java怎么实现简易的学籍管理系统

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具体内容如下

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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