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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.concurrent.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		Ideone obj = new Ideone();
  14. 		Future<Integer> res = obj.doCallable();
  15. 		System.out.println(res.get());
  16. 		System.exit(0);
  17. 	}
  18. 	public Future<Integer> calculate(Integer input) {
  19. 		ExecutorService executor = Executors.newFixedThreadPool(1);
  20.         return executor.submit(() -> {
  21.         	long start = System.currentTimeMillis();
  22.             Thread.sleep(2000);
  23.             System.out.println("Sleep time in ms = "+(System.currentTimeMillis()-start));
  24.             return input * input;
  25.         });
  26.     }
  27.     public Future<Integer> doCallable() {
  28.     	int value = 99;
  29. 		try {
  30. 			Callable<Future> callable = () -> calculate(value);
  31. 			Future<Integer> future = callable.call();
  32. 			return future;
  33. 		} catch (final Exception e) {
  34. 			e.printStackTrace();
  35. 			throw new RuntimeException(e);
  36. 		}
  37.     }
  38. }
Success #stdin #stdout 0.21s 33888KB
comments (?)
stdin 
Standard input is empty
stdout 
Sleep time in ms = 2000
9801
https://ideone.com/HDvl7y
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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