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Suspicious underscore in number literal

Reports decimal number literals that use the underscore numeric separator with groups where the number of digits is not three. Such literals may contain a typo.

This inspection will not warn on literals containing two consecutive underscores. It is also allowed to omit underscores in the fractional part of double and float literals.

Example: int oneMillion = 1_000_0000;

Locating this inspection


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

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 | Numeric issues


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024