Java Arrays:-
- Arrays mean that to store the homogenous (similar data type) data value.
- Arrays stored the element in a contiguous memory location.
- Array in Java is index-based, the first element of the array is stored at the 0th index, and the second element is stored on the first index and so on.
- In Java, we can also generate single dimensional or multidimensional array in java.
- The main disadvantages of arrays are, we can store the only fixed size of data.
Types of Array in java:-
There are two types of array:-
- Single Dimensional Array.
- Multidimensional Array.
Declaration of arrays:-
data_type array_name[array_size];
Example:-
float mark [5];
Access the Elements of an Array
We can access an array element by referring to the index number. This statement accesses the value of the first element in cars:
Example
String [] cars = {"Volvo", "BMW", "Ford", "Mazda"}; System.out.println(cars[0]); // Outputs Volvo.
Array Length:-
To find out how many elements an array by using the length property:
Example
String[] cars = {"Volvo", "BMW", "Ford", "Mazda"}; System.out.println(cars.length); // Outputs 4.
Example of Java Array
Single Dimension
class Studentarray { public static void main(String args[]) { int a[]=new int[5] a[0]=450; a[1]=320; a[2]=75; a[3]=43; a[4]=502; for(int i=0;i<a.length;i++) System.out.println(a[i]); } } Output:- 450 320 75 43 502
Multidimensional Array
class Studentarray { public static void main(String args []) { int a[][]={{1,2,3},{4,5,6},{7,8,9}}; for(i=0; i<=2; i++) { for(j=0; j<=2; j++) { System.out.println(arr[i][j]+" "); } System.out.println(); } } } Output:- 1 2 3 4 5 6 7 8 9
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