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  1. class Ideone {
  2.     public static void main(String[] args) throws java.lang.Exception {
  3.         A<ConcreteErrorHandler> a = new A<ConcreteErrorHandler>(new ConcreteErrorHandler());
  4.         a.m(); // Exception here!
  5.     }
  6.  
  7.     public static class AbstractErrorHandler {
  8.         public void handle() {
  9.             throw new UnsupportedOperationException("Not implemented");
  10.         }
  11.     }
  12.  
  13.     public static class ConcreteErrorHandler extends AbstractErrorHandler {
  14.         public void handle() {
  15.             System.out.println("Concrete handler");
  16.         }
  17.     }
  18.  
  19.     public static class A<T extends AbstractErrorHandler> {
  20.  
  21.         T instance;
  22.  
  23.         A(T instance) {
  24.             this.instance = instance;
  25.         }
  26.  
  27.         public void m() {
  28.             instance.handle();
  29.         }
  30.     }
  31. }
Success #stdin #stdout 0.1s 320320KB
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stdin 
Standard input is empty
stdout 
Concrete handler
https://ideone.com/Jnkn9U
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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