poo-java/Console.java at master · wgbn/poo-java · GitHub

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public class Console
{  /**
    * print a prompt on the console but don't print a newline
    * @param prompt the prompt string to display
    */

   public static void printPrompt(String prompt)
   {  System.out.print(prompt + " ");
      System.out.flush();
   }

   /**
    * read a string from the console. The string is
    * terminated by a newline
    * @return the input string (without the newline)
    */

   public static String readString()
   {  int ch;
      String r = "";
      boolean done = false;
      while (!done)
      {  try
         {  ch = System.in.read();
            if (ch < 0 || (char)ch == '\n')
               done = true;
            else
               r = r + (char) ch;
         }
         catch(java.io.IOException e)
         {  done = true;
         }
      }
      return r;
   }

   /**
    * read a string from the console. The string is
    * terminated by a newline
    * @param prompt the prompt string to display
    * @return the input string (without the newline)
    */

   public static String readString(String prompt)
   {  printPrompt(prompt);
      return readString();
   }

   /**
    * read a word from the console. The word is
    * any set of characters terminated by whitespace
    * @return the 'word' entered
    */

   public static String readWord()
   {  int ch;
      String r = "";
      boolean done = false;
      while (!done)
      {  try
         {  ch = System.in.read();
            if (ch < 0
               || java.lang.Character.isSpace((char)ch))
               done = true;
            else
               r = r + (char) ch;
         }
         catch(java.io.IOException e)
         {  done = true;
         }
      }
      return r;
   }

   /**
    * read an integer from the console. The input is
    * terminated by a newline
    * @param prompt the prompt string to display
    * @return the input value as an int
    * @exception NumberFormatException if bad input
    */

   public static int readInt(String prompt)
   {  while(true)
      {  printPrompt(prompt);
         try
         {  return Integer.valueOf
               (readString().trim()).intValue();
         } catch(NumberFormatException e)
         {  System.out.println
               ("Not an integer. Please try again!");
         }
      }
   }

   /**
    * read a floating point number from the console.
    * The input is terminated by a newline
    * @param prompt the prompt string to display
    * @return the input value as a double
    * @exception NumberFormatException if bad input
    */

   public static double readDouble(String prompt)
   {  while(true)
      {  printPrompt(prompt);
         try
         {  return Double.valueOf
               (readString().trim()).doubleValue();
         } catch(NumberFormatException e)
         {  System.out.println
         ("Not a floating point number. Please try again!");
         }
      }
   }
}