用map实现添加学生

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package Zuoye229;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class Test229 {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Map<Integer, Student229> list = new HashMap<>();
  // 增加学生
  while (true) {

   System.out.println("1、增加学生、2显示所以学生、3删除学生、4查找学生、5修改学生、6退出程序");
   int a = new Scanner(System.in).nextInt();
   switch (a) {
   case 1:
    System.out.println("请输入学生的学号");
    int b1 = new Scanner(System.in).nextInt();
    if (!list.containsKey(b1)) {
     System.out.println("请输入学生的姓名");
     String b2 = new Scanner(System.in).next();
     System.out.println("请输入学生的成绩");
     int b3 = new Scanner(System.in).nextInt();
     Student229 s = new Student229(b2, b3);
     list.put(b1, s);
     System.out.println("添加成功");
    }else {
     System.out.println("该学号已经存在添加失败");
    }

    break;
   case 2:
    Set<Integer> d6 = list.keySet();
    for (Integer integer : d6) {
     Student229 st229 = list.get(integer);
     System.out.println("学号" + integer + "," + st229);
    }

    break;
   case 3:
    System.out.println("请输入要删除学生的学号");
    int b4 = new Scanner(System.in).nextInt();
    list.remove(b4);
    System.out.println("删除成功");

    break;
   case 4:
    System.out.println("请输入你要查找的学生学号");
    int b5 = new Scanner(System.in).nextInt();
    Student229 c = list.get(b5);
    if (!list.containsKey(b5)) {
     System.out.println("你输入的学号不存在查找失败");
    } else {
     System.out.println("你要查找的学生学号是" + b5 + c);

    }

    break;
   case 5:
    System.out.println("请输入你要修改的学生学号");
    int b6 = new Scanner(System.in).nextInt();
    Student229 c2 = list.get(b6);
    if (!list.containsKey(b6)) {
     System.out.println("你输入的学号不存在修改失败");
    } else {
     System.out.println("你要修改的学生是" + b6 + c2);
     System.out.println("请输入学生的姓名");
     String i2 = new Scanner(System.in).next();
     System.out.println("请输入学生的成绩");
     int i3 = new Scanner(System.in).nextInt();
     Student229 s2 = new Student229(i2, i3);
     list.put(b6, s2);
     System.out.println("修改成功");

    }

    break;
   case 6:

    return;

   default:
    System.out.println("你输入的数字不在范围内");
    ;
   }

  }

 }
}

用map实现添加学生

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原文地址：http://www.cnblogs.com/shabeizhen/p/5228824.html