Java implementa el sistema de gestión de estudiantes—versión consola:
puede realizar una serie de operaciones como agregar, eliminar, modificar y consultar la información de los estudiantes.
Para algunos problemas lógicos, como modificar a un alumno que no existe, se devolverá un aviso. . . .
La captura de pantalla del resultado del programa es la siguiente:
El código es el siguiente:
package Student;
public class Student {
//学号
private String sid;
//姓名
private String name;
//年龄
private String age;
//居住地
private String address;
//年级
private String grade;
//专业信息
private String major;
public Student(){
}
public Student(String sid, String name, String age, String address, String grade, String major) {
this.sid = sid;
this.name = name;
this.age = age;
this.address = address;
this.grade = grade;
this.major = major;
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getGrade() {
return grade;
}
public void setGrade(String grade) {
this.grade = grade;
}
public String getMajor() {
return major;
}
public void setMajor(String major) {
this.major = major;
}
}
package Student;
import java.util.ArrayList;
import java.util.Scanner;
public class StudentManager {
public static void main(String[] args) {
// 创建学生对象，用于存储学生数据
ArrayList<Student> array = new ArrayList<>();
while(true){
// 主界面
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.查看所有学生");
System.out.println("5.搜索学生信息");
System.out.println("6.退出");
System.out.println("请输入你的选择：");
//用Scanner实现键盘录入
Scanner scanner = new Scanner(System.in);
String line = scanner.nextLine();
//用switch语句完成选择操作
switch(line){
case"1":
// System.out.println("添加学生");
addStudent(array);
break;
case"2":
// System.out.println("删除学生");
deleteStudent(array);
break;
case"3":
// System.out.println("修改学生");
updateStudent(array);
break;
case"4":
// System.out.println("查看所有学生");
findAllStudent(array);
break;
case"5":
findStudent(array);
break;
case"6":
System.out.println("谢谢使用");
System.exit(0);//jvm退出。
}
}
}
// 定义一个方法，用于添加学生信息。
public static void addStudent(ArrayList<Student> array){
// 创建录入学生对象的数据信息，显示提升信息，提升输入何种信息
Scanner scanner = new Scanner(System.in);
String sid;
// 为了让程序能够回到这里，我们使用循环实现
while(true){
System.out.println("请输入学生学号：");
sid = scanner.nextLine();
boolean flag = isUsed(array,sid);
if (flag){
System.out.println("学号已经使用过，请从新输入：");
}else {
break;
}
}
System.out.println("请输入学生姓名：");
String name = scanner.nextLine();
System.out.println("请输入学生年龄：");
String age = scanner.nextLine();
System.out.println("请输入学生年级：");
String grade = scanner.nextLine();
System.out.println("请输入学生专业");
String major = scanner.nextLine();
System.out.println("请输入学生居住地：");
String address = scanner.nextLine();
//创建学生对象，把键盘录入的数据赋值个学生对象的成员变量
Student student = new Student();
student.setSid(sid);
student.setName(name);
student.setAge(age);
student.setGrade(grade);
student.setMajor(major);
student.setAddress(address);
// 将学生对象添加到集合中
array.add(student);
// 给出添加成功的提升
System.out.println("添加学生成功！");
}
// 定义一个方法，判断学号是否被使用
public static boolean isUsed(ArrayList<Student> array,String sid){
boolean flag=false;
for (int i = 0; i < array.size(); i++) {
Student student = array.get(i);
if (student.getSid().equals(sid)){
flag = true;
break;
}
}
return flag;
}
//删除学生
public static void deleteStudent(ArrayList<Student> array){
// 这里录入要删除的学生信息。
Scanner scanner = new Scanner(System.in);
System.out.println("请输入你要删除的学生学号：");
String sid = scanner.nextLine();
// 遍历集合后将对应的对象从集合中删除。
int index=-1;
for (int i = 0; i < array.size(); i++) {
Student student = array.get(i);
if (student.getSid().equals(sid)){
//比较
index = i;
break;
}
}
if (index==-1){
System.out.println("该信息不存在，请重新输入！");
}else {
array.remove(index);
System.out.println("删除学生成功");
}
}
//查看所有学生
public static void findAllStudent(ArrayList<Student> array){
if (array.size()==0){
System.out.println("无数据，请先添加信息");
return;
}
System.out.println("学号\t\t\t姓名\t\t年龄\t\t年级\t\t专业\t\t居住地");
for (int i = 0; i < array.size(); i++) {
Student student = array.get(i);
System.out.println(student.getSid()+"\t\t"+ student.getName()+"\t\t"+ student.getAge()+"岁"+"\t"+student.getGrade()+"\t"+student.getMajor()+"\t"+ student.getAddress());
}
}
// 修改学生信息
public static void updateStudent(ArrayList<Student> array){
// 键盘录入要修改的学生学号
Scanner scanner = new Scanner(System.in);
System.out.println("请输入需要修改的学生学号：");
String sid = scanner.nextLine();
for (int i = 0; i < array.size(); i++) {
Student s = array.get(i);
if (!s.getSid().equals(sid)){
System.out.println("没有这个学生，输入错误");
return;
}
}
// 键盘录入修改的信息
System.out.println("请输入学生姓名：");
String name = scanner.nextLine();
System.out.println("请输入学生年龄：");
String age = scanner.nextLine();
System.out.println("请输入学生年级：");
String grade = scanner.nextLine();
System.out.println("请输入学生专业");
String major = scanner.nextLine();
System.out.println("请输入学生居住地：");
String address = scanner.nextLine();
// 创建学生对象
Student student = new Student();
student.setSid(sid);
student.setName(name);
student.setAge(age);
student.setGrade(grade);
student.setMajor(major);
student.setAddress(address);
// 遍历信息
for (int i = 0; i < array.size(); i++) {
Student student1 = array.get(i);
if (student1.getSid().equals(sid)){
array.set(i,student);
break;
}
}
System.out.println("修改成功");
}
// 查找学生
public static void findStudent(ArrayList<Student> array){
Scanner scanner = new Scanner(System.in);
if (array.size()==0){
System.out.println("无数据，请先添加信息");
return;
}
System.out.println("输入你想查找的学生学号：");
String sid = scanner.nextLine();
System.out.println("学号\t\t\t姓名\t\t年龄\t\t年级\t\t专业\t\t居住地");
for (int i = 0; i < array.size(); i++) {
Student student = array.get(i);
if (student.getSid().equals(sid))
System.out.println(student.getSid()+"\t\t"+ student.getName()+"\t\t"+ student.getAge()+"岁"+"\t"+student.getGrade()+"\t"+student.getMajor()+"\t"+ student.getAddress());
}
}
}
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