AutoIT.txt

AutoIT Editor 

->ControlFocus("Open","","Edit1");  This method takes 3 arguments "Title","","Class+Instance"
->ControlSetText("Open","","Edit1","E:\exam form\photo n sign\declaration.jpg");  This method takes 4 arguments "Title","","Class+Instance",File path to be uploaded
->ControlClick("Open","","Button1"); This method takes 3 arguments "Title","","Class+Instance"

AutoIT Window Info
-> In this there is a finderTool with the help of that we get arguments for above 3 methods.

Save this file 
Compile it
Convert it into .exe file format

Now in .java file , we will have to give this .exe files path with the help of following command

Runtime.getRuntime().exec("file path to .exe file")