Finding the multiple JRE installed path in Linux OS

for my requirement on finding the JRE installaiton folder on windows and Linux machines , I can able to get it in windows but I am facing problem in getting the jre installed path from Linux machine. I am using Debian etch OS. Can anyone help me to find the installed path of JRE in Linux machine using a Java program. I need to find the multuiple JRE installed paths, i.e. my java program should find all the JRE installed paths and versions of the same.
Thanks in advance.
Edited by: VijayForumScreen on Jul 29, 2008 5:46 AM

As per the terminal prompt its ok...but i need the java concept to retrieve the versions and installed paths of the all JRE.
e.g;For current JRE we can get by,
System.out.println(System.getProperty("java.version"));
System.out.println(System.getProperty("java.home"));
Output:
1.5.0_10
/usr/lib/jvm/java-1.5.0-sun-1.5.0.10/jre
If i installed 1.3 and 1.4 also.,
How can i get installed paths and versions for all three 1.3,1.4 and 1.5 JRE's

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