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ITEngineer8995

Professional Coder Coding is my passion

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I'mITEngineer8995

Spatial Data Specialist

Do you want all of your codes in one place?? Then you are landed on the right blog... Here you will find varieties of codes of various languages starting from noob to advance with their samples. Do learn, execute and share your knowledge with others. Do visit my YouTube Channel for execution of these codes .

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Video Clone Detector using Hadoop

2017-2018

A detector which differentiates copied videos from the original ones using Hadoop.

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Java Program To Reverse a String using Recursion

 

Java Program To Reverse a String using Recursion

In this Java Program, we reverse a string using recursion.

The process in which the function calls itself directly or indirectly is called recursion and the corresponding function is called as recursive function

Logic :

 String reversed = reverseString(str);

Step 1 : Create obj str of String class and store the output string in it.

Step 2 : Create another object as reversed and apply the logic of the reverse string in it.

Step 3 : Output the reversed string using the System.out.println method.

Step 4 : Create reverseString method

Step 5 : Apply if statement, if str.isEmpty then return str.

Step 6 : Call function recursively.

Program :

public class JavaExample {

    public static void main(String []args)

    {

        String str = "Welcome To my Channel";

        String reversed = reverseString(str);

        System.out.println("The reversed string is : "+reversed);

    }

    public static String reverseString(String str)

    {

        if(str.isEmpty())

            return str;

        //Calling function recursively

        return reverseString(str.substring(1)) + str.charAt(0);

  }

}

Output :

The reversed string is : lennahC ym oT emocleW

For execution of the same do visit my YouTube Channel :

https://youtu.be/0XA6NlNoIQA

Java Program To Reverse a Number using Recursion

 

Java Program To Reverse a Number using Recursion

In this Java Program, we reverse a number using Recursion.

The process in which the function calls itself directly or indirectly is called recursion and the corresponding function is called as recursive function

Step 1 : Import Scanner Class

Step 2 : Create a method for reverse

Step 3 : Apply if condition in which the number should be smaller than 10

Step 4 : Print the number

Step 5 : Apply else condition in which number should mod by 10 and print the result

Step 6 : Apply reverse method condition in which number should be divided by 10

Step 7 : Create main method

Step 8 : Initialize num to 0

Step 9 : As the user to enter the number and press enter

Step 10 : Create Scanner object

Step 11 : Store the user entered number into num

Step 12 : Print Reverse of the input number is.

Step 13 : Call the reverseMethod method

Program :

import java.util.Scanner;

public class RecursionReverseDemo 

    {   

        //A method for reverse

        public static void reverseMethod(int number)

        {

            if(number < 10)

            {

                System.out.println(number);

                return;

            }

            else

            {

                System.out.print(number % 10);

                //Method is calling itself : recursion

                reverseMethod(number / 10);

            }

        }

        public static void main(String args[])

        {

            int num = 0;

            System.out.println("Input your number and press enter:");

            Scanner sc = new Scanner(System.in);

            num = sc.nextInt();

            System.out.println("Reverse of the input number is:");

            reverseMethod(num);

            System.out.println();

        }        

}

Output :

Input your number and press enter:

5678901

Reverse of the input number is:

1098765

For execution of the same do visit my YouTube Channel : 

https://youtu.be/uu50BfxfhjA

Java Program To Reverse a Number using For Loop

 

Java Program To Reverse a Number using For Loop

In this Java Program, we reverse a number using For loop.

Logic :

   for (;num != 0;)

            {

                reversenum = reversenum * 10;

                reversenum = reversenum + num%10;

                num = num/10;

            }

Step 1 : Import the Scanner Class

Step 2 :  Create the main method

Step 3 : Initialize num and reversenum equals to zero

Step 4 : Ask the user to enter the number by using System.out.println() method

Step 5 : Create Scanner object.

Step 6 : Store the captured input in num

Step 7 : Apply for loop logic to reverse the number

Step 8 : In for loop, num should be not equal to zero

Step 9 : Multiply reversenum with 10 and store its result in reversenum.

Step 10 : Add num%10 to reversenum and store the result into reversenum

Step 11 : Divide num by 10 and store the result in num.

Step 12 : Print the reversenum

Program :

import java.util.Scanner;

public class ForLoopReverseDemo 

    {

        public static void main(String args[])

        {

            int num=0;

            int reversenum = 0;

            System.out.println("Input your number and press enter:");

            //This statement will capture the user input

            Scanner sc = new Scanner(System.in);

            //Captured input would be stored in the number num

            num = sc.nextInt();

            //For loop: No initialization part as num is already initialized.

            //No increment/decrement part as logic

            //num = num/10 already decrements the value of num

            for (;num != 0;)

            {

                reversenum = reversenum * 10;

                reversenum = reversenum + num%10;

                num = num/10;

            }

         System.out.println("Reverse of specified number is:"+reversenum);                    

        }

}

Output :

Input your number and press enter:
56789111
Reverse of specified number is:11198765

For execution of the same do visit my YouTube Channel :

Java Program To Reverse a Number using While Loop

Java Program To Reverse a Number using While Loop

In this Java Program, we reverse a number using while loop.

Logic :

  while (num != 0)

             {

                reversenum = reversenum * 10;

                reversenum = reversenum + num%10;

                num = num/10;                

             }

Step 1 : Import the Scanner Class

Step 2 :  Create the main method

Step 3 : Initialize num and reversenum equals to zero

Step 4 : Ask the user to enter the number by using System.out.println() method

Step 5 : Create Scanner object.

Step 6 : Store the captured input in num

Step 7 : Apply while loop logic to reverse the number

Step 8 : In while loop, num should be not equal to zero

Step 9 : Multiply reversenum with 10 and store its result in reversenum.

Step 10 : Add num%10 to reversenum and store the result into reversenum

Step 11 : Divide num by 10 and store the result in num.

Step 12 : Print the reversenum

Program :

import java.util.Scanner;

public class ReverseNumberWhile 

    {

        public static void main(String args[])

        {

            int num =0;

            int reversenum = 0;

            System.out.println("Input your number and press enter:");

            //This statement will capture the user input

            Scanner sc = new Scanner(System.in);

            //Captured input would be stored in number num

            num = sc.nextInt();

            //While loop: Logic to find out the reverse number

            while (num != 0)

             {

                reversenum = reversenum * 10;

                reversenum = reversenum + num%10;

                num = num/10;                

             }

            System.out.println("Reverse of input number is : "+reversenum);

        }

}

Output :

Input your number and press enter :
145689

Reverse of input number is : 
986541

For execution of the same do visit my YouTube Channel :

Java Program to add two given Matrices

 

Java Program to add two given Matrices

In this Java Program, we add two given matrices. 

Array is a data structure consisting of collections of elements each identified by atleast one array index or key. 

E.g. If you want to store 5 numbers in an array,

        datatype arrayname [arraysize];

         int a[5];

A matrix is a multidimensional array which consists of columns and rows.

For the addition of two matrices, we need two matrices of same dimension, which means they should have same number of rows and columns.

For this Program, we declare the matrix as a 2D array.

| 1 1 1 1 |
| 2 3 5 2 |

Declaration of matrix as 2D array :

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

We use for loop for addition of the two matrices and store the addition values into the sum matrix.

For E.g.

sum[0][0] = MatrixA[0][0] + MatrixB[0][0], similarly,

sum[0][1] = MatrixA[0][1] + MatrixB[0][1] and so on.

Program :

public class AddTwoMatrix {
    
    public static void main(String [] args)
    {
        int rows = 2, columns = 4;
        
        //Declaring the two matrices as multi-dimensional arrays
        int[][] MatrixA = { {1, 1 , 1, 1}, {2, 3, 5, 2} };
        int[][] MatrixB = { {2, 3, 4, 5,}, {2, 2, 4, -4} };
        
        //Declaring a matrix sum, that will be the sum of MatrixA and MatrixB
        //The sum matrix will have the same rows and columns as the given matrices.
        
        int[][] sum = new int[rows][columns];
        for(int i = 0; i < rows; i++)
        {
            for(int j = 0; j < columns; j++)
            {
                sum[i][j] = MatrixA[i][j] + MatrixB[i][j];
            }
        }
        //Displaying the sum matrix
        System.out.println("Sum of the given matrices is:");
        for(int i =0; i < rows; i++)
        {
            for(int j =0; j < columns; j++)
            {
                System.out.print(sum[i][j] + "   ");
                
            }
            System.out.println();
        }
    }
    
}

Output :

Sum of the given matrices is:
3   4   5   6   
4   5   9   -2  

For Execution of the same, do visit my YouTube Channel :

Java Program To Convert Char Array To String

 


Java Program To Convert Char Array To String

In this Java Program, we convert the char array to String. 

Array is a data structure consisting of collections of elements each identified by atleast one array index or key. 

E.g. If you want to store 5 numbers in an array,

        datatype arrayname [arraysize];

         int a[5];

Logic : 1. Using String object: 
                 String str = new String(ch);

             2. Using ValueOf method.
                 String str2 = String.valueOf(ch);

Step 1 : Create an array of char and store the characters in it.

Step 2 : Create an object of String as str and store the characters of ch in it.

Step 3 : Output the object str.

Step 4 : Create object of String str and store characters in it by using ValueOf() method.

Step 5 : Output the object str.
              
Program :

public class CharArrayToString 
    {
        public static void main(String args[])
        {
        //Method 1 : Using String object
         char[] ch = { 'h', 'a','v','e','á','g', 'o', 'o', 'd', 'd', 'a', 'y'};
         String str = new String(ch);
         System.out.println(str);
         
         //Method 2 : Using valueOf method
         String str2 = String.valueOf(ch);
         System.out.println(str2);
        }
}

Output :

haveágoodday
haveágoodday

For execution of the same do visit my YouTube Channel :

Java Program To Reverse The Array

 


Java Program To Reverse The Array

In this Java Program, we reverse the array. In this program if a user enters numbers 1, 2, 3, 4, 5 then the program will reverse the array and the elements will be 5, 4, 3, 2, 1.  

Array is a data structure consisting of collections of elements each identified by atleast one array index or key. 

E.g. If you want to store 5 numbers in an array,

        datatype arrayname [arraysize];

         int a[5];

Step 1 : Import java.util.Scanner Class

Step 2 : Create and initialize variable i and j to 0, counter and temp.

Step 3 : Create an array named number and store value 100 in it.

Step 4 : Create the object of the Scanner class

Step 5 : Ask the user to the enter the number of elements he want to enter.

Step 6 : Store the user entered numbers in the variable counter

Step 7 : Apply for loop where i is equal o 0, i should be less than counter and increment i.
              This loop stores all the elements that we enter in an array number. First element is at number[0], second at number[1] and so on.

Step 8 : Print the enter array element by adding  1 int the i.

Step 9 : Store the user entered number in the array of number[i]

Step 10 : Decrement i by 1 and store it in j. Here we are writing the logic to swap first element with last element, second last element with the second element and so on. On the first iteration of the while loop i is the index of first element and j is the index of last. On the second iteration i is the index of the second and j is the index of the second last.

Step 11 : Initialize i to 0

Step 12 : Close the Scanner class to avoid any memory leak.

Step 13 : Apply while loop where i should be less than j

Step 14 : Store array number[i] in the temp variable

Step 15 : Store array of number[i] in array of number[j]

Step 16 : Store array of number [j] in variable temp.

Step 17 : Increment i & decrement j

Step 18 : Print reversed array

Step 19 : Apply for loop where i should be equal to 0, i should be less than counter and increment i

Step 20 : Print the array of number [i]

Program :

import java.util.Scanner;

public class ReverseArray 
    {
        public static void main(String args[])
        {
            int counter, i = 0, j = 0, temp;
            int number[] = new int[100];
            Scanner sc = new Scanner(System.in);
            System.out.print("How many elements you want to enter:");
            counter = sc.nextInt();
            
            for(i = 0; i < counter; i++)
            {
                System.out.print("Enter Array Element"+(i + 1)+": ");
                number[i] = sc.nextInt();
                
            }
            j = i - 1;
            i = 0;
            sc.close();
            while(i < j)
            {
                temp = number[i];
                number[i] = number[j];
                number[j] = temp;
                i++;
                j--;
                
            }
            
            System.out.print("Reversed array:");
            for(i = 0; i < counter; i++)
            {
                
                System.out.print(number[i]+" ");
            }
            
            
        }
    
}

Output: 

How many elements you want to enter:5
Enter Array Element1: 11
Enter Array Element2: 22
Enter Array Element3: 33
Enter Array Element4: 44
Enter Array Element5: 55
Reversed array:55 44 33 22 11

For execution of the same do visit my You Tube Channel :

Java Program To Sum the elements of the Array Entered By The User


Java Program To Sum the elements of the Array Entered By The User

In this Java Program, we sum up all the elements of the array entered by the user.

Array is a data structure consisting of collections of elements each identified by atleast one array index or key. 

E.g. If you want to store 5 numbers in an array,

        datatype arrayname [arraysize];

         int a[5];

Step 1 : Import java.util.Scanner Class

Step 2 : Create the object of the Scanner Class

Step 3 : Create and Initialize array

Step 4 : Create variable sum and initialize it to zero

Step 5 : Ask the user to enter the elements by using println method 

Step 6 : Apply for loop where i is equal to 0, i is less than 10 and increment i

Step 7 : Store the user entered elements in the array of i

Step 8 : Apply advanced for loop where num : array

Step 9 : Add sum and num and save its result in the variable sum

Step 10 : Print the Sum of the array elements.

Program :

import java.util.Scanner;
public class SumArray2 
    {
        public static void main(String[] args)
        {
            Scanner sc = new Scanner(System.in);
            int[] array = new int[10];
            int sum = 0;
            System.out.println("Enter the elements:");
            for(int i = 0; i<10; i++)
            {
                array[i] = sc.nextInt();
            }
            for(int num : array)
            {
                sum = sum + num;
            }
                System.out.println("Sum of array elements is:"+sum);
           
        }
    
}

Output :

Enter the elements:
1
2
3
4
5
6
7
8
9
10
Sum of array elements is:55

For Execution of the same do visit my YouTube Channel :

Java Program To Sum the elements of the Array


Java Program To Sum the elements of the Array

In this Java Program, we sum up all the elements of the array.

Array is a data structure consisting of collections of elements each identified by atleast one array index or key. 

E.g. If you want to store 5 numbers in an array,

        datatype arrayname [arraysize];

         int a[5];

Step 1 : Create and Initialize array

Step 2 : Create variable sum and initialize it to zero

Step 3 : Apply advanced for loop where int number : array

Step 4 : Add sum to num and store it in the variable sum

Step 5 : Print the Result

Program :

public class SumArray 
    {
        public static void main(String[] args)
        {
            int[] array = {10, 20, 30, 40, 50, 10};
            int sum = 0;
            //Advanced for loop
            for(int num : array)
            {
                sum = sum + num;
            }
            System.out.println("Sum of array elements is: "+sum);
        }
    
}

Output :

Sum of array elements is: 160

For the execution of the same do visit my YouTube Channel :

Woh Lamhe




                                                     






For video do visit my Youtube Channel :

https://youtu.be/mWzOAoRr8AQ





                


Java Program To Calculate Average of the Number using Array Entered by the User.


Java Program To Calculate Average of Number using Array Entered by the User.

In this Java Program, we calculate average of number using array entered by the user.

Average is a number that is calculated by adding all the numbers together and dividing the total by the number of quantities. It is also known as mean.

E.g. Average of 5 numbers :

       Average = 1 + 2 + 3 + 4 + 5 = 15 / 5 = 3

Array is a data structure consisting of collections of elements each identified by atleast one array index or key. 

E.g. If you want to store 5 numbers in an array,

        datatype arrayname [arraysize];

         int a[5];

Step 1 : Import java.util.Scanner

Step 2 : Ask user how many number he want to enter by using System.out.println method.

Step 3 : Create object of Scanner class

Step 4 : Create variable n and store the entered number of the user.

Step 5 : Create an array arr and store the contents of n in it.

Step 6 : Create a variable total and initialize it to 0

Step 7 : Apply for loop, where i is equal to zero, i should be less than length of the array and increment i.

Step 8 : Print the entered element number by adding 1 in it.

Step 9 : Store value of sc.nextDouble() into array of i.

Step 10 : Close the Scanner.

Step 11 : Apply another for loop, where i is equal to zero, i should be less than length of the array and increment i.

Step 12 : Add total + array of i and store it in total.

Step 13 : Display the Result.

Program :

import java.util.Scanner;

public class AverageArray2 
    {
        public static void main (String []args)
        {
            System.out.println("How many numbers you want to enter?");
            Scanner sc = new Scanner(System.in);
            int n = sc.nextInt();
            //Declaring array of n elements, the value of n is provided by the user
            
            double[] arr = new double[n];
            double total = 0;
            
            for(int i = 0; i<arr.length; i++)
            {
                System.out.print("Enter Element No."+(i+1)+": ");
                arr[i] = sc.nextDouble();
            }
            sc.close();
            for(int i = 0; i<arr.length; i++)
            {
                total = total + arr[i];
                
            }
            
            double average = total / arr.length;
            
            System.out.format("The average is : %.3f", average);
        }
    
}

Output :

How many numbers you want to enter?
5
Enter Element No.1: 12.7
Enter Element No.2: 18.9
Enter Element No.3: 20
Enter Element No.4: 13.923
Enter Element No.5: 16.225
The average is : 16.350

For execution of the same do visit my YouTube Channel :
ITEngineer8995
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