java中多个byte[]组合成一个有什么好办法

Question

需要将多个不通长度的byte[]按顺序合并成一个，请问有什么效率较高的好办法？

Answer 1

可以循环遍历byte[]通过System.arraycopy实现，如：

private static byte[] byteMerger(byte[]... byteList) {
    int lengthByte = 0;
        for (int i = 0; i < byteList.length; i++) {
            lengthByte += byteList[i].length;
        }
        byte[] allByte = new byte[lengthByte];
        int countLength = 0;
        for (int i = 0; i < byteList.length; i++) {
            byte[] b = byteList[i];
            System.arraycopy(b, 0, allByte, countLength, b.length);
            countLength += b.length;
        }
        return allByte;
    }