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())
}
}
}
你写的按钮计算吧,这个类是一个Applet,其中有一个按钮,这个类本身也是按钮的动作监听器,所以实现了ActionListener 接口用来给按钮调用(也就是 actionPerformed方法),其中的参数e是事件参数,当点击按钮时会发送给按钮使用。e.getSource() == b 就是如果点击是b这个按钮,当监听器给一个按钮使用时没有必要加此判断,e.getSource就是获取发生事件的源对象,比如c = new JButton("点我有次数哦")
f.getContentPane().add(c)
c.setVisible(true)
c.addActionListener(this)
此时又增加了一个按钮,就可以用e.getSource() 判断点击的是哪一个按钮。
建议你把面向对象搞懂在学swing编程吧,很容易看懂的
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