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JAVA ENVIRONMENT

The document explains the three key components of Java: JDK (Java Development Kit), JRE (Java Runtime Environment), and JVM (Java Virtual Machine). It details their respective roles, with JDK providing development tools, JRE serving as a runtime environment with necessary libraries, and JVM converting Java bytecode into machine language. Understanding their interactions is crucial for developers, particularly in cloud and DevOps contexts.

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Three Components • JDK - Java Development Kit • JVM – Java Virtual Machine • JRE – Java Runtime Environment
JDK • Writing Java applets and applications needs development tools like JDK. • Java developers are initially presented with two JDK tools, java and javac. • Both are run from the command prompt. • It's easy for both new and experienced programmers to get started.
JDK Architecture
JRE • JRE is an acronym for Java Runtime Environment. • It is also written as Java RTE. • The Java Runtime Environment is a set of software tools • It physically exists. • It contains a set of libraries + other files that JVM uses at runtime.
JRE Architecture
JVM • JVM is a engine that provides runtime environment to drive the Java Code or applications. • It converts Java byte code into machines language. • Java compiler produces code for a Virtual Machine known as Java Virtual Machine.
JVM Architecture
USES of JDK, JRE, JVM • The Java Virtual Machine is built right into your Java software download, and helps run Java applications. • The JRE allows applets written in the Java programming language to run inside various browsers.
JVM Performance Loads Code Verifies Code Executes code Runtime Environment
JVM WORKS Verifying Code Lining code Reading Code
Types of JVM Java Hot Spot Client VM Java Hot spot Server VM
Difference Between JDK, JRE, JVM
CONCLUSION • The Java Runtime Environment is the on-disk program that loads Java applications for the JVM to execute. • It's helpful to understand how the JVM, JDK and JRE interact, especially for working in cloud and devops environments. • Also used for Development Applications.
JAVA ENVIRONMENT