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Add Icon To JTree Nodes Using The UIManager

/ Published in: Java
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This code snippet uses the UIManager to add icons to JTree nodes.

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  1. import java.io.File;    
  2.     import java.net.URL;  
  3.     import javax.swing.UIManager;  
  4.     import javax.swing.JFrame;    
  5.     import javax.swing.JTree;    
  6.     import javax.swing.JScrollPane;    
  7.     import javax.swing.tree.DefaultMutableTreeNode;   
  8.     import javax.swing.tree.TreePath;   
  9.     import javax.swing.JOptionPane;  
  10.     import javax.swing.Icon;  
  11.     import javax.swing.ImageIcon;  
  12.  
  13.  
  14.     class Program extends JFrame{    
  15.  
  16.         public Program(){    
  17.  
  18.             URL resource = getClass().getResource("NodeImage.jpg");  
  19.             Icon icon = new ImageIcon(resource);  
  20.  
  21.             UIManager.put("Tree.closedIcon", icon);  
  22.             UIManager.put("Tree.openIcon", icon);  
  23.             UIManager.put("Tree.leafIcon", icon);  
  24.  
  25.             DefaultMutableTreeNode root = new DefaultMutableTreeNode("Fruits");    
  26.  
  27.             DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Apples");  
  28.             DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Grapes");  
  29.             DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Oranges");  
  30.             DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Bananas");  
  31.  
  32.             root.add(node1);  
  33.             root.add(node2);  
  34.             root.add(node3);  
  35.             root.add(node4);  
  36.  
  37.             JTree tree = new JTree(root);      
  38.             JScrollPane treeView = new JScrollPane(tree);    
  39.  
  40.             this.getContentPane().add(treeView);    
  41.         }    
  42.  
  43.         public static void main(String[] args){      
  44.             Program p = new Program();    
  45.             p.setSize(300,400);    
  46.             p.setVisible(true);    
  47.         }    
  48.     }

URL: http://www.hostprojects.net/snippets/java/141/add-icon-to-jtree-nodes-using-the-uimanager

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