Arrays

Arrays in Java are Objects

• This is why arrays are initialized using new keyword

• For each array type, there exists a corresponding class.

  • So there is a class for int[], for float[], double[] etc.

  • These classes are the part of java language and not available to the programmer level

  • To know the class of any array

    // Here x is the name of the array.
    Sys
    

Corresponding class names for some array types

Array typeCorresponding          Class Name
int[]                            [I
int[][]                          [[I
double[]                         [D
double[][]                       [[D
short[]                          [S
byte[]                           [B
boolean[]                        [Z

[ for single dimension [[ for two-dimensional

• Every array type implements Serializable and Cloneable.
• Arrays can be assigned to variables of type Object — Upcasting.
• All methods of Object class can be invoked on an array

Arrays Methods

• Arrays.sort(arr)
• Arrays.fill(arr,0): Fills all elements of an array with the passed value.

References

• Is an array a primitive type or an object in Java? - GeeksforGeeks
• Chapter 10. Arrays - Oracle Docs