Shift operation by inappropriate constant

Reports shift operations where the shift value is a constant outside the reasonable range.

Integer shift operations outside the range 0..31 and long shift operations outside the range 0..63 are reported. Shifting by negative or overly large values is almost certainly a coding error.

Example:

  int shiftSize = 32;
  // Warning: shift by 32 bits is equivalent to shift by 0 bits, so there's no shift at all.
  int mask = (1 &lt;&lt; shiftSize) - 1;

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.

ShiftOutOfRange

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 | Bitwise operation issues

Availability

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