java基于数组的学生管理系统

用户类

import java.util.Scanner;


public class Stu_System {
    static boolean bool=true;
    static Student[] students = new Student[2000];
    //主函数
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
                            while(bool) {
                                System.out.println("****        高校学院管理系统    ****");
                                System.out.println("****        1：添加学生信息     ****");
                                System.out.println("****        2：查询学生信息     ****");
                                System.out.println("****        3：修改学生信息     ****");
                                System.out.println("****        4：删除学生信息     ****");
                                System.out.println("****        5：打印学生信息     ****");
                                System.out.println("****        6：退出            ****");
                                System.out.println("****   请输入你要进行的操作（1-6）    ****");

                                if (!sc.hasNextInt()) {
                                    System.out.println("请输入数字\n");
                                } else {
                                    int flag = sc.nextInt();
                                    switch (flag) {
                                        case 1:
                                            addstu();
                            break;
                        case 2:
                            inquirestu();
                            break;
                        case 3:
                            changestu();
                            break;
                        case 4:
                            deletestu();
                            break;
                        case 5:
                            printstu();
                            break;
                        case 6:
                            bool = false;
                            break;
                        default:System.out.println("请输入1-6");
                            break;
                    }

                }
            }
            sc.close();
            System.out.println("系统关闭");

    }
	//打印学生信息
    private static void printstu() {
        for (Student student : students) {
            if(student!=null)
            System.out.println(student);
        }
        System.out.println();
    }
	//删除学生信息
    private static void deletestu() {
        Scanner sc = new Scanner(System.in);
        System.out.println("删除的学生学号:");
        if(!sc.hasNextInt())
        {
            System.out.println("未输入学号");
            bool = false;
        }else {
            int ID = sc.nextInt();
            for(int i = 0;i

student类：

public class Student {
    private int ID;
    private String name;
    private String clas;

    public Student(int num,String name,String clas)
    {
        ID = num;
        this.name = name;
        this.clas = clas;
    }

    public String getName() {
        return name;
    }

    public String getClas() {
        return clas;
    }

    public void setID(int ID) {
        this.ID = ID;
    }

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

    public void setClas(String clas) {
        this.clas = clas;
    }

    public int getID() {
        return ID;
    }

    @Override
    public String toString() {
        return "Student{" +
                "ID=" + ID +
                ", name='" + name + '\'' +
                ", clas='" + clas + '\'' +
                '}';
    }
}