Examlex
The plant cell in the image labeled "b" is in the cell cycle stage
Head Node
The first node in a linked list or tree data structure.
Object
In programming, an object is an instance of a class that contains both data, in the form of fields, and methods, which are functions specific to the class.
NullPointerException
An exception thrown in Java when an application attempts to use an object reference that has the null value, indicating that no object has been assigned to the reference.
Preorder Traversal
A way of traversing a tree data structure where each node is visited before its child nodes in a top-down, left-right manner.
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