// insert 10 random integers from 0-99 in tree
for ( int i = 1; i <= 10; i++ )
{
value = randomNumber.nextInt( 100 );
System.out.print( value + " " );
tree.insertNode( value );
} // end for
System.out.println ( "\n\nPreorder traversal" );
tree.preorderTraversal(); // perform preorder traversal of tree