import java.nio.*;
import java.nio.ByteBuffer;
public class PutAtIndex {
	public static final int capacity = 9;
	public static void main(String[] args) {
		try {
			ByteBuffer byteBuf = ByteBuffer.allocate(capacity);
			int i = 3;
			System.out.println("Write value at index " + i);
			byteBuf.putChar(i, 'B');
			byteBuf.rewind();
			System.out.print("\nRead value from index " + i + " : ");
			while (byteBuf.hasRemaining()) {
				System.out.print((char) byteBuf.get());
			}
		} catch (Exception e) {
			System.out.println(e);
		}
	}
}