title: Why when I run wathever program in NetBeans, the part of system.out.println() affears as class unidentified
body: <p>I just installed Netbeans and I wanted to write a small program that can read a value and then show it on screen. The thing is that whenever I add the sentence <em>System.out.println()</em> it marks an error and it says that the class is unidentified. I've tried to solve looking for it's library but I got no clue. Would you mind giving me a hand</p>