求Java代码........

Question

1.定义一个研究生类（Postgraduate)，包含学号（num)、姓名(name)、性别(sex）三个私有的属性，均为只读属性;在构造方法中根据传入的参数为三个私有的属性赋值;有一个方法 printInfo，方法无参数无返回值,用于输出研究生的信息，输出格式“学号为XXX的学生名为XXX,X生”,假设学号“517021233”、姓名“黄珊”、性别“女”,则输出“学号为517021233的学生名为黄珊,女生”。请根据要求,完成以下代码。

Answer 1

public class Postgraduate {
    private Long num;

    private String name;

    private String sex;

    public Long getNum() {
        return num;
    }

    public void setNum(Long num) {
        this.num = num;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }



    public Postgraduate(Long num, String name, String sex) {
        this.num = num;
        this.name = name;
        this.sex = sex;
    }

    public  void printInfo(){
        System.out.println("学号为"+ this.num + "的学生名为"+ this.name + ","+this.sex+"生");
    }

    public static void main(String[] args) {
        Postgraduate postgraduate = new Postgraduate(517021233L,"黄珊","女");
        postgraduate.printInfo();
    }
}

学号为517021233的学生名为黄珊,女生