Java

import javax.swing.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class bruce_tanner_A3Q3
{
	public static void main(String [] args)
	{
		String input;
		do
		{
			input = getString("Enter a string");
			printOutput(fixErrors(input));
		}while(checkForError(input));
	}

	//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)
	{
		if(checkForError(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;
		}
		return "This string is error free";
	}
}

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");
}

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;
}

<small><br />
CLASS PLARENTS .. <br />
<br />
package com;<br />
//this class is the one that i used to retrieve the data.. <br />
import java.io.*;<br />
import java.sql.*;<br />
import javax.servlet.jsp.*;<br />
import javax.servlet.jsp.tagext.*;<br />
<br />
public class Parents {<br />
    <br />
    public String[] lastname;<br />
    public String[] firstname;<br />
    public String[] middlename;<br />
    public String[] relation;<br />
    <br />
    private Connection connection = null;<br />
    private Statement statement = null;<br />
    private ResultSet rs = null;<br />
    Connect con = new Connect();<br />
    int count = 0;<br />
    <br />
    public Parents(){}<br />
    <br />
    public Parents(int idno) {<br />
        int i = 0;<br />
        try {<br />
            Class.forName("com.mysql.jdbc.Driver").newInstance();<br />
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/sis",con.user,con.password);<br />
            statement = connection.createStatement();<br />
            rs = statement.executeQuery("SELECT * FROM guardians WHERE studidno='" + idno + "'");<br />
            <br />
            if (rs.last()) {<br />
                count = rs.getRow();<br />
            }<br />
            <br />
            lastname = new String[count];<br />
            firstname = new String[count];<br />
            middlename = new String[count];<br />
            relation = new String[count];<br />
<br />
            while (rs.next()){<br />
               lastname[i] = rs.getString("lastname");<br />
               firstname[i] = rs.getString("firstname");<br />
               middlename[i] = rs.getString("middlename");<br />
               relation[i] = rs.getString("relation");<br />
               i++;<br />
            }<br />
<br />
        } catch (Exception e) {<br />
            e.printStackTrace();<br />
        }<br />
    }<br />
<br />
    //setters in here.. <br />
    <br />
    public String[] getLastname(){return lastname;}<br />
    <br />
    public String[] getFirstname () {return firstname;}<br />
    <br />
    public String[] getMiddlename () {return middlename;}<br />
    <br />
    public String[] getRelation () {return relation;}<br />
    <br />
}</small>

<small> <% <br />
Parents p = new Parents(info.getIdno());<br />
for (int i = 0; i < p.getFirstname().length; i++ ) {<br />
                        %><br />
                        <tr bgcolor="#fefce3"><br />
                           <td><br />
                                   <p id="info"><br />
                                    <%= p.getLastname() %><br />
                                   </p><br />
                                   <p id="record">Relationship:<br />
                                    <span id="relationship"><br />
                                      <%= p.getFirstname() %><br />
                                    </span><br />
                                   </p><br />
                            </td><br />
                            <br />
                        </tr><br />
                        <tr><br />
                            <td> </td><br />
                        </tr><br />
                        >% } %></small>