haii i want to ask me for expert systems use a java program, now the problem is 1) the question does not appear in the text area??
2nd) appears java.lang.NullPointerException?? What was the meaning of his comrades huh?? ,,
please enlighten gan thank youAttachment 3036
Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.
Please give your threads better titles that correspond the question or problem being addressed.
We can't help much with your first question without seeing the code. You can find the meaning of NullPointerException using your favorite search engine, and we can't help you solve that without seeing the whole error message and the code that caused it.
Also java.lang.NullPointerException is a java class that can be looked up in the java API doc.
Java Platform SE 7