Category Archives: Java Array Programs

Java Array Programs

Java Program to Print 2D array

In this tutorial, we will learn to create a Java Program to Print 2D array using Java programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following Java programming topics:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

What is 2D Array[]?

Multidimensional Arrays Or 2D array defined as in simple words as “array of arrays”.

For example:
The array int[][] a = new int[5][5] can store a total of (5*5) = 25 elements.

Java Program to Print 2D array

In this program we would simply print a “2d” array .first of we would declare variables and called a function to display all the value of array[].let have a look at the code

//Java program to print 2d aaray
import java.util.*;

class Array2D { 
  
    public static void Printing_String(int arr[][]) 
    { 
// printing the array values..
        for (int n = 0 ; n < arr.length ; n++)
        {
            System.out.println(Arrays.toString(arr[n])); 
        } 
            
    } 
  // Main function
    public static void main(String args[])
    { 
   //declaring 2d array
        int arr[][] = { { 1, 2, 3 }, 
                        { 4, 5, 6 }, 
                        { 7, 8, 9 } }; 
        Printing_String(arr); // passing value to function()
    } 
}

//Java program to print 2d aaray

import java.util.*;

class Array2D {

public static void Printing_String(int arr[][])

{

// printing the array values..

for (int n = 0 ; n < arr.length ; n++)

{

System.out.println(Arrays.toString(arr[n]));

}

// Main function

public static void main(String args[])

{

//declaring 2d array

int arr[][] = { { 1, 2, 3 },

{ 4, 5, 6 },

{ 7, 8, 9 } };

Printing_String(arr); // passing value to function()

}

Output

In the above program, we have first declared and initialized a set variables required in the program.

arr[] = it will hold array values.
n= for iteration

After declaring variables we pass the array to function Printing_String().

where we simply print the array value using for loop.

Java Program to Print Odd and Even Numbers from an array

In this tutorial, we will learn to create a Java Program to Print Odd and Even Numbers from an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

What is Even and Odd Number.

A number which is divisible by 2 is called even number (number%2==0) after dividing 2 remainder remain zero.
A number which is not divisible by 2 is called an odd number (number%2 !=0) after dividing 2 remainder remains.

Java Program to Print Odd and Even Numbers from an array

In this program we will find number in an array are even or odd using if else statement and loop. We would first declared and initialized the required variables. Next, we will find that number is even or odd.lets have a look at the code.

// java program to find even odd in a n array[]
public class OddevenArray {
   public static void main(String args[]){
  // declaring variables 
      int[] arr = {2, 3, 4, 5, 6};
      System.out.println(" Even numbers in the given array are:: ");
// Finding even in a an array
      for (int i=0; i<arr.length; i++){
         if(arr[i]%2 == 0){
            System.out.println(arr[i]);
         }
      }
      System.out.println("Odd numbers in the given array are:: ");
// Finding odd in an array[]
      for (int i=0; i<arr.length; i++){
         if(arr[i]%2 != 0){
            System.out.println(arr[i]);
         }
      }
   }
}

// java program to find even odd in a n array[]

public class OddevenArray {

public static void main(String args[]){

// declaring variables

int[] arr = {2, 3, 4, 5, 6};

System.out.println(" Even numbers in the given array are:: ");

// Finding even in a an array

for (int i=0; i<arr.length; i++){

if(arr[i]%2 == 0){

System.out.println(arr[i]);

}

System.out.println("Odd numbers in the given array are:: ");

// Finding odd in an array[]

for (int i=0; i<arr.length; i++){

if(arr[i]%2 != 0){

System.out.println(arr[i]);

}

Output

Even and odd in an array.

In the above program, we have first declared and initialized a set variables required in the program.

arr= it will hold array values
i= for iteration .

After declaring variables we initiate values in a an array[].

Algorithm

Declare an array and an element in array[].
within the loop find element even or odd applying condition separate for even a shown in image below.

Print the even elements by checking the conditions using for loop.

within the loop find element even or odd applying condition separate for odd a shown in image below.

this is the source code of the Java Program to Print the Odd & Even Numbers in an Array.

Java Program to Remove Duplicate Element in an array

In this tutorial, we will learn to create a Java Program to Remove Duplicate Element in an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Java Program to Remove Duplicate Element in an array

In this program we will find duplicate element in an array if-else statement and loop. We would first declared and initialized the required variables. Next, we will find repeated number in an array.lets have a look at the code.

// Java Program to Remove Duplicate Elements

public class Duplicate {

	public static int remove(int arr[], int size)
	{
		if (size == 0 || size == 1) {
			return size;
		}

		// creating another array and removing duplicate elements
		int[] temp = new int[size];
		int j = 0;

		for (int i = 0; i < size - 1; i++) {
			if (arr[i] != arr[i + 1]) {
				temp[j++] = arr[i];
			}
		}
		temp[j++] = arr[size - 1];

	
		for (int i = 0; i < j; i++) {
			arr[i] = temp[i];
		}

		return j;
	}
	public static void main(String[] args)
	{
		int arr[] = { 1, 1, 2, 2, 3, 4};
		int number = arr.length;

		number = remove(arr, number);

		// Printing The array elements
		System.out.println("printing removed duplicate array elements  ");
		for (int i = 0; i < number; i++)
			System.out.print(arr[i] + " ");
	}
}

// Java Program to Remove Duplicate Elements

public class Duplicate {

public static int remove(int arr[], int size)

{

if (size == 0 || size == 1) {

return size;

}

// creating another array and removing duplicate elements

int[] temp = new int[size];

int j = 0;

for (int i = 0; i < size - 1; i++) {

if (arr[i] != arr[i + 1]) {

temp[j++] = arr[i];

}

temp[j++] = arr[size - 1];

for (int i = 0; i < j; i++) {

arr[i] = temp[i];

}

return j;

}

public static void main(String[] args)

{

int arr[] = { 1, 1, 2, 2, 3, 4};

int number = arr.length;

number = remove(arr, number);

// Printing The array elements

System.out.println("printing removed duplicate array elements ");

for (int i = 0; i < number; i++)

System.out.print(arr[i] + " ");

}

Output

In the above program, we have first declared and initialized a set variables required in the program.

arr= it will hold array values
number and size= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[].

and with the help length we find the length of an array.

Now we will pass arr[] and length to remove() method where we remove duplicate values within the array[].

Steps to remove duplicate elements

Create a temp array temp[] to store unique values of elements.
travel through array and copy all the unique elements of arr[] to temp[]. and count unique elements.
Copy j elements from temp[] to arr[].

and finally print sorted array.

Java to Program Find Smallest Number in an array

In this tutorial, we will learn to create a Java to Program Find 2nd Smallest Number in an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Java to Program Find Smallest Number in an array

In this program we will find smallest element in an array using nested for loop. We would first declared and initialized the required variables. Next, we will find smallest number in an array. Lets have a look at the code.

//java program to find smallest among the array..
import java.io.*;
public class Smallest_in_An_Array {
   public static void main(String args[]){
// declaring variables and initilainzing values 
      int temp, l;
      int arr[] = {10, 20, 25, 30, 12, 5}; // assign values to array
      l = arr.length; // finding length of an array
      for(int i = 0; i<l; i++ )
       { 
        for(int j = i+1; j<l; j++)
         {
            if(arr[i]>arr[j]){
               temp = arr[i];
               arr[i] = arr[j];
               arr[j] = temp;
            }
         }
      }
//Printing the result..
System.out.println("Smallest element in an array is "+arr[0]);
   }
}

//java program to find smallest among the array..

import java.io.*;

public class Smallest_in_An_Array {

public static void main(String args[]){

// declaring variables and initilainzing values

int temp, l;

int arr[] = {10, 20, 25, 30, 12, 5}; // assign values to array

l = arr.length; // finding length of an array

for(int i = 0; i<l; i++ )

{

for(int j = i+1; j<l; j++)

{

if(arr[i]>arr[j]){

temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

//Printing the result..

System.out.println("Smallest element in an array is "+arr[0]);

}

Output

Smallest in an array

In the above program, we have first declared and initialized a set variables required in the program.

arr[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

with the help of length function we will find the length of an array .

after that with the help or nested for loop we will find smallest element in array as shown in image below

Smallest in an array

Here first we assign first value of an array to variable temp.
Compare the first two elements of the array.
If the value of first element is greater than the second exchange them.
Then, compare 2 value and 3 value elements if the second element value is greater than the 3 value swap them.
Repeat this till the end of the array[].
and finally print smallest in an array.

Java Program to Find Largest Number in an array

In this tutorial, we will learn to create a Java Program to Find Largest Number in an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Java Program to Find Largest Number in an array

//java program to find greatest among the array..
import java.io.*;
public class Largest_in_An_Array {
   public static void main(String args[]){
// declaring variables and initializing values
      int temp, l;
      int arr[] = {10, 20, 25, 30, 12, 5};// assign values to array
      l = arr.length;
      for(int i = 0; i<l; i++ ){// finding length of an array
         for(int j = i+1; j<l; j++){
            if(arr[i]<arr[j]){
               temp = arr[i];
               arr[i] = arr[j];
               arr[j] = temp;
            }
         }
      }
//Printing the result..
System.out.println("largest element in an array is "+arr[0]);
   }
}

//java program to find greatest among the array..

import java.io.*;

public class Largest_in_An_Array {

public static void main(String args[]){

// declaring variables and initializing values

int temp, l;

int arr[] = {10, 20, 25, 30, 12, 5};// assign values to array

l = arr.length;

for(int i = 0; i<l; i++ ){// finding length of an array

for(int j = i+1; j<l; j++){

if(arr[i]<arr[j]){

temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

//Printing the result..

System.out.println("largest element in an array is "+arr[0]);

}

Output

Largest in an array

In the above program, we have first declared and initialized a set variables required in the program.

arr[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

with the help of length function we will find the length of an array .

after that with the help or nested for loop we will find smallest element in array as shown in image below

Largest in an array

Here first we assign first value of an array to variable temp.
Compare the first two elements of the array.
If the value of first element is smaller than the second exchange them.
Then, compare 2 value and 3 value elements if the second element value is smaller than the 3 value swap them.
Repeat this till the end of the array[].
and finally print largest in an array.

Java Program to Find 2nd Largest Number in an array

In this tutorial, we will learn to create a Java Program to Find 2nd Largest Number in an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Java Program to Find 2nd Largest Number in an array

//java program to fing 2nd largest in  an array
public class Second{  
public static int Second_Largest(int[] a, int size){  
//declaring variables in sorting array
int temp;  
for (int i = 0; i < size; i++)   //sorting array
        {  
            for (int j = i + 1; j < size; j++)   
            {  
                if (a[i] > a[j])   
                {  
                    temp = a[i];  
                    a[i] = a[j];  
                    a[j] = temp;  
                }  
            }  
        }  
       return a[size-2];  //finding second largest in an array.
}  
public static void main(String args[]){  
int a[]={1,2,5,6,3};  //initialize values..
//Printing result..
System.out.println("Second Largest: "+Second_Largest(a,5));  
}
}

//java program to fing 2nd largest in an array

public class Second{

public static int Second_Largest(int[] a, int size){

//declaring variables in sorting array

int temp;

for (int i = 0; i < size; i++) //sorting array

{

for (int j = i + 1; j < size; j++)

{

if (a[i] > a[j])

{

temp = a[i];

a[i] = a[j];

a[j] = temp;

}

return a[size-2]; //finding second largest in an array.

}

public static void main(String args[]){

int a[]={1,2,5,6,3}; //initialize values..

//Printing result..

System.out.println("Second Largest: "+Second_Largest(a,5));

}

Output

2nd Large

In the above program, we have first declared and initialized a set variables required in the program.

a[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

here we will call a function where we fin second greatest in an array[].

2nd Largest in an array

- Compare the first two elements of the array
- If the first element is greater than the second exchange them.
- Then, compare 2nd and 3rd elements if the second element is greater than the 3rd swap them.
- Repeat this till the end of the array.
- and at last function return a[size-2];
- which is the second largest in an array[].

and finally we will print the result it means the second largest in an array[].

Java Program to Find 3rd Largest Number in an array

In this tutorial, we will learn to create a Java Program to Find 3rd Largest Number in an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Java Program to Find 3rd Largest Number in an array

//java program to fing 3rd largest in  an array
public class Third{  
public static int Third_Largest(int[] a, int size){  
//declaring variables in sorting array
int temp;  
for (int i = 0; i < size; i++)   //sorting array
        {  
            for (int j = i + 1; j < size; j++)   
            {  
                if (a[i] > a[j])   
                {  
                    temp = a[i];  
                    a[i] = a[j];  
                    a[j] = temp;  
                }  
            }  
        }  
       return a[size-3];  //finding third largest in an array.
}  
public static void main(String args[]){  
int a[]={1,2,5,6,3};  //initialize values..
//Printing result..
System.out.println("Third Largest in an array: "+Third_Largest(a,5));  
}
}

//java program to fing 3rd largest in an array

public class Third{

public static int Third_Largest(int[] a, int size){

//declaring variables in sorting array

int temp;

for (int i = 0; i < size; i++) //sorting array

{

for (int j = i + 1; j < size; j++)

{

if (a[i] > a[j])

{

temp = a[i];

a[i] = a[j];

a[j] = temp;

}

return a[size-3]; //finding third largest in an array.

}

public static void main(String args[]){

int a[]={1,2,5,6,3}; //initialize values..

//Printing result..

System.out.println("Third Largest in an array: "+Third_Largest(a,5));

}

Output

3rd Largest in an array[].

In the above program, we have first declared and initialized a set variables required in the program.

a[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

here we will call a function where we fin second greatest in an array[].

3rd Largest in an array

- Compare the first two elements of the array
- If the first element is greater than the second exchange them.
- Then, compare 2nd and 3rd elements if the second element is greater than the 3rd swap them.
- Repeat this till the end of the array.
- and at last function return a[size-3];
- which is the second largest in an array[].

and finally we will print the result it means the second largest in an array[].

Java Program to sort the elements of an array in descending order

In this tutorial, we will learn to create a Java Program to sort the elements of an array in descending order using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Sorting in a an array[]

Sorting elements means to arrange elements within the array in a certain specific order. either Ascending(increasing) or descending(decreasing) order.

Java Program to sort the elements of an array in ascending order

In this program we will take size of an array and sort the elements of an array using nested for loop. We would first declared and initialized the required variables. Next, we will sort the elements in an array. Lets have a look at the code.

//java program to print array in decending order
import java.util.Scanner;
public class Descending {
    public static void main(String[] args) {
        int number, temp;
        Scanner s = new Scanner(System.in);
        System.out.print("Enter elements you want in array:");
        number = s.nextInt();
        int a[] = new int[number];
        System.out.println("Enter all the elements:");
        for (int i = 0; i < number; i++) {
            a[i] = s.nextInt();
        }
        for (int i = 0; i < number; i++) {
            for (int j = i + 1; j < number; j++) {
                if (a[i] < a[j]) {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        System.out.print("Descending Order:");
        for (int i = 0; i < number - 1; i++)
        {
            System.out.print(a[i] + ",");
        }
        System.out.print(a[number - 1]);
    }
}

//java program to print array in decending order

import java.util.Scanner;

public class Descending {

public static void main(String[] args) {

int number, temp;

Scanner s = new Scanner(System.in);

System.out.print("Enter elements you want in array:");

number = s.nextInt();

int a[] = new int[number];

System.out.println("Enter all the elements:");

for (int i = 0; i < number; i++) {

a[i] = s.nextInt();

}

for (int i = 0; i < number; i++) {

for (int j = i + 1; j < number; j++) {

if (a[i] < a[j]) {

temp = a[i];

a[i] = a[j];

a[j] = temp;

}

System.out.print("Descending Order:");

for (int i = 0; i < number - 1; i++)

{

System.out.print(a[i] + ",");

}

System.out.print(a[number - 1]);

}

Output

Sorted elements in an array.

In the above program, we have first declared and initialized a set variables required in the program.

arr[]= it will hold array values
number = it will hold length of an array.
i = for iteration.
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

Elements will be sorted in Descending order .As shown in the image below.

Algorithm to sort array in descending order.

Start the algo
Declare an array[].
Taking size and element of an array from user.
Declared a temp variable to store the elements for swapping.

Here first for loop will hold the elements and traverse through all the elements.

Second for loop to compare with the remaining elements.
Sort the elements by comparing.
Display the updated array.
Stop

The above program shows sort an array in descending order using for loops .

Java Program to sort the elements of an array in ascending order

In this tutorial, we will learn to create a Java Program to sort the elements of an array in ascending order using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Algorithm

STEP 1: START
2: Ask user to enter size of an array.
3:Then take elements of an array
4: iterate each value through loop.
5 for (int i = 0; i < number; i++)
{
for (int j = i + 1; j < number; j++)
{
if(arr[i]>arr[j]) then
temp = arr[i]
arr[i]=arr[j]
arr[j]=temp
}
}
STEP 6: PRINT “Elements of array sorted in ascending order”
STEP 7: for (int i = 0; i < number – 1; i++)
{
System.out.print(arr[i] + “,”);
}
System.out.print(arr[number – 1]);
STEP 8: END

Java Program to sort the elements of an array in ascending order

//java program to sort a given array.
import java.util.Scanner;
public class Sort 
{
    public static void main(String[] args) 
    {
    // declaring variables and taking values form user..
        int number, temp;
        Scanner s = new Scanner(System.in);
        System.out.print("Enter size of an array:");
        number = s.nextInt();
        int arr[] = new int[number];
// taking elements in an array
        System.out.println("Enter elements pls ");
        for (int i = 0; i < number; i++) 
        {
            arr[i] = s.nextInt();
        }
// sorting the given array values..
        for (int i = 0; i < number; i++) 
        {
            for (int j = i + 1; j < number; j++) 
            {
                if (arr[i] > arr[j]) 
                {
                    temp = arr[i];
                    arr[i] = arr[j];
                    arr[j] = temp;
                }
            }
        }
// printing the sorted array
        System.out.print("Ascending Order:");
        for (int i = 0; i < number - 1; i++) 
        {
            System.out.print(arr[i] + ",");
        }
        System.out.print(arr[number - 1]);
    }
}

//java program to sort a given array.

import java.util.Scanner;

public class Sort

{

public static void main(String[] args)

{

// declaring variables and taking values form user..

int number, temp;

Scanner s = new Scanner(System.in);

System.out.print("Enter size of an array:");

number = s.nextInt();

int arr[] = new int[number];

// taking elements in an array

System.out.println("Enter elements pls ");

for (int i = 0; i < number; i++)

{

arr[i] = s.nextInt();

}

// sorting the given array values..

for (int i = 0; i < number; i++)

{

for (int j = i + 1; j < number; j++)

{

if (arr[i] > arr[j])

{

temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

// printing the sorted array

System.out.print("Ascending Order:");

for (int i = 0; i < number - 1; i++)

{

System.out.print(arr[i] + ",");

}

System.out.print(arr[number - 1]);

}

Output

Sorted elements in an array.

In the above program, we have first declared and initialized a set variables required in the program.

arr[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

Elements will be sorted in a way that the smallest element will show on extreme left which in this case is 1. The largest element will show at extreme right which in this case is 63.As shown in the image below.

Steps to change elements.

Compare elements with each other.
Use nested for loop to keep track.
Swap the elements if the first element is greater than the second element.
this process followed till all the elements in array are sorted.

and finally we will print the sorted elements.

Java Program to right rotate the elements of an array

In this tutorial, we will learn to create a Java Program to right rotate the elements of an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Rotate an array right means?

Array is said to be right rotated if elements in an array are moved to its right >> by one(1) position.

Example:

Array=> [1, 2, 3, 4, 5].
Rotate Rights=> [2, 3, 4, 5, 1].

Java Program to right rotate the elements of an array

In this program we will shift right element in an array using for loop. We would first declared and initialized the required variables. Next, we will shift element of an array. Lets have a look at the code.

// java program to swap  elements of an array to right
import java.util.Arrays;
class Main
{
    // Function to right-rotate an array by one position
    public static void RotateIright(int[] a)
    {
 //rotate one position right
        int last = a[a.length - 1];
        for (int i = a.length - 2; i >= 0; i--) {
            a[i + 1] = a[i];
        }
        a[0] = last;
    }
    // Function to right-rotate an array by `one right` positions
    public static void rightRotate(int[] a, int rotby)
    {
        // base case: invalid input
        if (rotby < 0 || rotby >= a.length) {
            return;
        }
         for (int i = 0; i < rotby; i++) {
            RotateIright(a);
        }
    }
    public static void main(String[] args)
    {
        int[] a = { 1, 2, 3, 4, 5};
        int rotby = 1;
        rightRotate(a, rotby);
        System.out.println(Arrays.toString(a));
    }
}

// java program to swap elements of an array to right

import java.util.Arrays;

class Main

{

// Function to right-rotate an array by one position

public static void RotateIright(int[] a)

{

//rotate one position right

int last = a[a.length - 1];

for (int i = a.length - 2; i >= 0; i--) {

a[i + 1] = a[i];

}

a[0] = last;

}

// Function to right-rotate an array by `one right` positions

public static void rightRotate(int[] a, int rotby)

{

// base case: invalid input

if (rotby < 0 || rotby >= a.length) {

return;

}

for (int i = 0; i < rotby; i++) {

RotateIright(a);

}

public static void main(String[] args)

{

int[] a = { 1, 2, 3, 4, 5};

int rotby = 1;

rightRotate(a, rotby);

System.out.println(Arrays.toString(a));

}

Output

Right rotated array[]

In the above program, we have first declared and initialized a set variables required in the program.

a[]= it will hold array values
rotby= it will hold rotation position.
i = for iteration
last = it will hold length of an array[].

After declaring variables we initiate values in an array[]

after that we will call rightRotate(a,rotby) where we pass two arguments one array and another is rotate by value i.e how many time rotate the array to its right.

In an array, if rotby is “1” then, elements of an array moved to its right by one position it mean first element of array take second(2) position, the second element will be moved to the third position and so on. as shown down below->

Array=> [1, 2, 3, 4, 5].
Rotate Rights=> [2, 3, 4, 5, 1].

Finally print right rotated array .

Java Program to print sum of all the items of the array

In this tutorial, we will learn to create a Java Program to print sum of all the items of the array using Java programming.

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following Java programming topics:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

What is An array?

The array is a collection of similar data types. An array can store multiple values with different indexes in memory by using a single variable. The array can be both single and multidimensional.

Program description to Find Sum of all Elements in an Array.

In this program, we will first take the input array size and the elements from the user. Then we will add all the elements of the array using the for loop. At last, we will print that sum of elements of the array using the print function.

import java.util.Arrays;
import java.util.Scanner;
public class SumOfArray {
   //Body of main function of the program.
   public static void main(String args[]){
      //Taking the size of the array.
      System.out.println("Enter the required size of the array :: ");
      Scanner s = new Scanner(System.in);
      //Declaring the required variables for the program.
      int sz = s.nextInt();
      int arry[] = new int [sz];
      int sum = 0;
      //Taking the elements of the array.
      System.out.println("Enter the elements of the array one by one ");
      
      //Finding the sum of the elements of the array.
      for(int i=0; i<sz; i++){
         arry[i] = s.nextInt();
         //Adding the elements of the array.
         sum = sum + arry[i];
      }
      //Printing the array.
      System.out.println("Elements of the array are: "+Arrays.toString(arry));
      //Printing the sum of array.
      System.out.println("Sum of the elements of the array ::"+sum);
   }
}

import java.util.Arrays;

import java.util.Scanner;

public class SumOfArray {

//Body of main function of the program.

public static void main(String args[]){

//Taking the size of the array.

System.out.println("Enter the required size of the array :: ");

Scanner s = new Scanner(System.in);

//Declaring the required variables for the program.

int sz = s.nextInt();

int arry[] = new int [sz];

int sum = 0;

//Taking the elements of the array.

System.out.println("Enter the elements of the array one by one ");

//Finding the sum of the elements of the array.

for(int i=0; i<sz; i++){

arry[i] = s.nextInt();

//Adding the elements of the array.

sum = sum + arry[i];

}

//Printing the array.

System.out.println("Elements of the array are: "+Arrays.toString(arry));

//Printing the sum of array.

System.out.println("Sum of the elements of the array ::"+sum);

}

Output:-

In the above program, we have first initialized the required variable.

sum = it will hold the integer value for the sum of numbers.
arry[] = it will hold the integer value of the input elements.
i = it will hold the integer value.
sz = it will hold the integer value of the input.

Input the number of elements and the elements of the array from the user.

Program Logic Code to find the sum of an array.

Printing output sum of the array elements.

Java Program to print number of elements present in an array

In this tutorial, we will learn to create a Java to Program Find 2nd Smallest Number in an array using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Algorithm

STEP 1: start
2: declare and initiate array = {1,2,3,4,5}.
3: Find length using length function ex=> a.length
4: exit.

Java Program to print number of elements present in an array

In this program we will find number of element in an array using length function. We would first declared and initialized the required variables. Next, we will find length of an array element in an array. Lets have a look at the code.

// java program to calculate element present in an array it means number of of element in an array
import java.util.*;  
import java.util.Arrays; 

public class Display_Array {  
    public static void main(String[] args)
    {  
          //declaring variable and initializing variables....
            int [] a = new int [] {1, 2, 3, 4, 5};  
      //to calculate the number of elements present in an array using length function
// as well as print the result ...
System.out.println("Printing elements present in an array: " + a.length);  
    }  
}

// java program to calculate element present in an array it means number of of element in an array

import java.util.*;

import java.util.Arrays;

public class Display_Array {

public static void main(String[] args)

{

//declaring variable and initializing variables....

int [] a = new int [] {1, 2, 3, 4, 5};

//to calculate the number of elements present in an array using length function

// as well as print the result ...

System.out.println("Printing elements present in an array: " + a.length);

}

Output

In the above program, we have first declared and initialized a set variables required in the program.

a[]= it will hold array values.

After declaring variables we initiate values in an array[].

In this our program, we will count the element and print number of elements present in an array.

As we can see that number of elements present in an array can be found by calculating the length of given array. We can clearly see that length of a function is 5 so here we will use length function to calculate length.

So Length in above array is 5. Then number of elements present in the array are 5.

Finally we will print the result as shown in image above..