JTree Open Icon
In this section,
you will learn to open an icon in JTree. That means when you click any
node of a tree, icon will be displayed on the frame.
Program Description:
The following program displays icons when you click the
node of JTree. For this you need an icon to be displayed on the
frame. Program uses the makeIcon() method to create a UIDefaults
and an ImageIcon UIResource for the given specified gif file.The LookAndFeel
plugins these component Finally, the UIManager class keeps the
current look and feel of he given image to be showed, if you click any node of
the tree.
UIManager
:
The UIManager class keeps the current look and
feel and its defaults which are as follows:.
- If the system property swing.defaultlaf is non-null,
the default
look and feel is used .
- If the swing.properties
exist and
contains the swing.defaultlaf key, it uses its value as the
default look and feels
class uses its values..Otherwise
it uses Java look and feel.
Here is the code of this program:
import javax.swing.*;
import javax.swing.JTree;
import java.awt.BorderLayout;
import java.awt.Container;
public class JTreeOpenIcon {
public static void main(String args[]) {
JFrame fm = new JFrame("JTree openIcon frame");
Object iconObject = LookAndFeel.makeIcon(JTreeOpenIcon.class, "world.gif");
UIManager.put("Tree.leafIcon", iconObject);
JTree tree = new JTree();
JScrollPane scrollPane = new JScrollPane(tree);
Container contentPane = fm.getContentPane();
contentPane.add(scrollPane, BorderLayout.CENTER);
fm.setSize(300, 300);
fm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fm.setVisible(true);
}
}
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