建造者模式(Builder Pattern)：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。生成器模式
建造者模式包含如下角色：
Builder：抽象建造者
ConcreteBuilder：具体建造者
Director：指挥者
Product：产品角色
public class Product
{
private String partA; //可以是任意类型
private String partB;
private String partC;
//partA的Getter方法和Setter方法省略
//partB的Getter方法和Setter方法省略
//partC的Getter方法和Setter方法省略
}
public abstract class Builder
{
protected Product product=new Product();
public abstract void buildPartA();
public abstract void buildPartB();
public abstract void buildPartC();
public Product getResult()
{
return product;
}
}
public class Director
{
private Builder builder;
public Director(Builder builder)
{
this.builder=builder;
}
public void setBuilder(Builder builder)
{
this.builder=builer;
}
public Product construct()
{
builder.buildPartA();
builder.buildPartB();
builder.buildPartC();
return builder.getResult();
}
}
……
Builder builder = new ConcreteBuilder();
Director director = new Director(builder);
Product product = director.construct();
……
