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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. 	interface Task {
  11. 		void doSomething();
  12. 	}
  13.  
  14. 	interface Factory {
  15. 		Task makeTask(String taskDescription);
  16. 	}
  17.  
  18. 	static Map<String, Factory> taskMap = new HashMap<>();
  19.  
  20. 	static {
  21. 		taskMap.put("sayHello", new Factory() {
  22. 			@Override
  23. 			public Task makeTask(String taskPayload) {
  24. 				return new Task() {
  25. 					@Override
  26. 					public void doSomething() {
  27. 						System.out.println("Hello " + taskPayload);
  28. 					}
  29. 				};
  30. 			}
  31. 		});
  32. 	}
  33.  
  34. 	static void onTask(String taskName, String taskPayload) {
  35. 		Factory factory = taskMap.get(taskName);
  36. 		if (factory == null) {
  37. 			System.out.println("Unknown task: " + taskName);
  38. 			return;
  39. 		}
  40. 		Task task = factory.makeTask(taskPayload);
  41.  
  42. 		// execute task somewhere
  43. 		task.doSomething();
  44. 	}
  45.  
  46. 	public static void main(String[] args) {
  47. 		onTask("sayHello", "qingl97");
  48. 		onTask("sayGoodbye", "qingl97");
  49. 	}
  50. }
Success #stdin #stdout 0.1s 320576KB
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stdin
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Standard input is empty
stdout
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Hello qingl97
Unknown task: sayGoodbye
https://ideone.com/We5FZk
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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