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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. import java.util.*;
  7. import java.lang.*;
  8. import java.io.*;
  9.  
  10. import java.util.concurrent.CompletableFuture;
  11.  
  12. /* Name of the class has to be "Main" only if the class is public. */
  13. class Ideone
  14. {
  15. 	 public static void main(String[] args) throws Exception {
  16.       runTasks(2);
  17.       runTasks(0);
  18.   }
  19.  
  20.   private static void runTasks(int i) {
  21.       System.out.printf("-- input: %s --%n", i);
  22.       CompletableFuture
  23.               .supplyAsync(() -> {
  24.                   return 16 / i;
  25.               })
  26. 			  .supplyAsync(() -> {
  27.                   System.out.println("I WAS HERE");
  28. 				System.err.println("I WAS HERE");
  29. 				  return i;
  30.               })
  31.               .whenComplete((input, exception) -> {
  32.                   if (exception != null) {
  33.                       System.out.println("exception occurs");
  34.                       System.err.println(exception);
  35.                   } else {
  36.                       System.out.println("no exception, got result: " + input);
  37.                   }
  38.               })
  39.               .thenApply(input -> input * 3)
  40.               .thenAccept(System.out::println);
  41.  
  42.   }
  43. }
  44.  
Success #stdin #stdout #stderr 0.16s 62592KB
comments (?)
stdin 
Standard input is empty
stdout 
-- input: 2 --
I WAS HERE
no exception, got result: 2
6
-- input: 0 --
I WAS HERE
no exception, got result: 0
0
stderr 
I WAS HERE
I WAS HERE
https://ideone.com/BO2C88
language:
Java (HotSpot 12)
created:
16 days ago
visibility:
public

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