How do I create a JList component?
Category: javax.swing, viewed: 2360 time(s).
JList is a component that displays a list of objects and allow user to select one or more items. To create an instance of JList we can pass a vector, an array of objects or a ListModel. In this example we'll passing an array of objects that contains a date, string and numbers as the parameters.
By default the list does not display a scrollbar. To give our JList component a scrollbar we must wrap it with a JScrollPane.
package org.kodejava.example.swing;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Date;
public class CreateJListDemo extends JFrame {
public CreateJListDemo() {
initialize();
}
//
// Initialize the components and configuration of our CreateJListDemo.
//
private void initialize() {
//
// Define the window title, size and the default close operation.
//
this.setTitle("Create JList Demo");
this.setSize(300, 175);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//
// Create an array of arbitrary objects for the JList to display.
//
Object[] data = new Object[] {
new Date(), "One", 1, Long.valueOf("12345"), "Four", "Five"
};
//
// Create an instance of JList and pass data variable as the
// initial content of it. By default the JList does not have a
// scrolling behaviour, so we create a JScrollPane as the container
// for the JList.
//
JList list = new JList(data);
JScrollPane scrollPane = new JScrollPane(list);
//
// Add a button to close the program.
//
JButton button = new JButton("Close");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
//
// Set the panel layout to BorderLayout and place the list on the
// center and the button on the south.
//
this.setLayout(new BorderLayout(5, 5));
getContentPane().add(scrollPane, BorderLayout.CENTER);
getContentPane().add(button, BorderLayout.SOUTH);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new CreateJListDemo().setVisible(true);
}
});
}
}
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