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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 Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		Object foo = new Object() {
  13. 			@Override
  14. 			public boolean equals(Object other) {
  15. 				return other == this;
  16. 			}
  17. 			@Override
  18. 			public int hashCode() {
  19. 				return 42;
  20. 			}
  21. 		};
  22. 		List<String> list = new ArrayList<>();
  23. 		for (int i = 0 ; i != 1000000 ; i++) {
  24. 			list.add(""+i+"-"+31*i);
  25. 		}
  26. 		for (Object o : list) {
  27. 			o.equals(foo);
  28. 			foo.equals(o);
  29.     	}
  30. 		long t1 = System.currentTimeMillis();
  31. 		boolean g1 = false;
  32. 		for (int i = 0 ; i != 5 ; i++) {
  33. 			for (Object o : list) {
  34. 				g1 |= o.equals(foo);
  35. 			}
  36. 		}
  37. 		long t2 = System.currentTimeMillis();
  38. 		boolean g2 = false;
  39. 		for (int i = 0 ; i != 5 ; i++) {
  40. 			for (Object o : list) {
  41. 				g2 |= foo.equals(o);
  42. 			}
  43. 		}
  44. 		long t3 = System.currentTimeMillis();
  45. 		System.out.println(t2-t1);
  46. 		System.out.println("Result: "+g1);
  47. 		System.out.println(t3-t2);
  48. 		System.out.println("Result: "+g2);
  49. 	}
  50. }
Success #stdin #stdout 0.3s 4386816KB
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stdin
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Standard input is empty
stdout
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45
Result: false
34
Result: false
https://ideone.com/mHnD2S
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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