代码如下：
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public ChangeTable() {
        this.tableModel = new DefaultTableModel(this.userInfo, this.titles);
        this.table = new JTable(this.tableModel);
        JScrollPane scr = new JScrollPane(this.table);
        JPanel toolBar = new JPanel();
        toolBar.add(this.addRowBtn);
        toolBar.add(this.removeRowBtn);
        toolBar.add(this.addColBtn);
        toolBar.add(this.removeColBtn);
        frame.add(toolBar, BorderLayout.NORTH); // 加入组件
        frame.add(scr, BorderLayout.CENTER); // 加入组件
        frame.pack();
        frame.setVisible(true);
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(1);
            }
        });
        this.addRowBtn.addActionListener(this);
        this.removeRowBtn.addActionListener(this);
        this.addColBtn.addActionListener(this);
        this.removeColBtn.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == this.addRowBtn) {
            //this.tableModel.addRow(new Object[] {});
            this.tableModel.setRowCount(tableModel.getRowCount()+1);    //这个和上一行的同样完成了加一行的功能，有什么区别？同理删除行使用这行
                                                                                      的类似代码内存上是否真的删除了？
        }
        }
    }