How to get title of cuurently active window(parent and child) in java

Question

I am developing a passPro application in this i want to need a title of currently active window like Adobe reader, Ms word,excel,access etc. The all the application having password protection when i have clicked on a particular application the "Enter the password" like child window gets opened. I want to that child window title. I am developing appliaction that automatically detects passwords from my access db when i opened any password protected file application(like access,word,pdf or PPT).