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Negative int hexadecimal constant in long context

Reports negative int hexadecimal constants in long context. Such constants are implicitly widened to long, which means their higher bits will become 1 rather than 0 (e.g., 0xFFFF_FFFF will become 0xFFFF_FFFF_FFFF_FFFFL). Unlikely this is intended, and even if it is, using an explicit long constant would be less confusing.

Example:

// Warning: this is int constant -1 which is widened to long // becoming 0xFFFF_FFFF_FFFF_FFFFL. long mask = 0xFFFF_FFFF;

Locating this inspection

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

NegativeIntConstantInLongContext
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Settings or Preferences | Editor | Inspections | Java | Numeric issues

New in 2022.3

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 NegativeIntConstantInLongContext

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

Inspection Details

By default bundled with:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025