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();
}
}
construct方法内部,builder不用加this吗,这样构造函数里面的this.builder = builder又是干什么用的