学生管理系统练习

步骤：1.定义学生类  2.主界面代码编辑 3.添加学生的代码编写 4.查看学生的代码编写 5.删除学生代码编写 6.修改学生代码编写


学生类
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ackage guanlixit;

import jdk.jshell.execution.FailOverExecutionControlProvider;

import javax.naming.PartialResultException;
import java.util.ArrayList;
import java.util.Scanner;

public class fangfa {
    String xuehao;
    String xingming;
    String nl;
    String dizhi;

    public static void tianjia(ArrayList guanli) {   //添加学生方法
        fangfa xues = new fangfa();
        Scanner tianjiaxues = new Scanner(System.in);
        System.out.println("请输入学号");
        String xuehaoR = tianjiaxues.nextLine();
        System.out.println("请输入姓名");
        String xingmingR = tianjiaxues.nextLine();
        System.out.println("请输入年龄");
        String nlR = tianjiaxues.nextLine();
        System.out.println("请输入地址");
        String dizhiR = tianjiaxues.nextLine();
        System.out.println("CS");
        xues.xuehao = xuehaoR;
        xues.xingming = xingmingR;
        xues.nl = nlR;
        xues.dizhi = dizhiR;
        guanli.add(xues);   //把学生对象翻入 合集
    }

    public static void shanchu(ArrayList sc) {  //删除学生方法
        Scanner xxu = new Scanner(System.in);
        System.out.println("请输入要删除的学号");
        String scxh = xxu.nextLine();

        for (int i = 0; i < sc.size(); i++) {
            fangfa a = (fangfa) sc.get(i);  //创建变量时候要用这个类创建不然没属性
            if (a.xuehao.equals(scxh)) {    //用这个对象的xuehao 跟输入做匹配，yongequals（）做字符匹配
                sc.remove(i);   //删除学生对象


            }
        }

    }

    public static void xiug(ArrayList xg) {   //修改学生方法
        System.out.println("请输入要修改学号");
        Scanner xxg = new Scanner(System.in);
        String xxgg = xxg.nextLine();
        for (int i = 0; i < xg.size(); i++) {

            fangfa ss = (fangfa) xg.get(i);  //把集合对象赋给SS，这样后面就可调用对象属性了      注意：要用类名创建
            
            if (ss.xuehao.equals(xxgg)) {   //用输入的变量跟对象的，学号做匹配，匹配字符内容 要用.equals()方法
                fangfa us = new fangfa();
                System.out.println("请输入新学号");
                Scanner x = new Scanner(System.in);
                String xxh = x.nextLine();
                System.out.println("请输入新姓名");
                String xxm = x.nextLine();
                System.out.println("请输入新年龄");
                String xnl = x.nextLine();
                System.out.println("请输入新地址");
                String xdz = x.nextLine();
                us.xuehao = xxh;
                us.xingming = xxm;
                us.nl = xnl;
                us.dizhi = xdz;
                xg.set(i, us);
            }
        }
    }


}
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主函数类
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public class man {
    public static void main(String[] args) {
        ArrayList<fangfa> xi=new ArrayList();
        while (true){
        System.out.println("-------欢迎使用我的学生管理系统---------");
        System.out.println("1.添加学生");
        System.out.println("2.删除学生");
        System.out.println("3.修改学生");
        System.out.println("4.查看所有学生");
        System.out.println("5.退出");
        System.out.println("请输入你的选择");
        Scanner shuru=new Scanner(System.in);
        int caidan=shuru.nextInt();
if(caidan>0||caidan<5){

    switch (caidan){
        case 1:fangfa.tianjia(xi);
            break;
        case 2:fangfa.shanchu(xi);
            break;
        case 3:fangfa.xiug(xi);
            break;
        case 4:
            System.out.println(xi.size());
            System.out.println("学号     姓名     年龄     地址");
            for (int i=0;i<xi.size();i++){
                System.out.println(xi.get(i).xuehao+"     " +xi.get(i).xingming+"     "+xi.get(i).nl+"     " +xi.get(i).dizhi ); }
    }


}


        }

    }}

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结果：

1.添加学生
2.删除学生
3.修改学生
4.查看所有学生
5.退出
请输入你的选择

学生管理系统练习

原文：https://www.cnblogs.com/gxtoo/p/12256895.html