简易的学籍管理系统

红太狼 2021-09-30 05:04 322阅读 0赞

**一 代码**

import java.awt.*;
    import java.awt.event.*;
    import java.io.*;
    import javax.swing.*;
    
    public class TestStudentManager {
        private int rows = 0;
        private String[][] unit = new String[rows][5];
        private String[] name = {"姓名", "语文", "数学", "外语", "总分"};
        public JTable table;
    
        public static void main( String[] args ) {
            new TestStudentManager();
        }
    
        TestStudentManager() {
    
            JFrame frame = new JFrame("模拟学生管理系统");
            table = new JTable(unit, name);
            JPanel southPanel = new JPanel();
            southPanel.add(new JLabel("添加学生数"));
            JButton calc = new JButton("计算成绩");
            JButton save = new JButton("保存学生信息");
            JTextField input = new JTextField(5);
            southPanel.add(input);
            southPanel.add(calc);
            southPanel.add(save);
            frame.add(new JLabel("欢迎访问学生管理系统"), BorderLayout.NORTH);
            frame.add(southPanel, BorderLayout.SOUTH);
            frame.add(new JScrollPane(table), BorderLayout.CENTER);
            frame.setSize(400, 400);
            frame.setVisible(true);
    
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            input.addActionListener(new ActionListener() {
                public void actionPerformed( ActionEvent e ) {
                    rows = Integer.valueOf(input.getText());
                    unit = new String[rows][5];
                    table = new JTable(unit, name);
                    System.out.println("xx");
                    frame.getContentPane().removeAll();
                    frame.add(new JScrollPane(table), BorderLayout.CENTER);
                    frame.add(southPanel, BorderLayout.SOUTH);
                    frame.add(new JLabel("欢迎访问学生管理系统"), BorderLayout.NORTH);
                    frame.validate();
                    table.setRowHeight(25);
                }
            });
            calc.addActionListener(new ActionListener() {
                public void actionPerformed( ActionEvent e ) {
                    for (int i = 0; i < rows; i++) {
                        double sum = 0;
                        boolean flag = true;
                        for (int j = 1; j <= 3; j++) {
                            try {
                                sum += Double.valueOf(unit[i][j].toString());
                            } catch (Exception ee) {
                                flag = false;
                                table.repaint();
                            }
                            if (flag) {
                                unit[i][4] = "" + sum;
                                table.repaint();
                            }
                        }
                    }
                }
            });
            save.addActionListener(new ActionListener() {
                public void actionPerformed( ActionEvent e ) {
                    try {
                        write();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            });
    
        }
    
        void write() throws IOException {
            File f = new File("学生信息.txt");
            FileWriter fw = new FileWriter(f);
            for (int i = 0; i < 5; i++) {
                fw.write(name[i] + "\t");
            }
            fw.write("\r\n");
            for (int i = 0; i < rows; i++) {
                for (int j = 0; j < 5; j++) {
                    fw.write(unit[i][j] + "\t");
                }
    
                fw.write("\r\n");
            }
            fw.close();
            JOptionPane.showMessageDialog(null, "保存成功，存放至：学生信息.txt");
        }
    }

**二 运行**

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