Displaying a .txt file in a TextArea...

hello everyone, i was wondering if you could help me with a problem i have.
basically, i have to type a word in a TextField that corresponds to a filename. i.e. type in 'results' and that will correspond to a file called 'results.txt'. once i type in this word, i click a button and this will open the file 'results.txt' into a TextArea below.
I have been working on this for several days now. I can figure out how to open the file into the TextArea, but it displays the file in there straight away. I need to make it so that the button has to be pressed first and then displays it.
It also needs to be able to do more than just one file. I have several files in a folder and depending on what i type in the TextField depends on which file is displayed.
I would appreciate ANY help at all on this as I am struggling quite alot.
Thnk you in advance
Troy

below is what i have so far, but it has one error. Could u help me with that?
import java.awt.*;
import javax.swing.*;
import java.io.*;
public class NorthPanel extends JPanel
JTextArea instruct;
String str;
BufferedReader br;
public NorthPanel()
setBackground(Color.white);
instruct = new JTextArea(5,60);
instruct.setLayout(new FlowLayout(FlowLayout.CENTER));
instruct.setBorder(BorderFactory.createTitledBorder("Java Work"));
instruct.setLineWrap(true);
instruct.setWrapStyleWord(true);
instruct.setEditable(false);
readFileIntoTextArea();
add(instruct);
private void readFileIntoTextArea()
try {
File f = new File("readme.txt");
br = new BufferedReader (new FileReader(f));
while ((str = br.readLine()) != null)
instruct.append(str);
}

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    correct me if it is a misunderstanding, but why don't you open the file (read in the content of a file in f.e. String text) , then you do a setText(text) ?
    in order to find out what was typed in you can choose getText()
    so far,
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