'String.equals()' can be replaced with 'String.isEmpty()'

Reports equals() being called to compare a String with an empty string. In this case, using .isEmpty() is better as it shows you exactly what you're checking.

Example:

void checkString(String s){
  if ("".equals(s)) throw new IllegalArgumentException();
}

After the quick-fix is applied:

void checkString(String s){
  if (s != null && s.isEmpty()) throw new IllegalArgumentException();
}

"".equals(str) returns false when str is null. For safety, this inspection's quick-fix inserts an explicit null-check when the equals() argument is nullable. Use the option to make the inspection ignore such cases.

Inspection options

Option	Type	Default
Do not report when null-check could be necessary	Checkbox	true

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023