Skeleton3.java here

This version assumes the availability of the booksite's StdIn.class and StdOut.class.

/**
 * program Skel3
 * it just loops and loops
 * it's a safe start for a small Java program
 * modified to use Sedgewick/Wayne StdIn and StdOut classes
 *
 * files StdIn.class, StdOut.class assumed to be
 * either in same directory or in classpath
 *
 * @date fall 2008
 * @author N V Fitton, vfitton@nvcc.edu
 */
public class Skel3 {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
              
  // string object for user input to control loop
  String keysIn;

  // replace with your introduction 
  StdOut.println("\n\t Program introduction...");

  do
  {
   // --- snip ---------------------------------
   // --- replace with your programming exercise
   
   StdOut.println("\n\t Program body...\n");
   
   // --- snip ---------------------------------

   StdOut.print("\n\t Do it again [y/n]? ");
   keysIn = StdIn.readString();
  }
  while (keysIn.startsWith("y") || keysIn.startsWith("Y"));
  // end do loop
    
  // remove whatever remains in StdIn:
  // at minimum, there's still a newline
  
  while ((StdIn.readChar()) != '\n')
   ;
  
  StdOut.print( "\n\t Program ending." 
   + " Please press the Enter key...");
  
  while ((StdIn.readChar()) != '\n')
   ;
    }
}