Unnecessary conversion to 'String'

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()

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

UnnecessaryCallToStringValueOf

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Code style issues

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().

Inspection options

Here you can find the description of settings available for the Unnecessary conversion to 'String' inspection, and the reference of their default values.

Report calls that can be replaced with a concatenation with the empty string: Default value:
Not selected

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection UnnecessaryCallToStringValueOf

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025