Meanings?

• JDK stands for Java Development Kit
• JRE stands for Java Runtime Environment
• JVM stands for Java Virtual Machine
• And javac is used to compile a Java program

Watch this video for a hands-on explanation and deeper insights:

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How JDK, JRE and JVM are related to each other?

JDK?

• JDK stands for Java Development Kit
• JDK provides all the necessary tools to work with the .java file
• JDK -> JRE, JVM

JRE?

• We need to run the compiled code of Java
• abc.class file needs to be converted in m/c instructions
• JRE = JVM + Java Packages Classes (like util, math, lang, awt, swing, etc) + runtime libraries. (JRE = JVM + rt.jar)

JVM?

• The Java Virtual Machine (JVM) is an abstract machine that provides a runtime environment for executing Java bytecode. It first converts the bytecode into machine code instructions, which are then executed by the CPU.
• It converts Java bytecode into machine language instructions.

javac?

• javac is required to compile a Java program.
• It generates byte code from a Java file.
• This byte code file is written in bytes which independently works on all types of JVM machines.

> javac SampleProgram.java
> java SampleProgram