j ava学生管理系统代码

以下是一个基于 Java 的学生管理系统代码示例：

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManagementSystem {
    private ArrayList<Student> students;

    public StudentManagementSystem() {
        students = new ArrayList<Student>();
    }

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(Student student) {
        students.remove(student);
    }

    public void displayAllStudents() {
        for (Student student : students) {
            System.out.println(student);
        }
    }

    public void searchStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter student name: ");
        String name = scanner.nextLine();
        for (Student student : students) {
            if (student.getName().equalsIgnoreCase(name)) {
                System.out.println(student);
                return;
            }
        }
        System.out.println("Student not found!");
    }

    public static void main(String[] args) {
        StudentManagementSystem system = new StudentManagementSystem();

        // Add some students
        system.addStudent(new Student("Alice", "CS", 3.5));
        system.addStudent(new Student("Bob", "Math", 3.0));
        system.addStudent(new Student("Charlie", "Physics", 3.9));

        // Display all students
        System.out.println("All students:");
        system.displayAllStudents();

        // Search for a student
        System.out.println("Search for a student:");
        system.searchStudent();
    }
}

class Student {
    private String name;
    private String major;
    private double gpa;

    public Student(String name, String major, double gpa) {
        this.name = name;
        this.major = major;
        this.gpa = gpa;
    }

    public String getName() {
        return name;
    }

    public String getMajor() {
        return major;
    }

    public double getGpa() {
        return gpa;
    }

    public String toString() {
        return "Name: " + name + ", Major: " + major + ", GPA: " + gpa;
    }
}

在这个示例中，我们创建了一个 `StudentManagementSystem` 类，它可以添加、删除、显示和搜索学生。我们还创建了一个 `Student` 类，它包含学生的名称、专业和 GPA。在 `main` 方法中，我们添加了一些学生并显示了所有学生，然后搜索一个学生。