SwingTest.java

package pl.selvin.test;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.DisplayMode;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

final public class SwingTest {

    public static void main(String... args) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice[] gs = ge.getScreenDevices();

        for (int i = 0; i < gs.length; i++) {
            DisplayMode dm = gs[i].getDisplayMode();

            int refreshRate = dm.getRefreshRate();
            if (refreshRate == DisplayMode.REFRESH_RATE_UNKNOWN) {
                System.out.println("Unknown rate");
            }
            System.out.println("Rate: " + refreshRate);
            int bitDepth = dm.getBitDepth();
            int numColors = (int) Math.pow(2, bitDepth);
        }
        EventQueue.invokeLater(() -> {
            JFrame frame = new JFrame("Test");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.getContentPane().add(BorderLayout.CENTER, new DrawPanel(frame));
            frame.setSize(300, 300);
            frame.setLocationByPlatform(true);
            frame.setVisible(true);
        });
    }

    static class DrawPanel extends JPanel {

        private static final long serialVersionUID = 1L;
        private final JFrame frame;
        private final int delay = 5;
        private final boolean SWING_TIMER = true;
        private final java.util.Timer utilTimer = new java.util.Timer();
        private int oneX = 7;
        private int oneY = 7;
        private boolean up = false;
        private boolean down = true;
        private boolean left = false;
        private boolean right = true;
        private final javax.swing.Timer swingTimer = new Timer(delay, actionEvent -> moveIt());
        private double oldTime;

        public DrawPanel(JFrame frame) {
            this.frame = frame;
            if (SWING_TIMER) {
                swingTimer.start();
            } else {
                utilTimer.scheduleAtFixedRate(new java.util.TimerTask() {
                    @Override
                    public void run() {
                        moveIt();
                    }
                }, delay, delay);
            }
            oldTime = System.nanoTime();
        }

        double getFps() {
            double newTime = System.nanoTime();
            double delta = newTime - oldTime;
            double fps = 1000000000 / (delta);
            oldTime = newTime;
            return fps;
        }

        public void paintComponent(Graphics g) {
            g.setColor(Color.BLUE);
            g.fillRect(0, 0, this.getWidth(), this.getHeight());
            g.setColor(Color.RED);
            g.fillRect(3, 3, this.getWidth() - 6, this.getHeight() - 6);
            g.setColor(Color.WHITE);
            g.fillRect(6, 6, this.getWidth() - 12, this.getHeight() - 12);
            g.setColor(Color.BLACK);
            g.fillRect(oneX, oneY, 6, 6);
            frame.setTitle(String.format("FPS: %.2f", getFps()));
        }

        private void moveIt() {

            if (oneX > getWidth() - 13) {
                right = false;
                left = true;
            }
            if (oneX < 7) {
                right = true;
                left = false;
            }
            if (oneY > getHeight() - 13) {
                up = true;
                down = false;
            }
            if (oneY < 7) {
                up = false;
                down = true;
            }
            if (up) oneY--;
            if (down) oneY++;
            if (left) oneX--;
            if (right) oneX++;
            repaint();
        }
    }
}