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Java Jargon - Intro To Java

Java Definition and Meaning

Java is a multi-platform, object-oriented, and network-centric language. It is among the most used programming language. Java is also used as a computing platform.

It is considered as one of the fast, secure, and reliable programming languages preferred by most organizations to build their projects.


What is Java used for?

  • Here are some important Java applications:
  • It is used for developing Android Apps
  • Helps you to create Enterprise Software
  • Wide range of Mobile java Applications
  • Scientific Computing Applications
  • Use for Big Data Analytics
  • Java Programming of Hardware devices
  • Used for Server-Side Technologies like Apache, JBoss, GlassFish, etc.


Java Features

  • Here are some important Java features:
  • It is one of the easy-to-use programming languages to learn.
  • Write code once and run it on almost any computing platform.
  • Java is platform-independent. Some programs developed in one machine can be executed in another machine.
  • It is designed for building object-oriented applications.
  • It is a multithreaded language with automatic memory management.
  • It is created for the distributed environment of the Internet.
  • Facilitates distributed computing as its network-centric


Components of Java Programming Language 

A Java Programmer composes a program in an intelligible language called Source Code. Accordingly, the CPU or Chips never comprehend the source code written in any programming language. 

These PCs or chips see just something single, which is called machine language or code. These machine codes run at the CPU level. In this way, it would be distinctive machine codes for different models of CPU. 

Notwithstanding, you need to stress over the machine code, as writing computer programs is about the source code. The machine comprehends this source code and interprets them into machine justifiable code, which is an executable code. 

This load of functionalities occurs inside the accompanying 3 Java stage parts:

Java Development Kit (JDK)

JDK is a software development environment used for making applets and Java applications. The full form of JDK is Java Development Kit. Java developers can use it on Windows, macOS, Solaris, and Linux. JDK helps them to code and run Java programs. It is possible to install more than one JDK version on the same computer.

Why use JDK?

Here are the main reasons for using JDK:

  • JDK contains tools required to write Java programs and JRE to execute them.
  • It includes a compiler, Java application launcher, Appletviewer, etc.
  • Compiler converts code written in Java into byte code.
  • Java application launcher opens a JRE, loads the necessary class, and executes its main method.

Java Virtual Machine (JVM):

Java Virtual Machine (JVM) is an engine that provides a runtime environment to drive the Java Code or applications. It converts Java bytecode into machine language. JVM is a part of the Java Run Environment (JRE). In other programming languages, the compiler produces machine code for a particular system. However, the Java compiler produces code for a Virtual Machine known as Java Virtual Machine.

Why JVM?

Here are the important reasons for using JVM:

  • JVM provides a platform-independent way of executing Java source code.
  • It has numerous libraries, tools, and frameworks.
  • Once you run a Java program, you can run it on any platform and save lots of time.
  • JVM comes with JIT (Just-in-Time) compiler that converts Java source code into low-level machine language. Hence, it runs faster than a regular application.

Java Runtime Environment (JRE)

JRE is a piece of software that is designed to run other software. It contains the class libraries, loader class, and JVM. In simple terms, if you want to run a Java program, you need JRE. If you are not a programmer, you don't need to install JDK, but just JRE to run Java programs.

Why use JRE?

Here are the main reasons for using JRE:

  • JRE contains class libraries, JVM, and other supporting files. It does not include any tool for Java development like a debugger, compiler, etc.
  • It uses important package classes like math, swing, util, lang, awt, and runtime libraries.
  • If you have to run Java applets, then JRE must be installed in your system.

LINKS:

- Java Tutorial for Beginners: Learn Core Java Programming

- Learn Java Tutorial Book

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