www.carfield.com.hk: ProxyDemo.java

Wed Dec 26 16:00:00 GMT 2001

ProxyDemo

//: c04:ProxyDemo.java
// Simple demonstration of the Proxy pattern.
import com.bruceeckel.test.*;

interface ProxyBase {
  void f();
  void g();
  void h();
}

class Proxy implements ProxyBase {
  private ProxyBase implementation;
  public Proxy() { 
    implementation = new Implementation(); 
  }
  // Pass method calls to the implementation:
  public void f() { implementation.f(); }
  public void g() { implementation.g(); }
  public void h() { implementation.h(); }
}

class Implementation implements ProxyBase {
  public void f() { 
    System.out.println("Implementation.f()"); 
  }
  public void g() { 
    System.out.println("Implementation.g()"); 
  }
  public void h() { 
    System.out.println("Implementation.h()"); 
  }
}

public class ProxyDemo extends UnitTest {
  Proxy p = new Proxy();
  public void test() {
    // This just makes sure it will complete 
    // without throwing an exception.
    p.f();
    p.g();
    p.h();
  }
  public static void main(String args[]) {
    new ProxyDemo().test();
  }
} ///:~

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