2 difference between comparator and comparable arraylist and linked list hash map and hash table ducking exception implement threads which better can u start 2 threads 123 and new string 123 inheritance singleton class closing super of exception technology using synchronised strings stringbuffer stringbuilder method in object final class implementation Collection Sets in java

3 services- ways to start content provider broadcast receiver activity life cycle

4 Telephonic round Root layout for all layouts Application class activitycontext and applicationcontext difference one activity to another... states launch modes in android why framelayout is root what is root layout difference between frame layout n linear layout linear layout and relative layout difference communication between 2 fragments 3 rows 1 - 2 col 2 - 3 col 3 - 0 col implementation custom broadcast receiver tabular view grid layout and grid view