Java Command Window Matlab Alike

Question

In Matlab, whenever I enter a variable name into command window, it displays the value of that variable so far, very useful feature. So that, I tried to add the same feature in java. That is, I want to display the value of any kind of variable(int, double, value of array such as signal[4] ) when the user enters something. If entered variable does not exist, it gives error or blows up. More precisely, I want to add something similar to the code below at the end of my project.

while(true){
        Scanner scan = new Scanner(System.in);
        System.out.println("Yep? : ");
        String s = scan.nextLine();
        System.out.println(s + " = value of that entered variable");
        }

Obviously, It is not as easy as it sounds but that is the reason I am asking in here. Is there any easy way to add this simplicity?

score 0 · Answer 1 · edited May 23 '17 at 11:59

No. For java, this is pretty meaningless, since the

The scope is the one of your loop
it could be at best applied to the names of fields via the reflection API
but for local variables, the name is lost during compilation (if the compiler likes to optimize, it could remove the variable completely).

I could imagine that upon binding a reasonably chosen set of objects into an Java Expression Language (http://docs.oracle.com/javaee/6/tutorial/doc/bnahq.html) - using a variable mapper (see JSTL/JSP EL (Expression Language) in a non JSP (standalone) context) you could achieve something what you in a simple way.

Java Command Window Matlab Alike

1 Answers1