Java - Object-Oriented Programming Concepts
In real-world modeling with Java classes, what happens if two keys are duplicated in a dictionary-like structure (e.g., Map)?
In real-world modeling with Java classes, what happens if two keys are duplicated in a dictionary-like structure (e.g., Map)?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Map behavior with duplicate keys
Maps store unique keys; adding a duplicate key replaces the old value.Step 2: Confirm no automatic list storage or errors
Maps do not store multiple values per key automatically; no compile error occurs.Final Answer:
The last value assigned to the duplicate key overwrites the previous -> Option BQuick Check:
Duplicate keys overwrite previous values [OK]
Quick Trick: Map keys are unique; last put wins [OK]
Common Mistakes:
- Expecting multiple values per key
- Thinking duplicates cause errors
- Assuming first value stays
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