Rule Set: java/strings.html#InefficientEmptyStringCheck
Description:
Since Java 1.6 the String class provides the isEmpty() method which returns true if the string has a length of 0 (JavaDoc). The check for the inefficient empty string check should be extended such that String.trim().isEmpty() triggers a violation, too.
Code Sample demonstrating the issue:
final String str = " test. ";
// the next line should cause a violation of the InefficientEmptyStringCheck but does not
if (str.trim().isEmpty()) {
System.out.println("String is empty");
}
Running PMD through: Maven and Eclipse
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4