即興で作ってみた
TelnetClientモドキ

import java.net.*;import java.io.*;public class T extends Thread{InputStream i;
OutputStream o;public T(InputStream I,OutputStream O){i=I;o=O;}public void run(
){try{int c;while(-1!=(c=i.read()))o.write(c);o.close();System.exit(0);}catch(
Exception e){}}public static void main(String[] a){try{Socket s=new Socket(a[0]
,Integer.parseInt(a[1]));new T(s.getInputStream(),System.out).start();new T(
System.in,s.getOutputStream()).start();}catch(Exception e){System.out.println(
"Usage: java T HOST PORT\r\nヽ(`Д´)ﾉ　もがしゃっ！");}}}