Question

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byte array to Int Array

I have a large array of bytes, can I somehow interpret it as an array of ints, such that each entry is just four of the original bytes?

I mean something like this:

for (int i = 0; i < byteArray.length; i += 4) {
    intArray[i / 4] = byteArray[i] << 24 + byteArray[i+1] << 16 + byteArray[i+2] << 8 + byteArray[i+3];
}

but rather than copying the whole array byte by byte which takes forever because the array is huge, just read ints off the array that already exists.

Answer 1

Using this code:

IntBuffer intarray = ByteBuffer.wrap(bytearray).order(ByteOrder.BIG_ENDIAN).asIntBuffer();
 intarray.get(100);

will take very few extra heap space. Actually, it wraps byte array and creates a int array view. Significantly faster, in my PC for buffer size of INT_MAX takes few nanoseconds.