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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 Func<A> {
  11.       double apply(Optional<A> a);
  12.     }
  13.  
  14.     public static double compute(Func<? super Double> f) {
  15.         // Sometimes amend the function to do something slightly different
  16.         Func<? super Double> g = f;
  17.         if (System.currentTimeMillis() > 0)
  18.             g = oa -> Math.max(0, f.apply(oa.map(a -> a)));
  19.  
  20.         return g.apply(Optional.of(3.14)) + g.apply(Optional.empty());
  21.     }
  22.  
  23. 	public static void main (String[] args) throws java.lang.Exception
  24. 	{
  25. 		Func<Double> f = oa -> 0;
  26. 		compute(f);
  27.  
  28. 		Func<Object> g = oa -> 0;
  29. 		compute(g);
  30. 	}
  31. }
Success #stdin #stdout 0.22s 33244KB
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https://ideone.com/4Xoz8E
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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