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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. 		WorkDistributer wd = new WorkDistributer();
  13. 		wd.enable();
  14. 		wd.performAction((w) -> {w.printHello();});
  15. 		wd.disable();
  16. 		wd.performAction((w) -> {w.printHello();});
  17. 		wd.enable();
  18. 		wd.performAction((w) -> {w.printAnswer();});
  19. 		wd.disable();
  20. 		wd.performAction((w) -> {w.printAnswer();});
  21. 	}
  22. }
  23. class WorkDistributer 
  24. {
  25. 	private boolean enabled = false;
  26. 	private ActionPerformer worker;
  27. 	public WorkDistributer() {
  28. 		this.worker = new Worker();
  29. 	}
  30. 	public void enable() {
  31. 	   enabled = true;
  32. 	}
  33. 	public void disable() {
  34. 		enabled = false;
  35. 	}
  36. 	public void performAction(ActionCommand command) {
  37. 		if(this.enabled) {
  38. 		   command.run(this.worker);
  39. 		}
  40. 	}
  41. }
  42. class Worker implements ActionPerformer {
  43. 	public void printHello() {
  44. 		System.out.println("hello");
  45. 	}
  46. 	public void printAnswer() {
  47. 		System.out.println(21 * 2);
  48. 	}
  49. }
  50.  
  51. interface ActionPerformer {
  52. 	public void printHello();
  53. 	public void printAnswer();
  54. }
  55.  
  56. interface ActionCommand {
  57. 	public void run(ActionPerformer worker);
  58. }
Success #stdin #stdout 0.07s 33708KB
comments (?)
stdin 
Standard input is empty
stdout 
hello
42
https://ideone.com/H6lQO8
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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