Hi java.lang.System.gc() vs java.lang.Runtime.gc()

hi all what is the exact diff.,
java.lang.System.gc() vs java.lang.Runtime.gc()
why dont I call Runtime.gc() like System.gc(), is ther any possibility ?
Thanks in advance

Thanks, but I just want to call Runtime.gc() like
System.gc() forcefully to invoke finalize() method
Thanks in advanceThe calls are the same. Read the javadoc:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#gc()
public static void gc()
Runs the garbage collector.
Calling the gc method suggests that the Java Virtual Machine expend effort toward recycling unused objects in order to make the memory they currently occupy available for quick reuse. When control returns from the method call, the Java Virtual Machine has made a best effort to reclaim space from all discarded objects.
The call System.gc() is effectively equivalent to the call:
Runtime.getRuntime().gc()

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