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  1. import java.io.*;
  2. import java.lang.reflect.*;
  3. import java.util.*;
  4.  
  5. class Point {
  6. 	final double x, y;
  7.  
  8. 	public Point(double x, double y) {
  9. 		this.x = x;
  10. 		this.y = y;
  11. 	}
  12.  
  13. 	public double getX() {
  14. 		return this.x;
  15. 	}
  16.  
  17. 	public double getY() {
  18. 		return this.y;
  19. 	}
  20.  
  21. 	public boolean equals(Object o) {
  22. 		Point p = (Point)o;
  23. 		return this.x == p.getX() && this.y == p.getY();
  24. 	}
  25. }
  26.  
  27. public class Main {
  28. 	public static void main(String[] args) {
  29. 		Point p = new Point(1,2);
  30. 		Point q = new Point(1,2);
  31.  
  32. 		System.out.println(p == q);
  33. 		System.out.println(p.equals(q));
  34.  
  35. 		try {
  36. 			Field f = Field.class.getDeclaredField("modifiers");
  37. 			Field x = Point.class.getDeclaredField("x");
  38. 			Field y = Point.class.getDeclaredField("y");
  39.  
  40. 			f.setAccessible(true);
  41. 			x.setAccessible(true);
  42. 			y.setAccessible(true);
  43. 			f.setInt(x, x.getModifiers() & ~Modifier.FINAL);
  44. 			f.setInt(y, y.getModifiers() & ~Modifier.FINAL);
  45.  
  46. 			x.set(p, 0);
  47. 			y.set(p, 1);
  48. 			x.set(q, 2);
  49. 			y.set(q, 3);
  50. 		} catch (Exception e) {
  51. 			System.out.println("We are having some issues");
  52. 			return;
  53. 		}
  54.  
  55. 		System.out.println(p == q);
  56. 		System.out.println(p.equals(q));
  57. 	}
  58. }
Success #stdin #stdout 0.1s 27900KB
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https://ideone.com/mmQJGr
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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