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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 <T, X> Optional<T> cast(Optional<X> orgOptional, Class<T> clazz) {
  11.     return orgOptional //
  12.         .filter(clazz::isInstance) // check instance
  13.         .map(clazz::cast); // cast
  14. }
  15.  
  16. public static <T, X> Optional<T> cast2(Optional<X> orgOptional, Class<? extends T> clazz) {
  17.     return orgOptional //
  18.         .filter(clazz::isInstance) // check instance
  19.         .map(clazz::cast); // cast
  20. }
  21.  
  22. 	public static void main (String[] args) throws java.lang.Exception
  23. 	{
  24. 		Ideone instance = new Ideone();
  25. 		Optional<? extends Ideone> opt = cast(Optional.empty(), instance.getClass());
  26. 		Optional<Ideone> opt2 = cast2(Optional.empty(), instance.getClass());
  27. 	}
  28. }
Success #stdin #stdout 0.12s 2184192KB
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https://ideone.com/HXaUE2
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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