The test codes can be found at: Spring2019/CSE427/Assignment1/src/

1. Objecx X
2. int top
3. ArrayList stackObjects

Objecx X can be null or any valid object. int top can be 0 if stack is empty or 1+ if not. ArrayList stackObjects can have 0 object, or null object or any number of valid objects.

Characteristics of input Object X is whether it is null or not. True if null, i.e: X = null False if any other value, i.e: X = “String”, “0”, “abcd”

Partition b1 b2

Q1: Whether Object X is null or not. true false

Partition b1 b2

Q1: Whether stackObjects has null or not. true false

Partition b1 b2 b3

Q1: Value of the int top. 0 1 2 or more

Parameter b1 b2 X null “abcd”

Parameter b1 b2 stackObjects (null, “abcd”) (“abcd”, “edf”)

Parameter b1 b2 b3 top 0 1 3