Java shift right outputting negative value

i'm really confused with, well it's best if I show my code first so here's what I got.

void dumpInt(int x) throws IOException {
    if ( true ) {
        //8388638
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        writer.writeByte(x&0xff);
        writer.writeByte((x>>8)&0xff);
        writer.writeByte((x >> 16) & 0xfff);
        writer.writeByte((x>>24)&0xff);
        outputStream.write(x & 0xff);
        outputStream.write((x >> 8) & 0xff);
        outputStream.write((x >> 16) & 0xff);
        outputStream.write((x >> 24) & 0xff);
        System.out.println((x >> 16) & 0xff);
        if(x == 8388638){
            String xz = "";
            byte[]array = outputStream.toByteArray();
            System.out.println(array[2]+" | " + (char)array[2]);
        }
    } else {
        writer.writeInt(x);
    }
}

this works fine but when I do dumpInt(8388638), I get some weird occurrences. writer.writeByte((x >> 16) & 0xfff) writes -128 to the writer Im clueless as why that is.

The same thing happens for outputStream.write((x >> 16) & 0xff); but when I run System.out.println((x >> 16) & 0xff); it outputs 128(positive)

Does anybody know why this is and how I can correct it? (Sorry i'm somewhat experienced in java but im not the best by any means so if this is a really simple fix my bad)

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