ArrayWrappingByteBufferTest.java

import java.nio.ByteBuffer;
import java.util.Arrays;
import static java.util.concurrent.ThreadLocalRandom.current;

public class ArrayWrappingByteBufferTest {

    public static void main(final String[] args) {

        final byte[] array = new byte[] {1, 1, 1, 1, 1, 1, 1, 1};
	System.out.println("array: " + Arrays.toString(array));

        final int offset = 1;
        final int length = 6;
        final ByteBuffer buffer = ByteBuffer.wrap(array, offset, length);
	assert buffer.capacity() == array.length;
	assert buffer.position() == offset;
	assert buffer.limit() == offset + length;

        // change the value before offset
	buffer.position(0);
	buffer.put((byte) 0);
	System.out.println("array: " + Arrays.toString(array));

        // change the value after offset + length
	buffer.limit(8);
	buffer.position(7);
	buffer.put((byte) 0);
	System.out.println("array: " + Arrays.toString(array));
    }
}