and the GUI builder tool.
Java is an object-oriented programming language that is platform independent. It was developed by Sun Microsystems, now owned by Oracle. Java code is compiled into bytecode that runs on a Java Virtual Machine (JVM), allowing it to run on any device that supports a JVM. Java supports features like inheritance, polymorphism, and encapsulation. It is widely used for client-side applications like applets and server-side applications like servlets and Java Server Pages (JSP). The main Java editions are Java SE for desktop applications, Java EE for enterprise applications, and Java ME for mobile applications.
Java is an object-oriented programming language that is platform independent. It was developed by Sun Microsystems, now owned by Oracle. Java code is compiled into bytecode that runs on a Java Virtual Machine (JVM), allowing it to run on any device with a JVM. Java supports features like inheritance, polymorphism, and encapsulation. It is widely used for client-side applications like applets and server-side applications like servlets and Java Server Pages (JSP). The main Java editions are Java SE for desktop applications, Java EE for enterprise applications, and Java ME for mobile applications.
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React.js, a JavaScript library developed by Facebook, has gained immense popularity for building user interfaces, especially for single-page applications. Over the years, React has evolved and expanded its capabilities, becoming a preferred choice for mobile app development. This article will explore why React.js is an excellent choice for the Best Mobile App development company in Noida.
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About the event
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Superpower Your Apache Kafka Applications Development with Complementary Open...Paul Brebner
Kafka Summit talk (Bangalore, India, May 2, 2024, https://events.bizzabo.com/573863/agenda/session/1300469 )
Many Apache Kafka use cases take advantage of Kafka’s ability to integrate multiple heterogeneous systems for stream processing and real-time machine learning scenarios. But Kafka also exists in a rich ecosystem of related but complementary stream processing technologies and tools, particularly from the open-source community. In this talk, we’ll take you on a tour of a selection of complementary tools that can make Kafka even more powerful. We’ll focus on tools for stream processing and querying, streaming machine learning, stream visibility and observation, stream meta-data, stream visualisation, stream development including testing and the use of Generative AI and LLMs, and stream performance and scalability. By the end you will have a good idea of the types of Kafka “superhero” tools that exist, which are my favourites (and what superpowers they have), and how they combine to save your Kafka applications development universe from swamploads of data stagnation monsters!
2. INTRODUCTION TO JAVA
1. IN 1991 JAMES GOSLING (PROJECT LEADER) WANTS TO DEVELOP A
SOFTWARE WHICH IS USED IN TV REMOTES, MICRO WOVENS,
REFRIGIRATORS.
2. JAMES GOSLING FIRST SELECTED 'C++' LANGUAGE TO DEVELOP THAT
SOFTWARE. AFTER SOME DEVELOPMENT, HE FINDS SOME PROBLEMS TO
DEVELOP SOFTWARE IN 'C++'.
3. THE PROBLEMS ARE POINTERS AND OPERATOR OVERLOADING. THE
MAIN PROBLEM BY USING C++ IS THAT IS SYSTEM DEPENDENT.
4. THEN HE WANTS FIRST TO DEVELOP A NEW LANGUAGE WHICH IS
SIMILAR TO C++, WHICH ELIMINATES POINTERS AND OPERATOR
OVERLOADING AND DIFFICULT TOPICS IN 'C++' LANGUAGE AND WHICH
IS SYSTEM INDEPENDENT.
5. THEN HE DEVELOPS NEW LANGUAGE CALLED "OAK" (TREE NAME). BUT
THE NAME IS ALREADY REGISTERED IN SOFTWARE INDUSTRY. SO IT WAS
RENAMED AS JAVA (COFFE) IN 1995.
6. AFTER SOME MODIFICATIONS FINALLY JAVA WAS DEVELOPED BY SUN
MICRO SYSTEMS OF USA.
4. 'C', C++ Vs JAVA
1. C, C++ ARE CALLED PLATFORM DEPENDENT
LANGUAGES. BECAUSE THESE LANGUAGES
PRODUCES EXECUATABLE FILES. THESE EXECUTABLE
FILES EXECUTES ONLY ON PARTICULAR PLAFORM
(OPERATING SYSTEM).
2. AFTER COMPILING JAVA PRODUCES CLASS FILE
WHICH CONTAINS BYTE CODES. THESE BYTE CODES
ARE INTERMEDIATE CODE, WHICH IS NOT RELATED
TO ANY OPERATING SYSTEM. BUT EXECUTES ON ANY
OPERATING SYSTEM WITH THE HELP OF JVM (JAVA
VIRTUAL MACHINE).
3. JVM IS THE INTERPRETER FOR BYTE CODES. JVM
CONVERTS THE BYTE CODES INTO APPROPRIATE
OPERATING SYSTEM INSTRUCTIONS.
4. THE SLOGAN OF JAVA IS "WRITE ONCE, RUN
ANYWHERE (WORA)".
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5. EDITIONS OF JAVA
1) J2SE (JAVA 2 STANDARD EDITION)
2) J2EE (JAVA 2 ENTERPRISE EDITION)
3) J2ME (JAVA 2 MICRO / MOBILE EDITION)
• J2SE :- IT DEALS WITH DEVELOPING STANDALONE APPLICATIONS,
FUNDAMENTAL APPLICATIONS FOR A NETWORK.
• J2EE :- IT DEALS WITH DEVELOPING BUSINESS SOLUTIONS ON
INTERNET.
• J2ME :- IT DEALS WITH DEVELOPING EMBEDDED SYSTEMS AND
WIRELESS APPLICATIONS.
• EMBEDDED SYSTEMS :- STORING PROGRAMS IN HARDWARE OR
CHIP. USING EMBEDDED SYSTEMS WE CAN WRITE PROGRAMS
DIRECTLY IN CHIPS.
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6. FEATURES OF JAVA
1.SIMPLE :- JAVA IS A SIMPLE PROGRAMMING LANGUAGE. LEARNING JAVA
IS EASY. BECAUSE ALMOST JAVA SYNTAX IS SIMILAR TO 'C' AND 'C++'.
DIFFICULT TOPICS ARE ELIMINATED IN JAVA LIKE POINTERS AND
OPERATOR OVERLOADING. THE FOLLOWING TOPICS ARE ALSO
ELIMINATED FROM JAVA. (GOTO, TYPEDEF, SIZEOF, UNSIGNED INTEGER,
STRUCTURES, UNIONS, HEADER FILES, MULTIPLE INHERITANCE).
2.WHY POINTERS ARE ELIMINATED FROM JAVA ?
1) POINTERS LEAD TO CONFUSION TO THE JAVA PROGRAMMER.
2) POINTERS CRASH A PROGRAM EASILY.
3) USING POINTERS HARMFUL PROGRAMS LIKE VIRUS AND HACKING
PROGRAMS CAN BE DEVELOPED.
3.OBJECT ORIENTED :- JAVA IS PURELY OBJECT ORIENTED LANGUAGE.
WHEREAS C++ IS NOT PURELY OBJECT ORIENTED LANGUAGE. ANOTHER
EXAMPLE FOR PURELY OBJECT ORIENTED LANGUAGE IS SMALL TALK.
OBJECT :- REAL THINGS THAT WE CAN SEE AND TOUCH ARE CALLED
OBJECTS. AN OBJECT IS ANYTHING THAT EXISTS PHYSICALLY IN THE
WORLD. AN OBJECT CAN PERFORM ACTIVITIES.
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7. • IN PROGRAMMING LANGUAGES, OBJECTS ARE INSTANCES (VARIABLES)
OF CLASSES. AN OBJECT CONTAINS PROPERTIES (VARIABLES) AND
ACTIONS (METHODS).
– METHOD :- IT IS NOTHING BUT A FUNCTION. BUT COMPARING WITH
FUNCTION THE DIFFERENCE IS, IT MUST BE WRITEN INSIDE A CLASS. WE
DON'T HAVE FUNCTIONS IN JAVA, ONLY METHODS ARE THERE.
– CLASS :- A CLASS IS A MODEL OR BLUE PRINT FOR CREATING OBJECTS. A
CLASS IS A GROUP NAME GIVEN TO OBJECTS. IT SPECIFIES THE PROPERTIES
AND ACTIONS OF OBJECTS.
• IN PROGRAMMING LANGUAGES, A CLASS IS AN USER-DEFINED DATA
TYPE. BY USING CLASS CONCEPT WE CAN CREATE NEW DATA TYPES.
• IN C++, WITHOUT USING CLASS WE CAN WRITE A PROGRAM. SO IT IS
NOT A PURELY OBJECT ORIENTED. IN JAVA, WE MUST WRITE ATLEAST
ONE CLASS TO PERFORM ANYTHING.
4.DISTRIBUTED :- USING JAVA WE CAN DEVELOP NETWORK APPLICATIONS.
NETWORK APPLICATION IS USED BY ALL SYSTEMS IN THAT NETWORK.
DISTRIBUTED APPLICATION MEANS, IT CAN ACCESS INFORMATION
FROM MULTIPLE SYSTEMS AT A TIME. USING JAVA, WE CAN DEVELOP
DISTRIBUTED APPLICATION.
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8. 5.ROBUST (STRONG / UNBREAKABLE) :- JAVA PROGRAMS WILL NOT CRASH EASILY.
BECAUSE OF ITS MEMORY MANAGEMENT AND EXCEPTION HANDLING
FEATURES, WE CAN WRITE BREAK FREE PROGRAMS. GENERALLY PROGRAMS
ARE BREAK DUE TO MEMORY INSUFFICIENCE. IN JAVA, MEMORY IS ALLOTED BY
JVM'S CLASS LOADER SUB SYSTEM AND DEALLOCATION IS DONE BY JVM'S
GARBAGE COLLECTOR.
6.GARBAGE COLLECTOR :- IT REMOVES UNUSED VARIABLES & OBJECTS FROM THE
MEMORY. THIS MEMORY CAN BE USED BY ANOTHER VARIABLES OR OBJECTS.
7.SECURE :- JAVA IS A SECURE LANGUAGE BECAUSE JAVA CONTAINS FILEWALLS.
FILEWALLS STRICTLY CHECKS EVERYTHING BEFORE DOWNLOADING INTO OUR
SYSTEM. JAVA ENABLES THE CONSTRUCTION OF VIRUS FREE APPLICATIONS.
8.ARCHITECURE NEUTRAL :- JAVA'S BYTE CODE IS NOT MACHINE DEPENDENT. IT
CAN RUN ON ANY MACHINE WITH ANY PROCESSOR AND ANY OPERATING
SYSTEM.
9.PORTABLITY :- JAVA PROGRAMS GIVE SAME RESULTS ON ALL MACHINES.
10.INTERPRETED :- JAVA PROGRAMS ARE COMPILED TO GENERATED THE BYTE
CODE. THIS BYTE CODE CAN BE DOWNLOADED AND IS EXECUTED BY THE
INTERPRETER. BOTH COMPILER AND INTERPRETER PRESENT IN JAVA.
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10. 11.HIGH PERFORMANCE :- ALONG WITH INTERPRETER, THERE WILL BE A JIT (JUST IN
TIME) COMPILER, WHICH ENHANCES THE SPEED OF EXECUTION. SO THAT BOTH
COMPILER AND INTERPRETER RUN THE PROGRAM SIMULTANEOUSLY.
CLASS LOADER SUB SYSTEM WILL LOAD THE CLASS FILE INTO THE MEMORY. AFTER
LOADING IT WILL SEND THAT FILE TO BYTE CODE VERIFIER. IT VERIFIES THE BYTE
CODE INSTRUCTIONS. IF THERE FINDS SOME CODE IT IS NOT BYTE CODE, THEN IT
WILL COMMUNICATE WITH SECURITY MANAGER. THEN SECURITY MANAGER
TELLS THE BYTE CODE VERIFIER TO REJECT THE VIRUS CODE.
SECURITY MANAGER :- IT IS A PROGRAM WHICH IMPLEMENTS THE SECURITY POLICY
AND PROVIDES SECURITY FOR SYSTEM.AFTER VERIFYING THE BYTE CODE IS
GIVEN TO INTERPRETER AND JIT COMPILER SIMULTANOUSLY.
HOTSPOT :- BLOCK OF CODE ALLOTED FOR THE JIT COMPILER FOR INCREASING THE
SPEED OF EXECUTION. INDIVIDUAL STATEMENTS ALLOTED TO INTERPRETER.
INTERPRETER AND JIT COMPILER WORKS SIMALTUEOUNASLY
MEMORY AREAS :- AFTER VERIFYING THE BYTE CODES CLASS LOADER SUB SYSTEM
WILL ALLOT THE MEMORY REQUIRED BY THE JVM. THIS MEMORY IS DIVIDED
INTO FIVE PARTS CALLED RUNTIME DATA AREAS.
• NATIVE MEHOD STACKS AREA :- NATIVE METHODS ARE EXECUTED IN THIS AREA.
• NATIVE METHODS :- METHODS WRITTEN IN OTHER LANGUAGE LIKE C AND C++.Sai NagaVenkata BuchiBabu Manepalli
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11. 12.MULTI THREADED :- THREAD MEANS PROCESS OR EXECUTION. EXECUTING
DIFFERENT PARTS OF A PROGRAM SIMULTANEOUSLY IS CALLED MULTITHREADING.
THIS IS AN ESSENTIAL FEATURE TO DESIGN SERVER SIDE PROGRAMS.
13.DYNAMIC :- WE CAN DEVELOP PROGRAMS IN JAVA WHICH DYNAMICALLY INTERACT
WITH THE USER ON INTERNET.
14.COMMENTS :- COMMENTS ARE USED TO WRITE AIM OF THE PROGRAM. THESE ARE
ALSO USED TO WRITE REFERENCES. THE MAIN ADVANTAGE OF COMMENTS IS
READABILITY (UNDERSTANDABLE). THESE ARE NOT EXECUTABLE STATEMENTS.
JAVA SUPPORTS THREE TYPES OF COMMENTS.
1) SINGLE LINE COMMENT :- WHICH STARTS WITH // AND NEED NOT TO END.
2) MULTI LINE COMMENT :- WHICH STARTS WITH /* AND ENDS WITH */
3) DOCUMENTAION COMMENT :- WHICH STARTS WITH /** AND ENDS WITH */.
THESE COMMENTS ARE USEFUL TO CONVERT A JAVA PROGRAM INTO A HTML
DOCUMENT THAT CONTAINS DESCRIPTION OF JAVA PROGRAM FEATURES. THAT
CONVERTED HTML DOCUMENT IS CALLED API (APPLICATION PROGRAM
INTERFACE) DOCUMENT.
15.API DOCUMENT :- IT IS A HTML FILE THAT CONTAINS DESCRIPTION OF ALL THE
FEATURES OF A SOFTWARE. Sai NagaVenkata BuchiBabu Manepalli
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12. TOOLS OF JDK (JAVA DEVELOPMENT KIT)
• JAVAC (COMPILER):- IT IS USED TO CONVERT JAVA PROGRAM INTO CLASS
FILE WHICH CONTAINS BYTE CODES.
• JAVA (INTERPRETER) :- IT IS USED TO EXECUTE CLASS FILE MEANS BYTE
CODES.
• JAVAP (PROFILER COMPILER) :- IT IS USED TO CONVERT CLASS FILE INTO
JAVA PROGRAM. IT GIVES ONLY STRUCTURE OF THE JAVA PROGRAM. IF
WE USE "JAD" UTILITY WE GET ENTIRE JAVA PROGRAM FROM CLASS
FILE.
• JAVAH (HEADER FILE COMPILER) :- IT IS USED TO INCLUDE NATIVE
METHODS, HEADER FILES INTO JAVA PROGRAM.
• JAVADOC (DOCUMENTATION COMPILER) :- IT IS USED TO CONVERT JAVA
PROGRAM INTO HTML DOCUMENT. THE GENERATED HTML DOCUMENT
IS CALLED API DOCUMENT.
• APPLETVIEWER :- IT IS USED TO EXECUTE APPLETS (SMALL WEB
PROGRAMS).
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13. • METHOD :- SET OF STATEMENTS.
• CLASS / INTERFACE :- SET OF METHODS.
• PACKAGE :- SET OF CLASSES & INTERFACES.
• JSL (JAVA STANDARD LIBRARY) :- SET OF PACKAGES.
• JRE (JAVA RUNTIME ENVIRONMENT) : JVM + JSL.
• STANDALONE APPLICATIONS :- THESE ARE GENERAL PROGRAMS
WHICH ARE NOT RELATED TO INTERNET. THESE APPLICATIONS ARE
EXECUTED BY JAVA INTERPRETER (JAVA TOOL). THESE APPLICATIONS
CONTAINS MAIN( ) METHOD. SO PROGRAM EXECUTION STARTS
FROM MAIN( ) METHOD.
• APPLETS :- THESE ARE SMALL WEB PROGRAMS. APPLETS ARE
EXECUTED BY WEB BROWSER (INTERNET EXPLORER, MOZILLA
FIREFOX, GOOGLE CHROME) OR APPLETVIEWER TOOL. BECAUSE
THESE APPLICATIONS DON'T HAVE MAIN( ) METHOD.Sai NagaVenkata BuchiBabu Manepalli
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14. A SAMPLE PROGRAM
// First.java
class First
{
public static void main(String args[ ])
{
System.out.print("Welcome to Java Programming by Sai Butchi ");
}
}
OUTPUT
========
Welcome to Java Programming by Sai Butchi
Note :- THE ABOVE PROGRAM MUST BE SAVED AS "First.java". BECUASE
CLASS NAME AND FILE NAME MUST BE SAME. IN JAVA ALL CLASS
NAMES MUST START WITH UPPER CASE ALPHABET.Sai NagaVenkata BuchiBabu Manepalli
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15. • IDE :- IT STANDS FOR INTEGRATED DEVELOPMENT ENVIRONEMNT, WHICH ALLOWS TO WRITE,
SAVE, COMPILE, DEBUG AND EXECUTE A PROGRAM. UPTO JAVA 1.5 THERE IS NOT IDE
AVAILABLE FOR JAVA. FROM JAVA 1.6 NET BEANS (IDE) IS AVAILABLE FOR JAVA. ECLIPSE IS THE
FAMOUS IDE FOR JAVA.
• EDITOR :- WHICH IS USED TO ADD, MODIFY AND REMOVE TEXT. THE FAMOUS EDITOR FOR
MS-DOS IS "edit" AND WINDOWS IS "notepad".
• Steps to Run with out Environment Veriables In Windows:
1. START ====> RUN (CMD / COMMAND)
2. C:WINDOWS> cd
3. C:> cd program files
4. C:PROGRAM FILES> cd java
5. C:PROGRAM FILESJAVA> dir
6. C:PROGRAM FILESJAVA> cd jdk1.5.0
7. C:PROGRAM FILESJAVAJDK1.5.0> cd bin
8. C:PROGRAM FILESJAVAJDK1.5.0BIN>
9. edit First.java / Notepad First.java
• WRITE PROGRAM
• SAVE & EXIT Sai NagaVenkata BuchiBabu Manepalli
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16. • COMPILE PROGRAM : javac First.java
• EXECUTE PROGRAM : java First
• System.out :- SYSTEM IS A CLASS AND OUT IT A DATA MEMBER(VARIABLE). IT
REFERS TO MONITOR. PRINT( ) IS A METHOD (FUNCTION) OF SYSTEM CLASS.
IT IS USED TO DISPLAY INFORMATION ON THE SCREEN.
• PUBLIC :- MAIN( ) IS CALLED OUTSIDE THE CLASS. SO IT IS DECLARED AS
PUBLIC. PUBLIC MEMBERS CAN ACCESS FROM ANYWHERE.
• STATIC :- GENERALLY ANY METHOD IS CALLED BY USING AN OBJECT. A STATIC
METHOD IS A METHOD WHICH IS CALLED WITHOUT CREATING AN OBJECT
THROUGH CLASS.
• VOID :- MAIN( ) DOES NOT RETURN ANY VALUE.
• STRING ARGS[] :- ARGS IS AN ARRAY OF STRING DATA TYPE. ARGS STORES
COMMAND LINE ARGUMENTS.
• MAIN,PRINT & PRINTLN METHODS
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Editor's Notes
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