New to Java - why won't my program run ?

Hi
I am new to Java - this compiles but does not run - any suggestions please ?
class ThinkofANumberApp extends basic{
     public static void main (String param[]) throws Exception
     input source = new input ();
     output sink = new output ();
     int result = source.readint();
     //list number questions for numbers
          sink.writeln("Think of a number");
          source.readln();
          sink.writeln("Multiply it by 5");
          source.readln();
          sink.writeln("Add 6");
          source.readln();
          sink.writeln("Multiply it by 4");
          source.readln();
          sink.writeln("Add 9");
          source.readln();
          sink.writeln("Multiply it by 5");
          source.readln();
          sink.writeln("Type the final result");
          sink.write("My \"guess\" is that your"
          + " original number was ");
          sink.writeln((result-165)/100);
Thanks in advance.
Nadjie

What is "input" and "output" and have you included these classes in your classpath?

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