java ArrayList简易学生信息管理

非常简单的小项目，复习记录一下吧

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前言

今天再次复习了一下列表的知识，作为javaSE高级部分的开端，特此记录：

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Student类 代码如下：

package com.zwl.进阶.day18;

/**
 * @author Weilei Zhang
 * @create 2021-03-08 22:02
 */
public class Student {
    private String name;
    private int age;
    private String sex;

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                '}';
    }
    public Student(String name, String sex , int age){
        this.name = name;
        this.sex = sex;
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

主代码：

package com.zwl.进阶.day18;

import java.nio.file.attribute.AclEntryFlag;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * @author Weilei Zhang
 * 集合读取学生类对象信息
 * @create 2021-03-08 22:01
 */
public class Demo05 {
    static boolean flag = true;

    public static void main(String[] args) {
        ArrayList<Student> list = new ArrayList<>();
        while(flag){
            select(welcome() , list);
        }
    }

    public static int welcome(){
        System.out.println("****************************");
        System.out.println("欢迎使用学生信息管理系统:");
        System.out.println("1 - 浏览学生信息");
        System.out.println("2 - 添加学生信息");
        System.out.println("3 - 删除学生信息");
        System.out.println("4 - 修改学生信息");
        System.out.println("5 - 退出系统");
        Scanner s = new Scanner(System.in);
        int a = s.nextInt();
        while(a < 1 || a > 5){
            a = s.nextInt();
        }
        return a;
    }

    public static void select(int a , ArrayList<Student> list){
        switch(a){
            case 1:
                showStudentList(list);
                break;
            case 2:
                addStudent(list);
                break;
            case 3:
                delateStudent(list);
                break;
            case 4:
                updateStudent(list);
                break;
            case 5:
                System.out.println("欢迎下次使用...");
                flag = false;
                return;
            default:
                System.out.println("请重新输入...");
                break;
        }
    }

    private static void updateStudent(ArrayList<Student> list) {
        System.out.println("请输入要修改的学生姓名:");
        Scanner s = new Scanner(System.in);
        String name = s.next();
        for(int i = 0 ; i < list.size() ; i++){
            if(list.get(i).getName().equals(name)){
                System.out.println("请输入要新的信息(性别 , 年龄)");
                String sex = s.next();
                int age = s.nextInt();
                list.set(i , new Student(name , sex , age));
            }
        }
    }

    private static void delateStudent(ArrayList<Student> list) {
        System.out.println("请输入要删除的学生的姓名:");
        Scanner s = new Scanner(System.in);
        String name = s.next();
        for(int i = 0 ; i < list.size() ; i++){
            if(list.get(i).getName().equals(name)){
                list.remove(i);
            }
        }
        System.out.println("删除成功...");
    }

    private static void addStudent(ArrayList<Student> list) {
        System.out.println("请输入添加的学生个数:");
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        for(int i = 0 ; i < n ; i++ ){
            System.out.printf("请输入第%d位学生信息(姓名 , 性别 , 年龄)\n" , i + 1);
            String name = s.next();
            String sex = s.next();
            int age = s.nextInt();
            list.add(new Student(name , sex , age));
        }
    }


    public static void showStudentList(ArrayList<Student> list) {
        System.out.printf("%-10s%-8s%-5s\n" , "姓名" , "性别" , "年龄");
        for(Student s : list){
            System.out.printf("|%-10s|%-8s|%-5d\n" , s.getName() , s.getSex() , s.getAge());
        }
    }
}