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System.gc() vs Runtime.gc()

 
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* What is the differance between System.gc() and Runtime.gc() ?
 
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System.gc() is just a convenience for Runtime.getRuntime().gc().

However, if you are genuinely a beginner, you should never be calling either of these methods.

99.9% of the time, Java will garbage-collect as appropriate and does not need you to tell it to do so. Calling one of the gc() methods does not force garbage collection to happen, either; it only suggests to the JVM that now might be a good time for some garbage collection.
 
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Read the API documentation of both of those methods. The documentation of System.gc() says:

The call System.gc() is effectively equivalent to the call:

Runtime.getRuntime().gc()


So, there is no difference in these two at all.
 
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