[Java知识库]学生管理系统java版

学生管理系统

主类

package Com;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManage {
    public static void main(String[] args) {
        ArrayList<Student> a = new ArrayList<Student>();//写在外边是有原因的,集合内存覆盖全部
        boolean flag = true;
        while (flag) {
            Scanner s = new Scanner(System.in);
            System.out.println("请输入您的选项");
            print();
            if (s.hasNextInt()) {
                int num = s.nextInt();
                switch (num) {
                    case 1:
                        System.out.println("添加学生");
                        addS(a);
                        break;
                    case 2:
                        System.out.println("删除学生");
                        deletes(a);
                        break;
                    case 3:
                        System.out.println("修改学生");
                        adapts(a);
                        break;
                    case 4:
                        System.out.println("查看所有学生");
                        finds(a);
                        break;
                    case 5:
                        System.out.println("退出成功");
                        flag = false;
                        break;
                    case 6:
                        System.out.println("请输入你的选项");
                        break;
                    default:
                        System.out.println("你输入的选项超出范围");
                        break;
                }
            } else {
                System.out.println("请输入数字选项");
            }
        }
    }

    public static void print() {
        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.退出");
        System.out.println("请输入您的选择");
    }

    public static void addS(ArrayList<Student> s) {
        Scanner s1 = new Scanner(System.in);
        System.out.println("请输入学生学号");
        String sid = s1.nextLine();
        System.out.println("请输入学生姓名");
        String name = s1.nextLine();
        System.out.println("请输入学生年龄");
        String age = s1.nextLine();
        System.out.println("请输入学生居住地");
        String address = s1.nextLine();
        //创建学生对象类,把录入数据赋值给学生对象的变量中
        Student ss = new Student();
        ss.setSid(sid);
        ss.setName(name);
        ss.setAge(age);
        ss.setAddress(address);
        //将学生对象添加到集合中
        s.add(ss);
        //添加成功
        System.out.println("添加成功");

    }

    public static void finds(ArrayList<Student> o) {
        if(o.size()==0){
            System.out.println("无学生信息，请您添加");
            return;//结束下边语句
        }
        System.out.println("学号\t姓名\t\t年龄\t居住地");
        for (int i = 0; i < o.size(); i++) {
            Student a = o.get(i);
            System.out.println("第"+i+"号"+a.getSid()+"\t"+a.getName()+"\t" + a.getAge()+"\t"+a.getAddress());
        }
    }

    public static void deletes(ArrayList<Student> s){
        System.out.println("学号\t姓名\t年龄\t\t居住地");
        for (int i = 0; i < s.size(); i++) {
            Student a = s.get(i);
            System.out.println("第"+i+"号"+a.getSid()+"\t"+a.getName()+"\t" + a.getAge()+"\t"+a.getAddress());
        }
        /*System.out.println("请选择你要删除的学生信息");

       boolean flag=true;//判断删除序号
      while(flag) {
            Scanner c = new Scanner(System.in);
            if (c.hasNextInt()) {
                int c1 = c.nextInt();
                if (c1 < s.size() && c1 >= 0) {
                    s.remove(c1);
                    System.out.println("删除成功");
                    flag = false;
                } else {
                    System.out.println("请您重写输入");
                    flag = true;
                }
            }else{
                System.out.println("请你重新输入");
                flag=true;
            }
        }*/
        System.out.println("请输入你要删除学生的学号");
        //以上是一种方法，还有一种
        Scanner ml = new Scanner(System.in);
        String ml1 = ml.nextLine();
        int index=-1;//利用索引来判断，更优化细节
        for (int i = 0; i < s.size(); i++) {
            Student a=s.get(i);
            if(a.getSid().equals(ml1)){
              index=i;
              break;
        }
           if (index ==-1){
               System.out.println("删除失败");
           }else{
               s.remove(i);
               System.out.println("删除成功");
           }
        }
    }

    public static void adapts(ArrayList<Student> y){
        System.out.println("学号\t姓名\t\t年龄\t居住地");
        for (int i = 0; i < y.size(); i++) {
            Student a = y.get(i);
            System.out.println("第"+i+"个"+a.getSid()+"\t"+a.getName()+"\t" + a.getAge()+"\t"+a.getAddress());
        }
        System.out.println("请输入你要修改学生的信息,请输入学号");
            Scanner s1 = new Scanner(System.in);
            int u=s1.nextInt();
                System.out.println("请输入学生学号");
                String sid = s1.nextLine();
                System.out.println("请输入学生姓名");
                String name = s1.nextLine();
                System.out.println("请输入学生年龄");
                String age = s1.nextLine();
                System.out.println("请输入学生居住地");
                String address = s1.nextLine();
                //创建学生对象类,把录入数据赋值给学生对象的变量中
                Student ss = new Student();
                ss.setSid(sid);
                ss.setName(name);
                ss.setAge(age);
                ss.setAddress(address);
                //将学生对象添加到集合中
                y.add(ss);
        for (int i = 0; i < y.size(); i++) {
            Student a=y.get(i);
            if (a.getSid().equals(sid)){
                y.set(i,ss);
                break;
            }
        }
        System.out.println("修改学生成功");
            }
        }

学生类

package Com;
/*
   ------------欢迎来到学生管理系统------------
   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
   请输入您的选择
 */
public class Student {
    private String name;
    private String sid;//学号
    private String age;
    private String address;//居住地

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSid() {
        return sid;
    }

    public void setSid(String sid) {
        this.sid = sid;
    }

    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;
    }
}