Free memory result should indicate whether Garbage collector has run : Garbage Collection « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » Garbage Collection

1.27.7.Free memory result should indicate whether Garbage collector has run

import java.util.Date;

   

   public class MainClass {

      public static void main(String [] args) {

         Runtime rt = Runtime.getRuntime();

         System.out.println("Total JVM memory: " + rt.totalMemory());

         System.out.println("Before Memory = " + rt.freeMemory());

         Date d = null;

         for(int i = 0;i<10000;i++) {

            d = new Date();

            d = null;

        }

        System.out.println("After Memory = " + rt.freeMemory());

        rt.gc();   // an alternate to System.gc()

        System.out.println("After GC Memory = " + rt.freeMemory());

     }

  }

1.27.Garbage Collection
	1.27.1.	JVM Garbage Collection
	1.27.2.	How to Cause Leaks in a Garbage Collection System
	1.27.3.	Avoiding the memory leak
	1.27.4.	To remove a reference to an object is to set the reference variable to null.
	1.27.5.	Reassigning a Reference Variable to remove a reference to an object
	1.27.6.	If an object is returned from the method, its reference might be assigned to a reference variable;
	1.27.7.	Free memory result should indicate whether Garbage collector has run
	1.27.8.	An Example of Garbage Collection in Action

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