Get a Node's Parent in a JTree with Java

Let’s say we want the parent of a node, then use the getParent() method -

node3.getFirstChild()

You can also get the parent of child node. Here, “nine” is the child node −

nine.getParent()

The output is as follows displaying this node’s parent on Console −

Example

package my;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
public class SwingDemo {
   public static void main(String[] args) throws Exception {
      JFrame frame = new JFrame("Demo");
      DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products");
      DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing (Product1 - P66778)");
      DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories (Product2 - P66779)");
      DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor (Product3 - P66780)");
      DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Electronics (Product4 - P66781)");
      node.add(node1);
      node.add(node2);
      node.add(node3);
      node.add(node4);
      DefaultMutableTreeNode one = new DefaultMutableTreeNode("Shirt");
      DefaultMutableTreeNode two = new DefaultMutableTreeNode("T-shirt");
      DefaultMutableTreeNode three = new DefaultMutableTreeNode("Hoodie");
      DefaultMutableTreeNode four = new DefaultMutableTreeNode("Sunglasses");
      DefaultMutableTreeNode five = new DefaultMutableTreeNode("Frames");
      DefaultMutableTreeNode six = new DefaultMutableTreeNode("Belts");
      DefaultMutableTreeNode seven = new DefaultMutableTreeNode("Showpieces & Figurines");
      DefaultMutableTreeNode eight = new DefaultMutableTreeNode("Clocks");
      DefaultMutableTreeNode nine = new DefaultMutableTreeNode("Wall Shelves");
      DefaultMutableTreeNode ten = new DefaultMutableTreeNode("Mobile Accessories");
      DefaultMutableTreeNode eleven = new DefaultMutableTreeNode("Smart Wearable Tech");
      DefaultMutableTreeNode twelve = new DefaultMutableTreeNode("Health Care Applicances");
      DefaultMutableTreeNode thirteen = new DefaultMutableTreeNode("Smart Home Automation");
      node1.add(one);
      node1.add(two);
      node1.add(three);
      node2.add(four);
      node2.add(five);
      node2.add(six);
      node3.add(seven);
      node3.add(eight);
      node3.add(nine);
      node4.add(ten);
      node4.add(eleven);
      node4.add(twelve);
      node4.add(thirteen);
      JTree tree = new JTree(node);
      for (int i = 0; i < tree.getRowCount(); i++) {
         tree.expandRow(i);
      }
      tree.putClientProperty("JTree.lineStyle", "Angled");
      System.out.println("Node 3 = "+node.getChildAt(2));
      System.out.println("The last child of node 3 = "+node3.getLastChild());
      System.out.println("Parent of node3 = "+node3.getParent());
      System.out.println("Parent of child node nine = "+nine.getParent());
      tree.setRowHeight(25);
      frame.add(tree);
      frame.setSize(600,450);
      frame.setVisible(true);
   }
}

The output is as follows displaying this node’s parent −

Output

The following is our JTree −