Evaluating expressions 
When the VM suspends a thread (due to hitting a breakpoint or stepping through 
  code), you can evaluate expressions in the context of a stack frame. 
  -  Select the stack frame in which an evaluation is to be performed. The evaluation context will be the currently selected variable in the view. If no variable 
    is selected, the selected stack frame will be the context. 
-  Expressions can be entered and evaluated in the following areas:
    
  
-  Select the expression to be evaluated and select Display, Inspect or Execute from the context pop-up 
    menu. The result of a Display or Inspect evaluation 
    is shown in a popup window. Note that Execute does not display 
    a result - the expression is just executed.
- The result popup window can be dismissed by clicking outside of the popup 
    window or by pressing Esc. The result can be persisted to 
    the Debug Shell view (if Display was chosen) or Expressions view 
    (if Inspect was chosen) by pressing the key sequence shown 
    at the bottom of the popup window. For example, to move the result of an Inspect evaluation to the Expressions view press Ctrl-Shift-I. 
    Note that when the Display action is used from the Display 
    view the result is written to the Debug Shell view rather than a popup
Note: Evaluations cannot be performed in threads that have been manually suspended.
  Debugger
  Java editor
  Suspending threads
  Resuming the execution of suspended threads
  Detail Pane
  Debug Shell view
  Expressions view
  Variables view