There are many new features that have been added in java. There are major enhancement made in Java5, Java6 and Java7 like auto-boxing, generics, var-args, java annotations, enum, premain method etc.
Most of the interviewers ask questions from this chapter.
J2SE 4 Features- Assertion (Java 4)
- For-each loop (Java 5)
- Varargs (Java 5)
- Static Import (Java 5)
- Autoboxing and Unboxing (Java 5)
- Enum (Java 5)
- Covariant Return Type (Java 5)
- Annotation (Java 5)
- Generics (Java 5)
- Instrumentation (premain method) (Java 6)
- Binary Literals (Java 7)
- Underscores in Numeric Literals (Java 7)
The important feature of J2SE 4 is assertions. It is used for testing.
The important features of J2SE 5 are generics and assertions. Others are auto-boxing, enum, var-args, static import, for-each loop (enhanced for loop) etc.
The important feature of JavaSE 6 is premain method (also known as instrumentation).
The important features of JavaSE 7 are try with resource, catching multiple exceptions etc.
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