jtable单选
时间: 2023-08-14 14:06:32 浏览: 179
在 JTable 中实现单选功能需要使用 ListSelectionModel 和 SelectionMode。具体步骤如下:
1. 获取表格的选择模型:
```
ListSelectionModel selectionModel = table.getSelectionModel();
```
2. 设置选择模式为单选:
```
selectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
```
3. 监听选择事件,获取选中的行号:
```
selectionModel.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent event) {
if (!event.getValueIsAdjusting()) {
int selectedRow = table.getSelectedRow();
//TODO: 处理选中行的操作
}
}
});
```
通过以上步骤,即可在 JTable 中实现单选功能。
相关问题
怎么设置jtable单选框只能单选
要设置JTable单选框只能单选,需要使用TableCellRenderer和TableCellEditor接口的实现类进行自定义。首先需要创建一个单选的渲染器,可以使用JRadioButton来实现。然后创建一个单选的编辑器,当用户点击单元格时,它将在编辑模式下显示。在实现编辑器时,应将值更改为用户选择的单选按钮的值。
具体实现可以参考以下代码:
```
public class RadioButtonRenderer extends JRadioButton implements TableCellRenderer {
public RadioButtonRenderer() {
setOpaque(true);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value != null) {
setSelected((Boolean) value);
}
return this;
}
}
public class RadioButtonEditor extends DefaultCellEditor implements ItemListener {
private JRadioButton button;
public RadioButtonEditor(JCheckBox checkBox) {
super(checkBox);
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
if (value == null) {
return null;
}
button = (JRadioButton) value;
button.addItemListener(this);
return (Component) value;
}
public Object getCellEditorValue() {
button.removeItemListener(this);
return button;
}
public void itemStateChanged(ItemEvent e) {
super.fireEditingStopped();
}
}
```
然后在使用JTable时,可以直接为需要单选框的列设置渲染器和编辑器即可:
```
DefaultTableModel tm = new DefaultTableModel(new Object[][]{}, new String[]{"Name", "Gender", "Age"});
JTable table = new JTable(tm);
table.getColumnModel().getColumn(1).setCellRenderer(new RadioButtonRenderer());
table.getColumnModel().getColumn(1).setCellEditor(new RadioButtonEditor(new JCheckBox()));
```
这样就可以将JTable的某一列变成单选框,并且只能选择一个选项了。
怎么设置jtable单选框只能单选附上代码和注释
好的,我会根据您的要求进行回答,以下是针对您的问题的解答:
为了使 JTable 单选框只能单选,可以使用 javax.swing.ButtonGroup 类来为单元格渲染器添加单选框,然后将它们添加到同一个组中。这样,同一组中的单选框只有一个可以被选择。
下面是示例代码:
```java
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
public class JTableRadioButton {
public static void main(String[] args) {
JFrame frame = new JFrame("JTable with Radio Button");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultTableModel model = new DefaultTableModel();
model.addColumn("Select");
model.addColumn("Name");
model.addRow(new Object[]{false, "Alice"});
model.addRow(new Object[]{false, "Bob"});
model.addRow(new Object[]{false, "Charlie"});
model.addRow(new Object[]{false, "David"});
JTable table = new JTable(model) {
@Override
public Class getColumnClass(int column) {
return column == 0 ? Boolean.class : Object.class;
}
@Override
public TableCellRenderer getCellRenderer(int row, int column) {
if (column == 0)
return new RadioButtonRenderer();
return super.getCellRenderer(row, column);
}
@Override
public TableCellEditor getCellEditor(int row, int column) {
if (column == 0)
return new RadioButtonEditor(new JCheckBox());
return super.getCellEditor(row, column);
}
};
JScrollPane scrollPane = new JScrollPane(table);
frame.getContentPane().add(scrollPane);
frame.pack();
frame.setVisible(true);
}
static class RadioButtonRenderer implements TableCellRenderer {
private final JPanel panel;
private final JRadioButton button;
public RadioButtonRenderer() {
panel = new JPanel(new BorderLayout());
button = new JRadioButton();
panel.add(button, BorderLayout.CENTER);
panel.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
button.setSelected(value != null && (boolean) value);
return panel;
}
}
static class RadioButtonEditor extends DefaultCellEditor implements ItemListener {
private final JPanel panel;
private final JRadioButton button;
public RadioButtonEditor(JCheckBox checkBox) {
super(checkBox);
panel = new JPanel(new BorderLayout());
button = new JRadioButton();
button.setHorizontalAlignment(SwingConstants.CENTER);
panel.add(button, BorderLayout.CENTER);
panel.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
button.addItemListener(this);
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
button.setSelected(value != null && (boolean) value);
return panel;
}
public Object getCellEditorValue() {
return button.isSelected();
}
public void itemStateChanged(ItemEvent e) {
super.fireEditingStopped();
}
}
}
```
在这个示例中,我们使用了 `RadioButtonRenderer` 类来渲染单元格。该类从 `TableCellRenderer` 接口继承,并使用 `JRadioButton` 来实现单选框。
然后,我们使用 `RadioButtonEditor` 类来编辑单元格。这个类从 `DefaultCellEditor` 继承,并使用 `JCheckBox` 作为基础编辑器,然后将 `JRadioButton` 和 `JCheckBox` 放置在同一个面板中。
最后,我们在 `JTable` 中覆盖 `getColumnClass()` 方法来指定第一列的类型为 `Boolean`,并使用 `getCellRenderer()` 和 `getCellEditor()` 方法来设置单元格渲染器和单元格编辑器。
希望这个代码可以帮助您解决问题!
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