Java is one of the most popular programming languages in the world. It has been around for over two decades and has evolved a lot over the years. However, the terms JDK, JRE, and JVM are often used interchangeably, causing confusion among developers and enthusiasts alike. In this article, we’ll break down the difference between JDK, JRE, and JVM.
What is JDK?
JDK stands for Java Development Kit. It is a software development kit used by developers to write and compile Java programs. The JDK contains a set of tools and libraries that allow developers to create, compile, and test Java applications. The JDK also includes the Java Runtime Environment (JRE), which is used to run Java applications on the target system.
What is JRE?
JRE stands for Java Runtime Environment. It is a runtime environment used to run Java applications. The JRE contains the Java Virtual Machine (JVM) and the Java class libraries, which are required to run Java applications. The JRE does not include any development tools, so it cannot be used to create or compile Java programs.
What is JVM?
JVM stands for Java Virtual Machine. It is an abstract machine that provides a runtime environment for Java programs. The JVM interprets compiled Java code and executes it on the target system. The JVM is responsible for memory management, garbage collection, and security of the Java program. There are different implementations of the JVM, such as HotSpot, JRockit, and OpenJ9.
Now that we have defined the three terms, let’s dive deeper into their differences.
JDK vs JRE
The main difference between JDK and JRE is that the JDK is used for developing Java applications, while the JRE is used for running Java applications. The JDK contains a compiler and other tools required for development, while the JRE only contains the runtime environment.
In other words, if you want to develop Java applications, you need the JDK installed on your system. If you only want to run Java applications, you can install the JRE.
JRE vs JVM
The JRE includes the JVM, so the main difference between them is that the JRE is a complete environment for running Java applications, while the JVM is only a component of the JRE.
The JVM is responsible for executing the Java code, while the JRE provides the runtime environment and the class libraries required by the JVM.
JDK vs JVM
The JDK includes both the JRE and the JVM. In other words, the JDK is a superset of the JRE and the JVM. The JDK contains all the tools and libraries required for developing, compiling, and running Java applications.
Conclusion
In summary, JDK, JRE, and JVM are three different components of the Java platform. The JDK is used for developing Java applications, the JRE is used for running Java applications, and the JVM provides the runtime environment for Java programs. Understanding the difference between these terms is essential for any Java developer or enthusiast.
