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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. 	private static Object obj;
  10.  
  11. 	public static void main (String[] args) {
  12. 		obj = "teste";
  13. 		String st = to(String.class);
  14. 		System.out.println(st);
  15.  
  16. 		obj = 10;
  17. 		Integer it = to(Integer.class);
  18. 		System.out.println(it);
  19.  
  20. 		try {
  21. 		    obj = true;
  22. 		    Double dt = to(Double.class); // Erro!
  23. 		    System.out.println(dt);
  24. 		} catch(ClassCastException cce) {
  25. 			System.out.println("Erro: double esperado, boolean encontrado!");
  26. 		}
  27. 	}
  28.  
  29. 	public static <E> E to(Class<E> classe) {
  30.     	return classe.cast(obj);
  31. 	}
  32. }
Success #stdin #stdout 0.06s 380224KB
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stdin
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Standard input is empty
stdout
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teste
10
Erro: double esperado, boolean encontrado!
https://ideone.com/oNgAvc
language:
Java (12.0.1)
created:
9 years ago
visibility:
public

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