System.out.print( value + " " );
tree.insertNode( value );
} // end for
System.out.println ( "\n\nPreorder traversal" );
tree.preorderTraversal(); // perform preorder traversal of tree
System.out.println ( "\n\nInorder traversal" );
tree.inorderTraversal(); // perform inorder traversal of tree
System.out.println ( "\n\nPostorder traversal" );