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
import java.util.Scanner;
public class RansariChangeCase
{
public static void main(String args[])
{
Scanner in = new Scanner(System.in);
System.out.println("Enter a string:");
String str = in.nextLine();
int len = str.length();
String rev = "";
for (int i = 0; i < len; i++)
{
char ch = str.charAt(i);
if (Character.isLetter(ch))
{
if(Character.isUpperCase(ch))
{
rev += Character.toLowerCase(ch);
}
else
{
rev += Character.toUpperCase(ch);
}
}
else
{
rev += ch;
}
}
System.out.println(rev);
}
}First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.