工厂方法模式

操作接口：

packagecom.jerry.design.factoryMethod.imp;

/**

*

*@authorjerry

*

*/

publicinterfaceinterfaceTest {

publicvoidtest(String name);

}

实现类A：

packagecom.jerry.design.factoryMethod.impl;

importcom.jerry.design.factoryMethod.imp.interfaceTest;

/**

*

*@authorjerry

*

*/

publicclassImplAimplementsinterfaceTest {

publicvoidtest(String name){

System.out.println(" my ImplA name is："+name);

}

}

实现类B：

packagecom.jerry.design.factoryMethod.impl;

importcom.jerry.design.factoryMethod.imp.interfaceTest;

/**

*

*@authorjerry

*

*/

publicclassImplBimplementsinterfaceTest {

publicvoidtest(String name){

System.out.println(" my ImplB name is："+name);

}

}

抽象类：

packagecom.jerry.design.factoryMethod.imp;

publicabstractclassabstractClass {

publicvoidtest(String name){

interfaceTest impl = getImpl();

impl.test(name);

}

publicabstractinterfaceTest getImpl() ;

}

子类A；

packagecom.jerry.design.factoryMethod.impl;

importcom.jerry.design.factoryMethod.imp.abstractClass;

importcom.jerry.design.factoryMethod.imp.interfaceTest;

publicclassClassAextendsabstractClass {

@Override

publicinterfaceTest getImpl() {

returnnewImplA();

}

}

子类B：

package com.jerry.design.factoryMethod.impl;

import com.jerry.design.factoryMethod.imp.abstractClass;

import com.jerry.design.factoryMethod.imp.interfaceTest;

public class ClassB extends abstractClass {

@Override

public interfaceTest getImpl() {

return new ImplB();

}

}

测试类：

packagecom.jerry.design.factoryMethod.client;

importcom.jerry.design.factoryMethod.imp.abstractClass;

importcom.jerry.design.factoryMethod.impl.ClassA;

importcom.jerry.design.factoryMethod.impl.ClassB;

publicclassTest{

publicstaticvoidmain(String[] args) {

abstractClass ac =newClassA();

ac.test("yushh");

abstractClass ac2 =newClassB();

ac2.test("yushh2");

// my ImplA name is：yushh

// my ImplB name is：yushh2

}

}

总结：分离出业务与创建，延迟实现。