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  1. class Exercise {
  2.   abstract static class Top {
  3.     public void f(Object o) {
  4.       System.out.println("Top");
  5.     }
  6.   }
  7.  
  8.   static class Sub extends Top {
  9.     public void f(String s) {
  10.       System.out.println("Sub");
  11.     }
  12.   }
  13.  
  14.   public static void main(String[] args) {
  15.     Sub sub = new Sub();
  16.     Top top = sub;
  17.  
  18.     String stringAsString = "someString";
  19.     Object stringAsObject = stringAsString;
  20.  
  21.     top.f(stringAsObject);
  22.     sub.f(stringAsObject);
  23.  
  24.     sub.f(stringAsString);
  25.     top.f(stringAsString);
  26.   }
  27. }
  28.  
Success #stdin #stdout 0.06s 32440KB
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Standard input is empty
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Top
Top
Sub
Top
https://ideone.com/Itthf5
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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