Prints out string if string length is even; prints out reversed copy of string if string length is odd.

StringOddEven.java

import javax.swing.JOptionPane;

public class StringOddEven {
    public static void main(String args[]) {
        String input = JOptionPane.showInputDialog("Please enter a string.");
        int length = input.length();

        if (length % 2 == 0) {
            System.out.println(input);
        } else {
            int i = length - 1;
            
            // Using a DO-WHILE loop for this program.
            do {
                System.out.print(input.charAt(i));
                i--;
            } while (i >= 0); // end do-while
        } // end if
    } // end main
} // end class