Null Pointer Exception String null [closed]

Question

if( currentTimeslot.isEmpty()){
         System.out.println("Do stuff");
            }

How come I get a NullPointerException? How do I check whether a string is NULL and do stuff if it is? Whenever currentTimeslot is equals to NULL I get the error. Here is the console message:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at PM.ui.MainFrame.getJPanelTopMenu(MainFrame.java:382)

Answer 1

Try the following

    if( currentTimeslot == null){
             System.out.println("Do stuff");
   }