Use String.isEmpty() when applicable in java.base

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        Patterns like string.length() == 0, string.length() != 0, string.length() > 0 and "".equals(string) are common, especially in older code. Replace with isEmpty when applicable (always for string.length() ==/!=/> 0, when string can't be null for "".equals(string)

              Assignee:
              Claes Redestad
              Reporter:
              Claes Redestad
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