looping for specified amount of time

[System_Error]

A Simple program i made has a text box were you specify the number of times to make the loop, a text box of the text to display in the loop and this is displayed in a JTextArea. It might be easer if i post the code:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;

public class LoopApplet extends JApplet implements ActionListener 
{
  JButton perform;
  JLabel timesLabel;
  JLabel textLabel;
  JTextField txtNumOfTimes;
  JTextField txtText;
  JTextArea message;
  
  public void init() 
  {
	Container pane = getContentPane();
	FlowLayout flo = new FlowLayout();
	pane.setLayout(flo);
	
	JPanel row1 = new JPanel();
	timesLabel = new JLabel("# of Times");
	row1.add(timesLabel);
	txtNumOfTimes = new JTextField(15);
	row1.add(txtNumOfTimes);
	pane.add(row1);	
	
	JPanel row2 = new JPanel();
	textLabel  = new JLabel("Text :");
	row2.add(textLabel);
	txtText = new JTextField(15);
	row2.add(txtText);
	pane.add(row2);
	
	JPanel row3 = new JPanel();
	perform = new JButton("Perform");
	perform.addActionListener(this);
	row3.add(perform);
	pane.add(row3);

	JPanel row4 = new JPanel();
	message = new JTextArea(5,15);
	message.setLineWrap(true);
        message.setWrapStyleWord(true);
        JScrollPane scroll = new JScrollPane(message, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        row4.add(scroll);
	pane.add(row4);
	setContentPane(pane);
	setVisible(true);
  }

  public void actionPerformed(ActionEvent e) 
  {
	String num = txtNumOfTimes.getText();
	int numTimes = Integer.parseInt(num);
	
	String text = txtText.getText();
   String source = e.getActionCommand();
	 try {
	 	for (int x=0; x<numTimes; x++)
		{
			message.append(x + " " + text + "\n");
		}

	     } catch (NumberFormatException nfe)
	       {
			txtText.setText("NumberFormatException");
		}
 }

I want to change the code in the actionperformed event so that it loops for an amount of time(what the user inputs in the textbox) but i have failed every time i try this. I know how to loop for a given amount of time but not sure how to apply it to this. Here is an example of looping for 1minute.

import java.util.*;

class Repeat {
  public static void main(String[] arguments) {
   String sentence = "poop";
   int count = 1;
   Calendar start = Calendar.getInstance();
   int startMinute = start.get(Calendar.MINUTE);
   int startSecond = start.get(Calendar.SECOND);
   start.roll(Calendar.MINUTE, true);
   int nextMinute = start.get(Calendar.MINUTE);
   int nextSecond = start.get(Calendar.SECOND);
   while (count < 1000000) {
     System.out.println(sentence);
     GregorianCalendar now = new GregorianCalendar();
      if (now.get(Calendar.MINUTE) >= nextMinute)
         if (now.get(Calendar.SECOND) >+ nextSecond)
             break;
        count++;
   }
   System.out.println("\nDisplayed " + count
                       + " times. ");
 }
}

How could i make this into my program??????????