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class RealPrinter { // the "delegate"
     void print() { 
       System.out.print("something"); 
     }
 }

 class Printer { // the "delegator"
     RealPrinter p = new RealPrinter(); // create the delegate 
     void print() { 
       p.print(); // delegation
     } 
 }

 public class Main {
     // to the outside world it looks like Printer actually prints.
     public static void main(String[] args) {
         Printer printer = new Printer();
         printer.print();
     }
 }

interface I {
     void f();
     void g();
 }

 class A implements I {
     public void f() { System.out.println("A: doing f()"); }
     public void g() { System.out.println("A: doing g()"); }
 }

 class B implements I {
     public void f() { System.out.println("B: doing f()"); }
     public void g() { System.out.println("B: doing g()"); }
 }

 class C implements I {
     // delegation
     I i = new A();

     public void f() { i.f(); }
     public void g() { i.g(); }

     // normal attributes
     public void toA() { i = new A(); }
     public void toB() { i = new B(); }
 }


 public class Main {
     public static void main(String[] args) {
         C c = new C();
         c.f();     // output: A: doing f()
         c.g();     // output: A: doing g()
         c.toB();
         c.f();     // output: B: doing f()
         c.g();     // output: B: doing g()
     }
 }