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What Is Java Runtime Environment?

What Is Java Runtime Environment?

Java Runtime Environment (JRE) Is The Software Java Programs Need To Run Correctly.

Java is a computer programming language that many current web, enterprise, and mobile applications are written using. JRE is the underlying technology communicating between the Java application and the operating system.

This software is a translator and facilitator, providing all the resources the applications need.

When you write programs using Java, you can run the program on any operating system without significant code changes.

Why is JRE important?

A software program requires a runtime environment that provides access to memory and other system resources, such as program files and dependencies. In the past, most software used the operating system directly as the runtime environment. The problem with the above method was that the developers had to write different codes for each operating system to run their programs on that operating system. Java Runtime Environment technology was invented as a solution to this problem.

JRE is one of the three critical components of the Java platform, which is required to implement any application based on the Java programming language successfully. Java Development Kit (JDK) and Java Virtual Machine (JVM) are other essential components in this field.

Java development kit

The Java Development Kit (JDK) is a set of software tools that you can use to develop Java applications. Download it and install it in the development environment to benefit from the above kit. In this context, you should pay attention to the correct JDK version compatible with the desired Java version. For example, Java Standard Edition or Java SE requires the JDK.

Java virtual machine

Java Virtual Machine (JVM) is the Java Development Kit software name that executes Java program line by line. Developers configure JVM settings to manage application resources when running a Java application. For example, you can change JVM memory settings and check how much internal memory your Java programs use at runtime.

The role of JRE in the Java programming language

The JRE combines the Java code you create using the JDK with additional built-in code called libraries. It then creates a JVM instance or local copy that runs Java programs. JVMs are available for several operating systems, and the JRE produces a copy of your Java code that can be run on different types of Java virtual machines. In this way, JRE facilitates platform independence for Java applications. More precisely, you can write your applications once and run them anywhere.

What is the difference between JRE, JVM, and JDK?

The JDK is a software layer on top of the JRE that includes a compiler, a debugger, and other tools commonly found in any software development environment. In the JDK, you write code in an English-like manner. The JDK compiles it and passes the bytecode to the JRE. In contrast, the JRE contains class libraries, support files, and the Java Virtual Machine. These software components are used to execute byte code on any device.

How does JRE work?

The Java Development Kit (JDK) and JRE interact to create a stable runtime environment that runs Java program files on any machine. The Java Runtime Environment runs on the operating system and provides additional Java-specific resources. The JRE uses the following three main components for this purpose.

ClassLoader

Bytecode verifier

Interpreter

What are JRE components?

Apart from the main components of the Java Runtime Environment, several other software components help run Java programs more efficiently. Among the essential features in this field, the following should be mentioned:

Development tools

Java 2D

Java 2D is an application programming interface (API) that you can use to draw 2D graphics and create rich user interfaces, games, animations, and special effects in Java.

Swing

Abstract Window Toolkit

Deployment solutions

The JRE includes technologies that simplify releasing software changes to application users. These technologies also provide advanced support for updating applications. Deployment technologies such as Java Web Start and the Java Plugin are included in the JRE installation. These technologies simplify application activation and provide advanced support for future JRE updates. Below are some examples of these tools:

Java Web Start

Java plugin

Language libraries and tools

A collection of Java class files is called a Java package. The JRE contains several Java packages that support versioning, management, and monitoring. Among the essential packages in this field, the following should be mentioned:

Collections framework

Preferences API

The Preferences API allows multiple users on the same machine to define their group based on application preferences.

Logging

Java Archive

Integration libraries

The JRE includes several integration libraries that help developers create seamless data connections between services and applications. Below are some examples of libraries:

Java IDL

Ability to connect to Java database

Developers use Java Database Connectivity (JDBC) to write programs that can access databases, spreadsheets, and remote files.

Java Naming and Directory Interface

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