Removing whitespaces

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Main

   public static void main(String[] argv) throws Exception

      String ExString = "This is a Java program.

      This is another Java Program.";

      String result=removeDuplicateWhitespace(ExString);

      System.out.println(result);

   public static CharSequence

   removeDuplicateWhitespace(CharSequence inputStr)

      String patternStr = "\\s+";

      String replaceStr = " ";

      Pattern pattern = Pattern.compile(patternStr);

    Matcher matcher = pattern.matcher(inputStr);

 return matcher.replaceAll(replaceStr);

Matching Phone Numbers

public class MatchPhoneNumber

   public static void main(String args[])

      isPhoneValid("1-999-585-4009");

      isPhoneValid("999-585-4009");

      isPhoneValid("1-585-4009");

      isPhoneValid("585-4009");

      isPhoneValid("1.999-585-4009");

      isPhoneValid("999 585-4009");

      isPhoneValid("1 585 4009");

      isPhoneValid("111-Java2s");

   public static boolean isPhoneValid(String phone)

      boolean retval = false;

      String phoneNumberPattern =

      "(\\d-)?(\\d{3}-)?\\d{3}-\\d{4}";

      retval = phone.matches(phoneNumberPattern);

      String msg = "No match: pattern:" + phone

      + "\r\n regex: " + phoneNumberPattern;

      if (retval)

         msg = " Match: pattern:" + phone

         + "\r\n regex: " + phoneNumberPattern;

      System.out.println(msg + "\r\n");

      return retval;