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);
}
}
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