I have 2 windows. one got an empty JList and the other one got a button. So I want to add the value to the list whenever I press the button. Here is my code but not completed:
Window 1
final DefaultListModel<String> favouriteNames = new DefaultListModel<String>();
JList namesList = new JList(favouriteNames);
Window 2
public class button extends JFrame {
private JList namesList;
private DefaultListModel<String> favouriteNames;
this.namesList = namesList;
JButton addThis = new JButton("Add");
addThis.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
favouriteNames.addElement("Jack");
}
});
}
}
Pass an instance of your DefaultListModel to Window 2 in the constructor.
Edited to add: Here's how you pass an instance in a constructor.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class ButtonFrame implements Runnable {
private JFrame frame;
private DefaultListModel favouriteNames;
public ButtonFrame(final DefaultListModel favouriteNames) {
this.favouriteNames = favouriteNames;
}
@Override
public void run() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton addThis = new JButton("Add");
addThis.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
favouriteNames.addElement("Jack");
}
});
frame.add(addThis);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new ButtonFrame(new DefaultListModel()));
}
}
I made a simpler version of my program, but still have a problem, I believe the ActionPerformed sends the data but the JList does not recognise it or or basically did not expect to receive it. So here is what I have done so far. So it is a bit more of my research and attempts, maybe it gives more details about the problem.
Main Window:
public class main {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame frame = new ClassA();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
ClassA:
public class ClassA extends JFrame {
DefaultListModel<String> myList;
JList list;
public ClassA() {
setSize(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2,1));
myList = new DefaultListModel<String>();
list = new JList(myList);
//ClassB sendsText = new ClassB(myList, list);
JButton find = new JButton("Find");
find.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
new ClassB().setVisible(true);
}
});
add(panel);
panel.add(find);
panel.add(list);
}
}
ClassB:
public class ClassB extends JFrame {
DefaultListModel<String> myList;
JList list;
public ClassB(DefaultListModel<String> myList, JList list){
this.myList = myList;
this.list = list;
}
public ClassB() {
setSize(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2,1));
JButton addMe = new JButton("Add Me");
addMe.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
myList.addElement("Danial");
}
});
add(panel);
panel.add(addMe);
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.