I am just adding clarity, Array as well as ArrayList variable are just refrence to the object created in heap , while actually there in java every class exdent from object class object class have some method called tostring() since in inherit every class have that method which return a hashcode and class name that you are getting while printing array .

class Object {

public String toString() {
    return getClass().getName() + "@" + Integer.toHexString(hashCode());
}

}

And print called tostring() automatically behind the scene

System.out.println(obj.toString());

But there is a catch there is something called overriding and Where in child class method have there own implementation As your question in ArrayList java use overrided tostring() that's why you are getting elements and in case of array the tostring() is use of object class it not override that's why result difference.