package itheima;
//学生类  Alt+Insert 根据自己的需要进行选择

public class Student {
    //成员变量
    private String sid;
   private String name;
    private String age;
    private String address;
    //构造方法
    public Student(){}
    public Student(String sid,String name,String age,String address){
        this.name = name;
        this.age = age;
        this.sid = sid;
        this.address = address;
    }
    //提供get/set方法
    public void setSid(String sid){
        this.sid = sid;
    }
    public String getSid(){
        return sid;
    }
    //提供get/set方法
    public void setName(String name){
      this.name = name;
    }
    public String getName(){
        return name;
    }
    //提供get/set方法
    public void setAge(String age) {
//        if (age < 0 || age > 120) {
//            System.out.println("你给的年龄有误");
//        } else {
//          this.age = age;
//        }
        this.age = age;
    }

    public String getAge() {
        return age;
    }
    //提供get/set方法
    public void setAddress(String address){
        this.address = address;
    }
    public String getAddress(){
        return address;
    }


    public void show(){
        System.out.println(name+","+age);
    }
}

package itheima;

import com.sun.org.apache.xalan.internal.res.XSLTErrorResources_es;
import com.sun.org.apache.xerces.internal.xs.XSIDCDefinition;

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

public class StudentManger {
    public static void main(String[] args) {
        //创建集合对象
        ArrayList<Student>arry = new ArrayList<Student>();
        while(true) {
            //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  退出");
            System.out.println("请输入你的选择：");
            //选择
            Scanner sc = new Scanner(System.in);
            int s = sc.nextInt();
            switch (s) {
                case 1:addStudent(arry);
                    break;
                case 2:deleteStudent(arry);
                    break;
                case 3:updateStudent(arry);
                    break;
                case 4:findSdudent(arry);
                    break;
                case 5:
                    System.exit(0);//JVM推出
            }
        }


    }

    //定义添加学生方法
    public static void addStudent(ArrayList<Student>arry){
        Scanner sc = new Scanner(System.in);

        System.out.println("请输入学号:");
        String sid= sc.nextLine();

        System.out.println("请输入姓名:");
        String name= sc.nextLine();

        System.out.println("请输入年龄:");
        String age= sc.nextLine();

        System.out.println("请输入地址:");
        String address= sc.nextLine();

        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);

        arry.add(s);

        System.out.println("添加学生成功");

    }
    //定义查看学生方法
    public static void findSdudent(ArrayList<Student>arry){
        if (arry.size()==0){
            System.out.println("无学生信息，请添加后再查询");
        }else {
            System.out.println("学号\t\t\t姓名\t\t年龄\t\t居住地");//  \t 就是tab键的意思
            for (int i = 0; i < arry.size(); i++) {
                Student s = arry.get(i);
                System.out.println(s.getSid() + "\t" + s.getName() + "\t\t" + s.getAge() + "岁\t" + s.getAddress());

            }
        }
    }
    //定义删除学生方法
    public static void deleteStudent(ArrayList<Student>arry){
        Scanner sid = new Scanner(System.in);
        System.out.println("请输入要删除学生的学号：");
        for (int i = 0;i < arry.size();i++){
            Student s = arry.get(i);
            if (s.getSid().equals(sid)){
                arry.remove(i);
                break;
            }
        }
        System.out.println("删除学生信息成功");

    }
    //定义修改学生方法
    public  static void updateStudent(ArrayList<Student>arry){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入需要修改的学生学号：");
        String sid = sc.nextLine();
        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("请输入学生新居住地");
        String address = sc.nextLine();

        Student s = new Student();
        s.setAge(age);
        s.setName(name);
        s.setAddress(address);

        for (int i = 0;i < arry.size();i++)
        {
            Student s1 = arry.get(i);
            if (s1.getSid().equals(sid)){
                arry.set(i,s);
                break;
            }

        }
        System.out.println("修改学生成功");

    }
}