Question

我正在尝试运行一个使用线程在自身上产生正弦波的对象。当我尝试用线程互相播放对象时，它会播放第一个线程，直到它完成然后播放第二个线程。我无法弄清楚这个线程有什么问题，因为我不熟悉java中的线程。感谢您的帮助和回复！

以下是代码：

package dreamBeats;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;

public class Tone extends Thread{

    static int length;
    static int wavelength;

   protected static final int SAMPLE_RATE = 16 * 1024;

public Tone(int time, int wave) throws LineUnavailableException{
       final AudioFormat af = new AudioFormat(SAMPLE_RATE, 8, 1, true, true);
       SourceDataLine line = AudioSystem.getSourceDataLine(af);
       line.open(af, SAMPLE_RATE);
       line.start();

       for(double freq = wave; freq <= wave*2; freq += freq/4)  {
           byte [] toneBuffer = createSinWaveBuffer(freq, time);
           int count = line.write(toneBuffer, 0, toneBuffer.length);
       }

       line.drain();
       line.close();

       length = time;
       wavelength = wave;
   }

//makes a sine wave buffer
   public static byte[] createSinWaveBuffer(double freq, int ms) {
       int samples = (int)((ms * SAMPLE_RATE) / 1000);
       byte[] output = new byte[samples];
           //
       double period = (double)SAMPLE_RATE / freq;
       for (int i = 0; i < output.length; i++) {
           double angle = 2.0 * Math.PI * i / period;
           output[i] = (byte)(Math.sin(angle) * 127f);  }

       return output;
   }
// run the tone object
   public void run(){

        try {

        Tone(length, wavelength);

        } catch (LineUnavailableException e) {}
      }
//create the threads and run them during one another
   public static void main(String[] args) throws LineUnavailableException, InterruptedException {
       Thread t1 = new Thread (new Tone(1000, 200));
       Thread t2 = new Thread (new Tone(1000, 500));
       t1.start();
       t2.start();
    }



}

Answer 1

线程很棘手，并且总是不可能在运行期间判断哪个线程具有优先级，因为它依赖于JVM。运行线程t1和t2的方式，不能保证t1将始终在t2之前执行，反之亦然。我建议使用wait和notify来管理线程执行。

用线程一次运行两个对象？

1 个答案: