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To set the PATH variable permanently, add the full path of the jdk1.7.0\bin directory to the PATH variable. Typically, this full path looks something like C:\Program Files\Java\jdk1.7.0\bin. Set the PATH variable as follows on Microsoft Windows: Click Start, then Control Panel, then System. Click Advanced, then Environment Variables. Add the location of the bin folder of the JDK installation for the PATH variable in System Variables.
Launch the Windows Start menu Click on Programs Find the Java program listing Click About Java to see the Java version Java Version in the Java Control Panel-Windows and Mac OS X The Java version can be found in the Java Control Panel.n order to use the command line tools, you will need to download the Java Development Kit (JDK). The JRE and JDK are separate and can coexist on your system. Only one JRE can be installed on Mac OS X. There can be multiple JDKs installed on a system, as many as you wish.