Adapter

以下是自己学习Adapter模式时的理解

interface Usb{
  void useUsbDevice();
}

class PC{
  Usb usb1;
  Usb usb2;
}

interface PS2{
  void usePS2Device();
}

class PS2Mouse implements PS2{
  void usePS2Device(){
    System.out.println("using mouse");
  }
}

PC想用PS2Mouse,但PS2Mouse没有实现Usb接口
Adapter登场

class PS2ToUsb implements Usb{
  PS2 ps2;

  void setPs2(PS2 ps2){
    this.ps2=ps2;
  }

  void useUsbDevice(){
    ps2.usePS2Device();
  }
}


class Test{
  public static void main(String[] args){
   PC mypc=new PC();//买了个新电脑
   PS2Mouse ps2m=new PS2Mouse();//买了个ps2鼠标
    PS2ToUsb p2m=new PS2ToUsb();//买了个适配器
    p2m.setPs2(ps2m);           //把鼠标插到适配器上
   pc.setUsb1(p2m);            //把适配器插到电脑的USB接口上
   pc.getUsb1.useUsbDevice();  //电脑可以用鼠标了
  }
}

-------------------------------------------------------

// 适配器
public static class ReaderToInputStream extends InputStream {
Reader reader;

public ReaderToInputStream(Reader reader) {
super();
this.reader = reader;
}

@Override
public int read() throws IOException {
try {
return reader.read();
} catch (IOException e) {
throw e;
}
}
}