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Java Arrays:
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- The array is an object which contains elements of similar data type. It is a data structure where we can store similar elements. We store only fixed set of elements in a java array.
- Array in java is index based; first element of the array is stored at 0 indexes. It is a group of like-typed variables which are referred by one common name. Arrays in Java work differently than they do in C/C++. Following are some important point about Java.
- An array is an ordered list of values
- Array of size N is indexed starts from 0 to N-1.
- A specific value in an array is referenced using the array name and followed by the index in brackets.
Types of Array in java:
There are two types of array.
- Single Dimensional Array
- Multidimensional Array
Single Dimensional Array in java
Syntax
dataType[] arr; (or)
dataType []arr; (or)
dataType arr[];
Multidimensional array in java:
dataType[][] arrayRefVar; (or)
dataType [][]arrayRefVar; (or)
dataType arrayRefVar[][]; (or)
dataType []arrayRefVar[];
Sample Code:
public class kaashiv_infotech
{
public static void main(String[] args)
{
int[] arr = {11,23,56,24,15};
int count=0;
while(count < 5)
{
System.out.println(arr[count]);
count++;
}
}
}Output:
11
23
56
24
15Advantage of Java Array:
- Code Optimization: It makes the code optimized, we can retrieve or sort the data easily.
- Random access: We can get any data located at any index position.
Disadvantage of Java Array:
- Limited size: We will store only a fixed size of elements in an array. It doesn't grow its size at the runtime. To solve this problem, the collection framework is used in java.