Problem with variable in a for loop in a Chessboard project.

Question

Hi, im having trouble with a chessboard project. I am trying to get the chessboard to be able to increase and decrease in size when the user enters a number. But it seems as if the program is freezing. Here is my code
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class chessboard extends Applet implements ActionListener {
     public  TextField pieces;
     int x;
     int y;
     int n;
     int size = 0;
     public void init() {
          pieces = new TextField(5);
        add(pieces);
        pieces.addActionListener(this);
     public void actionPerformed(ActionEvent e) {
        size = Integer.parseInt(pieces.getText());
        repaint();
     public void paint(Graphics g) {
           x = 40;
           y = 40;
           n = 0;
          ///Problem i think     
          for(y = 40; y < 400; y = y+size  ){                    
                //y = y + size;
                  n++;
               for(x = 40; x < 400; x = x+size){
                    //x= x +size;
                    n++;
               if (n % 2 == 0){
                    g.setColor(Color.BLACK);
               else {
                    g.setColor(Color.WHITE);
               g.fillRect(x,y,size,size);     
               }//end nested for
          }//end for
          g.drawRect(40,40,size*8,size*8);
          g.drawString("Enter size of Squares in Pixels",40,20);
     }//end paint
}//end class

Answer 1

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Chessboard extends Applet implements ActionListener {
    private TextField pieces;
    private int size = 0;
    public void init() {
        pieces = new TextField(5);
        add(pieces);
        pieces.addActionListener(this);
    public void actionPerformed(ActionEvent e) {
        size = Integer.parseInt(pieces.getText());
        repaint();
    public void paint(Graphics g) {
        if (size > 0) {
            drawBoard(g);
    private void drawBoard(Graphics g) {
        int n = 0;
        for(int y = 40; y < 400; y += size){
            n++;
            for(int x = 40; x < 400; x += size){
                n++;
                g.setColor(n % 2 == 0 ? Color.BLACK : Color.WHITE);
                g.fillRect(x,y,size,size);
        g.drawRect(40,40,size*8,size*8);
        g.drawString("Enter size of Squares in Pixels",40,20);
}