[英]What is the best way to combine several arrays into one single array
Hey, I was trying to combine several arrays of type double into one single array, what is the best way to do it? 嗨,我正在尝试将多个double类型的数组合并为一个数组,什么是最好的方法? Thanks! 谢谢!
System.arraycopy
to copy one source array at a time into the target array, updating the place where you copy it to on each iteration. 重复调用System.arraycopy
将一个源数组复制到目标数组中,从而在每次迭代时更新复制它的位置。 So something like: 所以像这样:
public static double[] Combine(double[][] arrays)
{
int totalLength = 0;
for (double[] source : arrays)
{
totalLength += source.length;
}
double[] ret = new double[totalLength];
int index = 0;
for (double[] source : arrays)
{
System.arraycopy(source, 0, ret, index, source.length);
index += source.length;
}
return ret;
}
您可以从Guava库使用此方法,该库是开源的,并且可能在本月晚些时候发布实际的二进制版本: Doubles.concat(double [] ...)
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