20 Properties of Arrays in Java

Problem:

List the 20 properties of java arrays.

Output:

Not applicable.

Solution:

Here are the main properties of arrays in Java:
1. Arrays are objects.
2. Arrays are created dynamically (at run time).
3. Arrays may be assigned to variables of type Object.
4. Any method of the Object class may be invoked on an array.
5. An array object contains a sequence of variables.
6. The variables are called the components or elements of the array.
7. If the component type is T, then the array itself has type T[].
8. An array type variable holds a reference to the array object.
9. The component type may itself be an array type.
10. An array element is a component whose type is not an array type.
11. An element’s type may be either primitive or reference.
12. The length of an array is its number of components.
13. An array’s length is set when the array is created, and it cannot be changed.
14. An array’s length can be accessed as a public final instance variable.
15. Array index values must be integers in the range 0...length 1.
16. An ArrayIndexOutOfBoundsException is thrown if Property 15 is violated.
17. Variables of type short, byte, or char can be used as indexes.
18. Arrays can be duplicated with the Object.clone() method.
19. Arrays can be tested for equality with the Arrays.equals() method.
20. Array objects implement Cloneable and java.io.Serializable.