Arrays in java
“A collection of similar data items that can be stored in continuous memory” – An array.
It has the index starts from 0 to n.
Syntax:
Datatype Array_variable[ index_value];
Eg:
int a[10];
Sample Java program to create and display the array
elements:
·
Create a class “arrayEg” and write the main()
function inside it.
·
Declare the variable a[] as integer and assign
some values.
·
Using a for loop, print the value.
class arrayEg
{
public static void
main(String args[])
{
int
a[]={11,12,13,14,15,16,17,18,19,20};
System.out.println("The array elements are:");
for(int
i=0;i<10;i++)
{
System.out.println(a[i]);
}
}
}
Compile and run the program.
C:\raji\blog>javac arrayEg.java
C:\raji\blog>java arrayEg
The array elements are:
11
12
13
14
15
16
17
18
19
20
It is the easy way to use array elements. Next program is to
find sum of elements of an array.
#Java program to find Sum of elements program of an array:
·
A special package “java.util.Scanner” is
imported in this program.
·
A public class “ArrayEg1” with main() function
is written here.
·
Create an object for Scanner class.
·
Read the input from runtime as number of
elements.
·
Read the array elements using a for loop.
·
Again, using a for loop, add the array elements
to sum variable.
·
Print the sum of elements.
·
Close the scanner.
Program:
import java.util.Scanner;
public class ArrayEg1 {
public static void
main(String[] args) {
Scanner
scanner = new Scanner(System.in);
System.out.print("Enter the number
of elements");
int no =
scanner.nextInt(); // Read the number of elements
int[] a = new int[no]; // Array declaration
int j=0,
sum=0;
System.out.println("Enter " +
no + " elements: ");
for (j = 0;
j< no; j++) {
a[j] =
scanner.nextInt(); // get the array elements
}
for (j = 0; j
< no; j++) {
sum=sum+a[j];
}
System.out.println("The sum of elements in the array: "+sum);
scanner.close(); // Close the scanner
}
}
The output is shown below.
C:\raji\blog>javac ArrayEg1.java
C:\raji\blog>java ArrayEg1
Enter the number of elements5
Enter 5 elements:
11
22
33
44
55
The sum of elements in the array: 165
This is the way of using Arrays in java.
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