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  1. public class Main {
  2.     interface A {
  3.         int a();
  4.     }
  5.  
  6.     static class B implements A {
  7.         @Override
  8.         public int a() {
  9.             return 1;
  10.         }
  11.     }
  12.  
  13.     static class C implements A {
  14.         @Override
  15.         public int a() {
  16.             return 2;
  17.         }
  18.     }
  19.  
  20.     static class D1 implements A {
  21.         @Override
  22.         public int a() {
  23.             return (new B()).a() + (new C()).a();
  24.         }
  25.     }
  26.  
  27.  
  28.     static class D2 implements A {
  29.         private B b;
  30.         private C c;
  31.  
  32.         public D2(B b, C c) {
  33.             this.b = b;
  34.             this.c = c;
  35.         }
  36.  
  37.         @Override
  38.         public int a() {
  39.             return b.a() + c.a();
  40.         }
  41.     }
  42.  
  43.     public static void main(String[] args) {
  44.         B b = new B();
  45.         C c = new C();
  46.         D1 d1 = new D1();
  47.         D2 d2 = new D2(b, c);
  48.  
  49.         System.out.format("B = %d%n", b.a());
  50.         System.out.format("C = %d%n", c.a());
  51.         System.out.format("D1 = %d%n", d1.a());
  52.         System.out.format("D2 = %d%n", d2.a());
  53.     }
  54. }
Success #stdin #stdout 0.1s 28248KB
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stdin
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Standard input is empty
stdout
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B = 1
C = 2
D1 = 3
D2 = 3
https://ideone.com/gT0VyC
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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