algem sabe por que não consigo adicionar a classe na frame como o método add??
public class main extends JPanel {
public static final int WIDTH = 640;
public static final int HEIGHT = 480;
public static void main(String[] args) {
JFrame frame = new JFrame();
Logica l = new Logica();
frame.setSize(WIDTH, HEIGHT);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// ??????
frame.add(l);
frame.setVisible(true);
}
}
package revisao;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
public class Logica {
public BufferedImage img;
public Graphics2D g2;
public Logica(){
img = new BufferedImage(main.WIDTH, main.HEIGHT, BufferedImage.TYPE_INT_RGB);
g2 = (Graphics2D)img.getGraphics();
}
public void playGame(){
this.draw();
}
public void draw(){
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, main.WIDTH, main.HEIGHT);
g2.setColor(Color.BLACK);
g2.fillOval(20, 20, 20, 30);
}
public void paintComponent(Graphics g){
g.drawImage(img, 0,0,null);
}
}