在Eclipse中调试时更改已编译的代码

Question

It may sound stupid but: is it possible to tell Eclipse to change some already compiled code (in a .class file) while debugging?

I would like to check a couple of things for some values. I know that if it is compiled I cannot change it, so it makes no sense to try this. Well, in this concrete case it does make sense.

I am also aware of the hot code replace functionality of Eclipse but it doesn't work for me because it is for source files.

EDIT: In my case I don't want to change the value of a variable. I would like to put a 1 instead of a 0 in this call within a .class file

getTabFolder().setSelection(0);

Answer 1

If it is just a variable value you want to change you can do this.

When you are debugging in the debug view of eclipse there is a variables window. If you right click on the variable you wish to change and press 'Change Value' a window will pop up and you can change the value of that variable in there.

Answer 2

I think that you can change body of existing methods, but you cannot add new methods.

You can also change variable values.

Answer 3

It depends, if you are running the code locally Eclipse supports hot swapping.

You can find some info here .

If you change the code While debugging, eclipse will automatically transfer it to the target VM