This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I am new to java and am doing self study using Lawrenceville press Guide to Java. In this last exercise I am working on, the classes compile fine but I am getting a nullpointer error referencing the lines - "while (current.getNext() != null)" - and - "anObject.enqueue((String)entry);". I am having trouble getting around it. I have tried to handling the exceptions using throws, catch etc. but I am not setting the code up right or something in order to get the program to accept the input. What can I do to get the program to accept the user input? thank you.
You set current to a new node, then to head, which is null:One or both of those statements are wrong... even if head is the correct value, why set current to something only to throw it away on the next line?
Joined: Jan 19, 2010
Thank you. I am not sure why I did that. Followng too close to examples in the book I guess. I removed the line and now it works great. Thank you again.