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Implicit numeric conversion

Reports implicit conversion between numeric types.

Implicit numeric conversion is not a problem in itself but, if unexpected, may cause difficulties when tracing bugs.


double m(int i) { return i * 10; }
double m(int i) { return (double) (i * 10); }

Configure the inspection:

  • Use the Ignore widening conversions option to ignore implicit conversion that cannot result in data loss (for example, int->long).

  • Use the Ignore conversions from and to 'char' option to ignore conversion from and to char. The inspection will still report conversion from and to floating-point numbers.

  • Use the Ignore conversion from constants and literals to make the inspection ignore conversion from literals and compile-time constants.

Inspection options

Here you can find the description of settings available for the Implicit numeric conversion inspection, and the reference of their default values.

Ignore widening conversions

Not selected

Ignore conversions from and to 'char'

Not selected

Ignore conversions from constants and literals

Not selected

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.14841

Last modified: 12 March 2024