Data update

Task/Metronome/Java/metronome-2.java

@@ -0,0 +1,113 @@
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.io.IOException;
+import java.net.URL;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.Clip;
+import javax.sound.sampled.LineUnavailableException;
+import javax.sound.sampled.UnsupportedAudioFileException;
+import javax.swing.ImageIcon;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+public final class MetronomeTask {
+
+	public static void main(String[] aArgs) {
+		EventQueue.invokeLater( () -> { new Metronome(60, 4, 1).start(); } );
+	}	
+
+}
+
+final class Metronome extends JPanel {
+	
+	public Metronome(int aBeatsPerMinute, int aMeasure, int aDurationInMinutes) {
+		beatsPerMinute = aBeatsPerMinute; measure = aMeasure; durationInMinutes = aDurationInMinutes;
+		SoundEffect.initialise();
+		createAndShowGUI();
+	}
+	
+	public void start() {
+		executorService = Executors.newSingleThreadScheduledExecutor();
+		executorService.scheduleAtFixedRate(provideService, 1, 1, TimeUnit.SECONDS);	
+	}	
+	
+	private void createAndShowGUI() {
+		JFrame.setDefaultLookAndFeelDecorated(true);
+        frame = new JFrame("Metronome");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setIconImage( new ImageIcon("./metronomeJava.png").getImage() );
+        frame.add(createPanel());
+        frame.pack();
+		frame.setLocationRelativeTo(null);
+		frame.setResizable(false);
+        frame.setVisible(true);
+	}
+	
+	private JPanel createPanel() {
+		setPreferredSize( new Dimension(800, 600) );
+        setBackground(Color.CYAN);
+        return this;
+	}	
+	
+	private JFrame frame;
+	private ScheduledExecutorService executorService;
+	private int beatsPerMinute, measure, durationInMinutes, counter;	
+	
+	private Runnable provideService = () -> {	
+		if ( counter < durationInMinutes * beatsPerMinute ) {
+			counter++;
+			if ( counter % measure != 0 ) {
+				SoundEffect.Tick.play();
+				if ( getBackground() != Color.PINK ) {
+					setBackground(Color.PINK);
+				} else {
+					setBackground(Color.CYAN);
+				}
+			} else {
+				SoundEffect.Tock.play();
+				setBackground(Color.ORANGE);
+			}
+		} else {
+			executorService.shutdown();
+			frame.dispose();
+			Runtime.getRuntime().exit(0);
+		}
+	};
+	
+}
+
+enum SoundEffect {
+	
+    Tick("./metronomeTickJava.wav"), Tock("./metronomeTockJava.wav");
+	
+    public static void initialise() {
+    	values();
+    }
+
+    public void play() {
+    	if ( clip.isRunning() ) {
+    		clip.stop();
+    	}
+			clip.setFramePosition(0);
+			clip.start();
+    }
+
+    private SoundEffect(String soundFileName) {
+    	URL url = getClass().getClassLoader().getResource(soundFileName);
+        try ( AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(url) ) {
+            clip = AudioSystem.getClip();
+            clip.open(audioInputStream);
+        } catch (IOException | LineUnavailableException | UnsupportedAudioFileException ex) {
+            ex.printStackTrace();
+        }
+    }
+
+    private Clip clip;
+
+}