System.gc() 和System.runFinalization()

The   Java   language   provides   some   built-in   routines   for   controlling   garbage   collection:   the   methods   System.gc()   and   System.runFinalization().   System.gc()   requests   that   garbage   collection   be   run.   System.runFinalizers()   asks   that   finalizers   be   executed,   but   that   memory   is   not   necessarily   freed.

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