JList
JList object shows a list of objects, it allows to add or remove objects from the list.
import javax.swing.*;
import java.awt.event.*;
public class ListExample2
{
ListExample2(){
JFrame f= new JFrame();
final JLabel label = new JLabel();
label.setSize(500,100);
JButton b=new JButton("Show");
b.setBounds(200,150,80,30);
final DefaultListModel l1 = new DefaultListModel<>();
l1.addElement("Honda");
l1.addElement("Yamaha");
l1.addElement("Suzuki");
l1.addElement("Ducati");
final JList list1 = new JList<>(l1);
list1.setBounds(100,100, 75,75);
DefaultListModel l2 = new DefaultListModel<>();
l2.addElement("150cc");
l2.addElement("250cc");
l2.addElement("699cc");
l2.addElement("900cc");
final JList list2 = new JList<>(l2);
list2.setBounds(100,200, 75,75);
f.add(list1); f.add(list2); f.add(b); f.add(label);
f.setSize(450,450);
f.setTitle("JList - demo ");
f.setLayout(null);
f.setLocationRelativeTo(null);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String data = "";
if (list1.getSelectedIndex() != -1) {
data = "Motorbike Brand Selected: " + list1.getSelectedValue();
label.setText(data);
}
if(list2.getSelectedIndex() != -1){
data += ", Engine Capacity Selected: "+list2.getSelectedValue(); ;
label.setText(data);
}
}
});
}
public static void main(String args[])
{
new ListExample2();
}
}
Following program uses DefaultListModel to store objects. In the program how to add new objects and remove object from list is shown.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ListExample
{
ListExample(){
JFrame f= new JFrame();
JButton rbtn = new JButton("Removal");
JButton abtn = new JButton("Addelement");
JTextField tword = new JTextField(10);
DefaultListModel l1 = new DefaultListModel<>();
l1.addElement("One");
l1.addElement("Two");
l1.addElement("Three");
l1.addElement("Four");
JList list = new JList(l1);
list.setBounds(10,10, 75,125);
tword.setBounds(210,110,100,20);
rbtn.setBounds(100,140,100,20);
abtn.setBounds(210,140,100,20);
f.add(list);
f.add(rbtn);
f.add(abtn);
f.add(tword);
f.setSize(400,400);
f.setLayout(null);
f.setTitle("JList - Demo");
f.setLocationRelativeTo(null);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
rbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
l1.remove(0);
}
});
abtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(tword.getText().length()>0){
l1.addElement(tword.getText());
}
}
});
}
public static void main(String args[])
{
new ListExample();
}
}
