In this section, you will learn to create a horizontal tree in java.
Adding Horizontal lines to Group Nodes
Introduction
In this section, you will learn to create a horizontal tree in java.
Description of the Program:
This program creates a JTree that contains a root and the nodes.This program implements a class (JTreeHorizontal). Here the init() method creates root and the child nodes through DefaultMutableTreeNode method. These objects are added in the JTree and the putClintProperty() method displays them horizontally in a JTree on the frame.
putclientProperty(Object key, Object val): The clientProperty dictionary is not intended to support large scale extensions to Jcomponent nor should it be considered an alternative to subclassing when designing a new component. It takes following type values:
key: This is the client property key.
val: This is the client
property value.
Here is the code of this program:
import javax.swing.*; import javax.swing.tree.*; import java.awt.*;
public class JTreeHorizontal extends JFrame{ JTree tree;
public JTreeHorizontal(){ super("JTreeHorizontal Frame");
setSize(300, 300); setDefaultCloseOperation(EXIT_ON_CLOSE); }
public void init(){
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode book = new DefaultMutableTreeNode("Book");
DefaultMutableTreeNode javabook = new DefaultMutableTreeNode("Java Book");
DefaultMutableTreeNode jspbook = new DefaultMutableTreeNode("JSP Book");
DefaultMutableTreeNode phpbook = new DefaultMutableTreeNode("PHP Book");
DefaultMutableTreeNode structbook = new DefaultMutableTreeNode("STRUCT Book");
DefaultMutableTreeNode contry = new DefaultMutableTreeNode("CONTRY");
DefaultMutableTreeNode india = new DefaultMutableTreeNode("INDIA");
DefaultMutableTreeNode usa = new DefaultMutableTreeNode("USA");
DefaultTreeModel treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
tree.putClientProperty("JTree.lineStyle", "Horizontal");
treeModel.insertNodeInto(book,root, 0);
treeModel.insertNodeInto(contry,root, 0); book.add(javabook);
book.add(jspbook); book.add(phpbook); book.add(structbook);
contry.add(india); contry.add(usa);
getContentPane().add(tree, BorderLayout.CENTER); }
public static void main(String args[]){
JTreeHorizontal jh = new JTreeHorizontal();
jh.init();
jh.setVisible(true); } }
Output this program:
