UnnecessaryCallToStringValueOf

Reports unnecessary calls to static methods that convert their parameters to a string, e.g. String.valueOf() or Integer.toString(). Such calls are unnecessary when used in string concatenations.

Example:

System.out.println("Number: " + Integer.toString(count));

After the quick-fix is applied:

System.out.println("Number: " + count);

Additionally such calls are unnecessary when used as arguments to library methods that do their own string conversion. Some examples of library methods that do their own string conversion are:

• Classes java.io.PrintWriter, java.io.PrintStream

  • print(), println()

• Classes java.lang.StringBuilder, java.lang.StringBuffer

  • append()

• Class org.slf4j.Logger

  • trace(), debug(), info(), warn(), error()

Use the Report calls that can be replaced with a concatenation with the empty string option to also report cases where concatenations with the empty string can be used instead of a call to String.valueOf().