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我正在开发一个通过单击键盘键来播放声音的程序。我已经让它工作了，但是当我试图想象那个声音时，声音停止播放。所以我既可以播放声音，也可以制造波浪，但不能两者兼而有之。我如何让它们都工作？

    public class GuitarHeroVisualizer { 
     public static void main(String[] args) {
      String keyboard = "q2we4r5ty7u8i9op-[=zxdcfvgbnjmk,.;/' ";
      GuitarString[] strings = new GuitarString[37];
      int x = 0;
      for (int i = 0; i < 37; i++) {
        strings[i] = new GuitarString(440.0 * Math.pow(1.05956, i - 23));
      }
      while (true) {
        if (StdDraw.hasNextKeyTyped()) {
            char key = StdDraw.nextKeyTyped();
            int j = keyboard.indexOf(key);
            if (j != -1) {
                strings[j].pluck();
            }
        }
         // compute the superposition of samples
         //double sample = stringA.sample() + stringC.sample();
         double sample = 0;
         for (int i = 0; i < 37; i++) {
            sample += strings[i].sample();
         }

        // play the sample on standard audio

        if(sample != 0)
        {
            StdDraw.setXscale(0, 90);
            StdDraw.line(x, 0, x + 1, sample);
            StdDraw.line(x + 1, sample, x + 2, 0);
            x += 2;
        }

        StdAudio.play(sample);

        for (int i = 0; i < 37; i++) {
            strings[i].tic();
        }
    }
 }

}

其他两个类：

    public class GuitarString {
RingBuffer buffer;
int N;
int time = 0;
public GuitarString(double frequency) {
    N = (int)(44100/frequency);
    buffer = new RingBuffer(N);
    for (int i = 0; i < N; i++) {
        buffer.enqueue(0);
    }
}

public GuitarString(double[] init) {
    buffer = new RingBuffer(init.length + 1);
    N = init.length + 1;
    for (int i = 0; i < init.length; i++) {
        buffer.enqueue(init[i]);
    }
}

public void pluck() {
    for (int i = 0; i < N; i++) {
        buffer.dequeue();
    }
    for (int i = 0; i < N; i++) {
        buffer.enqueue(Math.random()-0.5);
    }
}

public void tic() {
    time++;
    double first = buffer.dequeue();
    double avg = (buffer.peek() + first) / 2;
    buffer.enqueue(avg * .994);
}

public double sample() {
    return buffer.peek();
}

public int time() {
    return time;
}

}

下一个：

    public class RingBuffer {
double[] nums;
int capacity;
int size = 0;
int first = 0;
int last = 0;
public RingBuffer(int cap) {
    capacity = cap;
    nums = new double[cap];
}

public int size() {
    return size;
}

public boolean isEmpty() {
    if (size() == 0) {
        return true;
    }
    return false;
}

public boolean isFull() {
    if (size() == capacity) {
        return true;
    }
    return false;
}

public void enqueue(double x) {
    if (isFull()) {
        throw new RuntimeException("Queue is full.");
    }
    nums[last] = x;
    last++;
    if(last == capacity) {last = 0;}
    size++;
}

public double dequeue() {
    if (isEmpty()) {
        throw new RuntimeException("Queue is empty.");
    }
    double num = nums[first];
    first++;
    if(first == capacity) {first = 0;}
    size--;
    return num;
}

public double peek() {
    return nums[first];
}

}

这是标准类： https ://introcs.cs.princeton.edu/java/stdlib/javadoc/StdDraw.html https://introcs.cs.princeton.edu/java/stdlib/javadoc/StdAudio.html

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