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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8.  class GCTest
  9. {
  10. 	public static void main(String[] args)
  11. 	{
  12. 		GCTest test;
  13. 		// Without the null assignment
  14. 		test = create(0);
  15. 		test = create(1);
  16. 		test = null;
  17. 		System.gc();
  18.  
  19. 		try {Thread.sleep(10);} catch (Exception e){}
  20. 		System.out.println();
  21.  
  22. 		// With the null assignment
  23. 		test = create(2);
  24. 		test = null;
  25. 		test = create(3);
  26. 		test = null;
  27. 		System.gc();
  28.  
  29. 	}
  30.  
  31. 	private int id;
  32.  
  33. 	public GCTest(int id)
  34. 	{
  35. 		this.id = id;
  36. 		System.out.println("Created " + id);
  37. 	}
  38.  
  39. 	private static GCTest create(int id)
  40. 	{
  41. 		System.gc();
  42. 		try {Thread.sleep(10);} catch (Exception e){}
  43. 		return new GCTest(id);
  44. 	}
  45.  
  46. 	@Override
  47. 	protected void finalize() throws Throwable
  48. 	{
  49. 		super.finalize();
  50. 		System.out.println("Finalize " + id + " from Thread " + Thread.currentThread().getName());
  51. 	}
  52.  
  53. }
  54.  
Success #stdin #stdout 0.1s 380160KB
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Standard input is empty
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Created 0
Created 1
Finalize 1 from Thread Finalizer
Finalize 0 from Thread Finalizer

Created 2
Finalize 2 from Thread Finalizer
Created 3
Finalize 3 from Thread Finalizer
https://ideone.com/BwGfSN
Garbage Collector test
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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