When you must determine whether a String is empty, it is more efficient to compare its length to 0 than it is to use the equals () method.

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Quizplus · Accepted Answer

This is because checking the length of a String is a simple integer comparison, whereas using the equals() method requires creating a new String object and comparing each character. Therefore, comparing the length to 0 is a quicker and more efficient way to check if a String is empty.

When You Must Determine Whether a String Is Empty, It