建造者模式

package com.yf.model;

public abstract class Builder {
	public abstract void buildCPU();
	public abstract void buildMainBoard();
	public abstract void buildHD();
	public abstract Computer getComputer();

}

package com.yf.model;

import java.util.ArrayList;
import java.util.List;

public class Computer {
	private List<String> parts=new ArrayList<String>();
	
	public void add(String part){
		parts.add(part);
	}
	
	public void show(){
		for(int i=0;i<parts.size();i++){
			System.out.println("组件"+parts.get(i)+"装好了");
		}
		System.out.println("电脑组装完毕");
	}
	
}

package com.yf.model;

public class ConcreteBuilder extends Builder{
	
	Computer computer=new Computer();

	@Override
	public void buildCPU() {
		computer.add("cpu");
	}

	@Override
	public void buildMainBoard() {
		computer.add("mainBoard");
	}

	@Override
	public void buildHD() {
		computer.add("hd");
	}

	@Override
	public Computer getComputer() {
		// TODO Auto-generated method stub
		return computer;
	}

}

package com.yf.model;

public class Director {
	public void Construct(Builder builder){
		builder.buildCPU();
		builder.buildHD();
		builder.buildMainBoard();
	}

}

package com.yf.model;

public class testMain {
	public static void main(String[] args){
		/*Builder builder=new ConcreteBuilder();
		builder.buildCPU();
		builder.buildHD();
		builder.buildMainBoard();
		Computer c=builder.getComputer();
		c.show();*/
		Director d=new Director();
		Builder builder=new ConcreteBuilder();
		d.Construct(builder);
		Computer c=builder.getComputer();
		c.show();
		
	}

}

每次看设计模式都有不一样的收获。

每个类只做好自己的事情。

建造者模式更加关注于零件装配的顺序。