简单的java学生管理系统
来源:互联网 发布:淘宝省市区街道联动 编辑:程序博客网 时间:2024/05/16 23:47
java简单的学生管理系统(无界面)
<span style="font-size:14px;">package Students;public class Students { private String Name; private long Number; private String Class; private int Score;//不将数据域定义为私有的,定义为共有的,将使编写代码变得简单一些,可以省去很多方法 public Students(){ this("sdiuf h",6544534,"ef esf",48);//无意义 } public Students(String Name,long Number,String Class){ this(Name,Number,Class,0);//主要是想尝试一下this引用本类 } public Students(String Name,long Number,String Class,int Score){ this.Name = Name; this.Number = Number; this.Score = Score; this.Class = Class; } public void SetName(String Name){ this.Name = Name; } public void SetNumber(long Number){ this.Number = Number; } public void SetClass(String Class){ this.Class = Class; } public void SetScore(int Score){ this.Score = Score; } public String GetName(){ return Name; } public long GetNumber(){ return Number; } public String GetClass(){ return Class; } public int GetScore(){ return Score; } }</span>
<span style="font-size:14px;"><pre name="code" class="java">package Students;import java.util.Scanner;import java.io.*;public class MainStudents { static int i = 0; public static void main(String[] args) throws FileNotFoundException, IOException, Exception{ Scanner Input = new Scanner(System.in); int choose; do{ System.out.println("--------------【1】、新建学生数据库----------------"); System.out.println("--------------【2】、增添学生数据------------------"); System.out.println("--------------【3】、删除学生数据------------------"); System.out.println("--------------【4】、修改学生数据------------------"); System.out.println("--------------【5】、查看学生数据------------------"); System.out.println("--------------【6】、显示所有学生数据---------------"); System.out.println("--------------【0】、退出应用----------------------"); choose = Input.nextInt(); switch(choose){ case 1: Students1(); break; case 2: Students2(); break; case 3: Students3(); break; case 4: Students4(); break; case 5: Students5(); break; case 6: Students6(); break; case 0: Students0(); break; default: System.out.println("你输入的信息有误,请重新输入!"); } }while(choose != 0); } private static void Students1() throws FileNotFoundException{ Students[] stu = new Students[100];//这里只输入一组数据,可以不用对象数组,而直接用Students类 Scanner Input = new Scanner(System.in); stu[i] = new Students(); System.out.println("请输入学生的班级:");//以String类储存汉字,可能会出现乱码的情况 stu[i].SetClass(Input.next()); System.out.println("请输入学生的学号:"); stu[i].SetNumber(Input.nextLong()); System.out.println("请输入学生的姓名:"); stu[i].SetName(Input.next()); System.out.println("请输入学生的成绩:"); stu[i].SetScore(Input.nextInt()); System.out.println(stu[i].GetClass()); File fl = new File("Students.txt"); try (PrintWriter output = new PrintWriter(fl)) { output.print(stu[i].GetName() + "\t"); output.print(stu[i].GetNumber() + "\t"); output.print(stu[i].GetClass() + "\t"); output.println(stu[i].GetScore()); } i++; File Fl = new File("Number.txt"); try(PrintWriter output = new PrintWriter(Fl)){ output.print(i); } } private static void Students2() throws IOException{ Scanner Input = new Scanner(System.in); File Fl = new File("Number.txt"); try (Scanner input = new Scanner(Fl)) { i = input.nextInt(); } try (FileWriter out = new FileWriter("Students.txt",true)) {//以在文件末尾添加数据的方式创建向文件内输入数据的类 System.out.println("请输入学生的姓名"); out.write("\t" + Input.next() + "\t"); System.out.println("请输入学生的学号"); out.write(Input.nextLong() + "\t"); System.out.println("请输入学生的班级"); out.write(Input.next() + "\t"); System.out.println("请输入学生的成绩"); out.write(Input.nextInt() + "\n"); } i++; try(PrintWriter output = new PrintWriter(Fl)){ output.print(i); } } private static void Students3() throws Exception{ File Fl = new File("Number.txt"); File fl = new File("Students.txt"); try (Scanner input = new Scanner(Fl)) { i = input.nextInt(); } System.out.println("请输入你想修改学生的学号"); Scanner input = new Scanner(System.in); long Number = input.nextLong(); Students[] stu = new Students[i]; try(Scanner Input = new Scanner(fl)){ for(int j =0;j < i;j++){ stu[j] = new Students();//要先将对象数组初始化 stu[j].SetName(Input.next());//不能使用nextLine(),此为输入以\n为结尾的所有数 stu[j].SetNumber(Input.nextLong()); stu[j].SetClass(Input.next()); stu[j].SetScore(Input.nextInt()); if(Number == stu[j].GetNumber()){ System.out.println("姓名\t学号\t班级\t成绩"); System.out.println(stu[j].GetName() + "\t" + stu[j].GetNumber() + "\t" + stu[j].GetClass() + "\t" + stu[j].GetScore()); System.out.println("你确定删除这组数据?(Y/N)(不区分大小写)"); String choose = input.next(); System.out.println(choose); if("Y".equals(choose)||"y".equals(choose)){//不能使用choose == "y"语句 j--; i--; } } } } try(PrintWriter output = new PrintWriter(Fl)){ output.print(i); } if(i == 0){ try (PrintWriter output = new PrintWriter(fl)) { } } else{ try (PrintWriter output = new PrintWriter(fl)) { for(int j = 0;j < i;j ++){ output.print(stu[j].GetName() + "\t"); output.print(stu[j].GetNumber() + "\t"); output.print(stu[j].GetClass() + "\t"); output.println(stu[j].GetScore()); } } } } private static void Students4() throws FileNotFoundException { File Fl = new File("Number.txt"); File fl = new File("Students.txt"); try (Scanner input = new Scanner(Fl)) { i = input.nextInt(); } System.out.println("请输入你想修改学生的学号"); Scanner input = new Scanner(System.in); long Number = input.nextLong(); Students[] stu = new Students[i]; try(Scanner Input = new Scanner(fl)){ for(int j =0;j < i;j++){ stu[j] = new Students();//要先将对象数组初始化 stu[j].SetName(Input.next());//不能使用nextLine(),此为输入以\n为结尾的所有数 stu[j].SetNumber(Input.nextLong()); stu[j].SetClass(Input.next()); stu[j].SetScore(Input.nextInt()); if(Number == stu[j].GetNumber()){ System.out.println("姓名\t学号\t班级\t成绩"); System.out.println(stu[j].GetName() + "\t" + stu[j].GetNumber() + "\t" + stu[j].GetClass() + "\t" + stu[j].GetScore()); System.out.println("请输入学生新的班级"); stu[j].SetClass(input.next()); System.out.println("请输入学生新的成绩"); stu[j].SetScore(input.nextInt()); } } } try (PrintWriter output = new PrintWriter(fl)) { for(int j = 0;j < i;j ++){ output.print(stu[j].GetName() + "\t"); output.print(stu[j].GetNumber() + "\t"); output.print(stu[j].GetClass() + "\t"); output.println(stu[j].GetScore()); } } } private static void Students5() throws FileNotFoundException { File Fl = new File("Number.txt"); File fl = new File("Students.txt"); try (Scanner input = new Scanner(Fl)) { i = input.nextInt(); } System.out.println("请输入你想查看学生的学号"); Scanner input = new Scanner(System.in); long Number = input.nextLong(); Students[] stu = new Students[i]; try(Scanner Input = new Scanner(fl)){ for(int j =0;j < i;j++){ stu[j] = new Students();//要先将对象数组初始化 stu[j].SetName(Input.next());//不能使用nextLine(),此为输入以\n为结尾的所有数 stu[j].SetNumber(Input.nextLong()); stu[j].SetClass(Input.next()); stu[j].SetScore(Input.nextInt()); if(Number == stu[j].GetNumber()){ System.out.println("姓名\t学号\t班级\t成绩"); System.out.println(stu[j].GetName() + "\t" + stu[j].GetNumber() + "\t" + stu[j].GetClass() + "\t" + stu[j].GetScore()); } } } } private static void Students6() throws FileNotFoundException { File Fl = new File("Number.txt"); File fl = new File("Students.txt"); try (Scanner input = new Scanner(Fl)) { i = input.nextInt(); } Students[] stu = new Students[i]; System.out.println("姓名\t学号\t班级\t成绩"); try(Scanner Input = new Scanner(fl)){ for(int j =0;j < i;j++){ stu[j] = new Students();//要先将对象数组初始化 stu[j].SetName(Input.next());//不能使用nextLine(),此为输入以\n为结尾的所有数 stu[j].SetNumber(Input.nextLong()); stu[j].SetClass(Input.next()); stu[j].SetScore(Input.nextInt()); System.out.println(stu[j].GetName() + "\t" + stu[j].GetNumber() + "\t" + stu[j].GetClass() + "\t" + stu[j].GetScore()); } } } private static void Students0() { System.out.println("你将退出程序!"); }}</span>
为对象数组赋值是可以用此形式代替
stu[j] = new Students(Input.next(),Input.nextLong(),Input.next(),Input.nextInt());
因为在Students类里面已经定义此方法
0 1
- 简单的java学生管理系统
- 简单的java学生管理系统
- 简单的学生管理系统
- 简单的学生管理系统
- 简单的学生管理系统
- 简单的 学生管理系统
- 简单的学生管理系统
- Java 基于MySQL数据库的简单学生管理系统
- 用JAVA实现一个简单的学生管理系统
- 用java实现一个简单的学生管理系统
- java实现简单学生管理系统
- 学生管理系统java简单实现
- 简单学生管理系统
- 简单学生管理系统
- 简单学生管理系统
- 双链表实现简单的学生管理系统
- 一个简单的学生管理系统
- Android简单的学生管理系统
- inline函数出现无法解析的错误
- Sass学习笔记
- 【POJ】[3253]Fence Repair
- p ,np ,npc
- leetcode——237——Delete Node in a Linked List
- 简单的java学生管理系统
- linux基本操作命令
- Android-文本类组件
- 一直更新中
- 遍历Map的四种方法
- 【Android安全】初步认识Drozer
- Linux IPC
- 第四周项目五用递归方法求解
- CF_3A_ShortestPathOfTheKing