Java学生管理系统（纯练手）
该系统主要功能如下：
- 添加学生：通过键盘录入学生信息，添加到集合中
- 删除学生：通过键盘录入要删除学生的学号，将该学生对象从集合中删除
- 修改学生：通过键盘录入要修改学生的学号，将该学生对象其他信息进行修改
- 查看学生：将集合中的学生对象信息进行展示
- 退出系统：结束程序
学生类的定义
package com.studentsystem;
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;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
测试类的定义
package com.studentsystem;
import java.util.ArrayList;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
ArrayList<Student> list = new ArrayList<>();
while(true){
System.out.println("--------欢迎来到学生管理系统----------");
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");
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"-> queryStudent(list);
case "5"->{
System.out.println("退出");
System.exit(0);
}
default->System.out.println("没有这个选项！");
}
}
}
public static void addStudent(ArrayList<Student> list){
Student student = new Student();
Scanner sc = new Scanner(System.in);
String id = null;
while(true){
System.out.println("请输入学生id:");
id = sc.next();
boolean flag = contains(list,id);
if(flag){
System.out.println("id已经存在，请重新输入！");
}else{
student.setId(id);
break;
}
}
System.out.println("请输入学生的姓名:");
String name = sc.next();
student.setName(name);
System.out.println("请输入学生的年龄:");
int age = sc.nextInt();
student.setAge(age);
System.out.println("请输入学生的家庭住址:");
String address = sc.next();
student.setAddress(address);
list.add(student);
System.out.println("学生信息添加成功！");
}
public static boolean contains(ArrayList<Student> list,String id){
return getIndex(list,id)>=0;
}
public static int getIndex(ArrayList<Student> list, String id){
//遍历集合
for (int i = 0; i < list.size(); i++) {
//得到每一个学生对象
Student stu = list.get(i);
//得到每一个学生对象的id
String sid = stu.getId();
//拿着集合中的学生id跟要查询的id进行比较
if(sid.equals(id)){
//如果一样，那么就返回索引
return i;
}
}
//当循环结束之后还没有找到，就表示不存在，返回-1.
return -1;
}
public static void deleteStudent(ArrayList<Student> list){
Scanner sc = new Scanner(System.in);
System.out.println("请输入要删除的id:");
String id = sc.next();
int index = getIndex(list,id);
if(index >=0){
list.remove(index);
System.out.println("id为："+id+"的学生删除成功！");
}else{
System.out.println("id不存在，删除失败！");
}
}
public static void updateStudent(ArrayList<Student> list){
Scanner sc = new Scanner(System.in);
System.out.println("请输入要修改的学生的id:");
String id = sc.next();
int index = getIndex(list,id);
if (index ==-1) {
System.out.println("所删除id为："+id+"的学生不存在！");
}
//获取要修改的学生对象
Student stu = list.get(index);
//输入其他的信息并修改
System.out.println("请输入要修改的学生姓名");
String newName = sc.next();
stu.setName(newName);
System.out.println("请输入要修改的学生年龄:");
int newAge = sc.nextInt();
stu.setAge(newAge);
System.out.println("请输入要修改的学生家庭住址:");
String newAddress = sc.next();
stu.setAddress(newAddress);
System.out.println("学生信息修改成功!");
}
public static void queryStudent(ArrayList<Student> list){
if (list.size() == 0) {
System.out.println("当前无学生信息，请添加后再查询!");
}
System.out.println("id\t\t姓名\t年龄\t家庭住址");
//当代码执行到这里，表示集合中是有数据的
for (Student stu : list) {
System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "\t" + stu.getAddress());
}
}
}
今天就记录到这里了！
