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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. interface Foo {
  8.         void foo();
  9. }
  10. interface Bar {
  11.         void bar();
  12. }
  13. interface FooBar extends Foo, Bar {
  14.     public static FooBar combine(Foo f, Bar b) {
  15.     	return new FooBar() {
  16.     		public void foo() { f.foo(); }
  17.     		public void bar() { b.bar(); }
  18.     	};
  19.     }
  20. }
  21.  
  22. class Parent {
  23.     protected String neededByFoo = "foo";
  24.     protected String neededByBar = "bar";
  25.  
  26.     public void fooA() {
  27.         System.out.println(neededByFoo + "A");
  28.     }
  29.     public void fooB() {
  30.         System.out.println(neededByFoo + "B");
  31.     }
  32.     public void barA() {
  33.         System.out.println(neededByBar + "A");
  34.     }
  35.     public void barB() {
  36.         System.out.println(neededByBar + "B");
  37.     }
  38.  
  39.     public static void main(String[] args) {
  40.     	Parent p = new Parent();
  41.     	foobar(FooBar.combine(p::fooA, p::barA));
  42.     	foobar(FooBar.combine(p::fooA, p::barB));
  43.     	foobar(FooBar.combine(p::fooB, p::barA));
  44.     	foobar(FooBar.combine(p::fooB, p::barB));
  45.     }
  46.     private static void foobar(FooBar fb) {
  47.     	fb.foo();
  48.     	fb.bar();
  49.     }
  50. }
Success #stdin #stdout 0.21s 33436KB
comments ()
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Standard input is empty
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fooA
barA
fooA
barB
fooB
barA
fooB
barB
https://ideone.com/fnBlAk
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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