JVM vs JRE vs JDK

Introduction

In java development, the terms “JVM,” “JRE,” and “JDK” might be confusing. These acronyms are essential to understanding Java’s structure and how it works, so let’s take a closer look at each of them.

JVM (Java Virtual Machine):

The Java Virtual Machine (JVM) is an essential part of Java’s architecture. It is an abstract machine that provides a runtime environment in which Java bytecode can be executed. Java bytecode is a platform-independent language that can run on any device that has a JVM. When you compile Java code, it is converted into bytecode, which is executed by the JVM. The JVM also provides other features, such as memory management, garbage collection, and security.

JRE (Java Runtime Environment):

The Java Runtime Environment (JRE) is a subset of the JDK (Java Development Kit). It contains everything necessary to run a Java application, including the JVM, class libraries, and other supporting files. In other words, the JRE is a software package that provides a runtime environment for Java applications. If you only want to run Java applications, you can install the JRE without the JDK.

JDK (Java Development Kit):

The Java Development Kit (JDK) is a software development kit that includes everything you need to develop Java applications. It contains the JRE, the JVM, and other tools, such as the Java compiler, debugger, and documentation. The JDK is necessary if you want to develop Java applications.

So, to summarize:

The JVM is an abstract machine that provides a runtime environment for Java bytecode. The JRE is a subset of the JDK that provides a runtime environment for Java applications. The JDK is a software development kit that includes everything necessary to develop Java applications, including the JRE and JVM. In conclusion, the JVM, JRE, and JDK are all essential parts of Java’s architecture. Understanding the differences between them is essential for anyone developing or running Java applications.