👨💻Difference Between JDK, JRE, and JVM
Introduction
Hi, In this article, we will discuss the differences between these components and their roles in Java development. Java is a widely used programming language for developing software applications. To develop and run Java applications, three core components are essential: Java Development Kit (JDK), Java Runtime Environment (JRE), and Java Virtual Machine (JVM).
Java Development Kit (JDK)🛠️👨💻
JDK is a software development environment used to develop Java applications. It includes a set of programming tools such as Java compiler, Java runtime environment, and APIs (Application Programming Interfaces) that developers use to create Java applications. JDK also includes other development tools like Javadoc, which is used to generate documentation for Java code.
The JDK provides the necessary tools to compile, debug, and execute Java code. The Java compiler is used to compile Java code into bytecode, which is executed by the JVM. JDK is available for download for different operating systems such as Windows, Linux, and macOS.
Java Runtime Environment (JRE)🧑💻
JRE is a software environment used to run Java applications. It includes the JVM, class libraries, and other files required to run Java applications. JRE does not include the Java compiler, which is only available in the JDK.
When a user installs a Java application, the JRE is required to run the application. JRE is available for download for different operating systems such as Windows, Linux, and macOS.
Java Virtual Machine (JVM)🤖📝
JVM is a software engine that executes Java bytecode. JVM provides a platform-independent environment for executing Java code. It converts Java bytecode into machine-specific instructions that can be executed by the underlying hardware. JVM is available for different operating systems such as Windows, Linux, and macOS.
The JVM provides several benefits, such as portability, security, and memory management. It ensures that Java applications can run on any platform without the need for recompilation. It also provides a secure environment for executing Java code, preventing malicious code from accessing system resources. Additionally, JVM provides automatic memory management, making it easier for developers to manage memory in their Java applications.
Differences between JDK, JRE, and JVM❓🤷♂️
JDK, JRE, and JVM are different components of the Java development and execution environment. Here are some of the differences between these components:
- JDK includes the Java compiler, JRE, and other development tools, while JRE only includes the JVM and class libraries.
- JDK is used to develop Java applications, while JRE is used to run Java applications.
- JVM is a software engine that executes Java bytecode, while JDK and JRE are software environments that include the JVM.
- JDK and JRE are platform-dependent, while JVM is platform-independent.
- JDK is larger in size than JRE, as it includes development tools.
- JRE is required to run Java applications, while JDK is only required for Java development.
For Example🧐
We can discuss the roles of JDK, JRE, and JVM in the process of developing and running a Java application as an example.
During the development phase of Java applications, JDK is used. For example, when a software developer wants to create a Java application, they will first write Java code using a code editor and then compile that code. When the code is compiled, a bytecode file will be generated. This bytecode file will be transformed into an executable format by the JVM.
To do this, the Java compiler in the JDK will be used to create the bytecode file. Additionally, the JDK provides developers with other tools, such as the Java Documentation Tool, Java Debugging Tool, and others.
When the Java application is ready, JRE is used. JRE includes JVM and class libraries. JRE is necessary to execute the JVM and run the application. For example, when a user wants to run a Java application, they must first install JRE on their system. Then, the JVM in JRE will run the bytecode file and execute the Java application.
Finally, JVM is used to execute Java bytecode. JVM is platform-independent, so Java applications can be run on different operating systems. JVM loads and runs the libraries required to execute bytecode. This allows the Java application to run smoothly on different platforms thanks to the JVM.
These examples explain the different roles and uses of JDK, JRE, and JVM.
Conclusion🍾
In summary, JDK, JRE, and JVM are three core components of the Java development and execution environment. JDK is used to develop Java applications, JRE is used to run Java applications, and JVM is a software engine that executes Java bytecode. While JDK and JRE are platform-dependent, JVM is platform-independent. Understanding the differences between these components is essential for Java developers to develop and run Java applications effectively.
See you later👋
