Java Program to reverse a number | 3 ways to reverse a Number in Java

Reverse A Number In Java | 3 Ways To Reverse A Number In Java

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Way - 1

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public class Reverse1 {

    public static void main(String[] args) {

        // Get a Number From Console

        System.out.println("Enter a Number:");

        Scanner sc = new Scanner(System.in);

        int num = sc.nextInt();

        int reverseNumber = 0;

        while (num != 0) {

            reverseNumber = reverseNumber * 10 + num % 10;

            num = num / 10;

        }

        System.out.println("Reverse Number is:" + reverseNumber);

    }

}

Way -2

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public class Reverse2 {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the Number:");

        Integer number = sc.nextInt();

        String num = String.valueOf(number); // Convert the number into String Format

        StringBuffer rev;

        StringBuffer sb = new StringBuffer(num); // It Creates the StringBuffer Object with specified String

        rev = sb.reverse(); // apply reverse method on the StringBuffer Object

        System.out.println("The reverse of the Number is:" + rev);

    }

}

Way -3

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import java.util.Scanner;

public class Reverse3 {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the Number:");

        Integer number = sc.nextInt();

        String num = String.valueOf(number); // Convert the number into String Format

        StringBuilder sbl = new StringBuilder();

        sbl.append(num); // accepts number string value and appends to the StringBuilder Object

        StringBuilder rev = sbl.reverse(); // just apply reverse method to reverse the Number

        System.out.println("The reverse of the Number is:" + rev);

    }

}