Explanations “Top Java Quiz Questions”

Which of the following pairs fill in the blanks to output 6?

❌ A. ArrayList and put(1, 6)
❌ B. ArrayList and replace(1, 6)
✅ C. ArrayList and set(1, 6)
❌ D. HashSet and put(1, 6)
❌ E. HashSet and replace(1, 6)
❌ F. HashSet and set(1, 6)
❌ G. The code does not compile with any of these options.

Explanation:
The put() method is used on a Map rather than a List or Set, making options A and D incorrect. The replace() method does not exist on either of these interfaces. Finally, the set method is valid on a List rather than a Set because a List has an index. Therefore, option C is correct.

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670 viewsJan 27, 2022 at 09:50

Which of the following pairs fill in the blanks to output 6?

❌ A. ArrayList and put(1, 6)
❌ B. ArrayList and replace(1, 6)
✅ C. ArrayList and set(1, 6)
❌ D. HashSet and put(1, 6)
❌ E. HashSet and replace(1, 6)
❌ F. HashSet and set(1, 6)
❌ G. The code does not compile with any of these options.

Explanation:
The put() method is used on a Map rather than a List or Set, making options A and D incorrect. The replace() method does not exist on either of these interfaces. Finally, the set method is valid on a List rather than a Set because a List has an index. Therefore, option C is correct.

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