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javastringspecial-charactersis-empty

Which strings are empty?

In the JDK documentation it states that the String method isEmpty() is true for any string of length 0.

This is obviously true for the empty string "".

Are there any other string for which this is the case? I have tested line breaks and carriage returns and they have a length. I have not yet tested characters with appended backspaces.

Edit: I appreciate all the additional information in all the good answers below, however I have accepted what I believe is the most direct answer to the question.

Solution

  • A "string of length zero" means that the string contains no characters at all, and that includes invisible, zero-width, etc. Unicode characters.

    Therefore a string whose on-screen representation is completely blank and zero-width is still non-empty if it contains a character.