如何从jtable中删除一行 [英] How to delete a row from jtable
本文介绍了如何从jtable中删除一行的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想更改要删除的按钮的操作。我有这个代码：
package buttonexample;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing。*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
公共类ButtonExample {
public JTable table;
public static void main（String [] args）{
final ButtonExample example = new ButtonExample（）;
javax.swing.SwingUtilities.invokeLater（new Runnable（）{
public void run（）{
example.createAndShowGUI（）;
}
}）;
}
private void createAndShowGUI（）{
JFrame frame = new JFrame（Button Example）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
table = new JTable（new JTableModel（））;
JScrollPane scrollPane = new JScrollPane（table）;
table.setFillsViewportHeight（true）;
TableCellRenderer buttonRenderer = new JTableButtonRenderer（）;
//table.getColumn(\"Button1\").setCellRenderer(buttonRenderer）;
table.getColumn（Button2）。setCellRenderer（buttonRenderer）;
table.addMouseListener（new JTableButtonMouseListener（table））;
frame.getContentPane（）。add（scrollPane，BorderLayout.CENTER）;
frame.getContentPane（）。setPreferredSize（new Dimension（500,200））;
frame.pack（）;
frame.setVisible（true）;
}
公共静态类JTableModel扩展AbstractTableModel {
private static final long serialVersionUID = 1L;
private static final String [] COLUMN_NAMES = new String [] {Id，Stuff，Asdfsdf，Button2};
private static final Class<？> [] COLUMN_TYPES = new Class<？> [] {Integer.class，String.class，String.class，JButton.class};
@Override public int getColumnCount（）{
return COLUMN_NAMES.length;
}
@Override public int getRowCount（）{
return 4;
}
@Override public String getColumnName（int columnIndex）{
return COLUMN_NAMES [columnIndex];
}
@Override public Class<？> getColumnClass（int columnIndex）{
return COLUMN_TYPES [columnIndex];
}
@Override public Object getValueAt（final int rowIndex，final int columnIndex）{
switch（columnIndex）{
case 0：return rowIndex ;
案例1：返回Text for+ rowIndex;
case 2：返回Column for+ rowIndex;
case 3：final JButton button = new JButton（COLUMN_NAMES [columnIndex]）;
button.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent arg0）{
//当点击它时，整行将被删除。
JOptionPane.showMessageDialog（JOptionPane.getFrameForComponent（button），
按钮单击行+ rowIndex）;
}
}）;
返回按钮;
默认值：返回错误;
}
}
}
私有静态类JTableButtonRenderer实现TableCellRenderer {
@Override public Component getTableCellRendererComponent（JTable table，Object value，boolean isSelected，boolean hasFocus，int row，int column）{
JButton button =（JButton）value;
if（isSelected）{
button.setForeground（table.getSelectionForeground（））;
button.setBackground（table.getSelectionBackground（））;
} else {
button.setForeground（table.getForeground（））;
button.setBackground（UIManager.getColor（Button.background））;
}
返回按钮;
}
}
私有静态类JTableButtonMouseListener扩展了MouseAdapter {
私有最终JTable表;
public JTableButtonMouseListener（JTable table）{
this.table = table;
}
public void mouseClicked（MouseEvent e）{
int column = table.getColumnModel（）。getColumnIndexAtX（e.getX（））;
int row = e.getY（）/ table.getRowHeight（）;
if（row< table.getRowCount（）&& row> = 0&& column< table.getColumnCount（）&&
column> = 0）{
Object value = table.getValueAt（row，column）;
if（value instanceof JButton）{
（（JButton）value）.doClick（）;
}
}
}
}
}
但（DefaultTableModel）someTable.getModel（）; model.removeRow（row）; 我无法使它工作，因为表模型没有任何名称，我不知道要命名它。我已经尝试初始化表模型，我得到错误说非静态变量模型不能引用静态上下文。有没有办法删除静态上下文中的行？
解决方案
了解更多详情
这只是个人偏好，但我更喜欢使用工具栏或菜单项和键绑定来提供此支持。表中的按钮看起来如此......过时了 - 恕我直言
I want to change the action of the button to delete. I have this code:
package buttonexample;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
public class ButtonExample {
public JTable table;
public static void main(String[] args) {
final ButtonExample example = new ButtonExample();
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
example.createAndShowGUI();
}
});
}
private void createAndShowGUI() {
JFrame frame = new JFrame("Button Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
table = new JTable(new JTableModel());
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
TableCellRenderer buttonRenderer = new JTableButtonRenderer();
//table.getColumn("Button1").setCellRenderer(buttonRenderer);
table.getColumn("Button2").setCellRenderer(buttonRenderer);
table.addMouseListener(new JTableButtonMouseListener(table));
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.getContentPane().setPreferredSize(new Dimension(500, 200));
frame.pack();
frame.setVisible(true);
}
public static class JTableModel extends AbstractTableModel {
private static final long serialVersionUID = 1L;
private static final String[] COLUMN_NAMES = new String[] {"Id", "Stuff", "Asdfsdf", "Button2"};
private static final Class<?>[] COLUMN_TYPES = new Class<?>[] {Integer.class, String.class, String.class, JButton.class};
@Override public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override public int getRowCount() {
return 4;
}
@Override public String getColumnName(int columnIndex) {
return COLUMN_NAMES[columnIndex];
}
@Override public Class<?> getColumnClass(int columnIndex) {
return COLUMN_TYPES[columnIndex];
}
@Override public Object getValueAt(final int rowIndex, final int columnIndex) {
switch (columnIndex) {
case 0: return rowIndex;
case 1: return "Text for "+rowIndex;
case 2: return "Column for "+rowIndex;
case 3: final JButton button = new JButton(COLUMN_NAMES[columnIndex]);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// When this is clicked the whole row will be deleted.
JOptionPane.showMessageDialog(JOptionPane.getFrameForComponent(button),
"Button clicked for row "+rowIndex);
}
});
return button;
default: return "Error";
}
}
}
private static class JTableButtonRenderer implements TableCellRenderer {
@Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
JButton button = (JButton)value;
if (isSelected) {
button.setForeground(table.getSelectionForeground());
button.setBackground(table.getSelectionBackground());
} else {
button.setForeground(table.getForeground());
button.setBackground(UIManager.getColor("Button.background"));
}
return button;
}
}
private static class JTableButtonMouseListener extends MouseAdapter {
private final JTable table;
public JTableButtonMouseListener(JTable table) {
this.table = table;
}
public void mouseClicked(MouseEvent e) {
int column = table.getColumnModel().getColumnIndexAtX(e.getX());
int row = e.getY()/table.getRowHeight();
if (row < table.getRowCount() && row >= 0 && column < table.getColumnCount() &&
column >= 0) {
Object value = table.getValueAt(row, column);
if (value instanceof JButton) {
((JButton)value).doClick();
}
}
}
}
}
But the (DefaultTableModel)someTable.getModel(); model.removeRow(row); I can't make it work because the table model does not have any name and I don't know what to name it. I have tried initializing a table model and I get error saying non-static variable model cannot be reference to a static context. Is there a way to delete the row in a static context?
解决方案
The example by camickr is probably a more reusable solution, but for the sake of education...
- Rendering of cells is the domain of the view
- Model's should never contain components, especially if you're thinking about rendering them to the screen, this is simply the wrong approach to take...
- You need to set up a
TableCellEditorwhich will act as the means by which you can retrieve notification of the edit actions (mouse click or keypress)
This is a basic example, for simplicity, I've used a DefaultTableModel as it has a nice removeRow method, but conceivably, you could use any TableModel, so long as you provided the means to remove a row and modified by the editor to support it...
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.EventObject;
import javax.swing.AbstractCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.event.CellEditorListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
public class ButtonExample {
public JTable table;
public static void main(String[] args) {
final ButtonExample example = new ButtonExample();
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
example.createAndShowGUI();
}
});
}
private void createAndShowGUI() {
JFrame frame = new JFrame("Button Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
table = new JTable(new ExampleTableModel());
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
table.getColumn("action").setCellRenderer(new ButtonCellRenderer());
table.getColumn("action").setCellEditor(new ButtonCellEditor());
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
public static class ExampleTableModel extends DefaultTableModel {
public ExampleTableModel() {
super(new Object[]{"id", "stuff", "blah", "action"}, 0);
for (int index = 0; index < 10; index++) {
addRow(new Object[]{index, "Text for " + index, "Na na", index});
}
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 3;
}
}
public static class ButtonCellRenderer extends JButton implements TableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value != null) {
setText("Delete row " + value.toString());
} else {
setText("Delete Me");
}
if (isSelected) {
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(UIManager.getColor("Button.background"));
}
return this;
}
}
public static class ButtonCellEditor extends AbstractCellEditor implements TableCellEditor {
private JButton editor;
private Object value;
private int row;
private JTable table;
public ButtonCellEditor() {
editor = new JButton();
editor.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (table != null) {
fireEditingStopped();
TableModel model = table.getModel();
if (model instanceof DefaultTableModel) {
((DefaultTableModel) model).removeRow(row);
}
}
}
});
}
@Override
public boolean isCellEditable(EventObject e) {
return true;
}
@Override
public Object getCellEditorValue() {
return value;
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
this.table = table;
this.row = row;
this.value = value;
if (value != null) {
editor.setText("Delete row " + value.toString());
} else {
editor.setText("Delete Me");
}
if (isSelected) {
editor.setForeground(table.getSelectionForeground());
editor.setBackground(table.getSelectionBackground());
} else {
editor.setForeground(table.getForeground());
editor.setBackground(UIManager.getColor("Button.background"));
}
return editor;
}
}
}
Take a closer look at How to Use Tables for more details
This is just a personal preference, but I prefer to use a toolbar or menu item and key bindings to provide this support. Buttons in a table just seem so...dated - IMHO
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