3 errors and then terminate program

[hezfast2]

Hello all, I'm writing a program that inputs a string of letters and lets the user get the length of the string and/or the number of vowels and consonants in the string (oh, spaces are allowed as input). I have been able to validate my input, but here's the catch, I need the program to terminate when the user chooses to, which it does, and I need the program to terminate after either button is pushed three times with invalid input. You see how I have it set up now, it obviously resets the counter each time the button is pushed. Any suggestions?

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

public class LetterStringManip extends JFrame
{
     private JLabel stringOfLettersL, lengthL, lengthRL, vowelsL, vowelsRL,                consonantsL, consonantsRL;
	  private JTextField stringOfLettersTF;
	  private JButton lengthB,vowelB, quitB;
	  private LengthButtonHandler lbHandler;
	  private VowelButtonHandler vbHandler;
	  private QuitButtonHandler qbHandler;
	  private static final int WIDTH = 750;
	  private static final int HEIGHT = 150;
	  
	  public LetterStringManip()
	  {
	      stringOfLettersL = new JLabel("Enter a String of Letters", SwingConstants.CENTER);
			lengthL = new JLabel("Length of String: ", SwingConstants.CENTER);
			lengthRL = new JLabel("", SwingConstants.LEFT);
			vowelsL = new JLabel("Number of Vowels: ", SwingConstants.CENTER);
			vowelsRL = new JLabel("", SwingConstants.LEFT);
			consonantsL = new JLabel("Number of Consonats: ", SwingConstants.CENTER);
			consonantsRL = new JLabel("", SwingConstants.LEFT);
			
			stringOfLettersTF = new JTextField(15);
		
			lengthB = new JButton("Length");
			lbHandler = new LengthButtonHandler();
			lengthB.addActionListener(lbHandler);
			
			vowelB = new JButton("Vowels");
			vbHandler = new VowelButtonHandler();
			vowelB.addActionListener(vbHandler);
			
			quitB = new JButton("Quit");
			qbHandler = new QuitButtonHandler();
			quitB.addActionListener(qbHandler);
			
			setTitle("String Of Letters");
			
			Container pane = getContentPane();
			
			pane.setLayout(new GridLayout(3,4)); 
			
			pane.add(stringOfLettersL);
			pane.add(stringOfLettersTF);
			pane.add(lengthL);
			pane.add(lengthRL);
			pane.add(vowelsL);
			pane.add(vowelsRL);
			pane.add(consonantsL);
			pane.add(consonantsRL);
			pane.add(lengthB);
			pane.add(vowelB);
			pane.add(quitB);
	
			
			setSize(WIDTH, HEIGHT);
			setVisible(true);
			setDefaultCloseOperation(EXIT_ON_CLOSE);
			
	  }
	  
	  private class LengthButtonHandler implements ActionListener
	  {
	      public void actionPerformed(ActionEvent e)
			{
				int errorCount = 0;
				boolean errorCheck = false;

				getLength();
				
				if (errorCheck = true)
				{
				    errorCount++;
				}
				while (errorCount > 1)
				{
				    System.exit(0);
				}
				  
			}
			
	  }
	  
	  private class VowelButtonHandler implements ActionListener
	  {
	      public void actionPerformed(ActionEvent e)
			{
				int errorCount = 0;
				boolean errorCheck;

				getVowels();
				
				if (errorCheck = true)
				{
				    errorCount++;
				}
				while (errorCount > 1)
				{
				    System.exit(0);
				}
			}
			
	  }
	  
	  private class QuitButtonHandler implements ActionListener
	  {
	      public void actionPerformed(ActionEvent e)
			{
			    System.exit(0);
				 
			}
			
	  }
	  
	  		public boolean getLength()
			{ 
			    String letString = (stringOfLettersTF.getText()), lengthString;
             int length = letString.length(), i;
				 boolean errorCheck = false;
				 char[] letter = new char[length];
					  
             for (i = 0; i < letString.length(); i++)
				 {
                 letter[i] = letString.charAt(i);
				     if ((Character.isLetter(letter[i]) == true) || (letter[i]==' '))
					  {			 
				         lengthString = Integer.toString(length);
					      vowelsRL.setText(" ");
					      consonantsRL.setText(" ");
				         lengthRL.setText(lengthString);
					  }
					  else
					  {
                     vowelsRL.setText(" ");
					      consonantsRL.setText(" ");
				         lengthRL.setText("INVALID INPUT!");
							errorCheck = true;
						}
			     }
				  return errorCheck;
			 }
	  
	  		public boolean getVowels()
			{     
             String letString = (stringOfLettersTF.getText()), vowString, conString;
             int i, countVow = 0, countCon = 0, countSpace = 0, length = letString.length();
				 char[] letter = new char[length];
				 boolean errorCheck = false;
		  
             for (i = 0; i < letString.length(); i++)
				 {
                 letter[i] = letString.charAt(i);
					  if ((Character.isLetter(letter[i]) == true) || (letter[i] == ' '))
					  {
                     if (letter[i]=='a' || letter[i]=='e' || letter[i]=='i' || letter[i]=='o' || letter[i]=='u')
                     countVow++;
					      if (letter[i]==' ')
					      countSpace++;
							
					      countCon = (letString.length() - countVow) - countSpace;
                     vowString = Integer.toString(countVow);
				         conString = Integer.toString(countCon);
							lengthRL.setText(" ");
				         vowelsRL.setText(vowString); 
				         consonantsRL.setText(conString);
					  }
					  else
					  {
							errorCheck = true;
						}
				 }
				 return errorCheck;
         }
			 
	  public static void main(String[] args)
	  {
	      LetterStringManip stringObject = new LetterStringManip();
			
	  }
	  
}

[hezfast2]

where would I place a counter to count number of invalid inputs so that the program terminates after 3 tries in a JButton handler so that it doesn't reset each time the button is used?

[hezfast2]

I figured it out, thanks anyway