Why isn’t there a java.lang.Array class? If a java array is an Object, shouldn’t it extend Object?

by

From JLS:

Every array has an associated Class object, shared with all other
arrays with the same component type. [This] acts as if: the direct superclass of an array
type is Object [and] every array type implements the interfaces Cloneable
and java.io.Serializable.

This is shown by the following example code:

class Test {
    public static void main(String[] args) {
        int[] ia = new int[3];
        System.out.println(ia.getClass());
        System.out.println(ia.getClass().getSuperclass());
    }
}

which prints:

class [I
class java.lang.Object

where the string "[I" is the run-time type signature for the class object "array with component type int".

And yes, since array types effectively extend Object, you can invoke toString() on arrayObject also see the above example 

int arr[] = new arr[2];
arr.toString();

More Related Contents:

  1. Difference between Object[] and Array of specific Objects in java
  2. How to read a file and put it into an array of objects?
  3. Array of JSON Object to Java POJO
  4. How to sort an array of objects in Java?
  5. Is an array a primitive type or an object (or something else entirely)?
  6. make arrayList.toArray() return more specific types
  7. How to initialize an array of objects in Java
  8. Error: Generic Array Creation [duplicate]
  9. Deep copy of an object array
  10. How can I turn a JSONArray into a JSONObject?
  11. Does Java JIT compiler sacrifice performance to favor Collections?
  12. Java Serializable Object to Byte Array
  13. Array initialization syntax when not in a declaration
  14. What is the default initialization of an array in Java?
  15. “Code too large” compilation error in Java
  16. how to parse JSONArray in android
  17. Resize an Array while keeping current elements in Java?
  18. Java count occurrence of each item in an array
  19. Variable length (Dynamic) Arrays in Java
  20. How to display a svg byte array as an image in a JasperReport?
  21. ArrayIndexOutOfBoundsException when iterating through all the elements of an array
  22. Remove Null Value from String array in java
  23. Casting an array of Objects into an array of my intended class
  24. Arrays constants can only be used in initializers error
  25. How does one instantiate an array of maps in Java?
  26. Comparing Integer objects [duplicate]
  27. Arrays with trailing commas inside an array initializer in Java
  28. In Java, remove empty elements from a list of Strings
  29. Is there any difference between “Object[] x” and “Object x[]”?
  30. Does rest supports arraylist of objects?

Leave a Comment