java programming question


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  1. #1
    Join Date
    Nov 2008
    Posts
    1

    java programming question

    So i was wondering...i wrote the following code using regular expressions and i wanted to know if it could be done using substring() and indexOf methods...here is my code.....

    Occasionally, backspaces in text are not handled properly, and appear as part of
    a String. This question asks you to handle the backspaces in a String. Your input
    will be a string which contains upper and lower case letters, spaces and
    punctuation, as well as the additional symbol @. This symbol represents that
    the user typed in a backspace, and that the previous character should be
    ignored. So for instance, if the user types in Hej@llo..output would be Hello
    Code:
    import javax.swing.*;
    import java.util.regex.Pattern;
    import java.util.regex.Matcher;
    
    public class A3Q3
    {
        public static void main(String [] args)
             {
        String input;                                                    //The main method of this program only contains the input string which get's
        for(input = getString("Enter a string"); checkForError(input); input = getString("Enter a string"))    //it's value from the method 'getString'. It then
        {                                                                //
            printOutput(fixErrors(input));
        }
        printOutput("This string is error free");
            }
        //Returns true if specified string has an error ('@' in it) and false
        //if it does not.
        public static boolean checkForError(String input)
        {
            Pattern pattern = Pattern.compile("@");
            Matcher matcher = pattern.matcher(input);
    
            return matcher.find();
        }
    
        //Prompts the user for a string with the specified input
        //Returns the input string
        public static String getString(String input)
        {
            String tempString = JOptionPane.showInputDialog(input);
            return tempString;
        }
    
        //Prints the specified message
        public static void printOutput(String tempString)
        {
            System.out.println(tempString);
        }
    
        //Fixes any errors in the input string
        public static String fixErrors(String tempString)
            {
        Pattern pattern = Pattern.compile("[^@][@?+]");
        Matcher matcher = pattern.matcher(tempString);
        
        while(matcher.find())
        {
            tempString = matcher.replaceAll("");
            matcher = pattern.matcher(tempString);
        }
    
        pattern = Pattern.compile("@");                //This block gets rid of any extra @'s left over.
        matcher = pattern.matcher(tempString);
        tempString = matcher.replaceAll("");
    
        return tempString;
          }
    }
    Last edited by Hack; 11-07-2008 at 07:15 AM. Reason: Added Code Tags

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