Java学习--学生管理系统(残破版)

代码

Main.java

import java.util.ArrayList;
import java.util.Scanner;public class Main {public static void main(String[] args) {ArrayList<Student> list = new ArrayList<>();loop:while (true) {System.out.println("-----欢迎来到阿宝院校学生管理系统-----");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.查询学生");System.out.println("5.退出系统");System.out.println("请输入您的选择:");Scanner sc = new Scanner(System.in);String choose = sc.next();switch (choose) {case "1" -> AddStudent(list);case "2" -> DeleteStudent(list);case "3" -> UpdateStudent(list);case "4" -> LookStudent(list);case "5" -> {System.out.println("退出!");break loop;}default -> System.out.println("没有这个选项!");}}}// 添加学生public static void AddStudent(ArrayList<Student> list) {System.out.println("添加学生!");Student s = new Student();Scanner sc = new Scanner(System.in);System.out.println("请录入id:");while (true) {String id = sc.next();boolean soleIds = soleId(list, id);if (soleIds) {System.out.println("该id已经存在!");} else {s.setId(id);break;}}System.out.println("请输入姓名:");String name = sc.next();s.setName(name);System.out.println("请输入年龄:");int age = sc.nextInt();s.setAge(age);System.out.println("请输入家庭住址:");String address = sc.next();s.setAddress(address);list.add(s);}//删除学生的信息public static void DeleteStudent(ArrayList<Student> list) {System.out.println("请输入要删除的学生id:");Scanner sc = new Scanner(System.in);String id = sc.next();// 查询有没有这个学生int indexValue = getIndex(list, id);if (indexValue >= 0) {list.remove(indexValue);System.out.println("删除成功!");} else {System.out.println("该id不存在!");}}//修改学生的信息public static void UpdateStudent(ArrayList<Student> list) {System.out.println("请输入要修改的学生id:");Scanner sc = new Scanner(System.in);String id = sc.next();// 查询有没有这个学生Boolean values = soleId(list, id);int indexValue = getIndex(list, id);if (values) {Student stu = list.get(indexValue);System.out.println("请输入要修改的姓名:");String name = sc.next();stu.setName(name);System.out.println("请输入要修改的年龄:");int age = sc.nextInt();stu.setAge(age);System.out.println("请输入要修改的家庭住址:");String address = sc.next();stu.setAddress(address);System.out.println("修改成功!");} else {System.out.println("该id不存在!");}}//查询学生的信息public static void LookStudent(ArrayList<Student> list) {//如果没有学生if (list.isEmpty()) {System.out.println("当前暂无学生,请先添加后再查询!");return;}System.out.println("id\t姓名\t年龄\t家庭住址");for (int i = 0; i < list.size(); i++) {Student stu = list.get(i);System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "\t" + stu.getAddress());}}//判断id是否唯一public static Boolean soleId(ArrayList<Student> list, String id) {for (int i = 0; i < list.size(); i++) {Student stu = list.get(i);String ids = stu.getId();if (ids.equals(id)) {return true;}}return false;}//获取集合中的索引public static int getIndex(ArrayList<Student> list, String id) {for (int i = 0; i < list.size(); i++) {Student stu = list.get(i);String ids = stu.getId();if (ids.equals(id)) {return i;}}return -1;}
}

Student.java

public class Student {private String id;private String name;private int age;private String address;public Student() {}public Student(String id, String name, int age, String address) {this.id = id;this.name = name;this.age = age;this.address = address;}/*** 获取* @return id*/public String getId() {return id;}/*** 设置* @param id*/public void setId(String id) {this.id = id;}/*** 获取* @return name*/public String getName() {return name;}/*** 设置* @param name*/public void setName(String name) {this.name = name;}/*** 获取* @return age*/public int getAge() {return age;}/*** 设置* @param age*/public void setAge(int age) {this.age = age;}/*** 获取* @return address*/public String getAddress() {return address;}/*** 设置* @param address*/public void setAddress(String address) {this.address = address;}}

效果图

主界面

增加和查询

删除