The Java Environment #rowcoder

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The Java Environment 

We know that java have a JVM(Java virtual machine).

• JVM is used to convert Bytecode into machine code(0 and 1).
• JVM contain Interpreter/JIT(just-in-time) to convert Bytecode into microprocessor to specific machine language instruction(machine code).

• Instruction set vary from microprocessor to microprocessor, there exist different JVMs for different platform . Thus, JVM can run any Java program.

• JVM themselves are not portable(machine independent).

=> JVM is distributed along with a set of standard class libraries that  implement the Java application program interface(API).

• Java JVM and API form Java runtime environment(JRE).                  

                                              API+JVM=JRE

=> If your need is only to execute Java program on your machine.

• Ex- if you want to execute Java based game on your machine all you need only JRE. 
• But if you wish to also develop program on your machine, you need JDK.

• JDK

1. JDK contain tools that needed to develop the java program. as well as JRE to run the program.
2. Tools include compiler(Javac.exe), Java application launcher(Java.exe).

• Compiler convert Java code into bytecode Java application launcher open JRE, load the class and call its main() method.

1. debugger : Needed to detect, analyse and eliminate bugs in the program.