Java number / byte arary convert

NumberBytesUtils.java

import java.util.Arrays;

/**
 * int 형과 byte[] 간의 변환.
 * ByteBuffer 를 사용하는 방법 대신, bit operator를 사용하는 기법.
 *
 * Java는 기본적으로 BigEndian이다.
 *
 * 참조
 *   - http://stackoverflow.com/questions/2383265/convert-4-bytes-to-int
 *   - http://nuridol.egloos.com/1629750 : ByteBuffer
 */
public class NumberBytesUtils {
    public static void main(String[] args) {


        int num = 2892;

        byte[] bytes = intToBytes(num);
        System.out.println(num + " to bytes " + Arrays.toString(bytes));
        System.out.println("to num again : " + bytesToInt(bytes));
    }

    public static byte[] intToBytes(int value) {
        return new byte[]{
                (byte) (value >>> 24),
                (byte) (value >>> 16),
                (byte) (value >>> 8),
                (byte) (value)
        };
    }

    public static int bytesToInt(byte[] bytes) {
        int value = ((int)bytes[0] & 0xFF) << 24;
        value += ((int)bytes[1] & 0xFF) << 16;
        value += ((int)bytes[2] & 0xFF) << 8;
        value += (int)bytes[3] & 0xFF;

        return value;
    }
}

NumberBytesUtilsTest.java

@Test
public void intToBytes() {
	assertIntBytesConvert(0);
	assertIntBytesConvert(1);
	assertIntBytesConvert(-1);
	assertIntBytesConvert(500);
	assertIntBytesConvert(-500);
	assertIntBytesConvert(Integer.MAX_VALUE);
	assertIntBytesConvert(Integer.MIN_VALUE);

}

private void assertIntBytesConvert(final int value) {
	byte[] bytes = intToBytes(value);

	log.debug("int {} to bytes : {}", value, bytes);
	assertThat(bytes).hasSize(4); // 32bit

	assertThat(bytesToInt(bytes)).isEqualTo(value);
}