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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. interface Relatable{
  8. 	public void large(Relatable other);
  9. }
  10.  
  11. class A implements Relatable{
  12.  
  13. 	public void large(Relatable other) {
  14. 		A obj = (A) other; 
  15. 		System.out.println("Hello");
  16. 	}
  17.  
  18. }
  19.  
  20. class B implements Relatable{
  21. 	//int p = 100;
  22. 	public void large(Relatable other) {
  23. 		System.out.println("Hi");
  24. 	}
  25. }
  26.  
  27. /* Name of the class has to be "Main" only if the class is public. */
  28. class Ideone
  29. {
  30. 	public static void main (String[] args) throws java.lang.Exception
  31. 	{
  32. 		Relatable a = new A();
  33. 		Relatable b = new B();
  34.  
  35. 		a.large(b);
  36. 	}
  37. }
Runtime error #stdin #stdout #stderr 0.06s 4386816KB
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Standard input is empty
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Standard output is empty
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Exception in thread "main" java.lang.ClassCastException: B cannot be cast to A
	at A.large(Main.java:14)
	at Ideone.main(Main.java:35)
https://ideone.com/epzM4F
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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