将OutputStream转换为String的Java程序

import java.io.*;

public class OSString {

 public static void main(String[] args) throws IOException {

   ByteArrayOutputStream s = new ByteArrayOutputStream();

   String l = "Hello java!";

   s.write(l.getBytes());

   String lastString = new String(s.toByteArray());

   System.out.println(lastString);

 }

}