适配器（一）

单项适配器模式：

原接口：

packagecom.jerry.design.adapter1.imp;

publicinterfaceInterfaceA {

publicvoidtestA();

}

接口实现类：

packagecom.jerry.design.adapter1.impl;

importcom.jerry.design.adapter1.imp.InterfaceA;

publicclassImplAimplementsInterfaceA{

@Override

publicvoidtestA() {

System.out.println(" i am do something as InterfaceA!");

}

}

目标接口：

packagecom.jerry.design.adapter1.imp;

publicinterfaceInterfaceB {

publicvoidtestB();

}

目标接口实现类：

packagecom.jerry.design.adapter1.impl;

importcom.jerry.design.adapter1.imp.InterfaceA;

importcom.jerry.design.adapter1.imp.InterfaceB;

publicclassImplBimplementsInterfaceB{

privateInterfaceAimplA;

publicImplB(InterfaceA implA){

this.implA= implA;

}

@Override

publicvoidtestB() {

implA.testA();

}

}

测试方法：

packagecom.jerry.design.adapter1.client;

importcom.jerry.design.adapter1.imp.InterfaceA;

importcom.jerry.design.adapter1.imp.InterfaceB;

importcom.jerry.design.adapter1.impl.ImplA;

importcom.jerry.design.adapter1.impl.ImplB;

publicclassTest {

publicstaticvoidmain(String[] args) {

InterfaceA implA = (InterfaceA)newImplA();

InterfaceB implB = (InterfaceB)newImplB(implA);

implB.testB();// i am do something as InterfaceA!

}

}

总结：原接口转换为目标接口