Array

 Array in Java

• It is a collection of data of same data type.
• It is used to store group of data simultaneously.
• It can store data of same data type means an integer array can store only integer value ,character array can store only character value and so on.
• We can not fetch data from array directly therefore we use index point.
• The indexing of array always start with 0.
• Index value is always an integer number.
• Array may be of any data type like int,char,float etc.

• Here a is the name of array.
• int is the data type of array.
• Size of array is 5 means we can store maximum 5 values in this array.

Initialization of array method 1:

 int ar[]={45,23,89,12,78};

 

Initialization of array method 2:

int a[]=new int[5];
  a[0]=45;
  a[1]=23;
  a[2]=89;
  a[3]=12;
  a[4]=78

Types of Array 

 

 One Dimensional

 Multi Dimensional 

 

    

Initialization of array method 1:

int a[3][3]={ {40,50,60},{10,20,30},{70,80,90} };