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Java学习笔记——设计模式之九.建造者模式
建造者模式(Builder),将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。
Product类:
1 package cn.happy.design_pattern._09builder; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 public class Product { 7 8 List<String> parts = new ArrayList<>(); 9 10 public void add(String part){ 11 parts.add(part); 12 } 13 14 public void show(){ 15 System.out.println("创建产品..."); 16 for (String item : parts) { 17 System.out.println(item); 18 } 19 } 20 }
Builder类:
1 package cn.happy.design_pattern._09builder; 2 3 public abstract class Builder { 4 5 public abstract void BuildPartA(); 6 public abstract void BuildPartB(); 7 public abstract Product GetResult(); 8 }
Builder子类:
1 package cn.happy.design_pattern._09builder; 2 3 public class ConcreteBuilder1 extends Builder { 4 5 private Product product = new Product(); 6 @Override 7 public void BuildPartA() { 8 product.add("部件A"); 9 10 } 11 12 @Override 13 public void BuildPartB() { 14 product.add("部件B"); 15 16 } 17 18 @Override 19 public Product GetResult() { 20 // TODO Auto-generated method stub 21 return product; 22 } 23 24 } 25 26 public class ConcreteBuilder2 extends Builder { 27 28 private Product product = new Product(); 29 @Override 30 public void BuildPartA() { 31 product.add("部件X"); 32 33 } 34 35 @Override 36 public void BuildPartB() { 37 product.add("部件Y"); 38 39 } 40 41 @Override 42 public Product GetResult() { 43 // TODO Auto-generated method stub 44 return product; 45 } 46 47 }
Director类:
1 package cn.happy.design_pattern._09builder; 2 3 public class Director { 4 5 public void Construct(Builder builder){ 6 builder.BuildPartA(); 7 builder.BuildPartB(); 8 } 9 }
测试类:
1 package cn.happy.design_pattern._09builder; 2 3 public class Mmain { 4 public static void main(String[] args) { 5 Director director = new Director(); 6 Builder b1 = new ConcreteBuilder1(); 7 Builder b2 = new ConcreteBuilder2(); 8 director.Construct(b1); 9 b1.GetResult().show(); 10 director.Construct(b2); 11 b2.GetResult().show(); 12 } 13 }
Java学习笔记——设计模式之九.建造者模式
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