Using the instanceof operator to test whether a reference refers to an array. : instanceof Operator « Operators « SCJP

1. SCJP
2. Operators
3. instanceof Operator

instanceof checks whether the object is an array.

instanceof checks whether the element type of that array is some subclass of the element type 
of the right argument. 


public class MainClass {
  public static void main(String[] argv) {
    int[] intArray = new int[2];
    if (intArray instanceof int[]) {
      System.out.println("it is an int array");
    }
    if (intArray instanceof float[]) {
      System.out.println("it is a float array");
    }
  }
}

Incompatible conditional operand types int[] and float[]