DEFINITION
Array is a series of objects all of which are the same size and type. It contains homogeneous data.
DECLARATION OF ARRAY
int arr[] = new int[5];
Storage structure of Array in Stack and Heap
If multiple arrays are to be declared ,any syntax of the following can be used:
int ar1[] , ar2[], ar3[];
Or
int[] ar1,ar2,ar3;
PRINTING ELEMENTS OF ARRAY USING FOR-EACH LOOP
class A{
public static void main(String args[]){
int ar[] = {23,13,12,45,56};
//Using for - each loop
for(int x : ar){
System.out.println(x+"\n");
}
}
ARRAY OF REFERENCE TYPE OF A CLASS
If Student is class :
class Student{
//some attributes
}
And , ar is an Array declared as follows :
Student ar[] = new Student[5];
Then , in memory it can be represented as :
2 D ARRAY
An array of arrays can be called as 2D array.
Example :
int ar[][] = new int[3][4]; //This creates an array with 3 rows and 4 columns
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