定义：将一个复杂对象的构造与它的表示分离，使同样的构建过程可以创建不同的表示
建造者（Builder）模式由产品、抽象建造者、具体建造者、指挥者等 4 个要素构成
//产品
class Product
{
private String partA;
private String partB;
private String partC;
public void setPartA(String partA)
{
this.partA=partA;
}
public void setPartB(String partB)
{
this.partB=partB;
}
public void setPartC(String partC)
{
this.partC=partC;
}
public void show()
{
//显示产品的特性
}
}
//抽象创建者
abstract class Builder
{
//创建产品对象
protected Product product=new Product();
public abstract void buildPartA();
public abstract void buildPartB();
public abstract void buildPartC();
//返回产品对象
public Product getResult()
{
return product;
}
}
//具体建造者
public class ConcreteBuilder extends Builder
{
public void buildPartA()
{
product.setPartA("建造 PartA");
}
public void buildPartB()
{
product.setPartB("建造 PartB");
}
public void buildPartC()
{
product.setPartC("建造 PartC");
}
}
//指挥者
class Director
{
private Builder builder;
public Director(Builder builder)
{
this.builder=builder;
}
//产品构建与组装方法
public Product construct()
{
builder.buildPartA();
builder.buildPartB();
builder.buildPartC();
return builder.getResult();
}
}
//Client
public class Client
{
public static void main(String[] args)
{
Builder builder=new ConcreteBuilder();
Director director=new Director(builder);
Product product=director.construct();
product.show();
}
}
