java-控制台-学生管理系统(基础阶段)

package com.zhang.test;

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

/**
 * @author zph
 * @version 1.0
 */
public class StudentSystem {
    // 学生信息容器
    public static ArrayList<Student> studentList = new ArrayList<>();
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        // 标记变量，用来退出系统
        boolean flag = true;
        while(flag){
            // 生成主面板
            masterPanel();
            // 录入用户输入数据
            int input = s.nextInt();
            // 检查用户录入数据
            check(input);
            switch (input){
                // 添加学生
                case 1:
                    boolean flag1 = addStudent(s);
                    if (!flag1){
                        System.out.println("添加学生的id重复,请重新输入!");
                        break;
                    }
                    System.out.println("添加学生信息成功!");
                    break;
                // 删除学生
                case 2:
                    while (true){
                        System.out.println("请输入你要删除学生的id:");
                        String id = s.next();
                        boolean boo = deleteStudent(id);
                        if (boo){
                            break;
                        }
                    }
                    break;
                // 修改学生
                case 3:
                    boolean b = updateStudent(s);
                    if (!b){
                        System.out.println("要修改的学生id不存在，请重新输入!");
                        break;
                    }
                    System.out.println("修改学生信息成功!");
                    break;
                // 查询学生
                case 4:
                    selectStudent();
                    break;
                // 退出系统
                case 5:
                    System.out.println("退出系统成功!欢迎下次光临");
//                    System.exit(0);
                    flag = false;
            }
        }
    }

    /**
     * 生成主面板
     */
    public static void masterPanel(){
        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: 退出系统\"");
        System.out.println("\"请输入你的选择:(1-5)\"");
    }

    /**
     * 对用户录入数据进行简单校验
     * @param input
     */
    public static void check(int input){
        if (!(input >=1 && input <= 5)){
            System.out.println("你输入的数据有误,请重新输入!");
        }
    }

    /**
     * 检查id是否重复
     * @param list
     * @param id
     * @return
     */
    public static boolean checkId(ArrayList<Student> list,String id){
        for (Student student : list) {
            if (student.getId().equals(id)){
                return false;
            }
        }
        return true;
    }

    /**
     * 根据学生id找到在集合中的索引
     * @param id
     * @return
     */
   public static int findIndex(String id){
       for (int i = 0; i < studentList.size(); i++) {
           if (studentList.get(i).getId().equals(id)){
               return i;
           }
       }
       return -1;
   }

    /**
     * 添加学生
     * @param s
     * @return
     */
    public static boolean addStudent(Scanner s){
        Student student = new Student();
        System.out.println("请输入学生ID:");
        String id = s.next();
        boolean flag = checkId(studentList, id);
        if (!flag){
            return false;
        }
        student.setId(id);
        System.out.println("请输入学生姓名:");
        String name = s.next();
        student.setName(name);
        System.out.println("请输入学生年龄:");
        int age = s.nextInt();
        student.setAge(age);
        System.out.println("请输入学生的家庭地址:");
        String address = s.next();
        student.setAddress(address);
        studentList.add(student);
        return true;
    }

    /**
     * 查询所有学生信息
     */
    public static void selectStudent(){
        if (studentList.size() == 0){
            System.out.println("当前无学生信息~~~");
        }
        System.out.println("-------------------学生信息表-------------------");
        System.out.println("id\t\t\t\t姓名\t\t\t年龄\t\t\t家庭住址");
        for (Student student : studentList) {
            System.out.println(student.getId()+"\t\t"
                    +student.getName()+"\t\t\t"
                    +student.getAge()+"\t\t\t"
                    +student.getAddress()
            );
        }
    }


    /**
     * 删除学生
     * @param id
     * @return
     */
    public static boolean deleteStudent(String id){
        int index = findIndex(id);
        if (index < 0){
            System.out.println("id不存在，请重新输入要删除学生的id");
            return false;
        }else {
            studentList.remove(index);
            System.out.println("删除学生成功!");
            return true;
        }
    }

    /**
     * 修改学生信息
     * @param s
     * @return
     */
    public static boolean updateStudent(Scanner s){
        Student student = new Student();
        System.out.println("请输入你要修改的学生ID:");
        String id = s.next();
        int index = findIndex(id);
        boolean flag = checkId(studentList, id);
        if (flag){
            return false;
        }
        student.setId(id);
        System.out.println("请输入学生姓名:");
        String name = s.next();
        student.setName(name);
        System.out.println("请输入学生年龄:");
        int age = s.nextInt();
        student.setAge(age);
        System.out.println("请输入学生的家庭地址:");
        String address = s.next();
        student.setAddress(address);
        studentList.set(index,student);
        return true;
    }
}

/**
 * 学生类
 */
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;
    }

    /**
     * 获取
     * @return id
     */
    public String getId() {
        return id;
    }

    /**
     * 设置
     * @param id
     */
    public void setId(String id) {
        this.id = id;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return age
     */
    public int getAge() {
        return age;
    }

    /**
     * 设置
     * @param age
     */
    public void setAge(int age) {
        this.age = age;
    }

    /**
     * 获取
     * @return address
     */
    public String getAddress() {
        return address;
    }

    /**
     * 设置
     * @param address
     */
    public void setAddress(String address) {
        this.address = address;
    }

    public String toString() {
        return "Student{id = " + id + ", name = " + name + ", age = " + age + ", address = " + address + "}";
    }
}