逐行解释下面代码:package sec02; import java.io.*; import java.util.*; class Student implements Serializable { private String name; private int id; private int chineseScore; private int mathScore; private int englishScore; public Student(String name, int id) { this.name = name; this.id = id; } public void setChineseScore(int score) { this.chineseScore = score; } public void setMathScore(int score) { this.mathScore = score; } public void setEnglishScore(int score) { this.englishScore = score; } public String getName() { return name; } public int getId() { return id; } public int getChineseScore() { return chineseScore; } public int getMathScore() { return mathScore; } public int getEnglishScore() { return englishScore; } public String setName(String name) { return name; } } public class StudentSystem { private static final String FILE_NAME = "students.dat"; private static List<Student> students = new ArrayList<>(); public static void main(String[] args) { loadStudents(); Scanner scanner = new Scanner(System.in); while (true) { System.out.println("请选择操作:"); System.out.println("1. 添加学生"); System.out.println("2. 查找学生"); System.out.println("3. 更新学生信息"); System.out.println("4. 删除学生"); System.out.println("5. 输入学生成绩"); System.out.println("6. 退出系统"); int choice = scanner.nextInt(); switch (choice) { case 1: addStudent();//添加 break; case 2: findStudent();//寻找 break; case 3: updateStudent();//更新 break; case 4: deleteStudent();//删除
时间: 2023-07-16 19:13:55 浏览: 132
java代码-import java.util.Scanner;
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这段代码是一个简单的学生管理系统,使用了Java的序列化机制来保存和读取学生信息。
首先,代码中使用了Java的输入输出包和工具包:
```java
package sec02;
import java.io.*;
import java.util.*;
```
然后定义了一个学生类`Student`,实现了序列化接口`Serializable`,并有一些属性和方法:
```java
class Student implements Serializable {
private String name;
private int id;
private int chineseScore;
private int mathScore;
private int englishScore;
public Student(String name, int id) {
this.name = name;
this.id = id;
}
public void setChineseScore(int score) {
this.chineseScore = score;
}
public void setMathScore(int score) {
this.mathScore = score;
}
public void setEnglishScore(int score) {
this.englishScore = score;
}
public String getName() {
return name;
}
public int getId() {
return id;
}
public int getChineseScore() {
return chineseScore;
}
public int getMathScore() {
return mathScore;
}
public int getEnglishScore() {
return englishScore;
}
public String setName(String name) {
return name;
}
}
```
接下来是主类`StudentSystem`,其中定义了一个常量`FILE_NAME`,用于指定保存学生信息的文件名。还有一个`List`类型的变量`students`,用于存放所有学生信息。程序中的主要逻辑在`main`方法中,通过一个`while`循环来不断接收用户的操作:
```java
public class StudentSystem {
private static final String FILE_NAME = "students.dat";
private static List<Student> students = new ArrayList<>();
public static void main(String[] args) {
loadStudents();
Scanner scanner = new Scanner(System.in);
while (true) {
System.out.println("请选择操作:");
System.out.println("1. 添加学生");
System.out.println("2. 查找学生");
System.out.println("3. 更新学生信息");
System.out.println("4. 删除学生");
System.out.println("5. 输入学生成绩");
System.out.println("6. 退出系统");
int choice = scanner.nextInt();
switch (choice) {
case 1:
addStudent();
break;
case 2:
findStudent();
break;
case 3:
updateStudent();
break;
case 4:
deleteStudent();
break;
case 5:
inputScore();
break;
case 6:
saveStudents();
System.exit(0);
break;
default:
System.out.println("无效的选择,请重新输入。");
break;
}
}
}
```
其中,`loadStudents`方法用于从文件中读取学生信息,`saveStudents`方法用于将学生信息保存到文件中,`addStudent`方法用于添加一个新学生,`findStudent`方法用于查找学生信息,`updateStudent`方法用于更新学生信息,`deleteStudent`方法用于删除学生信息,`inputScore`方法用于输入学生成绩。
最后,程序中的各个方法实现了相应的功能,有些方法使用了Java的序列化机制来保存和读取学生信息,具体实现可以参考完整代码。
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