Cast conflicts with 'instanceof'

Reports type cast expressions that are preceded by an instanceof check for a different type.

Although this might be intended, such a construct is most likely an error, and will result in a java.lang.ClassCastException at runtime.

Example:

class Main {
  int whenCharSequenceCastToNumber(Object o){
    if (o instanceof CharSequence) {
      return ((Number) o).intValue();
    }
    return 0;
  }

  int earlyReturnWhenNotCharSequence(Object o){
    if (!(o instanceof CharSequence)) return 0;
    return ((Number)o).intValue();
  }
}

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023