Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Get the number of levels above a node in JTree with Java
To get the number of levels above a node, use the getLevel() method. Following is an example for the root node “node” −
node.getLevel()
Note − The value 0 is returned if the node is a root node since there are zero levels above the root node.
For other nodes, get the number of levels above a node as shown below with node3 −
node3.getLevel()
The following is an example to get the number of levels above a node in a JTree −
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("Project");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Domain");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Topics");
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("Management ");
DefaultMutableTreeNode two = new DefaultMutableTreeNode("Finance");
DefaultMutableTreeNode three = new DefaultMutableTreeNode("Networking");
DefaultMutableTreeNode four = new DefaultMutableTreeNode("MIS");
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("Code Formatter 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 root node = " + node.getChildCount());
System.out.println("Depth of Tree = " + node.getDepth());
System.out.println("Count of Tree Leaves(root node) = " + node.getLeafCount());
System.out.println("Count of Tree Leaves(node1) = " + node1.getLeafCount());
System.out.println("Number of levels above root node = " + node.getLevel());
System.out.println("Number of levels above node1 = " + node1.getLevel());
System.out.println("Number of levels above node2 = " + node2.getLevel());
System.out.println("Number of levels above node3 = " + node3.getLevel());
System.out.println("Number of levels above node4 = " + node4.getLevel());
tree.setRowHeight(20);
frame.add(tree);
frame.setSize(600,450);
frame.setVisible(true);
}
}The following is the JTree −
Output
Updated on: 30-Jul-2019
219 Views
Advertisements