Задание на java

package laba1;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.Timer;
 
public class main extends JFrame implements ActionListener {
    private static final int FORM_WIDTH = 400;
    private static final int FORM_HEIGHT = 400;
    private static final int BORDER_CORRECTION_X = 8;
    private static final int BORDER_CORRECTION_Y = 32;
    private static final int UP_BOARD = 0;
    private static final int DOWN_BOARD = FORM_HEIGHT - BORDER_CORRECTION_Y;
    private static final int LEFT_BOARD = 0;
    private static final int RIGHT_BOARD = FORM_WIDTH - BORDER_CORRECTION_X;
    private static int PX = 1;
        private static int PY = 1;
    private static final int TIMER_SPEED = 5;
 
    private laba1 laba1 = new laba1();
    private Timer timer = new Timer(TIMER_SPEED, this);
 
 
    public main() {
        setTitle("Лабораторна робота №1");
        getContentPane().setBackground(Color.green);
        setLayout(null);
        setResizable(false);
        setSize(FORM_WIDTH, FORM_HEIGHT);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
                addLaba1();
                timer.start();
    }
 
    private void addLaba1() {
        Random rnd = new Random();
        int xPos = rnd.nextInt(FORM_WIDTH - laba1.getWidth() - BORDER_CORRECTION_X);
        int yPos = rnd.nextInt(FORM_HEIGHT - laba1.getHeight() - BORDER_CORRECTION_Y);
        laba1.setBounds(xPos, yPos, laba1.getWidth(), laba1.getHeight());
        getContentPane().add(laba1);
    }
    private void Laba1sMovement() {
        if(laba1.getY()==UP_BOARD) {
                 PY=-PY;
                 laba1.setLaba1Color(Color.RED);
                }
                    
                if (laba1.getY()+laba1.getHeight()==DOWN_BOARD) {
                    PY=-PY;
                    laba1.setLaba1Color(Color.BLUE);
                }
 
                if (laba1.getX()==LEFT_BOARD){
                    PX=-PX;
                    laba1.setLaba1Color(Color.YELLOW);
                }
 
                if (laba1.getX()+laba1.getWidth()==RIGHT_BOARD){
                    PX=-PX;
                    laba1.setLaba1Color(Color.WHITE);
                }
                laba1.setBounds(laba1.getX() + PX, laba1.getY() + PY, laba1.getWidth(), laba1.getHeight());
            
        }
 
    public void actionPerformed(ActionEvent e) {
        Laba1sMovement();
    }
 
    public static void main(String[] args) {
        new main();
    }
}