Where is the default app source code remains in Android 2.2 source code?

Question

I have downloaded the Source code of Android 2.2 . Where can I find the default app source code of Android (Calculator, Calendar, etc, on pressing Home Button)

Answer 1

I found Calculator,Calender and some other android app source code in this page: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/2.3_r1/com/android/calculator2/Calculator.java/