Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

Week Target Achieved

1 30 21

2 30 22

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Typing Speed

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JVM

Java Virtual Machine

JVM is an execution engine that runs compiled Java byte code

JAVA IS DISTRIBUTED INTO TWO PACKAGES

• JDK is a set of tools for developing Java applications.

• Java Run-time Environment helps in running the programs.

• JVM interprets Java programs and allows them to run on any platform

• JIT is a module,which helps in compiling certain parts of byte code into the machine code for higher performance.

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How does JVM work?• A Java program is written

• The program is compiled

• A class file is produced containing bytecodes

• The bytecodes are interpreted by the JVM

• The JVM translates bytecodes into native machine code

Compiler

Java Virtual Machine

Native Machine Code

public class HelloWorld {

public static void main(String args[ ]) {

System.out.println(“Hello World!”);

}

}

Source Code

Class File

Bytecodes

When JRE is installed it contains JVM and JIT and the class libraries When JDK is installed it also contains the

JRE, JVM and JIT apart from the compiler, debugging tools.

comparison between jvm ,jre and jdk

1) JRE and JDK come as installer while JVM are bundled with them.

2) JRE only contain environment to execute java program but doesn’t contain other tool for compiling java program.

3) JVM comes along with both JDK and JRE and created when you execute Java program by giving “java” command

Just In Time Compiler

JIT is a module inside the JVM which helps in compiling certain parts of byte code into themachine code for higher performance. Note that only certain parts of byte code will be compiled to the machine code, the other parts are usually interpreted and executed

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