Explanations “Top Java Quiz Questions”

What is the output of the code snippet?

❌ A. [1, 2]
✅ B. [1]
❌ C. [2]
❌ D. []
❌ E. The code does not compile
❌ F. None of the above

Explanation:
Be careful when autoboxing into Integer. It actually outputs [1]. After adding the two values, the List contains [1, 2]. We then request the element with index 1 be removed. That’s right: index 1. Because there’s already a remove() method that takes an int parameter, Java calls that method rather than autoboxing. If you want to remove the 1, you can write numbers.remove(new Integer(1)) to force wrapper class use.

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658 viewsJan 20, 2022 at 13:41

What is the output of the code snippet?

❌ A. [1, 2]
✅ B. [1]
❌ C. [2]
❌ D. []
❌ E. The code does not compile
❌ F. None of the above

Explanation:
Be careful when autoboxing into Integer. It actually outputs [1]. After adding the two values, the List contains [1, 2]. We then request the element with index 1 be removed. That’s right: index 1. Because there’s already a remove() method that takes an int parameter, Java calls that method rather than autoboxing. If you want to remove the 1, you can write numbers.remove(new Integer(1)) to force wrapper class use.

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