设计模式之五适配器模式

基本介绍

 

 工作原理

 

类适配器模式

 

代码演示

package com.atguigu.adapter.classadapter;

//被适配的类
public class Voltage220V {
    //输出220V的电压
    public int output220V() {
        int src = 220;
        System.out.println("电压=" + src + "伏");
        return src;
    }
}

package com.atguigu.adapter.classadapter;


//ΚΚΕδ½ΣΏΪ
public interface IVoltage5V {
    public int output5V();
}

package com.atguigu.adapter.classadapter;

//适配器类
public class VoltageAdapter extends Voltage220V implements IVoltage5V {

    @Override
    public int output5V() {
        // TODO Auto-generated method stub
        //获取到220V电压
        int srcV = output220V();
        int dstV = srcV / 44 ; //转成 5v
        return dstV;
    }

}

package com.atguigu.adapter.classadapter;

public class Phone {

    //充电
    public void charging(IVoltage5V iVoltage5V) {
        if(iVoltage5V.output5V() == 5) {
            System.out.println("电压为5V, 可以充电~~");
        } else if (iVoltage5V.output5V() > 5) {
            System.out.println("电压大于5V, 不能充电~~");
        }
    }
}

package com.atguigu.adapter.classadapter;

public class Client {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println(" === ÀàÊÊÅäÆ÷ģʽ ====");
        Phone phone = new Phone();
        phone.charging(new VoltageAdapter());
    }

}

对象适配器

uml类图

 

代码演示

package com.atguigu.adapter.objectadapter;

//适配器类
public class VoltageAdapter  implements IVoltage5V {

    private Voltage220V voltage220V; // 关联关系-聚合
    
    
    //通过构造器，传入一个 Voltage220V 实例
    public VoltageAdapter(Voltage220V voltage220v) {
        
        this.voltage220V = voltage220v;
    }



    @Override
    public int output5V() {
        
        int dst = 0;
        if(null != voltage220V) {
            int src = voltage220V.output220V();//获取220V 电压
            System.out.println("使用对象适配器，进行适配~~");
            dst = src / 44;
            System.out.println("适配完成，输出的电压为=" + dst);
        }
        
        return dst;
        
    }

}

package com.atguigu.adapter.objectadapter;

public class Client {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println(" === ΆΤΟσΚΚΕδΖχΔ£Κ½ ====");
        Phone phone = new Phone();
        phone.charging(new VoltageAdapter(new Voltage220V()));
    }

}

接口适配器

相关介绍

 

 

uml类图

 

代码演示

package com.atguigu.adapter.interfaceadapter;

public interface Interface4 {
    public void m1();
    public void m2();
    public void m3();
    public void m4();
}

package com.atguigu.adapter.interfaceadapter;

//在AbsAdapter 我们将 Interface4 的方法进行默认实现
public abstract class AbsAdapter implements Interface4 {

    //默认实现
    public void m1() {

    }

    public void m2() {

    }

    public void m3() {

    }

    public void m4() {

    }
}

package com.atguigu.adapter.interfaceadapter;

public class Client {
    public static void main(String[] args) {
        
        AbsAdapter absAdapter = new AbsAdapter() {
            //只需要去覆盖我们 需要使用 接口方法
            @Override
            public void m1() {
                // TODO Auto-generated method stub
                System.out.println("使用了m1的方法");
            }
        };
        
        absAdapter.m1();
    }
}