Java运用设计模式中的建造者模式构建项目的实例解析

public interface Builder { 
 void buildPartA(); 
 void buildPartB(); 
 void buildPartC(); 
  
} 

public class BuilderImpl implements Builder { 
  
 @Override 
 public void buildPartA() { 
  System.out.println("建造部件A"); 
 } 
 
 @Override 
 public void buildPartB() { 
  System.out.println("建造部件B"); 
 } 
 
 @Override 
 public void buildPartC() { 
  System.out.println("建造部件C"); 
 } 
 
} 

public class BuilderImpl2 implements Builder { 
  
 @Override 
 public void buildPartA() { 
  System.out.println("建造部件AA"); 
 } 
 
 @Override 
 public void buildPartB() { 
  System.out.println("建造部件BB"); 
 } 
 
 @Override 
 public void buildPartC() { 
  System.out.println("建造部件CC"); 
 } 
 
} 

/** 
 * 指挥者：指导 如何 建造 
 * 组合Builder 
 */ 
public class Director { 
 private Builder builder; 
  
 public Director(Builder builder) { 
  this.builder = builder; 
 } 
 /** 
  * 建造方法：定义了建造的流程 
  * 如果需要其他流程来实现，再new一个指挥者Director就可 
  */ 
 public void construct() { 
  System.out.println("director 指挥 builder进行建造"); 
  builder.buildPartA(); 
  builder.buildPartB(); 
  builder.buildPartC(); 
 } 
  
} 

public class Director2 { 
 private Builder builder; 
  
 public Director2(Builder builder) { 
  this.builder = builder; 
 } 
 /** 
  * 建造方法：定义了建造的流程 
  * 如果需要其他流程来实现，再new一个指挥者Director就可 
  */ 
 public void construct() { 
  System.out.println("director2 指挥 builder进行建造"); 
  builder.buildPartB(); 
  builder.buildPartC(); 
  builder.buildPartA(); 
 } 
  
} 

public class Test { 
 public static void main(String[] args) { 
  Builder builder = new BuilderImpl(); 
  Director director = new Director(builder); 
  /* 
   * 同样的构建过程，不同的模块(buildPartA、buildPartB、buildPartC)实现， new一个builder的实现 
   * 不同的构建过程，new 一个director 
   * 不同的构建过程，不同的模块实现， new director，new builder 
   */ 
   
  director.construct(); 
   
  System.out.println(""); 
   
  Builder builder2 = new BuilderImpl2(); 
  Director director2 = new Director(builder2); 
  director2.construct(); 
   
  System.out.println(""); 
   
  Builder builder3 = new BuilderImpl2(); 
  Director2 director3 = new Director2(builder3); 
  director3.construct(); 
 } 
} 

director 指挥 builder进行建造 
建造部件A 
建造部件B 
建造部件C 
 
director 指挥 builder进行建造 
建造部件AA 
建造部件BB 
建造部件CC 
 
director2 指挥 builder进行建造 
建造部件BB 
建造部件CC 
建造部件AA