详解 Java静态代理

public class Stars implements IStars{
  private String name;

  public Stars(String name) {
    this.name = name;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public void sing(){
    System.out.println(getName() + " 唱了一首歌.");
  }

  public void dance(){
    System.out.println(getName() + " 跳了一支舞.");
  }
}

public interface IStars {
  void sing();
  void dance();
}

public class StarsProxy implements IStars{
  //保存接收的代理对象
  private IStars stars;

  public StarsProxy(IStars stars){
    this.stars = stars;
  }

  @Override
  public void sing() {
    System.out.println("我是代理，我收到了唱歌请求。");
    stars.sing();
    System.out.println("唱歌完毕");
  }

  @Override
  public void dance() {
    System.out.println("我是代理，我收到了跳舞请求。");
    stars.dance();
    System.out.println("跳舞完毕");
  }
}

public class Test {
  public static void main(String[] args){
    //创建目标对象
    IStars stars = new Stars("Frank");//代理对象，把目标传给代理对象，建立关系
    IStars starsProxy = new StarsProxy(stars);
    starsProxy.sing();
    starsProxy.dance();
  }
}

public class StarsProxy implements IStars{
  //保存接收的代理对象
  private IStars stars;
  //保存sing和dance的次数
  private int num;

  public StarsProxy(IStars stars){
    this.stars = stars;
  }

  @Override
  public void sing() {
    if (!ifWork()) {
      return;
    }
    System.out.println("我是代理，我收到了唱歌请求。");
    stars.sing();
    System.out.println("唱歌完毕");
  }

  @Override
  public void dance() {
    if (!ifWork()) {
      return;
    }
    System.out.println("我是代理，我收到了跳舞请求。");
    stars.dance();
    System.out.println("跳舞完毕");
  }

  /**
   * 是否继续工作
   * @return 是返回true，否则返回false
   */
  private boolean ifWork(){
    if (num > 3){
      System.out.println("明星今天已经很累了，明天再来吧。");
      return false;
    }else {
      num++;
      return true;
    }
  }
}

public class Test {
  public static void main(String[] args){
    //创建目标对象
    Stars stars = new Stars();
    stars.setName("Frank");

    //代理对象，把目标传给代理对象，建立关系
    StarsProxy starsProxy = new StarsProxy(stars);
    for (int i = 0;i < 5; i++){
      starsProxy.sing();
    }
  }
}