学生信息管理系统
（本程序以文本方式存储数据，不通过数组，直接对文件进行操作）
学生类
Student.java
1 public class Student {
2 private String stunumber; //学号
3 private String name; //姓名
4 private int age; //年龄
5 private boolean sex; //性别
6 private double score; //分数
7
8 /***构造方法***/
9 public Student(String num,String name,int age,boolean sex,double score){
10 stunumber = num;
11 this.name = name;
12 this.age = age;
13 this.sex = sex;
14 this.score = score;
15 }
16
17 /***get函数***/
18 public String getNum(){ //取学号
19 return stunumber;
20 }
21 public String getName(){ //取姓名
22 return name;
23 }
24 public int getAge(){ //取年龄
25 return age;
26 }
27 public boolean getSex(){ //取性别
28 return sex;
29 }
30 public double score(){ //取分数
31 return score;
32 }
33
34 /***set函数***/
35 public void setNum(String num){ //设置学号
36 stunumber = num;
37 }
38 public void setName(String name){ //设置姓名
39 this.name = name;
40 }
41 public void setAge(int age){ //设置年龄
42 this.age = age;
43 }
44 public void setSex(boolean sex){ //设置性别
45 this.sex = sex;
46 }
47 public void score(double score){ //设置分数
48 this.score = score;
49 }
50 }
管理类
StudentManager.java
1 import java.io.*;
2 import java.util.Scanner;
3 public class StudentManager {
4
5 /***主函数***/
6 public static void main(String[] args) throws IOException {
7 Scanner in = new Scanner(System.in);
8 while(true){
9 menu();
10 int n = in.nextInt();
11 switch(n){
12 case 1:showStudent();break;
13 case 2:
14 System.out.println("请依次输入学生的学号、姓名、年龄、性别(true/false)、分数：");
15 addStudent(in.next(),in.next(),in.nextInt(),in.nextBoolean(),in.nextDouble());
16 break;
17 case 3:
18 System.out.println("输入要删除的学生的学号：");
19 deleteStudent(in.next());
20 break;
21 case 4:
22 System.out.println("输入要修改的学生的学号，及修改后的姓名、年龄、性别(true/false)、分数：");
23 updateStudent(in.next(),in.next(),in.nextInt(),in.nextBoolean(),in.nextDouble());
24 break;
25 case 5:
26 System.out.println("输入要查询的学生的学号：");
27 selectStudent(in.next());
28 break;
29 }
30 }
31 }
32
33 /***显示菜单***/
34 public static void menu(){
35 System.out.println("**********************************************************");
36 System.out.println(" 石家庄铁道大学信息科学与技术学院");
37 System.out.println(" 学生信息管理系统V2.0");
38 System.out.println("**********************************************************");
39 System.out.println(" 1.遍历输出学生信息；");
40 System.out.println(" 2.新学生信息录入；");
41 System.out.println(" 3.删除学生信息；");
42 System.out.println(" 4.修改学生信息；");
43 System.out.println(" 5.查询学生信息；");
44 System.out.println("**********************************************************");
45 }
46
47 /***显示所有学生信息 ***/
48 public static void showStudent() throws IOException{
49 File file = new File("student.dat");
50 BufferedReader reader = null;
51 reader = new BufferedReader(new FileReader(file));
52 String tempString = null;
53 while ((tempString = reader.readLine()) != null) {
54 System.out.println(tempString);
55 }
56 }
57
58 /***添加学生信息***/
59 public static void addStudent(String stunumber,String name,int age,boolean sex,double score) throws IOException{
60 FileWriter writer = new FileWriter("student.dat",true);
61 String s;
62 if(sex)
63 s = "女";
64 else s = "男";
65 writer.append(stunumber + " " + name + " " + age + " " + s + " " + score + "\r\n");
66 writer.close();
67 System.out.println("添加成功！");
68 }
69
70 /***删除学生信息 ***/
71 public static void deleteStudent(String stunumber) throws IOException{
72
73 StringBuffer all = new StringBuffer();
74 File file = new File("student.dat");
75 String temp;
76 BufferedReader reader = new BufferedReader(new FileReader(file));
77
78 while((temp = reader.readLine()) != null){
79 if(!temp.startsWith(stunumber))
80 all.append(temp + "\r\n");
81 }
82 reader.close();
83
84 BufferedWriter writer = new BufferedWriter(new FileWriter(file));
85 writer.write(all.toString());;
86 writer.close();
87 System.out.println("删除成功！");
88 }
89
90 /***更新学生信息***/
91 public static void updateStudent(String stunumber,String name,int age,boolean sex,double score) throws IOException{
92 StringBuffer all = new StringBuffer();
93 File file = new File("student.dat");
94 String temp,s;
95 if(sex)
96 s = "女";
97 else s = "男";
98 BufferedReader reader = new BufferedReader(new FileReader(file));
99
100 while((temp = reader.readLine()) != null){
101 if(!temp.startsWith(stunumber))
102 all.append(temp + "\r\n");
103 else all.append(stunumber + " " + name + " " + age + " " + s + " " + score + "\r\n");
104 }
105 reader.close();
106
107 BufferedWriter writer = new BufferedWriter(new FileWriter(file));
108 writer.write(all.toString());;
109 writer.close();
110 System.out.println("修改成功！");
111 }
112
113 /***查询学生信息***/
114 public static void selectStudent(String stunumber) throws IOException{
115 File file = new File("student.dat");
116 BufferedReader reader = new BufferedReader(new FileReader(file));
117 String stuLine;
118 while((stuLine = reader.readLine()) != null)
119 {
120 if(stuLine.startsWith(stunumber))
121 {
122 System.out.println(stuLine);
123 return;
124 }
125 }
126 System.out.println("查询结果为空！");
127 }
128 }
时间： 2024-10-10 09:38:28