Method toArray

output/java_guava/1.4.17/Doubles.java:424–436

Returns an array containing each value of collection, converted to a double value in the manner of Number#doubleValue. Elements are copied from the argument collection as if by collection.toArray(). Calling this method is as thread-safe as calling that method. @p

(Collection<? extends Number> collection)

  public static double[] toArray(Collection<? extends Number> collection) {
    if (collection instanceof DoubleArrayAsList) {
      return ((DoubleArrayAsList) collection).toDoubleArray();
    }
    Object[] boxedArray = collection.toArray();
    int len = boxedArray.length;
    double[] array = new double[len];
    for (int i = 0; i < len; i++) {
      // checkNotNull for GWT (do not optimize)
      array[i] = ((Number) checkNotNull(boxedArray[i])).doubleValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to