学生信息管理系统V0.1（字符界面、内存中存储数据）【MVC模式】

package cn.edu.ahau.mgc.stu;

public class Student {

private String id;
private String name;
private int age;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

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;
}
}

package cn.edu.ahau.mgc.stu;

import java.util.Iterator;
import java.util.Scanner;
import java.util.Vector;

public class StudentAction {

private Vector<Student> stus = new Vector<Student>();
Scanner sc = new Scanner(System.in);

public void add() {
Student stu = new Student();
System.out.println("请输入学生学号：");
String id = sc.next();
System.out.println("请输入学生姓名：");
String name = sc.next();
System.out.println("请输入学生年龄：");
int age = sc.nextInt();
stu.setId(id);
stu.setName(name);
stu.setAge(age);
this.stus.add(stu);
}

public void showAll() {
Iterator<Student> iter = this.stus.iterator();
this.printHeader();
while (iter.hasNext()) {
Student stu = iter.next();
this.print(stu);
}
this.printFooter();
}

public void printHeader() {
System.out.println("------------------------");
System.out.println("学号/t姓名/t年龄");
System.out.println("------------------------");
}

public void printFooter() {
System.out.println("------------------------");
}

public void print(Student stu) {
System.out.println(stu.getId() + "/t" + stu.getName() + "/t" + stu.getAge());
}

public Student queryById() {
String id = sc.next();
Student stu = null;
Iterator<Student> iter = this.stus.iterator();
while (iter.hasNext()) {
Student queryStu = iter.next();
if (id != null && id.equals(queryStu.getId())) {
stu = queryStu;
break;
}
}
if (stu != null) {
this.printHeader();
this.print(stu);
this.printFooter();
} else {
System.out.println("对不起，没找到您要查找的学生！");
}
return stu;
}

}

package cn.edu.ahau.mgc.stu;

import java.util.Scanner;

public class StudentMgr {

public static void main(String[] args) {
StudentAction sa = new StudentAction();
Scanner sc = new Scanner(System.in);
boolean flag = true;
while (flag) {
showMenu();
int selected = sc.nextInt();
switch(selected) {
case 1 :
sa.add();
break;
case 2 :
sa.showAll();
break;
case 3 :
sa.queryById();
break;
case 4 :
flag = false;
System.out.println("已退出！");
break;
}
}
}

public static void showMenu() {
System.out.println("学生信息管理菜单：");
System.out.println("（1）增加学生信息");
System.out.println("（2）显示所有学生信息");
System.out.println("（3）根据学号查询学生信息");
System.out.println("（4）退出管理");
}

}