public class CaseofStrings
{

             
  public static void main(String[] args)
   {
    String sentence = "It's fun developing applications" +
                 " in the Java programming language.";
    char menuItem = 'A';
    
    switch (menuItem)
    {
    
    case 'A':
         if (sentence.length() > 0)
         {
           System.out.println(sentence.length());
          }
           else
           {
           System.out.println("Nothing to count");
           }
           break;
    case 'B':
         System.out.println(sentence.toUpperCase());
         break;
    case 'C':
         System.out.println(sentence.substring(40, 65));
         break;
    case 'D':
         System.out.println(sentence.replace('t', 'Z'));
         break;
         
     }
   }