continuously watch variables in eclipse even if it's not in scope

Question

Say, I have a recursive code as below, where the variable 'resultshere' keeps getting updated in every recursive call. I would like to see the value of this variable from the "previous" call even for the brief period when it's not in current scope, and so does not have a value (yet).

How can I do this in eclipse?

Say my code is something like this:

public class Test {

    public static void main(String[] args) {
        System.out.println(fun(5));
    }

    static int fun(int n) {
        int resultshere = 0;
        int ret = 0;

        if (n == 0) {
            resultshere = 1;
            return resultshere;
        }

        ret = fun(n - 1);
        resultshere = n * ret;

        return resultshere;
    }

}

Refer this link abhijitjana.net/2010/10/20/…

Roger
– Roger

2015-08-08 08:06:25 +00:00
Commented Aug 8, 2015 at 8:06 — Roger
– Roger, Commented Aug 8, 2015 at 8:06

Seelenvirtuose · Accepted Answer · 2015-08-08 08:09:45Z

2

When debugging in Eclipse you always see the stacktrace. The stacktrace shows the methods that are called one after another. For recursive calls, you will see the same method being called:

Here you see three calls to the fun method. The third call is highlighted, and you see the parameter n being at value 3 (in the variables view).

If you are now interested in the previous calls, simply select the method call you wish:

Here you see the first method call selected, and now you see all the variables (and parameters) - that this method call had - in the variables view.

answered Aug 8, 2015 at 8:09

Seelenvirtuose

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2 Comments

tubby Over a year ago

thank you, this is fantastic, never knew that you could see variables in the previous frame by just clicking on it. I have two questions though. 1.When the call at say n==0 returns some value to the previous call(frame), it's pushed out of the call stack and I can no more see it in the debug view you mentioned. Is it possible to still see these even after return? 2.My debug view is cluttered with calls from my previous debugs maybe, how can I clear these?

Seelenvirtuose Over a year ago

If a method call returns, it also disappears from the debug view because it simply does not allocate the stack anymore. This also means that you cannot access the local variables anymore because they simply disappeared, too.

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