Explanations “Top Java Quiz Questions”

What will be the output of the code?

❌ A. 1
✅ B. 2
❌ C. 3
❌ D. Compilation error
❌ E. Runtime error
❌ F. None of the above

Explanation:
In this code snippet, the processMap method uses the computeIfAbsent method of the Map interface. If the specified key is not already associated with a value (or is mapped to null), this method associates it with the result of the given function.
In this case, the key "Two" is already present in the map with the value 2. Therefore, the computeIfAbsent method does not execute the provided function (k -> k.length()), and it returns the current value associated with the key "Two," which is 2.
Option A might be tempting, but it is incorrect because the computeIfAbsent method doesn't execute the function when the key is already present in the map. Option B is the correct answer, representing the value associated with the existing key "Two."
Options C and D are incorrect as there is no compilation error or runtime exception in this code. The behavior is as expected with the use of the computeIfAbsent method.

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1.1K viewsJan 3, 2024 at 15:34

What will be the output of the code?

❌ A. 1
✅ B. 2
❌ C. 3
❌ D. Compilation error
❌ E. Runtime error
❌ F. None of the above

Explanation:
In this code snippet, the processMap method uses the computeIfAbsent method of the Map interface. If the specified key is not already associated with a value (or is mapped to null), this method associates it with the result of the given function.
In this case, the key "Two" is already present in the map with the value 2. Therefore, the computeIfAbsent method does not execute the provided function (k -> k.length()), and it returns the current value associated with the key "Two," which is 2.
Option A might be tempting, but it is incorrect because the computeIfAbsent method doesn't execute the function when the key is already present in the map. Option B is the correct answer, representing the value associated with the existing key "Two."
Options C and D are incorrect as there is no compilation error or runtime exception in this code. The behavior is as expected with the use of the computeIfAbsent method.

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