代码如下：
public class CeShi {
public static void main(String[] args) {
JianZaoZhe jianZaoZhe=new JianZaoZhe.Builder().setName("laliang").setAge(24).setFenShu(100).build();
System.out.println(jianZaoZhe.toString());
}
}
class JianZaoZhe{
private String name;
private int age;
private float fenShu;
private JianZaoZhe(){
}
@Override
public String toString() {
return name+","+age+","+fenShu;
}
public static class Builder{//建造者模式的内部类必须是静态的才行，因为外部类构造方法是private，所以只有内部类是static修饰的，才能和外部类脱离开来
private JianZaoZhe jianZaoZhe;
public Builder(){
jianZaoZhe=new JianZaoZhe();
}
public Builder setName(String name){//设置外部类属性的这些方法必须是public的，对外提供接口
jianZaoZhe.name=name;
return this;
}
public Builder setAge(int age){
jianZaoZhe.age=age;
return this;
}
public Builder setFenShu(float fenShu){
jianZaoZhe.fenShu=fenShu;
return this;
}
public JianZaoZhe build(){
return jianZaoZhe;
}
}
}
