Pattern: Implicit default locale
Issue: -
Prefer passing java.util.Locale explicitly than using implicit default value when formatting strings. The default locale is almost always not appropriate for machine-readable text like HTTP headers. For example if locale with tag ar-SA-u-nu-arab is a current default then %d placeholders will be evaluated to numbers consisting of Eastern-Arabic (non-ASCII) digits. java.util.Locale.US is recommended for machine-readable output.
Example of incorrect code:
String.format("Timestamp: %d", System.currentTimeMillis())Example of correct code:
String.format(Locale.US, "Timestamp: %d", System.currentTimeMillis())