Init commit java

[mj-ameer]

No description provided.

[super30admin]

The student's solution demonstrates a good understanding of basic data structures (stack and linked list) and their implementations. Here's a detailed evaluation:

Strengths:

1. Correctness:
   • The stack implementations (both array-based and linked list-based) correctly handle push, pop, and peek operations with proper edge case checks.
   • The linked list implementation correctly handles insertion at the end and traversal.
2. Time Complexity:
   • The student has correctly identified and documented the time complexities for all operations.
3. Space Complexity:
   • The space complexity analysis is accurate for all implementations.
4. Code Structure:
   • The code is well-organized with proper class and method separation.
   • Comments are generally helpful and explain the logic.

Areas for Improvement:

1. Error Handling:
   • In the stack implementations, returning 0 for underflow might be ambiguous (what if 0 is a valid stack element?). Consider throwing an exception instead.
2. Code Duplication:
   • The underflow message is duplicated in pop() and peek() methods. Could be extracted to a helper method.
3. Linked List Implementation:
   • The insert() method takes and returns a LinkedList instance, which is unnecessary since it modifies the list in place. Could be void.
4. Naming Conventions:
   • Variable names like 'a' in the array-based stack could be more descriptive (e.g., 'stackArray').
5. Edge Cases:
   • The linked list implementation could benefit from handling null list input in insert() and printList() methods.