package Sy;

import java.util.Random;

public class Student {
 static int id = 1;
 static String[] majors = {
 "计科","机械","电气","通信","信息安全"
 };
 // 学号
 String no;
 // 姓名
 String name;
 // 专业
 String major;
 // 年龄
 int age;

 Student() {
 Random r = new Random();
 // 使用随机值初始化类
 no = String.format("20%02d%02d%06d", 10+r.nextInt(10), r.nextInt(10), r.nextInt(200));
 name = "学生" + id++;
 major = majors[r.nextInt(majors.length)];
 age = 18 + r.nextInt(4);
 }

 @Override
 public String toString() {
 return "Student{" +
 "no='" + no + '\'' +
 ", name='" + name + '\'' +
 ", major='" + major + '\'' +
 ", age=" + age +
 '}' + '\n';
 }
}