Define a class to accept a string, and print the characters with the uppercase and lowercase reversed, but all the other characters should remain the same as before

Define a class to accept a string, and print the characters with the uppercase and lowercase reversed, but all the other characters should remain the same as before.

EXAMPLE:

INPUT: WelCoMe_2022

OUTPUT: wELcOmE_2022

Video Link:

YouTube Video

Solution:

import java.util.Scanner;

public class Year2022Q1

{

    public static void main(String[] args)

    {

       

        Scanner sc = new Scanner(System.in);

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

        String str = sc.nextLine();

        String newStr="";

        int len=str.length();

//      Method 1

        for(int i=0;i<len;i++)

        {

            char ch=str.charAt(i);

            if(Character.isUpperCase(ch))

                newStr = newStr + Character.toLowerCase(ch);

            else if(Character.isLowerCase(ch))

                newStr += Character.toUpperCase(ch);

            else

                newStr+=ch;

        }

       

//      Method 2

        for(int i=0;i<len;i++)

        {

            char ch=str.charAt(i);

            if(ch>='A' && ch<='Z')

                newStr = newStr + Character.toLowerCase(ch);

            else if(ch>='a' && ch<='z')

                newStr += Character.toUpperCase(ch);

            else

                newStr+=ch;

        }

        System.out.println(newStr);

    }

}

Output: