适配器模式

组合方式实现

/** * 三相插座接口 */public interface IThreePlug {    //使用三相电流供电    void powerWithThree();}

public class GBTwoPlug {    //使用二相电流供电    public void powerWithTwo(){        System.out.println("使用二相电流供电");    }}

public class TwoPlugAdapter implements IThreePlug {    private GBTwoPlug plug;    public TwoPlugAdapter(GBTwoPlug plug) {        super();        this.plug = plug;    }    @Override    public void powerWithThree() {        System.out.println("通过组合方式转化");        plug.powerWithTwo();    }}

public class NoteBook {    private IThreePlug plug;    public NoteBook(IThreePlug plug){        this.plug=plug;    }    /**     * 使用插座充电     */    public void charge(){        plug.powerWithThree();    }}

public static void main(String[] args) {        GBTwoPlug two = new GBTwoPlug();        IThreePlug plug = new TwoPlugAdapter(two);        NoteBook noteBook = new NoteBook(plug);        noteBook.charge();    }

继承方式实现

/** * 采用继承方式的插座适配器 */public class TwoPlugClassAdapter extends GBTwoPlug implements IThreePlug{    @Override    public void powerWithThree() {        System.out.println("借助继承方式转化");        this.powerWithTwo();    }}

public static void main(String[] args) {        TwoPlugClassAdapter adapter = new TwoPlugClassAdapter();        NoteBook nb = new NoteBook(adapter);        nb.charge();    }