Mastering Java: The Ultimate Quiz for 'Thinking in Java' 2025 - Free Java Programming Practice Questions and Study Guide

Question: 1 / 510

What does the List<?> declaration imply about the List's element type?

The list can hold elements of any subtype of Object

The list can only hold elements of the class List

The element type is unknown and could be anything

A Option A is incorrect because the List does not necessarily hold objects of any subtype of Object. The wildcard "?" in the List<?> declaration does not necessarily extend Object.

B: Option B is incorrect because the List does not necessarily hold elements of the class List. The wildcard "?" in the List<?> declaration does not necessarily extend List.

D: Option D is incorrect because the List is not of a specific generic type determined at runtime. The wildcard "?" in the List<?> declaration means that the element type is unknown and can vary.

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The list is of a specific generic type determined at runtime

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