java适配器模式

怎么把A与B连接起来呢？适配器!
新建一个适配器类

package OO;

public class ShiPeiQi {
    public static void main(String[] args) {
        PowerA a=new PowerAImpl();
        PowerB b=new PowerBimpl();
        Adapter adapter = new Adapter(b);
        work(adapter);

    }
    public static void work(PowerA a){
        System.out.println("正在连接…………");
        a.insert();
        System.out.println("工作结束");
    }
}
//适配器
class Adapter implements PowerA{//adapter实现了A的接口
    private PowerB powerB;

    public Adapter(PowerB powerB) {
        this.powerB = powerB;
    }

    @Override
    public void insert() {
        powerB.connect();
    }
}

interface PowerB{
    public void connect();
}
class PowerBimpl implements PowerB{
    @Override
    public void connect() {
        System.out.println("电源B开始工作……");
    }
}
interface PowerA{
    public void insert();
}
class PowerAImpl implements PowerA{
    @Override
    public void insert() {
        System.out.println("电源A开始工作……");
    }
}