Can we force Garbage Collection in Java, if yes then how?

Answer 1

I agree with Salil's view. However there is lot changes in JVM spec w.r.t GC. and it depends on GC implementation however JSR says that call to GC must be a suggestion to GC daemon thread and not a immediate higher thread priority to execute.

Answer 2

You can not force garbage collection. Only you can call System.gc() which simply is a hint to the garbage collector that you want it to do a garbage collection.

There is no way to force and immediate collection though as garbage collector is non-deterministic.