Java Reference
In-Depth Information
A
NSWERS
TO
S
ELF
-T
EST
Q
UESTIONS
1.
Yes. The fields
left
and
right
of
BinaryNode
(see Segment 24.3) have
BinaryNode<T>
as their data type, but the
return type of the method
copy
is
BinaryNodeInterface<T>
.
2.
No. Setting
rightTree
to
null
affects only the local copy of the reference argument
rightTree
. An analogous
comment applies to
leftTree
.
3.
The data in the objects
d
,
b
,
e
,
a
,
f
,
g
, and
c
is displayed on separate lines.
4. public void
preorderTraverse()
{
preorderTraverse(root);
}
// end preorderTraverse
private void
preorderTraverse(BinaryNodeInterface<T> node)
{
if
(node !=
null
)
{
System.out.println(node.getData());
preorderTraverse(node.getLeftChild());
preorderTraverse(node.getRightChild());
}
// end if
}
// end preorderTraverse
5.
You must cast to
BinaryNode<T>
three times, as follows:
•
BinaryNode<T> currentNode = (BinaryNode<T>)root;
•
currentNode = (BinaryNode<T>)currentNode.getLeftChild();
•
currentNode = (BinaryNode<T>)nextNode.getRightChild();
6.
27.
7.
Carole
Brett
Susan
Jennifer
Jared
Brian
Jamie
