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 understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.