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Numeric cast that loses precision

Reports cast operations between primitive numeric types that may result in precision loss.

Such casts are not necessarily a problem but may result in difficult to trace bugs if the loss of precision is unexpected.


int a = 420; byte b = (byte) a;

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 | Cast

Use the Ignore casts from int to char option to ignore casts from int to char. This type of cast is often used when implementing I/O operations because the read() method of the class returns an int.

Use the Ignore casts from int 128-255 to byte option to ignore casts of constant values (128-255) from int to byte. Such values will overflow to negative numbers that still fit inside a byte.

Inspection options

Here you can find the description of settings available for the Numeric cast that loses precision inspection, and the reference of their default values.

Ignore casts from int to char

Not selected

Ignore casts from int 128-255 to byte

Not selected


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