Java Tutorial - core java

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all most 30000 devices using java
this application covers all core java topics includes

intruduction,acces modifiers,io statemnts
conditional and control statements
arrays
object oriented programming covers
overloading and constructors,inheritance,polymorphisam,interfaces,abstract classes
packages - covers how to create package and how to use
exception handling - explained detailed with examples
strings and string buffer - it is string handling concept
multi threading - more than one task can run simultaniously
file i/o - all streaming classes explained with examples
serialization - object storage concept explained
java.lang pacakage - some mislanious concepts are covered
generics - creates our own types
util package - covers all datastructures concepts and collection framework covered
others - calendar class,random class covered