建造者模式（builder），将一个复杂对象的构建与他的表示分离，使得同样的构建过程可以创建不同的表示。

1 package com.sun.builder; 2  3 import java.util.ArrayList; 4 import java.util.List; 5  6 /** 7  * 产品类 由多个部件组成 8  *  9  * @author sunafei10  * 11  */12 public class Product {13     List
     
       parts = new ArrayList
      
       ();14 15     public void add(String part) {
   //添加产品部件16         this.parts.add(part);17     }18 19     public void show() {
   //列举所有产品部件20         System.out.println("产品创建");21         for (String part : parts) {22             System.out.println(part);23         }24     }25 }
      
     

1 package com.sun.builder; 2  3 /** 4  * 抽象建造者类，确定产品有两个部件组成，并声明一个得到产品建造后结果的方法getResult 5  * @author SunAFei 6  * 7  */ 8 public abstract class Builder { 9     public abstract void builderPartA();10 11     public abstract void builderPartB();12     13     public abstract Product getResult();14 }

1 package com.sun.builder; 2  3 /** 4  * 具体建造者类 5  * @author SunAFei 6  * 7  */ 8 public class ConcreteBuilder1 extends Builder { 9 10     Product product = new Product();11 12     @Override13     public void builderPartA() {14         product.add("A");15     }16 17     @Override18     public void builderPartB() {19         product.add("B");20     }21 22     @Override23     public Product getResult() {24         return product;25     }26 27 }

1 package com.sun.builder; 2  3 public class ConcreteBuilder2 extends Builder { 4  5     Product product = new Product(); 6  7     @Override 8     public void builderPartA() { 9         product.add("X");10     }11 12     @Override13     public void builderPartB() {14         product.add("Y");15     }16 17     @Override18     public Product getResult() {19         return product;20     }21 22 }

package com.sun.builder;/** * 指挥者类 * @author SunAFei * */public class Director {        public void construct(Builder builder) {
   //指挥建造过程        builder.builderPartA();        builder.builderPartB();    }}

1 package com.sun.builder; 2  3 public class BuilderDemo { 4  5     public static void main(String[] args) { 6         Director director = new Director(); 7         Builder b1 = new ConcreteBuilder1(); 8         Builder b2 = new ConcreteBuilder2(); 9         10         director.construct(b1);11         Product p1 = b1.getResult();//客户不需要知道具体的建造过程12         p1.show();13         14         director.construct(b2);15         Product p2 = b2.getResult();16         p2.show();17     }18 19 }