JDK:Java development kit is the software bundle which is used to develop java programs.
JRE:Java run time environmet which is used run the java programs.
JRE=Java virtual machine+Java Packages &Classes(like util, math, lang, awt,swing etc)+runtime libraries.
JVM:Java Virtual machine provide paltform independent execution.it means "write java ones and run any where " we can develop and compile the java program and we no need to worry about where it can be executed.Java programs can execute in any plat form.
Using JRE we can run the any java class file(byte code) without JDK but using JRE we can't develop and compile java programs .If you want to develop java you need java packages and class and other tools which include in jdk.
JVM is virtual because it is not physically exist it is not hardware.it coverts the java byte code into machine code corresponding to the operating system where it is run ,this mechanism provides Java platform independence.
Downloading Java Software: to install java in your system you have to install jdk and jre .but in latest jdk kit includes jre
To download JDK including jre click the following link (its free):
http://www.java.com/en/ or
http://www.oracle.com/technetwork/java/javase/downloads/index.html in this web page click the java standard edition.
unzip the source code using winrar or other tools double click on it and select the installation folder.
JRE:Java run time environmet which is used run the java programs.
JRE=Java virtual machine+Java Packages &Classes(like util, math, lang, awt,swing etc)+runtime libraries.
JVM:Java Virtual machine provide paltform independent execution.it means "write java ones and run any where " we can develop and compile the java program and we no need to worry about where it can be executed.Java programs can execute in any plat form.
Using JRE we can run the any java class file(byte code) without JDK but using JRE we can't develop and compile java programs .If you want to develop java you need java packages and class and other tools which include in jdk.
JVM is virtual because it is not physically exist it is not hardware.it coverts the java byte code into machine code corresponding to the operating system where it is run ,this mechanism provides Java platform independence.
Downloading Java Software: to install java in your system you have to install jdk and jre .but in latest jdk kit includes jre
To download JDK including jre click the following link (its free):
http://www.java.com/en/ or
http://www.oracle.com/technetwork/java/javase/downloads/index.html in this web page click the java standard edition.
unzip the source code using winrar or other tools double click on it and select the installation folder.
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