Mastering Java: The Ultimate Quiz for 'Thinking in Java

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For an expression 'a?b:c', what must 'a' be?

An integer

A floating point number

A boolean

'a' must be a boolean for the ternary operator to work properly. If 'a' is not a boolean, it will be evaluated as a truthy or falsy value and the wrong option (either b or c) will be returned. Option A and B are incorrect because they are data types that are not boolean. Option D is incorrect because any object will also be evaluated as a truthy or falsy value and the wrong option may be returned.

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Any object

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