Creating Tree Structure using GWT

This example describes the Basics for building the Tree Structure using GWT. The steps involved in Building the Tree Structure are described below:-

final Label label = new Label("Click the Node to view Tree structure")
Here we are declaring label. Label is a widget that contains text.

Tree Item root = new TreeItem("Vowels")
Creating tree item i.e. creating root for tree.TreeItem is a class. In this an item can be contained within a tree.

root.addItem("a")
This is the method for adding an item to the root of the tree. Here we are adding a to the tree name "root".

Tree t = new Tree()
Tree is a class and it contains a hierarchy of tree items that user can open and close.

Treeexample.java


package org.yournamehere.client;



import com.google.gwt.core.client.EntryPoint;

import com.google.gwt.user.client.ui.Label;

import com.google.gwt.user.client.ui.RootPanel;

import com.google.gwt.user.client.ui.TreeItem;

import com.google.gwt.user.client.ui.Tree;



public class Treeexample implements EntryPoint {

final Label label = new Label("Click the Node to view Tree structure");

public void onModuleLoad() {

  TreeItem root = new TreeItem("Vowels");

  root.addItem("a");

  root.addItem("e");

  root.addItem("i");

  root.addItem("o");

  root.addItem("u");

 TreeItem root1 = new TreeItem("Digits"); 

  root1.addItem("1");

  root1.addItem("2");

  root1.addItem("3");

  root1.addItem("4");

  root1.addItem("5");



  TreeItem item = new TreeItem();

  root.addItem(item);

  root1.addItem(item);

  Tree t = new Tree();

  t.addItem(root);

  t.addItem(root1);

  RootPanel.get().add(label);

  RootPanel.get().add(t);

  }

}

Main.gwt.xml


<?xml version="1.0" encoding="UTF-8"?>

<module>

  <inherits name="com.google.gwt.user.User"/>

  <entry-point class="org.yournamehere.client.Treeexample"/>

  

</module>

Output of the program

Download Source code

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