Java code to know Java version & OS details

Code
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public class SystemProperties {
public static void main(String[] args) {
System.out.println(System.getProperty("java.home"));
System.out.println(System.getProperty("os.name"));
System.out.println(System.getenv("windir"));

}
}

Sample output

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C:\Program Files\Java\jre7

Windows 7

C:\Windows

Explanation

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java.home: It is the property for which the value is the java home, the directory where Java is installed in the PC in which this program is executed.

getProperty(): This is a method of java.lang.System class which takes property name and returns property values.

System.getProperty("os.name"): This method is used for getting the value of specified property in Java. The os.name property means the name of the OS.

System.getenv(): Takes a property name and returns its value. env means environment.