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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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