How do I get the items of a JList components?
Category: javax.swing, viewed: 2371 time(s).
In this example you can see how we can read the items of a JList component. We also obtain the size or the number of items in the JList components.
This can be done by calling JList's getModel() method which return a ListModel object. From the ListModel we can get the items size and we can iterate the entire items of the JList component.
package org.kodejava.example.swing;
import javax.swing.*;
import java.awt.*;
import java.text.DateFormatSymbols;
public class JListGetItems extends JFrame {
public JListGetItems() {
initialize();
}
private void initialize() {
//
// Configure the frame default close operation, its size and the
// layout.
//
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(300, 300);
this.setLayout(new BorderLayout(5, 5));
//
// Create a JList and set the items to the available weekdays
// names.
//
Object[] listItems = DateFormatSymbols.getInstance().getWeekdays();
JList list = new JList(listItems);
getContentPane().add(list, BorderLayout.CENTER);
//
// Below we start to print the size of the list items and iterates
// the entire list items or elements.
//
System.out.println("JList item size: " + list.getModel().getSize());
System.out.println("Reading all list items:");
System.out.println("-----------------------");
for (int i = 0; i < list.getModel().getSize(); i++) {
Object item = list.getModel().getElementAt(i);
System.out.println("Item = " + item);
}
}
public static void main(String[] args) {
//
// Run the program, create a new instance of JListGetItems and
// set its visibility to true.
//
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new JListGetItems().setVisible(true);
}
});
}
}
And here is the result:
JList item size: 8
Reading all list items:
-----------------------
Item =
Item = Sunday
Item = Monday
Item = Tuesday
Item = Wednesday
Item = Thursday
Item = Friday
Item = Saturday
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