Java tutorial
import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.LookAndFeel; import javax.swing.UIManager; public class LookAndFeelMakeIcon { public static void main(String args[]) { JFrame frame = new JFrame("Lazy Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Object iconObject = LookAndFeel.makeIcon(LookAndFeelMakeIcon.class, "yourFile.gif"); UIManager.put("Tree.leafIcon", iconObject); JTree tree = new JTree(); JScrollPane scrollPane = new JScrollPane(tree); frame.add(scrollPane, BorderLayout.CENTER); frame.setSize(200, 200); frame.setVisible(true); } }