How to get the number of siblings of this node in a JTree?

Java 8Object Oriented ProgrammingProgramming

To get the count of siblings of this node, use the getSiblingCount() method. Let’s say you have a node with 4 child nodes. Find the sibling of any of this node’s child node. Here, “eight” is the child node −

eight.getSiblingCount());

Note − Remember, a node is it’s own sibling.

The following is an example to get the number of siblings of this node in a JTree −

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("Siblings of node 3's child node eight = "+eight.getSiblingCount());
      tree.setRowHeight(25);
      frame.add(tree);
      frame.setSize(600,450);
      frame.setVisible(true);
   }
}

The output is as follows displaying this node’s count of siblings on Console −

Output

The following is our JTree −

raja
Published on 04-Jun-2019 10:31:39
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