Precourse1-Exercise1

[parthjigneshshah]

Precourse1-Exercise1 changes committed.

[super30admin]

The student's solution implements a basic stack data structure using an array in Java. Here are the key observations:

Strengths:

1. Correctness: The implementation correctly follows the standard stack operations (push, pop, peek, isEmpty) with proper boundary checks.
2. Time Complexity: The student has correctly identified and commented the O(1) time complexity for all operations.
3. Space Complexity: The space complexity is correctly noted as O(MAX) where MAX is the fixed size of the stack.
4. Basic Structure: The code is well-organized into a Stack class with clear method separation.

Areas for Improvement:

1. Error Handling: The pop() and peek() methods return 0 when the stack is empty, which could be ambiguous (since 0 could be a valid stack value). Consider throwing an exception instead.
2. Magic Numbers: The MAX constant is defined but could be made configurable through the constructor for more flexibility.
3. Documentation: While time/space complexity is noted, method-level JavaDoc comments explaining each method's purpose would improve readability.
4. Testing: The main method only tests a basic happy path. More comprehensive test cases (edge cases like empty stack, full stack) would be beneficial.
5. Return Types: The push() method returns a boolean which isn't standard practice for stack implementations - typically push either succeeds or throws an exception.

Suggestions:

1. Consider making the stack size configurable via constructor parameter
2. Use exceptions for stack underflow/overflow cases
3. Add more comprehensive test cases
4. Consider implementing Iterable interface for better usability
5. Add proper JavaDoc comments for each method