import java.io.*;class PromptAndEcho{ public static void main(String args[])  throws IOException{   if(args.length()<1){    System.err.println("java Prompt And Echo <output file>");    return;}        BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));    PrintWriter pw=new PrintWriter(new FileOutputStream(args[0]));    while(true){     System.out.print("input>");     String s=stdin.readLine();     if(s.equalsLgnoreCase("exit"))     break;     System.out.println(s);     pw.println(s);}     pw.close();     stdin.close();    }  }  

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