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  1. class Alpha {
  2.   public static void main(String[] args) {
  3.     Beta f = new Alpha();
  4.     System.out.println(f.test(3));
  5.   }
  6.   String test(int i) {
  7.     return (i + 2) + " ";
  8.   }
  9. }
  10. class Beta extends Alpha {
  11.   String test(int i) {
  12.     return (i + 1) + " ";
  13.   }
  14. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:3: incompatible types
found   : Alpha
required: Beta
    Beta f = new Alpha();
             ^
1 error
stdout
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Standard output is empty
https://ideone.com/93nRZ
language:
Java (HotSpot 12)
created:
14 years ago
visibility:
public

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