怎么在jtable的列前面加单选框

您可以使用JRadioButton作为单选框组件，并将其添加到JTable的表头中。具体实现代码如下：

// 创建单选框
JRadioButton radioButton = new JRadioButton();
TableColumn column = table.getColumnModel().getColumn(columnIndex);

// 设置表头单元格的渲染器
column.setHeaderRenderer(new RadioButtonRenderer(radioButton));

// 设置表头单元格的编辑器，实现点击单选框更新数据
column.setCellEditor(new RadioButtonEditor(radioButton));

// 定义表头单元格渲染器
class RadioButtonRenderer implements TableCellRenderer {
    private final JRadioButton radioButton;

    public RadioButtonRenderer(JRadioButton radioButton) {
        this.radioButton = radioButton;
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        if (value != null) {
            radioButton.setSelected(((Boolean) value).booleanValue());
        }
        return radioButton;
    }
}

// 定义表头单元格编辑器
class RadioButtonEditor extends DefaultCellEditor implements ItemListener {
    private final JRadioButton radioButton;

    public RadioButtonEditor(JRadioButton radioButton) {
        super(radioButton);
        this.radioButton = radioButton;
        radioButton.addItemListener(this);
    }

    @Override
    public Object getCellEditorValue() {
        return radioButton.isSelected();
    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        super.fireEditingStopped();
    }
}