ARRAY IN JAVA
- An array in java is an object that includes components of the same data type. The items of an array are kept in a single memory address.
- In the most cases, an array is a collection of similar type elements stored in a single memory address.
- In a java array, we can only store a fixed number of elements.
- The first element of an array in java is saved at the 0th index, the second element is stored at the 1st index, and so on.
- In java, an array is a dynamically produced class object.
Types of Array in java:
There are two types of array;
👉 Single Dimensional Array
👉 Multidimensional Array
Single Dimensional Array:
A Single dimensional array is a a group of elements with same data type which stored in a linear arrangement under a single variable name.
syntax:
dataType[] arr;
(or)
dataType []arr;
(or)
dataType arr[];
Instantiation of an Array:
arrayRefVar = new datatype[size];
Example:
class demotarray
{
public static void main(String args[])
{
int a[]=new int[5];
a[0]=100;
a[1]=200;
a[2]=300;
a[3]=400;
a[4]=500;
for(int i=0;i<a.length;i++)
System.out.println(a[i]);
}
}
Output:
100
200
300
400
500
Multi dimensional Array:
Multidimensional Array can be defined in simple words as arrays.Data in multidimensional arrays are stored in tabular from in row major order.
Syntax:
datatype [1st dimentional][2nd dimension][]..[Nth imension]array_name = new data_[size1][size2]....[sizeN];
Example:
class demoarray3
{
public static void main(String args[])
{
int arr[][]={{1,2,3},{2,4,5},{4,4,5}};
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
System.out.print(arr[i][j]+" ");
}
System.out.println();
}
}
Output:
1 2 3
2 4 5
4 4 5
