MyConsole

how to use

public class Main {
    public static void main(String[] args) {
        int myInt = MyConsole.readInt("enter int: ");
        double myDouble = MyConsole.readDouble("enter double: ");
        String myString = MyConsole.readString("enter word: ");

        System.out.println("\nint is: " + myInt);
        System.out.println("double is: " + myDouble);
    }
}

enter int:  4.5
Not an integer. Please try again!
enter int:  7
enter double:  10.51

int is: 7
double is: 10.51
string is: hello

MyConsole.java

 /**

 * An easy interface to read numbers and strings from 
 * standard input
 * @version 1.10 10 Mar 1997
 * @author Cay Horstmann
   */

public class MyConsole
{  /**
    * 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 if ((char)ch != '\r') // weird--it used to do \r\n translation
               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.isWhitespace((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!");
         }
      }
   }
}