Comparison to 'Double.NaN' or 'Float.NaN'

Reports any comparisons to Double.NaN or Float.NaN. Such comparisons are never meaningful, as NaN is not equal to anything, including itself. Use the Double.isNaN() or Float.isNaN() methods instead.

Example:

if (x == Double.NaN) {...}

After the quick-fix is applied:

if (Double.isNaN(x)) {...}

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.

ComparisonToNaN

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

Availability

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