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.

Example:

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

After the quick-fix is applied:

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

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.

ImplicitNumericConversion

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

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.

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

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Java, 243.23126

Last modified: 03 December 2024