Java学生管理系统

代码

import java.util.Scanner;
/*学生类*/
public class Student {
    private String sid;
    private String name;
    private String age;
    private String address;

    public Student(){}
    public Student(String name,String age){
        this.name = name;
        this.age = age;
        this.sid = sid;
        this.address = address;

    }
    public String getSid(){
        return sid;
    }
    public void setSid(String sid){this.sid = sid; }
    public void setName(String name){
        this.name = name;
    }

    public String getName(){
        return name;
    }
    public void setAge(String age){
        this.age = age;
    }
    public String getAge(){
        return age;
    }
    public String getAddress(){
        return address;
    }
    public void setAddress(String address){
        this.address = address;
    }
}

import javax.crypto.spec.PSource;
import java.util.ArrayList;
import java.util.Scanner;

public class StudentDemo {
    public static void main(String[] args) {
        //创建集合对象用来存储学生数据
        ArrayList<Student> array =new ArrayList<Student>();
        while(true) {
            System.out.println("欢迎登录学生管理系统");

            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.查看学生");
            System.out.println("5.退出");
            System.out.println("请输入你的选择");
            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();
            switch (line) {
                case "1":
                    //System.out.println("添加学生");
                    addStudent(array);
                    break;
                case "2":
                    //System.out.println("删除学生");
                    delectStudent(array);
                    break;
                case "3":
                    //System.out.println("修改学生");
                    updataStudent(array);
                    break;
                case "4":
                    //System.out.println("查看学生");
                    findAllStudent(array);
                    break;
                case "5":
                    System.out.println("退出");
                    //break;
                    System.exit(0);//jvm退出


            }
        }
    }
    public static void addStudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);
        String sid;
        while(true) {
            System.out.println("请输入学生学号：");
            sid = sc.nextLine();
            boolean flag = isUsed(array, sid);
            if (flag) {
                System.out.println("你输入的学会已经被使用，请重新输入");
            }else{
                break;
            }
        }
        System.out.println("请输入学生名字：");
        String name = sc.nextLine();
        System.out.println("请输入学生年龄：");
        String age = sc.nextLine();
        System.out.println("请输入学生地址：");
        String address = sc.nextLine();
        Student s = new Student();
        //创建学生对象，把键盘录入的数据赋值给学生对象的成员变量
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        //将学生对象添加到集合中
        array.add(s);
        System.out.println("添加成功");
    }
    public static boolean isUsed(ArrayList<Student> array,String sid){
        boolean flag = false;
        for(int i=0; i<array.size(); i++){
            Student s = array.get(i);
            if(s.getSid().equals(sid)){
                flag = true;
                break;
            }
        }
        return flag;
    }
    public static void findAllStudent(ArrayList<Student> array){
        if(array.size() == 0){
            System.out.println("无信息");
            return;
        }
        System.out.println("学号\t\t\t姓名\t\t年龄\t\t居住地");
        for(int i=0; i< array.size(); i++){
            Student s = array.get(i);
            System.out.println(s.getSid() +"\t" + s.getName() + "\t" +s.getAge() + "\t\t" + s.getAddress());
        }
    }
    /*public static void delectStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入想删的学生号：");
        String sid sc.nextInt();
        for(int i=0; i< array.size(); i++){
            Student s = array.get(i);
            if(s.getSid().equals(sid)){
                array.remove(i);
                break;
            }
        }
        System.out.println("删除成功");
    }*/
    public static void delectStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入想删的学生号：");
        String sid = sc.nextLine();
        int index = -1;
        for(int i=0; i<array.size();i++) {
            Student s = array.get(i);
            if(s.getSid().equals(sid)){
                index = i;
                break;
            }
        }
        if(index == -1){
            System.out.println("该信息不存在");
        }else{
            array.remove(index);
            System.out.println("删除成功");
        }
    }
    public static void updataStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要修改的学生的学号：");
        String sid = sc.nextLine();
        //键盘录入要修改的学生信息
        System.out.println("请输入学生新姓名：");
        String name =sc.nextLine();
        System.out.println("请输入学生新年龄：");
        String age =sc.nextLine();
        System.out.println("请输入学生新地址：");
        String address =sc.nextLine();
        //创建学生对象
        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        //遍历集合修改对应的学生信息
        for(int i=0;i< array.size();i++){
            Student student = array.get(i);
            if(student.getSid().equals(sid)){
                array.set(i,s);
                break;
            }
        }
        System.out.println("修改成功");
    }
}