结构型设计模式_适配器模式
1. 适配器模式
1.1.公共部分
1.1.1.适配源
package com.skillstudy.designpattern.action.adapter;
/**
* Created by kikop on 2018/5/26.
* 适配源[Adaptee]
*/
public class Adaptee {
/**
* 生成发动机
*
*/
public void makeEnginee() {
System.out.println("[AdapterDesignPattern]AdapterSource-makeEnginee");
}
/**
* 生成轮子
*/
public void makeWheel() {
System.out.println("[AdapterDesignPattern]AdapterSource-makeWheel");
}
}
1.1.2.目标接口
基于需求分析得到。
package com.skillstudy.designpattern.action.adapter;
/**
* Created by kikop on 2018/5/26.
* 目标接口[Target]
* 这里定义你需要适配的接口
*/
public interface ITargetAdapter {
public void makeEnginee();
public void makeWheel();
}
1.2.类适配
1.2.1.类适配
package com.skillstudy.designpattern.action.adapter;
/**
* Created by kikop on 2018/5/26.
* 类适配器[Adapter]
*/
public class NorthClassAdapter extends Adaptee implements ITargetAdapter {
@Override
public void makeEnginee() {
//用目标方法替换
makeBattery();
}
@Override
public void makeWheel() {
super.makeWheel();
}
private void makeBattery() {
System.out.println("[AdapterDesignPattern]NorthClassAdapter-makeBattery");
}
}
1.2.2.类适配器测试
package com.skillstudy.designpattern.action.adapter;
import org.junit.Test;
/**
* Created by kikop on 2018/5/26.
*/
public class adapterClassTest {
@Test
public void testOrigin() {
Adaptee adapterSource = new Adaptee();
adapterSource.makeEnginee();
adapterSource.makeWheel();
testAdapter();
}
/**
* 类适配器
*/
@Test
public void testAdapter() {
Adaptee adapterSource = new NorthClassAdapter();
adapterSource.makeEnginee();
adapterSource.makeWheel();
}
}
1.3.对象适配
复合设计模式:优先使用组合,易于扩展，灵活性强。
1.3.1.对象适配
package com.skillstudy.designpattern.action.adapter;
/**
* Created by kikop on 2018/5/26.
* 对象适配器[Adapter]
*/
public class NorthObjectAdapter implements ITargetAdapter {
/**
* 适配源
*/
protected Adaptee adaptee;
public NorthObjectAdapter(Adaptee adapterSource) {
this.adaptee = adapterSource;
}
@Override
public void makeEnginee() {
makeBattery();
}
@Override
public void makeWheel() {
adaptee.makeWheel();
}
private void makeBattery() {
System.out.println("[AdapterDesignPattern]NorthClassAdapter-makeBattery");
}
}
1.3.1.对象适配器测试
package com.skillstudy.designpattern.action.adapter;
import org.junit.Test;
/**
* Created by kikop on 2018/5/26.
*/
public class adapterObjectTest {
@Test
public void testOrigin() {
Adaptee adapterSource = new Adaptee();
adapterSource.makeEnginee();
adapterSource.makeWheel();
testAdapter();
}
/**
* 类适配器
*/
@Test
public void testAdapter() {
Adaptee adapterSource = new Adaptee();
NorthObjectAdapter northObjectAdapter = new NorthObjectAdapter(adapterSource);
//makeEnginee 内部实现已经改变
northObjectAdapter.makeEnginee();
northObjectAdapter.makeWheel();
}
}
2. 总结
要使用已有的类,而该类接口与所需的接口并不匹配。