toggleChar.java

//Question: Toggle the characters of a string (uppercase characters-> lowercase character & lowercase char-> uppercase char)
package stringBuilder;
import java.util.Scanner;
public class toggleChar {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter the String: ");
        StringBuilder sb = new StringBuilder(scan.nextLine());
        for (int i = 0; i < sb.length(); i++) {
            char ch = sb.charAt(i);
            int Ascii = (int) ch;        // Type casting (char-> int)
            if(Ascii>=65 && Ascii<=90){  // Capital 
                Ascii += 32;             // we have to add ascii value 32 to get lower character
                ch = (char) Ascii;       // Type casting (int-> char)
                sb.setCharAt(i, ch);
            }else{  // Lowercase 
                Ascii = Ascii - 32;
                ch = (char) Ascii;
                sb.setCharAt(i, ch);
            }
        }
        System.out.println("After toggling: " + sb);
    }
}