range value of byte

		byte[] b = new byte[400];
		int j = 0;
		for (int i = -128; i < 128; i++){
			b[j] = i;
			System.out.println(j + " " + i);
			j++;

		}

Gia tri se lap lai mac du da toi 127, lap lai tu -128, cu tiep tuc nhu the', that. la....

vi tu 127, tang them 1 don vi se thanh -128. va vi the ma khong thoat khoi vog lap