Integer multiplication or shift implicitly cast to 'long'

Reports integer multiplications and left shifts that are implicitly cast to long.

Example:

  void f(int i) {
    long val = 65536 * i;
  }

After the quick-fix is applied, the code changes to:

  void x(int i) {
    long val = 65536L * i;
  }

Example:

  void f(int i) {
    long value = i &lt;&lt; 24;
  }

After the quick-fix is applied, the code changes to:

  void f(int i) {
    long value = (long) i &lt;&lt; 24;
  }

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.

IntegerMultiplicationImplicitCastToLong

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.

Such multiplications are often a mistake, as overflow truncation may occur unexpectedly. Converting an int literal to a long literal (65536L) fixes the problem.

Inspection ID: IntegerMultiplicationImplicitCastToLong

Inspection options

Here you can find the description of settings available for the Integer multiplication or shift implicitly cast to 'long' inspection, and the reference of their default values.

Ignore expressions where it's proven statically that overflow is impossible

Option ID:

ignoreNonOverflowingCompileTimeConstants

Default value:

Selected

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 IntegerMultiplicationImplicitCastToLong

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

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025