请教怎么自动隐藏JTABLE里面空白的行和列

import java.io.*;import java.util.*;import java.awt.*;import javax.swing.*;import javax.swing.event.*;import javax.swing.border.*;import javax.swing.table.*;public class Part2 extends JFrame implements TableModelListener{        private DefaultTableModel tableModel;    private JTable tableView;    private String[] columnNames = {"A","B","C","D","E"};    private String[][] records;        private JButton insertRow, deleteRow, save;    private JPanel top,tablePane;        public static void main(String[] args){        EventQueue.invokeLater(new Runnable() {            public void run() {                try {                    Part2 frame = new Part2();                    frame.setVisible(true);                } catch (Exception e) {                    e.printStackTrace();                }            }        });    }    public Part2() {        records = new String[20][5];                //Initialise the JButtons        insertRow = new JButton("Insert Row");        deleteRow = new JButton("Delete Row");        save = new JButton("Save");                //Initialise the top panel        top = new JPanel();        top.add(insertRow);        top.add(deleteRow);        top.add(save);        add("North",top);                records[0][0]="1";        records[0][2]="2";        /*         * Create a JTable view and set its model. The JTable component is         * implicitly registered as a listener of tableModel.         */        tableModel = new DefaultTableModel(records, columnNames);        tableView = new JTable(tableModel);                        // Make each cell selectable.        tableView.setRowSelectionAllowed(false);        /*         * Register listeners (views) with the model.         */        tableModel.addTableModelListener(this);                /* Setup the GUI. */        setupPane(tableView);            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        setBounds(100, 100, 900, 300);    }        private void setupPane(JTable tableView) {        // Create a ScrollPane to hold the JTable        JScrollPane scrollPane = new JScrollPane(tableView);                scrollPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));            add(scrollPane); // Add the ScrollPane to JFrame    }    public void tableChanged(TableModelEvent e) {}}

int rowsNum = calLinesNum("data.txt");        int colsNum = calTokensNum("data.txt");        records = new String[rowsNum][colsNum];                String[] columnNamesView = getColumnNamesView(columnNames,colsNum);