Simulator.java

import javax.swing.*;
import java.awt.*;
import javax.swing.JPanel;


public class Simulator extends JFrame {

private final static int dimH = 1000;
private final static int dimV = 500;
private final static int startx = 10;
private final static int starty = 10;
private final static String title = "Test";
public javax.swing.JPanel jpanel1;
public JFrame frame = new JFrame();

    public Simulator() {
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        initcomponents();
    }

    public static void main (String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Simulator();
            }
        });
    }

// <editor-fold defaultstate="collapsed" desc="COMPONENTS INIT">
    public void initcomponents() {
        //JFrame frame = new JFrame();
        frame.setSize(dimH, dimV);
        frame.setTitle(title);
        frame.setResizable(false);
        Container pane = frame.getContentPane();
        /*frame.add( new JPanel() {
            public void paintComponent( Graphics g ) {
                super.paintComponent(g);
                Graphics2D g2 = (Graphics2D)g;
                Line2D line = new Line2D.Double(10, 10, 40, 40);
                g2.setColor(Color.blue);
                g2.setStroke(new BasicStroke(10));
                g2.draw(line);
            }
        });*/
        Dimension appletSize = frame.getSize();
        int appletHeight = appletSize.height;
        int appletWidth = appletSize.width;
        // AVALIAR RESOLUÇÃO DO ECRÃ
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
//        System.out.println(screenSize.width);
//        System.out.println(screenSize.height);
        // AVALIAR TAMANHO DA APPLET
//        System.out.println("This applet is " + appletHeight + " pixels high by " +
//                     appletWidth + " pixels wide.");
        // DESENHAR FUNDO
        Desenho d = new Desenho(startx,starty,appletWidth - 25,appletHeight - 80,Color.blue);
        pane.add(d, "Center");
        pane.add(new Botoes(), "East");
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible( true );
        frame.setLocationRelativeTo(null);
        pack();
    }// </editor-fold>

// <editor-fold defaultstate="collapsed" desc="CLASS DESENHO">
    public class Desenho  extends JPanel {
        int cx,cy,comp,larg;
        Color cor;

        public Desenho (int cx, int cy, int comp, int larg, Color cor) {
            this.cx = cx;
            this.cy = cy;
            this.comp = comp;
            this.larg = larg;
            this.cor = cor;
        }
         //      frame.add( new JPanel() {
            public void paintComponent( Graphics g ) {
                super.paintComponent(g);
                /*Graphics2D g2 = (Graphics2D)g;
                Line2D line = new Line2D.Double(10, 10, 40, 40);
                g2.setColor(Color.blue);
                g2.setStroke(new BasicStroke(10));
                g2.draw(line);*/
                g.setColor(cor);
                g.fillRect(cx,cy,comp,larg);
            }
        //});
    }// </editor-fold>

    public class Botoes extends JPanel {
        public Botoes () {
            System.out.println("Botoes");
            JButton start = new JButton("Start");
            this.add(start);
            JButton sair = new JButton("Exit");
            this.add(sair);
        }
    }

}