Riassunti

Nella cartella src/sound andremo ad elencare i file di seguito, mentre nella cartella src/resources troveremo la musica in formato .wav.

Per quanto riguarda il file Main.java:

package sound;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
    public static void main(String[] args) {
        JFrame f = new JFrame("Sound");
        f.setSize(600,100);
        JPanel p = new JPanel();
        JButton start = new JButton("start");
        JButton stop = new JButton("stop");
        JButton restart = new JButton("restart");
        JButton loop = new JButton("loop");
        JButton incrementVolume = new JButton("+");
        JButton reduceVolume = new JButton("-");
        p.add(start); p.add(stop);
        p.add(restart); p.add(loop);
        p.add(incrementVolume);
        p.add(reduceVolume);
        f.add(p);
        Sound s = new Sound("test.wav");
        start.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                s.start();
            }
        });
        stop.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                s.stop();
            }
        });
        restart.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                s.restart();
            }
        });
        loop.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                s.loop();
            }
        });
        incrementVolume.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                s.incrementVolume();
            }
        });
        reduceVolume.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                s.reduceVolume();
            }
        });
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }
}

Per quanto riguarda il file Sound.java:

package sound;

import java.io.IOException;

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;

public class Sound {
    private AudioInputStream audioIn;
    private Clip clip;

    public Sound(String name) {
        try {
            audioIn = AudioSystem.getAudioInputStream(getClass().getResourceAsStream("/resources/" + name));
            clip = AudioSystem.getClip();
            clip.open(audioIn);
        } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
            clip = null;
            e.printStackTrace();
        }
    }

    public void loop() {
        if (clip != null) {
            clip.loop(Clip.LOOP_CONTINUOUSLY);
        }
    }

    public void start() {
        if (clip != null) {
            if (clip.getFramePosition() == clip.getFrameLength())
                clip.setFramePosition(0);
            clip.start();
        }
    }

    public void stop() {
        if (clip != null) {
            clip.stop();
        }
    }

    public void restart() {
        if (clip != null) {
            clip.stop();
            clip.setFramePosition(0);
            clip.start();
        }
    }

    public void reduceVolume() {
        if (clip != null) {
            FloatControl gainControl = (FloatControl) clip.getControl(FloatControl.Type.MASTER_GAIN);
            float value = gainControl.getValue();
            value -= 1.0f;
            if (value >= gainControl.getMinimum())
                gainControl.setValue(value);
        }
    }

    public void incrementVolume() {
        if (clip != null) {
            FloatControl gainControl = (FloatControl) clip.getControl(FloatControl.Type.MASTER_GAIN);
            float value = gainControl.getValue();
            value += 1.0f;
            if (value <= gainControl.getMaximum())
                gainControl.setValue(value);
        }
    }
}