我是swing java的新手,我制作了一组jtoggle按钮,我的问题是我想限制4个切换按钮的选定(切换)按钮的数量。是否有任何财产可以让我这样做?这是我的代码示例。
package adad;
import java.awt.*; import java.awt.event.*;
import javax.swing.*;
public class essayer extends JFrame
{
private JToggleButton jb_essai[] = new JToggleButton[6];
JButton pressme = new JButton("Press Me");
essayer() // the frame constructor
{
super("Toggle boutons");
setBounds(100,100,300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container con = this.getContentPane();
JPanel pane = getContainer();
con.add(pane);
setVisible(true);
}
class ToggleAction implements ActionListener
{
private JToggleButton jb_essai[];
public ToggleAction(JToggleButton a_jb_essai[])
{
jb_essai = a_jb_essai;
}
public void actionPerformed(ActionEvent e)
{
String etatBoutons = "";
int size = jb_essai.length;
for(int i=0;i<size;i++)
{
String tmp = "Bouton "+(i+1)+" : ";
if(jb_essai[i].isSelected()==true )
{
tmp+="enfonce";
}
else
{
tmp+="relache";
}
tmp+="\n";
etatBoutons +=tmp;
}
System.out.println(etatBoutons+"\n---------");
}
}
private JPanel getContainer()
{
GridLayout thisLayout = new GridLayout(6,2);
JPanel container = new JPanel();
ToggleAction tga = new ToggleAction(jb_essai);
container.setLayout(thisLayout);
int j=6;
for (int i=0;i<j;i++)
{
String s = String.valueOf(i+1);
container.add(jb_essai[i]= new JToggleButton(s)); // actuellement tt s'affiche sur un même colone.
jb_essai[i].addActionListener(tga);
}
return container;
}
public static void main(String[] args) {new essayer();}
}