Java写一个学生管理系统的窗口

好的，以下是一个简单的Java学生管理系统窗口示例代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class StudentManagementSystem extends JFrame implements ActionListener {
    private JTextField tfName, tfId, tfMajor;
    private JButton btnAdd, btnDelete, btnUpdate;
    private JTextArea taDisplay;
    private StudentList studentList;

    public StudentManagementSystem() {
        super("学生管理系统");

        // 初始化学生列表
        studentList = new StudentList();

        // 创建组件
        JLabel lbName = new JLabel("姓名：");
        tfName = new JTextField(10);

        JLabel lbId = new JLabel("学号：");
        tfId = new JTextField(10);

        JLabel lbMajor = new JLabel("专业：");
        tfMajor = new JTextField(10);

        btnAdd = new JButton("添加");
        btnAdd.addActionListener(this);

        btnDelete = new JButton("删除");
        btnDelete.addActionListener(this);

        btnUpdate = new JButton("更新");
        btnUpdate.addActionListener(this);

        taDisplay = new JTextArea(10, 40);
        JScrollPane scrollPane = new JScrollPane(taDisplay);

        // 布局
        JPanel p1 = new JPanel(new FlowLayout());
        p1.add(lbName);
        p1.add(tfName);
        p1.add(lbId);
        p1.add(tfId);
        p1.add(lbMajor);
        p1.add(tfMajor);

        JPanel p2 = new JPanel(new FlowLayout());
        p2.add(btnAdd);
        p2.add(btnDelete);
        p2.add(btnUpdate);

        JPanel p3 = new JPanel(new BorderLayout());
        p3.add(p1, BorderLayout.NORTH);
        p3.add(p2, BorderLayout.CENTER);

        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(p3, BorderLayout.NORTH);
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        // 设置窗口属性
        setSize(500, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnAdd) {
            String name = tfName.getText();
            String id = tfId.getText();
            String major = tfMajor.getText();
            Student student = new Student(name, id, major);
            studentList.add(student);
            tfName.setText("");
            tfId.setText("");
            tfMajor.setText("");
            taDisplay.setText(studentList.toString());
        } else if (e.getSource() == btnDelete) {
            String id = tfId.getText();
            studentList.delete(id);
            tfId.setText("");
            taDisplay.setText(studentList.toString());
        } else if (e.getSource() == btnUpdate) {
            String name = tfName.getText();
            String id = tfId.getText();
            String major = tfMajor.getText();
            Student student = new Student(name, id, major);
            studentList.update(student);
            tfName.setText("");
            tfId.setText("");
            tfMajor.setText("");
            taDisplay.setText(studentList.toString());
        }
    }

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

class Student {
    private String name;
    private String id;
    private String major;

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

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public String getMajor() {
        return major;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setId(String id) {
        this.id = id;
    }

    public void setMajor(String major) {
        this.major = major;
    }

    @Override
    public String toString() {
        return "姓名：" + name + "，学号：" + id + "，专业：" + major + "\n";
    }
}

class StudentList {
    private java.util.List<Student> students;

    public StudentList() {
        students = new java.util.ArrayList<>();
    }

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

    public void delete(String id) {
        for (Student student : students) {
            if (student.getId().equals(id)) {
                students.remove(student);
                break;
            }
        }
    }

    public void update(Student student) {
        for (Student s : students) {
            if (s.getId().equals(student.getId())) {
                s.setName(student.getName());
                s.setMajor(student.getMajor());
                break;
            }
        }
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        for (Student student : students) {
            sb.append(student.toString());
        }
        return sb.toString();
    }
}

以上代码实现了一个简单的学生管理系统窗口，包括添加、删除、更新和显示学生信息的功能。当用户点击添加、删除或更新按钮时，程序将根据用户输入的信息执行相应的操作，并更新学生列表和显示区域。