设计模式(12) -- 建造者模式

设计模式(12) -- 建造者模式

文章目录

​​需求​​

​​传统写法​​​​优缺点​​

​​建造者模式​​

​​介绍​​​​建 造者模式的四个角 色​​​​改进方案类图​​​​代码​​

​​类似建造者模式的jdk源码​​​​总结​​​​源码地址​​

需求

传统写法

AbstractHouse

public abstract class AbstractHouse { //打地基 public abstract void buildBasic(); //砌墙 public abstract void buildWalls(); //封顶 public abstract void roofed(); public void build() { buildBasic(); buildWalls(); roofed(); }}

CommonHouse

public class CommonHouse extends AbstractHouse { @Override public void buildBasic() { // TODO Auto-generated method stub System.out.println(" 普通房子打地基 "); } @Override public void buildWalls() { // TODO Auto-generated method stub System.out.println(" 普通房子砌墙 "); } @Override public void roofed() { // TODO Auto-generated method stub System.out.println(" 普通房子封顶 "); }}

测试

public class Client { public static void main(String[] args) { // TODO Auto-generated method stub CommonHouse commonHouse = new CommonHouse(); commonHouse.build(); }}

优缺点

建造者模式

介绍

建 造者模式的四个角 色

改进方案类图

代码

House

//产品->Productpublic class House { private String baise; private String wall; private String roofed; public String getBaise() { return baise; } public void setBaise(String baise) { this.baise = baise; } public String getWall() { return wall; } public void setWall(String wall) { this.wall = wall; } public String getRoofed() { return roofed; } public void setRoofed(String roofed) { this.roofed = roofed; }}

HouseBuilder

// 抽象的建造者public abstract class HouseBuilder { protected House house = new House(); //将建造的流程写好, 抽象的方法 public abstract void buildBasic(); public abstract void buildWalls(); public abstract void roofed(); //建造房子好， 将产品(房子) 返回 public House buildHouse() { return house; }

CommonHouse

public class CommonHouse extends HouseBuilder { @Override public void buildBasic() { // TODO Auto-generated method stub System.out.println(" 普通房子打地基5米 "); } @Override public void buildWalls() { // TODO Auto-generated method stub System.out.println(" 普通房子砌墙10cm "); } @Override public void roofed() { // TODO Auto-generated method stub System.out.println(" 普通房子屋顶 "); }}

HighBuilding

public class HighBuilding extends HouseBuilder { @Override public void buildBasic() { // TODO Auto-generated method stub System.out.println(" 高楼的打地基100米 "); } @Override public void buildWalls() { // TODO Auto-generated method stub System.out.println(" 高楼的砌墙20cm "); } @Override public void roofed() { // TODO Auto-generated method stub System.out.println(" 高楼的透明屋顶 "); }}

HouseDirector

//指挥者，这里去指定制作流程，返回产品public class HouseDirector { HouseBuilder houseBuilder = null; //构造器传入 houseBuilder public HouseDirector(HouseBuilder houseBuilder) { this.houseBuilder = houseBuilder; } //通过setter 传入 houseBuilder public void setHouseBuilder(HouseBuilder houseBuilder) { this.houseBuilder = houseBuilder; } //如何处理建造房子的流程，交给指挥者 public House constructHouse() { houseBuilder.buildBasic(); houseBuilder.buildWalls(); houseBuilder.roofed(); return houseBuilder.buildHouse(); }}

测试

public class Client { public static void main(String[] args) { //盖普通房子 CommonHouse commonHouse = new CommonHouse(); //准备创建房子的指挥者 HouseDirector houseDirector = new HouseDirector(commonHouse); //完成盖房子，返回产品(普通房子) House house = houseDirector.constructHouse(); //System.out.println("输出流程"); System.out.println("--------------------------"); //盖高楼 HighBuilding highBuilding = new HighBuilding(); //重置建造者 houseDirector.setHouseBuilder(highBuilding); //完成盖房子，返回产品(高楼) houseDirector.constructHouse(); }}

类似建造者模式的jdk源码

建 造者模式在 JDK 的应用和源码分 析

总结

源码地址

​​https://github.com/hufanglei/java-design/tree/builder​​

完

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