import javax.sound.sampled.*;
import java.io.ByteArrayInputStream;
import java.io.File;

public class ArrayToWavHelper {
    private static int sampleRate = 22050;
    public static void main(String[] args) throws Exception {
        final AudioFormat frmt = new AudioFormat(sampleRate, 8, 1, true, true);
        try {
            SourceDataLine line = AudioSystem.getSourceDataLine(frmt);
            line.open(frmt);
            line.start();

            //Frequency = ... Hz for ... seconds
            byte[] bytes = generateSineWavefreq(50, 5);

            AudioInputStream ais = new AudioInputStream(new ByteArrayInputStream(bytes), frmt, bytes.length);
            AudioSystem.write(ais, AudioFileFormat.Type.WAVE, new File("test.wav"));

            play(line, bytes);
            line.drain();
            line.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static byte[] generateSineWavefreq(int frequencyOfSignal, int seconds) {
        // total samples = (duration in second) * (samples per second)
        byte[] sin = new byte[seconds * sampleRate];
        double samplingInterval = (double) (sampleRate / frequencyOfSignal);
        System.out.println("Sampling Frequency  : " + sampleRate);
        System.out.println("Frequency of Signal : " + frequencyOfSignal);
        System.out.println("Sampling Interval   : " + samplingInterval);
        for (int i = 0; i < sin.length; i++) {
            double angle = (2.0 * Math.PI * i) / samplingInterval;
            sin[i] = (byte) (Math.sin(angle) * 127);
            System.out.println("" + sin[i]);
        }
        return sin;
    }

    private static void play(SourceDataLine line, byte[] array) {
        int length = sampleRate * array.length / 1000;
        line.write(array, 0, array.length);
    }
}