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JDK 4, 5, 6, 7, 8, 9 version features


                     Different Java version features (jdk 1.4 to 1.9)

Java 4
Assertion , NIO

Java 5 
For-each loop, Varargs, Static Import, Autoboxing and Unboxing, Enum, Covariant Return Type, Annotation, Generics

Java 6
New collection interfaces includes Deque, NavigableSet, NavigableMap, JAXP, jdbc enhancement (driver auto loading, support for row id sql type, annotation based sql query)  

Java 7
Type inference, String in switch, try with resource, fork join framework, underscore in numeric literals, multiple exception in single catch block, java nio package, more precise re throw of exception

Java 8 
Lambda expressions,Functional interfaces,Functional Programming,Method references,Default methods,Stream API,Optional

Java 9 (March- 2017 launch)
Java Module System, JShell


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import oracle.sql.CLOB;


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In Theory basically thread which is light weight process.Thread shares mostly same memory space.
I said mostly because there is some space called thread local which is not common to threads & separate for each thread. We create thread whenever we wanted to use multicore of processor although that doesn't mean single core cant use it. In single core context switching works among different running thread.

for example suppose there is website which is showing latest price as well as offer as well as doing order booking all these things can be assigned to different thread to provide parallel processing.

There are 2 ways for creating a thread.

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