Given the Node class (partially shown below), select an expression to complete the isLeaf method, which is designed to return true if the node is a leaf, false otherwise.
A)children.size() == 0
B)children.get(0) == null
C)data == null
D)root == null

Question

Given the Node class (partially shown below), select an expression to complete the isLeaf method, which is designed to return true if the node is a leaf, false otherwise.  
A)children.size() == 0 
B)children.get(0) == null 
C)data == null 
D)root == null

Quizplus · Accepted Answer

If a node is a leaf, it has no children. Therefore, the size of its list of children will be 0. So, the expression children.size() == 0 is the best choice to complete the isLeaf method.

Given the Node Class (Partially Shown Below), Select an Expression