作者:whisper
链接:http://proprogrammar.com:443/article/441
声明:请尊重原作者的劳动,如需转载请注明出处
一个类的创建可能要完成一系列复杂的操作,这时候就可以用构造器模式来完成对象的创建
以人造车为例
构建者即其实现类
package creational.pattern.builder;
public abstract class Builder {
public abstract void buildEngine();
public abstract void buildTyre();
public abstract void buildCar();
public abstract void getCar();
}
package creational.pattern.builder;
public class BMW extends Builder {
@Override
public void buildEngine() {
System.out.println("build BMW engine.");
}
@Override
public void buildTyre() {
System.out.println("build BMW tyre.");
}
@Override
public void buildCar() {
System.out.println("build BMW car.");
}
@Override
public void getCar() {
System.out.println("get a BMW car.");
}
}
建造的实施方
package creational.pattern.builder;
public class Director {
public void product(Builder builder)
{
builder.buildCar();
builder.buildEngine();
builder.buildTyre();
}
}
测试代码
package creational.pattern.builder;
public class Client {
public static void main(String[] args) {
Builder builder=new BMW();//创建一个Builder对象
Director director=new Director();//创建一个Director对象
director.product(builder);//Director对象造车
builder.getCar();//将制造的车返回
}
}
运行效果
亲爱的读者:有时间可以点赞评论一下
全部评论