java design pattern - Adapter pattern

把不同的接口通过中间的adapter 连接在一起，概念很简单，看玩具代码很简单。

Example in JDK: 
java.util.Array #asList()
java.io.InputStreamReader(InputStream)(returns a Reader)
java.io.OutputStreamWriter(OutputStream)(returns a Writer)

package adapterpattern;

class Apple{
    public void getAppleColor(String color){
        System.out.println("Apple color is :"+color);
    }
}

class Orange{
    public void getOrangeColor(String color){
        System.out.println("Orange color is :"+color);
    }
}

class AppleAdapter extends Apple{

    //The purpose of the sample problme is to adapt an orange
    // as an apple
    private Orange orange;

    public AppleAdapter(Orange orange){
        this.orange = orange;
    }

    public void getColor(String color){
        orange.getOrangeColor(color);
    }
}


public class AdapterPatternDemo {
    public static void main(String[] args){
        Apple apple1 = new Apple();
        apple1.getAppleColor("green");

        Orange orange = new Orange();
        AppleAdapter adapter = new AppleAdapter(orange);
        adapter.getAppleColor("red");
    }
}