ArrayList Student

package JihekuangjiaEXE;

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

public class ArrayListedTest{
    public static void main(String[] args) {
        String name = null;
        int id;
        int age;
        boolean y = true;
        Student stu;
        Scanner input  = new Scanner(System.in);
        ArrayList<Student> arraylist = new ArrayList<Student>();
        do {
            System.out.println("请输入学生学号:");
            id = input.nextInt();
            if(id == 0){
                y = false;
                System.out.println("结束录入.");
                break;
            }
            System.out.println("请输入学生姓名:");
            name = input.next();
            System.out.println("请输入学生年龄:");
            age = input.nextInt();
            stu = new Student(id,name,age);
            arraylist.add(stu);
        } while (y);
        showInfo(arraylist);    //调用输出方法
        
        //修改学员信息
        System.out.println("请输入要修改的学员学号:");
        id = input.nextInt();
        if(id > arraylist.size()){
            System.out.println("对不起，没有该学员!");
        }
        else{
            System.out.println("请输入要修改的学员姓名:");
            name = input.next();
            System.out.println("请输入要修改的学员年龄:");
            age = input.nextInt();
            stu = new Student(id,name,age);
            arraylist.set(id-1, stu);
            showInfo(arraylist);
        }
       
        //删除学员信息
        System.out.println("请输入要删除的学员学号:");
        id = input.nextInt();
        if(id > arraylist.size()){
            System.out.println("对不起，没有该学员!");
        }
        else{
            arraylist.remove(id-1);
            showInfo(arraylist);
        }
        input.close();

    }
    public static void showInfo(ArrayList<Student> arraylist){
        Iterator<Student> it = arraylist.iterator();
        System.out.println("学号\t姓名\t年龄");
        while(it.hasNext()){
            Student a = it.next();
            System.out.println(a.getId()+"\t"+a.getName()+"\t"+a.getAge());
        }

    }
    
}

package JihekuangjiaEXE;


public class Student {
    private String name = null;
    private long id;
    private int age;

    public Student() {
        super();
    }
    public Student(long id, String name, int age) {
        super();
        this.setName(name);
        this.setId(id);
        this.setAge(age);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}