我最近在学习Java编程 |21xrx.com

我最近在学习Java编程

2023-06-14 23:27:18 深夜i -- --

Java编程学生管理系统代码例子

我最近在学习Java编程，学到了如何编写学生管理系统，这个系统可以方便管理学生的信息。今天我就来分享一下我的学习心得，希望能对其他想学习Java的朋友有所帮助。

首先，我们需要搭建Java开发环境。我使用的是Eclipse IDE，安装好后就可以开始写代码了。

接下来，需要定义学生信息的类。代码如下：


public class Student {
  private String name;
  private int age;
  private String gender;
  private String major;
  
  public Student(String name, int age, String gender, String major)
    this.name = name;
    this.age = age;
    this.gender = gender;
    this.major = major;
  
  
  public String getName()
    return this.name;
  
  
  public int getAge()
    return this.age;
  
  
  public String getGender()
    return this.gender;
  
  
  public String getMajor()
    return this.major;
  
  
  public void setName(String name)
    this.name = name;
  
  
  public void setAge(int age)
    this.age = age;
  
  
  public void setGender(String gender)
    this.gender = gender;
  
  
  public void setMajor(String major)
    this.major = major;
  
}

在这个类中，我们定义了学生的四个属性：姓名、年龄、性别和专业。然后，使用构造函数和getter/setter方法访问和修改这些属性的值。

然后，我们需要创建一个管理学生信息的类。代码如下：


import java.util.ArrayList;
public class StudentManager {
  private ArrayList
  students;
 
  
  public StudentManager() {
    this.students = new ArrayList
  ();
 
  }
  
  public ArrayList
  getStudents()
 
    return this.students;
  
  
  public void addStudent(Student student) {
    this.students.add(student);
  }
  
  public void removeStudent(Student student) {
    this.students.remove(student);
  }
  
  public void updateStudent(Student student, String name, int age, String gender, String major) {
    student.setName(name);
    student.setAge(age);
    student.setGender(gender);
    student.setMajor(major);
  }
}

这个类中，我们使用了ArrayList来管理学生信息，包括添加、删除和更新学生信息的方法。

最后，我们需要编写一个简单的用户界面来测试我们的学生管理系统。代码如下：


import java.util.Scanner;
public class StudentUI {
  private StudentManager manager;
  private Scanner scanner;
  
  public StudentUI() {
    this.manager = new StudentManager();
    this.scanner = new Scanner(System.in);
  }
  
  public void start() {
    boolean running = true;
    int choice = 0;
    
    while (running) {
      System.out.println("1. Add student");
      System.out.println("2. Remove student");
      System.out.println("3. Update student");
      System.out.println("4. Show all students");
      System.out.println("5. Exit");
      System.out.print("Enter your choice: ");
      
      try {
        choice = scanner.nextInt();
      } catch (Exception e) {
        System.out.println("Invalid choice");
        scanner.next();
        continue;
      }
      
      switch (choice) {
        case 1:
          addStudent();
          break;
        case 2:
          removeStudent();
          break;
        case 3:
          updateStudent();
          break;
        case 4:
          showAllStudents();
          break;
        case 5:
          running = false;
          break;
        default:
          System.out.println("Invalid choice");
          break;
      }
    }
  }
  
  private void addStudent() {
    System.out.print("Enter name: ");
    String name = scanner.next();
    System.out.print("Enter age: ");
    int age = scanner.nextInt();
    System.out.print("Enter gender: ");
    String gender = scanner.next();
    System.out.print("Enter major: ");
    String major = scanner.next();
    
    Student student = new Student(name, age, gender, major);
    manager.addStudent(student);
    
    System.out.println("Student added");
  }
  
  private void removeStudent() {
    System.out.print("Enter name: ");
    String name = scanner.next();
    
    ArrayList
  students = manager.getStudents();
 
    for (int i = 0; i < students.size(); i++) {
      Student student = students.get(i);
      if (student.getName().equals(name)) {
        manager.removeStudent(student);
        System.out.println("Student removed");
        return;
      }
    }
    
    System.out.println("No such student found");
  }
  
  private void updateStudent() {
    System.out.print("Enter name: ");
    String name = scanner.next();
    
    ArrayList
  students = manager.getStudents();
 
    for (int i = 0; i < students.size(); i++) {
      Student student = students.get(i);
      if (student.getName().equals(name)) {
        System.out.print("Enter new name: ");
        String newName = scanner.next();
        System.out.print("Enter new age: ");
        int newAge = scanner.nextInt();
        System.out.print("Enter new gender: ");
        String newGender = scanner.next();
        System.out.print("Enter new major: ");
        String newMajor = scanner.next();
        
        manager.updateStudent(student, newName, newAge, newGender, newMajor);
        
        System.out.println("Student updated");
        return;
      }
    }
    
    System.out.println("No such student found");
  }
  
  private void showAllStudents() {
    ArrayList
  students = manager.getStudents();
 
    for (int i = 0; i < students.size(); i++) {
      Student student = students.get(i);
      System.out.println("Name: " + student.getName());
      System.out.println("Age: " + student.getAge());
      System.out.println("Gender: " + student.getGender());
      System.out.println("Major: " + student.getMajor());
      System.out.println();
    }
  }
}

这个类中，我们创建了一个带有菜单选项的简单界面，可以让用户动态增删改查学生信息。

综上所述，我学习Java编写学生管理系统的经验，希望对大家有所帮助。本文主要包括三个

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