Thread: Button help, confusing error.

So in my CS class we made a simple program to sort a list of names then re-write the names into a new file. It was really easy and I finished pretty fast. But then I decided to make it GUI with awt so I added 1 button that does everything it did. But I'm getting this error and I don't know how to fix it

actionPerformed(java.awt.event.ActionEvent) in SortMe cannot implement actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener; overridden method does not throw java.io.IOException
public void actionPerformed(ActionEvent e) throws IOException

Will someone review my source file and tell me what exactly I'm doing wrong?

import java.io.*;
import java.util.Arrays;
import java.awt.*;
import java.awt.event.*;
 
 
public class SortMe extends Frame implements ActionListener
{
    private static String names[];
    private static int fileSize;
    private static int tick = 0;
    private Button b;
    private BufferedReader input;
    private BufferedWriter output;
 
    public SortMe()
    {
        super("Sorting Names");
        Frame f = new Frame();
        b = new Button("Sort!");
	f.add(b);
        b.addActionListener(this);
    }
 
//----------------------------------------------------------------------------
 
    public void actionPerformed(ActionEvent e) 
    {
        if (e.getSource() == b)
        {
             perform();
        }
    }
 
//-----------------------------------------------------------------------------
 
    public void perform() 
    {
            names = new String[100];
            readFile("Names1.txt");
            displayArray();
            sortArray();
            displayArray();
            writeFile("Names2.txt");
    }
 
//-------------------------------------------------------------------------------
 
    public static void main (String args[])
    {
 
        SortMe app = new SortMe();
        app.addWindowListener(
        new WindowAdapter() { public void windowClosing(          WindowEvent e )
        {
        System.exit( 0 );
        }
        }
        );
    }
 
//-------------------------------------------------------------------------------
 
    public void readFile(String fileName) 
    {
        input = new BufferedReader(new FileReader(fileName));
        int i = 0;
        String in = input.readLine();
        while (in !=null)
        {
            names[i] = in;
            i++;
            tick++;
            in = input.readLine();
        }
 
            input.close();
    }
 
//-------------------------------------------------------------------------------
 
    public static void displayArray()
    {
 
        for (int x =0; x <= names.length-1; x++)
        {
            if (names[x] != null)
            System.out.println(names[x]);
        }
 
    }
 
//-------------------------------------------------------------------------------
 
    public static void sortArray()
    {
        int tempCount = 0;
        String temp = "";
        for (int x = 1; x < tick; x++)
            for (int y = 0; y < tick-x; y++)
            {
                String s = names[y];
                String s1 = names[y+1];
                tempCount = 1;
                while (tempCount != 0)
                {
                    if (s.equals(s1))
                        tempCount = 0;
                    else
                        if (s.charAt(tempCount-1) ==  s1.charAt(tempCount-1))
                        {
                            tempCount++;
                        }
                        else
                        {
                            if (s.charAt(tempCount-1) > s1.charAt(tempCount-1))
                            {
                                temp = names[y];
                                names[y] = names[y+1];
                                names[y+1]= temp;
                            }
                            tempCount = 0;
 
 
                    }
                }
            }
 
 
    }
 
//-------------------------------------------------------------------------------
 
    public void writeFile(String fileName) throws IOException
    {
            output = new BufferedWriter(new FileWriter(fileName));
            for (int x = 0; x < tick; x++)
            if (names[x] != null)
            {
                output.write(names[x]);
                output.newLine();
            }
 
            output.close();
    }
 
}