Java tutorial
import java.io.ByteArrayOutputStream; import java.io.DataOutputStream; import java.io.IOException; public class Main { public static void main(String[] args) throws IOException { String s = "Hello from java2s.com!"; ByteArrayOutputStream baos = new ByteArrayOutputStream(); DataOutputStream dos = new DataOutputStream(baos); dos.writeBytes(s); dos.flush(); System.out.println(s + " in bytes:"); for (byte b : baos.toByteArray()) { System.out.print(b + ","); } } }