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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	interface Animal {
  8. 		public void eat();
  9. 	}
  10.  
  11. 	interface Dog extends Animal {
  12. 		public void woof();
  13. 	}
  14.  
  15. 	interface Cat extends Animal {
  16. 		void meow();
  17. 	}
  18.  
  19. 	static class Poppy implements Dog {
  20. 		public void eat() {}
  21. 		public void woof() {}
  22. 	}
  23.  
  24. 	static class Dazy implements Cat {
  25. 		public void eat() {}
  26. 		public void meow() {}
  27. 	}
  28.  
  29. 	static void replace(Animal animal) {
  30. 		animal = new Poppy();
  31. 	}
  32.  
  33. 	public static void main (String[] args) throws java.lang.Exception
  34. 	{
  35. 		Cat cat = new Dazy();
  36. 		replace(cat);
  37. 		cat.meow();
  38. 	}
  39. }
Success #stdin #stdout 0.06s 32272KB
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https://ideone.com/gZ5KJD
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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