Java tutorial
import java.io.ByteArrayInputStream; import java.io.InputStream; import java.io.PushbackInputStream; public class Main { public static void main(String[] args) { byte[] arrByte = new byte[1024]; byte[] byteArray = new byte[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' }; InputStream is = new ByteArrayInputStream(byteArray); PushbackInputStream pis = new PushbackInputStream(is, 10); try { // read from the buffer one character at a time for (int i = 0; i < byteArray.length; i++) { // read a char into our array arrByte[i] = (byte) pis.read(); System.out.println((char) arrByte[i]); } // unread a char pis.unread('F'); // read again from the buffer arrByte[1] = (byte) pis.read(); System.out.println((char) arrByte[1]); } catch (Exception ex) { ex.printStackTrace(); } } }