templateMethod(模板方法模式)

MakeCar.java

package edu.hhxy;
/*
 * 组装车
 */
public abstract class MakeCar {
    //组装车头
    public abstract void makeHead();
    
    //组装车身
    public abstract void makeBody();
    
    //组装车尾
    public abstract void makeTail();
    
    public void make() {
        this.makeHead();
        this.makeBody();
        this.makeTail();
    }
}

MakeBus.java

package edu.hhxy;

public class MakeBus extends MakeCar {

    public void makeBody() {
        System.out.println("bus:组装车身");
    }

    public void makeHead() {
        System.out.println("bus:组装车头");
    }

    public void makeTail() {
        System.out.println("bus:组装车尾");
    }
}

MakeJeep.java

package edu.hhxy;

public class MakeJeep extends MakeCar {

    public void makeBody() {
        System.out.println("jeep:组装车身");
    }

    public void makeHead() {
        System.out.println("jeep:组装车头");
    }

    public void makeTail() {
        System.out.println("jeep:组装车尾");
    }

}

MakeKa.java

package edu.hhxy;

public class MakeKa extends MakeCar {

    public void makeBody() {
        System.out.println("ka:组装车身");
    }

    public void makeHead() {
        System.out.println("ka:组装车头");
    }

    public void makeTail() {
        System.out.println("ka:组装车尾");
    }
    
}

MainClass.java

package edu.hhxy;

public class MainClass {
    public static void main(String[] args) {
        MakeCar bus = new MakeBus();
//        bus.makeHead();
//        bus.makeBody();
//        bus.makeTail();
        bus.make();
        
        System.out.println("-------------------");
        
        MakeCar jeep = new MakeJeep();
//        jeep.makeHead();
//        jeep.makeBody();
//        jeep.makeTail();
        jeep.make();
        
        System.out.println("-------------------");
        
        MakeCar ka = new MakeKa();
        ka.make();
    }
}

以下采用Spring配置方式

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
    <bean id="makeBus" class="edu.hhxy.MakeBus" />
    <bean id="makeJeep" class="edu.hhxy.MakeJeep" />
    <bean id="makeKa" class="edu.hhxy.MakeKa" />
</beans>

采用junit进行测试（MakeCarClassTest）（通过接口接收getBean，接收的bean可以是接口的实现类，需要哪个实现类，就get哪个实现类，低耦合）

package edu.hhxy;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MakeCarClassTest {
    @Test
    public void getCar() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext(
                "applicationContext.xml");
        MakeCar makeCar = (MakeCar) ctx.getBean("makeBus");
        System.out.println(makeCar);
    }
}