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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. 		Handler h = new Handler();
  13. 		h.run();
  14. 	}
  15. }
  16.  
  17. interface Listener {
  18. 	public void onEvent();
  19. 	public void onEventWithArgument(MyEvent e);
  20. }
  21.  
  22. class MyEvent {
  23. 	// Some properties.
  24. }
  25.  
  26. class ClassWithEvent {
  27. 	private final List<Listener> _listeners = new ArrayList<Listener>();
  28.  
  29. 	public void addListener(Listener listener) {
  30. 		_listeners.add(listener);
  31. 	}
  32.  
  33.         public void removeListener(Listener listener) {
  34. 		_listeners.remove(listener);
  35. 	}
  36.  
  37. 	private void onEvent() {
  38. 		for (Listener listener : _listeners) {
  39. 			listener.onEvent();
  40. 		}
  41. 	}
  42.  
  43. 	private void onEventWithArgument() {
  44. 		MyEvent e = new MyEvent();
  45. 		for (Listener listener : _listeners) {
  46. 			listener.onEventWithArgument(e);
  47. 		}
  48. 	}
  49.  
  50. 	public void fireEventWirhArgument() {
  51. 		onEventWithArgument();
  52. 	}
  53. }
  54.  
  55. class Handler {
  56. 	private final Listener handler1 = new Listener() {
  57. 		@Override
  58. 		public void onEvent() {
  59. 			System.out.println("handler 1");
  60. 		}
  61.  
  62.                 @Override
  63. 		public void onEventWithArgument(MyEvent e) {
  64. 			System.out.println(e.toString());
  65. 		}
  66. 	};
  67.  
  68. 	private final Listener handler2 = new Listener() {
  69. 		@Override
  70. 		public void onEvent() {
  71. 			System.out.println("handler 2");
  72. 		}
  73.  
  74. 		@Override
  75. 		public void onEventWithArgument(MyEvent e) {
  76. 			System.out.println(e.toString());
  77. 		}
  78. 	};
  79.  
  80. 	public void run() {
  81. 		ClassWithEvent foo = new ClassWithEvent();
  82. 		foo.addListener(handler1);
  83. 		foo.fireEventWirhArgument();
  84.  
  85. 		ClassWithEvent foo2 = new ClassWithEvent();
  86. 		foo2.addListener(handler1);
  87. 		foo2.fireEventWirhArgument();
  88. 	}
  89. }
Success #stdin #stdout 0.07s 380224KB
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MyEvent@1262f7c
MyEvent@1f784d7
https://ideone.com/uHLtU8
language:
Java (12.0.1)
created:
12 years ago
visibility:
secret

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