int intArray[]; //declaring array
intArray = new int[20]; // allocating memory to array
//OR
int[] intArray = new int[20]; // combining both statements in one
An array is an ordered collection of elements of the same type, identified by a pair of square brackets [].
To use an array, you need to:
1. Declare the array with a name and a type. Use a plural name for array, e.g., marks, rows, numbers. All elements of the array belong to the same type.
2. Allocate the array using new operator, or through initialization, e.g.
int[] marks; // Declare an int array named marks
// marks contains a special value called null.
int marks[]; // Same as above, but the above syntax recommended
marks = new int[5]; // Allocate 5 elements via the "new" operator
// Declare and allocate a 20-element array in one statement via "new" operator
int[] factors = new int[20];
// Declare, allocate a 6-element array thru initialization
int[] numbers = {11, 22, 33, 44, 55, 66}; // size of array deduced from the number of items
Java array is an object which contains elements of a similar data type.
Additionally, The elements of an array are stored in a contiguous memory
location.
Basically, it is one of the a data structure where we store similar elements.
We can store only a fixed set of elements in a Java array.
following shows the use of the array in java,
int a[]=new int[5];//declaration and instantiation
a[0]=10;//initialization
a[1]=20;
//after printing array
default value of arrray element is 0;
[10,20,0,0,0]