Hi Friend,

Remove the item from the first list after the selection as we have done in the following code:

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CreateJList{
JList list1;
JList list2;
DefaultListModel listModel1,listModel2;
JButton button;
public static void main(String[] args) {
CreateJList jl=new CreateJList();
}
public CreateJList(){
button=new JButton("Add");
listModel1 = new DefaultListModel();
listModel2 = new DefaultListModel();
list2 = new JList(listModel2);
listModel1.addElement("ZEN");
listModel1.addElement("Alto");
listModel1.addElement("Swift");
listModel1.addElement("Centro");
listModel1.addElement("Innova");
listModel1.addElement("Scorpio");
listModel1.addElement("Chevrolet");
listModel1.addElement("Honda City");
list1 = new JList(listModel1);
list1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Object selected[] = list1.getSelectedValues();
for (int i = 0; i <selected.length; i++) {
System.out.println(selected[i]);
listModel1.removeElement(selected[i]);
listModel2.addElement(selected[i]);

}
}
});
JFrame frame = new JFrame("Creating a JList Component");
JPanel panel = new JPanel();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
panel.add(list1);
panel.add(button);
panel.add(list2);
frame.add(panel);
frame.setSize(300,150);
frame.setVisible(true);
}
}

Thanks