我需要在Java中尽快将long[]转换为long[][]. 如果long[]无法完全对应long[],则我会将空行附加到long[].
当前代码如下:
有没有什么方法可以使这更有效率?例如,有没有办法避免内存复制?
当前代码如下:
private long[][] convertOneDimensionalToTwoDimensional(int numberOfRows, int rowSize, long[] srcMatrix) {
int srcMatrixLength = srcMatrix.length;
int srcPosition = 0;
long[][] returnMatrix = new long[numberOfRows][];
for (int i = 0; i < numberOfRows; i++) {
long[] row = new long[rowSize];
int nextSrcPosition = srcPosition + rowSize;
if (srcMatrixLength >= nextSrcPosition) {
// Copy the data from the file if it has been written before. Otherwise we just keep row empty.
System.arraycopy(srcMatrix, srcPosition, row, 0, rowSize);
}
returnMatrix[i] = row;
srcPosition = nextSrcPosition;
}
return returnMatrix;
}
有没有什么方法可以使这更有效率?例如,有没有办法避免内存复制?