public class DrawRectangle {//畫方 
  public void drawRectangle(String msg) { 
    System.out.println("draw Rectangle: " + msg); 
  } 
} 

public interface IDrawCircle {//畫圓的接口 
  void drawCircle(); 
} 

/** 
 * 類適配器 使用對(duì)象繼承的方式，是靜態(tài)的定義方式 
 * @author stone 
 * 
 */ 
public class DrawAdapter4Class extends DrawRectangle implements IDrawCircle {//既能畫方又能畫圓 
 
  @Override 
  public void drawCircle() { 
    System.out.println("DrawAdapter4Class: drawCircle"); 
  } 
   
} 

/** 
 * 對(duì)象適配器： 使用對(duì)象組合的方式，是動(dòng)態(tài)組合的方式。 
 * 既能畫方又能畫圓 
 * @author stone 
 * DrawAdapter是適配器，DrawRectangle屬于adapter,是被適配者，適配器將被適配者和適配目標(biāo)（DrawCircle）進(jìn)行適配 
 * 
 */ 
public class DrawAdapter4Object implements IDrawCircle {//既能畫方又能畫圓 
   
  private DrawRectangle drawRectangle; 
  public DrawAdapter4Object(DrawRectangle drawRectangle) { 
    this.drawRectangle = drawRectangle; 
  } 
   
  @Override 
  public void drawCircle() { 
    System.out.println("DrawAdapter4Object: drawcircle"); 
  } 
   
  public void drawRectangle(String msg) { 
    drawRectangle.drawRectangle(msg); 
  }  
   
} 

/* 
 * 接口適配器:接口中有抽象方法，我們只想實(shí)現(xiàn)其中的幾個(gè)，不想全部實(shí)現(xiàn)， 
 * 所以提供一個(gè)默認(rèn)空實(shí)現(xiàn)，然后繼承自它，重寫實(shí)現(xiàn)我們想實(shí)現(xiàn)的方法 
 */ 
public interface IDraw { 
  void drawCircle(); 
  void drawRectangle(); 
} 

/* 
 * 接口適配器 的默認(rèn)實(shí)現(xiàn) 
 */ 
public class DefaultDrawAdapter implements IDraw {//畫方 畫圓 皆為空實(shí)現(xiàn) 
 
  @Override 
  public void drawCircle() { 
     
  } 
 
  @Override 
  public void drawRectangle() { 
     
  } 
} 

public class Test { 
  public static void main(String[] args) { 
    //對(duì)象適配器 
    DrawAdapter4Object objAdapter = new DrawAdapter4Object(new DrawRectangle()); 
    objAdapter.drawCircle(); 
    objAdapter.drawRectangle(" in DrawAdapter4Object"); 
     
    System.out.println("--------------"); 
     
    //類適配器 
    DrawAdapter4Class clzAdapter = new DrawAdapter4Class(); 
    clzAdapter.drawCircle(); 
    clzAdapter.drawRectangle("in DrawAdapter4Class"); 
     
    System.out.println("--------------"); 
     
    //接口適配器 
    MyDrawAdapter myDrawAdapter = new MyDrawAdapter(); 
    myDrawAdapter.drawCircle(); 
    myDrawAdapter.drawRectangle(); 
  } 
   
  static class MyDrawAdapter extends DefaultDrawAdapter { 
 
    @Override 
    public void drawCircle() { 
      System.out.println("drawCircle in MyDrawAdapter"); 
    } 
     
  } 
} 

DrawAdapter4Object: drawcircle 
draw Rectangle: in DrawAdapter4Object 
-------------- 
DrawAdapter4Class: drawCircle 
draw Rectangle: in DrawAdapter4Class 
-------------- 
drawCircle in MyDrawAdapter