java program to convert char array to String

java program to convert char array to String

public class ConvertCharArrayToString {

       public static void main(String[] args) {

              char[] charArr = { 'w', 'e', 'l', 'c','o','m','e',' ','R', 'a',' j' };

              String str = new String(charArr);

              System.out.println("converted String is:" + str);

              String str1 = String.valueOf(charArr);

              System.out.println("covnverted String is:" + str1);

       }

}

OUTPUT
converted String is:welcome Raj
covnverted String is:welcome Raj

java program to convert String to char array

java program to convert String to char array

public class ConvertStringToCharArray {

       public static void main(String[] args) {

              String str="welcome Raj";

              char[] charArr=str.toCharArray();

              for(char temp:charArr){

                     System.out.println(temp);

              }

       }

}

OUTPUT

w

e

l

c

o

m

e

R

a

j

Reverse Array Elements in Java

Reverse Array Elements in Java

public class ReverseArray {

       public static void main(String[] args) {

              int[] intArr = new int[] { 1, 2, 3, 4, 5, 6, 7 };

              System.out.println("Array elements before reverse");

              displayArrayElements(intArr);

              reverseArrayElements(intArr);

              System.out.println("reversed array elements");

              displayArrayElements(intArr);

       }

       public static void displayArrayElements(int[] arr) {

              for (int temp : arr) {

                     System.out.println(temp);

              }

              System.out.println("..............................");

       }

       public static void reverseArrayElements(int[] arr) {

              int temp = 0;

              for (int start = 0, end = arr.length - 1; start < end; start++, end--) {

                     temp = arr[start];

                     arr[start] = arr[end];

                     arr[end] = temp;

              }

       }

}

output

Array elements before reverse
1
2
3
4
5
6
7
..............................
reversed array elements
7
6
5
4
3
2
1
..............................

Find Minimum and Maximum value of Array in Java

Find Minimum and Maximum value of Array in Java

public class FindMinAndMaxValueInArray {

       public static void main(String[] args) {

              int arr[] = { 69, 23, 47, 81, 92, 88, 52, 48, 56, 66, 65, 76, 71, 85,

                           49, 53, 56, 61, 65, 84 };

              findMaxValue(arr);

              findMinValue(arr);

       }

       public static void findMinValue(int[] arr) {

              int min = arr[0];

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

                     if (min > arr[i]) {

                           min = arr[i];

                     }

              }

              System.out.println("minimum value of the array is:" + min);

       }

       public static void findMaxValue(int[] arr) {

              int max = arr[0];

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

                     if (max < arr[i]) {

                           max = arr[i];

                     }

              }

              System.out.println("maximum value of array is:" + max);

       }

}

output

maximum value of array is:92
minimum value of the array is:23

Find Duplicates in an array

Find Duplicates in an array

package com.blogspot.rajvishwakarma15;

public class CheckDuplictesInArray {

       public static void main(String[] args) {

              String[] strArr = new String[] { "a", "b", "c", "s", "d", "e", "a",

                           "b", "s" };

              detectDuplicates(strArr);

       }

       public static void detectDuplicates(String[] arr) {

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

                     for (int j = i + 1; j < arr.length; j++) {

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

                      System.out.println("Duplicate found! Original was at location "

                               + (i + 1) + " and match is at " + (j + 1));

                                  System.out.println("Duplicated value is:" + arr[j]);

                           }

                     }

              }

       }

}

OUTPUT

Duplicate found! Original was at location 1 and match is at 7 Duplicated value is:a

Duplicate found! Original was at location 2 and match is at 8 Duplicated value is:b

Duplicate found! Original was at location 4 and match is at 9 Duplicated value is:s

Write a program to find the given number is Armstrong number or not?

Find the given number is Armstrong number or no ?

Description:

Armstrong numbers are the sum of their own digits to the power of the number of digits. It is also known as narcissistic numbers.

package com.blogspot.rajvishwakarma18; public class MyArmstrongNumber {       public boolean isArmstrongNumber(int number){                   int tmp = number;         int noOfDigits = String.valueOf(number).length();         int sum = 0;         int div = 0;         while(tmp > 0)         {             div = tmp % 10;             int temp = 1;             for(int i=0;i<noOfDigits;i++){                 temp *= div;             }             sum += temp;             tmp = tmp/10;         }         if(number == sum) {             return true;         } else {             return false;         }     }           public static void main(String a[]){         MyArmstrongNumber man = new MyArmstrongNumber();         System.out.println("Is 371 Armstrong number? "+man.isArmstrongNumber(371));         System.out.println("Is 523 Armstrong number? "+man.isArmstrongNumber(523));         System.out.println("Is 153 Armstrong number? "+man.isArmstrongNumber(153));     } }

Output: Is 371 Armstrong number? true Is 523 Armstrong number? false Is 153 Armstrong number? true