前言

实现目标，组合源，写个适配方法，适用于没办法改变源，但又想实现目标类。我暂时还没使用到过，但感觉用处还是蛮大的

UML类图

代码示例

package com.sw.learn.pattern.C_structre.a_adapter;public class Main {// 目标5v，接口表示提供了获取5v的能力interface FiveVolt {int get5Volt();}// 源（被适配类），继承表示提供获取220v的能力static class PowerSource220V {public int get220Volt() {return 220;}}// 源2（被适配类），继承表示提供获取110v的能力static class PowerSource110V {public int get110Volt() {return 110;}}// Adapter适配器: 充电器，把 220V 转为 5Vstatic class VoltageAdapter extends PowerSource220V implements FiveVolt {@Overridepublic int get5Volt() {int original = this.get220Volt();return original / 44; // 简化模拟变压过程}}// Adapter适配器: 充电器，把 110V 转为 5Vstatic class VoltageAdapter2 implements FiveVolt {private PowerSource110V powerSource110V;// 组合代替继承public VoltageAdapter2() {this.powerSource110V = new PowerSource110V();}@Overridepublic int get5Volt() {int original = powerSource110V.get110Volt();return original / 22; // 简化模拟变压过程}}// Client: 手机static class Phone {public void charge(FiveVolt power) {System.out.println("正在使用 " + power.get5Volt() + "V 电压充电");}}public static void main(String[] args) {Phone phone = new Phone();FiveVolt adapter = new VoltageAdapter();phone.charge(adapter);FiveVolt adapter2 = new VoltageAdapter2();phone.charge(adapter2);}
}