Using reflection to check array type and length : Array Reflection Utilities « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Array Reflection Utilities

import java.lang.reflect.Array;

public class MainClass {
  public static void main (String args[]) {
    int[] object = {1,2,3};
    Class type = object.getClass();
    if (type.isArray()) {
      Class elementType = type.getComponentType();
      System.out.println("Array of: " + elementType);
      System.out.println("Length: " + Array.getLength(object));
    }
  }
}

Array of: int
Length: 3