Java Program to get the previous node from a JTree

Use the getPreviousNode() method to get the previous node of this node in Java. Here, we are displaying the previous node of child node “eight” −

System.out.println("Get Previous Node = "+eight.getPreviousNode());

The following is an example to get the previous node from 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("Get Previous Leaf = "+eight.getPreviousLeaf());       System.out.println("Get Previous Leaf = "+node3.getPreviousLeaf());       System.out.println("Get Previous Node = "+eight.getPreviousNode());       System.out.println("Get Previous Node = "+node3.getPreviousNode());       tree.setRowHeight(25);       frame.add(tree);       frame.setSize(600,450);       frame.setVisible(true);    } }

The output is as follows displaying the previous node −

The following is our JTree −