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javarandomaccessfile

Read an array of ints at once from RandomAccessFile

I am trying to read an array of ints from a RandomAccessFile. RandomAccessFile however only supports reading for an array of bytes. My code so far:

public long getSumOfElementsFromArray(long start, int length)
{
    int[] tempArray = new int[length];
    try
    {
        RAF.seek(start);
        RAF.readFully( (byte[]) (tempArray) , 0, length*4);
        //do some stuff with tempArray
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }
    return 0;
}

Eclipse tells me: "Cannot cast from int[] to byte[]". In C I could easily cast int* to char* but I do not know how this is done in Java. How could I do this in Java?

Solution

  • You can use ByteBuffer. Read as a byteArray and then convert.

    int[] tempArray = ByteBuffer.wrap(byteArray).asIntBuffer().array();

    Check similar question.