This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
"Plz" is not a real word. Please be sure to use only real words such as "please" when posting to the JavaRanch.
And here are a few more tips to help you get the most out of JavaRanch as a resource:
1) Please modify your display name to be mixed case. The all-uppercase name is rather jarring and could be considered rude (shouting) by some. Our eyes will thank you.
2) Using a descriptive title helps direct the attention of those familiar with the area of your issue. "Plz clear my doubt" tells us nothing about the nature of your question. Please read this for more information.
3) Aside from telling us that you are having trouble compiling, your post is very light on details. It'd be more effective to include information such as how and what you've tried already. Please include more detail in your posts so that others know how to help you better.