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  1. class Point {
  2. 	protected int x, y;
  3.  
  4. 	public boolean equals(Object o) {
  5. 		if (o == null) return false;
  6. 		if (o.getClass() != Point.class) return false;
  7. 		Point other = (Point)o;
  8. 		return other.x == x && other.y == y;
  9. 	}
  10.  
  11. 	public int hashCode() {
  12. 		return x * 31 + y;
  13. 	}
  14. }
  15.  
  16. class BuggyInit {
  17. 	public static void main (String[] args) {
  18. 		Point a = new Point();
  19. 		a.x = 3;
  20. 		a.y = 5;
  21.  
  22. 		Point b = new Point() { { x = 3; y = 5; } };
  23.  
  24. 		System.out.println("a.x == b.x ? " + (a.x == b.x));
  25. 		System.out.println("a.y == b.y ? " + (a.y == b.y));
  26. 		System.out.println("a == b ? " + a.equals(b));
  27. 		System.out.println("b == a ? " + b.equals(a));
  28. 	}
  29. }
Success #stdin #stdout 0.07s 380160KB
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Standard input is empty
stdout
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a.x == b.x ? true
a.y == b.y ? true
a == b ? false
b == a ? true
https://ideone.com/4HhOzK
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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