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  1. import java.lang.reflect.InvocationHandler;
  2. import java.lang.reflect.Method;
  3. import java.lang.reflect.Proxy;
  4.  
  5. public class Main {
  6.  
  7.     interface Foo { }
  8.  
  9.     interface Bar { }
  10.  
  11.     static class FooBar1 implements Foo, Bar {
  12.         public String toString() {
  13.             return "FooBar1";
  14.         }
  15.     }
  16.  
  17.     static class FooBar2 implements Foo, Bar {
  18.         public String toString() {
  19.             return "FooBar2";
  20.         }
  21.     }
  22.  
  23.  
  24.  
  25.     static <T extends Foo & Bar> T getFooBar1() {
  26.         return (T) new FooBar1();
  27.     }
  28.  
  29.     static <T extends Foo & Bar> T getFooBar2() {
  30.         return (T) new FooBar2();
  31.     }
  32.  
  33.     static <T extends Foo & Bar> T getFooBar() {
  34.         return (T) Proxy.newProxyInstance(
  35.                 Foo.class.getClassLoader(),
  36.                 new Class<?>[] {Foo.class, Bar.class},
  37.                 new InvocationHandler() {
  38.                     public Object invoke(Object proxy, Method method, Object[] args) {
  39.                         return "PROXY!!!";
  40.                     }
  41.                 }
  42.         );
  43.     }
  44.  
  45.     static <U extends Foo & Bar> void show(U u) {
  46.         System.out.println(u);
  47.     }
  48.  
  49.     public static void main(String[] args) {
  50.         show(getFooBar());
  51.         show(getFooBar1());
  52.         show(getFooBar2());
  53.     }
  54. }
Success #stdin #stdout 0.06s 215744KB
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Standard input is empty
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PROXY!!!
FooBar1
FooBar2
https://ideone.com/YuKQLq
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

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