import javax.swing.JButton
import javax.swing.JFrame
public class c {
public static void main(String[] args) {
// 你懂的
JFrame jf = new JFrame()
// 你懂的
jf.setSize(300, 400)
// JFrame做为一个画板，他里面可以有控件，有控件就有控件布局的样式，样式为null可以理解为自由布局
jf.setLayout(null)
// JFrame的setVisible的默认值为false,值的意义是是否显示.
jf.setVisible(true)
// 按钮
JButton jb = new JButton("按钮")
// 添加按钮
jf.add(jb)
// 因为上面的布局样式，他设置了x50y80坐标和长100宽30
jb.setBounds(50, 80, 100, 30)
}
}
按照你的要求添加两个按钮的Java程序如下:
package com.sunshine.customerimport java.awt.*
import java.awt.event.*
import javax.swing.*
import javax.swing.table.DefaultTableModel
public class JTableDemo extends JFrame implements ActionListener{
private JPanel topPanel
private JTable table
private JButton addRoom=new JButton("添加房间")
private JButton removeRoom=new JButton("删除房间")
private DefaultTableModel dtm
public JTableDemo(){
setTitle( "Simple JTable Application" )
setSize(560, 400 )
setBackground( Color.gray )
topPanel = new JPanel()
topPanel.setLayout( new BorderLayout() )
getContentPane().add( topPanel )
String cols[] = {"房间号","是否预定","房间价格","房间类型","房间状态","卫生情况","剩余时间"}
String rowData[][] = {{ "", "", "","","","",""},
{ "", "", "","","","",""},{ "", "", "","","","",""},{ "", "", "","","","",""},
{ "", "", "","","","",""},{ "", "", "","","","",""},{ "", "", "","","","",""},
{ "", "", "","","","",""},{ "", "", "","","","",""},{ "", "", "","","","",""},
{ "", "", "","","","",""},{ "", "", "","","","",""},{ "", "", "","","","",""},}
dtm=new DefaultTableModel()
dtm.setDataVector(rowData, cols)
table = new JTable(dtm)
JScrollPane scrollPane = new JScrollPane(table)
topPanel.add( scrollPane, BorderLayout.CENTER )
addRoom.addActionListener(this)
removeRoom.addActionListener(this)
JPanel p=new JPanel()
p.add(addRoom)
p.add(removeRoom)
topPanel.add( p,BorderLayout.SOUTH )
}
public static void main( String args[] ) {
JTableDemo mainFrame = new JTableDemo()
mainFrame.setVisible( true )
}
@Override
public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==addRoom){
String row[]={ "", "", "","","","",""}
dtm.addRow(row)
}
if(ae.getSource()==removeRoom){
dtm.removeRow(table.getSelectedRow())
}
}
}
有时候我们需要在JTable中嵌入JButton，使得点击某个JTable单元格时，用户感觉通过JButton触发了响应事件。下面我们看看为JTable单元格添加按钮效果和响应事件的方法。以下示例实现的效果为：点击jtable中的button，button上的数字自动加1，并将加1后得到的数字正确显示在button上。
一、添加按钮显示效果
JTable中，单元格的数据显示默认是JTable的效果。如果我们想要按钮显示的效果的话，需要实现swing接口：javax.swing.table.TableCellRenderer，来改变单元格默认的渲染方法。
package TableButtonimport java.awt.BorderLayout
import java.awt.Component
import javax.swing.JButton
import javax.swing.JPanel
import javax.swing.JTable
import javax.swing.table.TableCellRenderer
public class MyButtonRenderer implements TableCellRenderer {
private JPanel panel
private JButton button
private int num
public MyButtonRenderer() {
initButton()
initPanel()
panel.add(button, BorderLayout.CENTER)
}
private void initButton() {
button = new JButton()
}
private void initPanel() {
panel = new JPanel()
panel.setLayout(new BorderLayout())
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
num = (Integer) value
button.setText(value == null ? "" : String.valueOf(value))
return panel
}
}
二、添加按钮响应事件
第1步中我们为表格添加了渲染器，但是渲染器只负责显示效果，要想点击”按钮“之后有响应，还得跟单元格的编辑器有关。点击表格是会触发表格的编辑时间，所以我们按钮的响应事件可以写在编辑器中，我们需要修改表格的默认编辑器实现。
swing中有个类javax.swing.DefaultCellEditor提供对单元格内插入JTextField/JComboBox/JCheckbox这3种控件，但是不提供对JButton的支持（1.7里不支持，不代表以后不会支持），所以我们得用到另外一个类自己写TableCellEditor，这个类是avax.swing.AbstractCellEditor。
package TableButtonimport java.awt.BorderLayout
import java.awt.Component
import java.awt.event.ActionEvent
import java.awt.event.ActionListener
import javax.swing.AbstractCellEditor
import javax.swing.JButton
import javax.swing.JOptionPane
import javax.swing.JPanel
import javax.swing.JTable
import javax.swing.table.TableCellEditor
public class MyButtonEditor extends AbstractCellEditor implements
TableCellEditor {
/**
* serialVersionUID
*/
private static final long serialVersionUID = -6546334664166791132L
private JPanel panel
private JButton button
private int num
public MyButtonEditor() {
initButton()
initPanel()
panel.add(this.button, BorderLayout.CENTER)
}
private void initButton() {
button = new JButton()
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int res = JOptionPane.showConfirmDialog(null,
"Do you want to add 1 to it?", "choose one",
JOptionPane.YES_NO_OPTION)
if(res == JOptionPane.YES_OPTION){
num++
}
//stopped!!!!
fireEditingStopped()
}
})
}
private void initPanel() {
panel = new JPanel()
panel.setLayout(new BorderLayout())
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
num = (Integer) value
button.setText(value == null ? "" : String.valueOf(value))
return panel
}
@Override
public Object getCellEditorValue() {
return num
}
}
需要注意的是得重写TableModel的isCellEditable方法，因为只有为重写Editor的列开启了可编辑功能，单元格才能被编辑，也就才能出发按钮单击事件。在下一段代码中有体现。
另外要注意得禁止掉JTable的行选中功能。否则我们再点击按钮时，JTable不知道是响应为”行选中“还是”按钮单击事件“。
三、测试代码
package TableButtonimport java.awt.Color
import java.awt.EventQueue
import javax.swing.JFrame
import javax.swing.JPanel
import javax.swing.JScrollPane
import javax.swing.JTable
import javax.swing.table.DefaultTableModel
public class TestTable {
private JFrame frame
private JTable table
private Object[][] data = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9}}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TestTable window = new TestTable()
window.frame.setVisible(true)
} catch (Exception e) {
e.printStackTrace()
}
}
})
}
public TestTable() {
frame = new JFrame()
frame.setBounds(100, 100, 450, 300)
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
frame.getContentPane().setLayout(null)
JPanel panel = new JPanel()
panel.setBounds(10, 10, 414, 242)
frame.getContentPane().add(panel)
panel.setLayout(null)
JScrollPane scrollPane = new JScrollPane()
scrollPane.setBounds(10, 10, 394, 222)
panel.add(scrollPane)
table = new JTable()
scrollPane.setViewportView(table)
table.setModel(new DefaultTableModel() {
@Override
public Object getValueAt(int row, int column) {
return data[row][column]
}
@Override
public int getRowCount() {
return 3
}
@Override
public int getColumnCount() {
return 3
}
@Override
public void setValueAt(Object aValue, int row, int column){
data[row][column] = aValue
fireTableCellUpdated(row, column)
}
@Override
public boolean isCellEditable(int row, int column) {
if (column == 2) {
return true
} else {
return false
}
}
})
table.getColumnModel().getColumn(2).setCellEditor(
new MyButtonEditor())
table.getColumnModel().getColumn(2).setCellRenderer(
new MyButtonRenderer())
table.setRowSelectionAllowed(false)
}
}
欢迎分享，转载请注明来源：内存溢出
微信扫一扫
支付宝扫一扫
评论列表（0条）