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Java Program to count the child of root node in a JTree
Use the getChildCount() method to count the number of root node in a JTree. Here, our root node is “node”. Therefore to count its child node, use −
System.out.println("Number of children of node = " + node.getChildCount());We have displayed the count in the Console as shown above. The following is an example to count the child of root 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("Website");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Videos");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Tutorials");
DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("QA");
DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Tools");
node.add(node1);
node.add(node2);
node.add(node3);
node.add(node4);
DefaultMutableTreeNode one = new DefaultMutableTreeNode("PHP Videos");
DefaultMutableTreeNode two = new DefaultMutableTreeNode("HTML5 Videos");
DefaultMutableTreeNode three = new DefaultMutableTreeNode("Blockchain Videos");
DefaultMutableTreeNode four = new DefaultMutableTreeNode("Java");
DefaultMutableTreeNode five = new DefaultMutableTreeNode("DBMS");
DefaultMutableTreeNode six = new DefaultMutableTreeNode("CSS");
DefaultMutableTreeNode seven = new DefaultMutableTreeNode("MongoDB");
DefaultMutableTreeNode eight = new DefaultMutableTreeNode("Python QA");
DefaultMutableTreeNode nine = new DefaultMutableTreeNode("jQuery QA");
DefaultMutableTreeNode ten = new DefaultMutableTreeNode("Photo Editing Tool");
node1.add(one);
node1.add(two);
node1.add(three);
node2.add(four);
node2.add(five);
node2.add(six);
node2.add(seven);
node3.add(eight);
node3.add(nine);
node4.add(ten);
JTree tree = new JTree(node);
for (int i = 0; i < tree.getRowCount(); i++) {
tree.expandRow(i);
}
tree.putClientProperty("JTree.lineStyle", "Angled");
System.out.println("Number of children of node = " + node.getChildCount());
tree.setRowHeight(25); frame.add(tree);
frame.setSize(600,450);
frame.setVisible(true);
}
}Output
The output is as follows. The Console displays the count of node −
The folowing is the JTree −
Updated on: 30-Jul-2019
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