List集合实现简易学生管理

题目：

代码：

 package org.wlgzs;

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

 /**
  * @author zsh
  * @company wlgzs
  * @create 2018-11-27 21:42
  * @Describe：用集合实现学生的增删查改
  */
 public class SimpleStudentManage {
     public static List<Student> allStudent = new ArrayList<>();

     //初始化数据用
     static {
         allStudent.add(new Student("","1号","男",,));
         allStudent.add(new Student("","2号","女",,));
         allStudent.add(new Student("","3号","男",,));
     }

     //判断密码
     public boolean login(String password){
         if (password.equals("")){
             return true;
         }else {
             return false;
         }
     }

     //查询所有
     public void findAll(){
         for (Student s :allStudent){
             System.out.println(s);
         }
     }

     //增加学生
     public boolean addStudent(Student student){
         return allStudent.add(student);
     }

     //删除学生
     public boolean deleteStudent(String number){
         for (int i = ;i<allStudent.size();i++){
             if (allStudent.get(i).getNumber().equals(number)){
                 return allStudent.remove(allStudent.get(i));
             }
         }
         return false;
     }

     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
         //判断密码
         System.out.println("请输入密码");
         SimpleStudentManage simpleStudentManage = new SimpleStudentManage();
         if (simpleStudentManage.login(scanner.nextLine())){
             System.out.println("------打印所有--------");
             simpleStudentManage.findAll();
             System.out.println("----------------------");
             //创建两个学生对象
             Student s1 = new Student("","4号","男",,);
             //加入list集合
             if (simpleStudentManage.addStudent(s1)){
                 System.out.println("添加成功");
             }else {
                 System.out.println("添加失败");
             }
             System.out.println("------打印所有--------");
             simpleStudentManage.findAll();
             System.out.println("----------------------");
             //删除
             System.out.println("请输入删除学号");
             if (simpleStudentManage.deleteStudent(scanner.nextLine())){
                 System.out.println("删除成功");
             }else {
                 System.out.println("删除失败");
             }
             System.out.println("------打印所有--------");
             simpleStudentManage.findAll();
             System.out.println("----------------------");
         }
     }
 }

 //学生类
 class Student{
     private String number;  //学号
     private String name;  //名字
     private String sex;  //性别
     private int age;  //年龄
     private int grade;  //班级

     //有参构造器
     public Student(String number, String name, String sex, int age, int grade) {
         this.number = number;
         this.name = name;
         this.sex = sex;
         this.age = age;
         this.grade = grade;
     }

     //无参构造器
     public Student() {
     }

     //get,set方法
     public String getNumber() {
         return number;
     }

     public void setNumber(String number) {
         this.number = number;
     }

     public String getName() {
         return name;
     }

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

     public String getSex() {
         return sex;
     }

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

     public int getAge() {
         return age;
     }

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

     public int getGrade() {
         return grade;
     }

     public void setGrade(int grade) {
         this.grade = grade;
     }

     //重写toString
     @Override
     public String toString() {
         return "Student{" +
                 "number='" + number + '\'' +
                 ", name='" + name + '\'' +
                 ", sex='" + sex + '\'' +
                 ", age=" + age +
                 ", grade=" + grade +
                 '}';
     }
 }