Different JDK Versions ?
Java 1.1
* Language changes:
inner classes
* Library changes:
AWT event changes
JDBC, RMI
reflection
Java 1.2
* Language changes:
the strictfp keyword
* Library changes:
a unified collections system
Swing as a new UI-System on top of AWT
* Platform changes
a real JIT, greatly improving speed
Java 1.3
Mostly minor improvements:
* Platform changes:
HotSpot JVM: improvement over the original JIT
Java 1.4
JSR 59
* Language changes:
the assert keyword
* Library changes:
regular expressions support
NIO
integrated XML handling
Java 5 (a.k.a 1.5)
JSR 176, features and enhancements
* Language Changes:
generics (that's the big one)
annotations
enum types
varargs, enhanced for loops (for-each)
* Library changes:
concurrency utilities in java.util.concurrent
Java 6 (a.k.a 1.6)
JSR 270. features and enhancements
Mostly incremental improvements to existing libraries, no new language features (except for the @Override snafu).
Java 7 (a.k.a 1.7)
JSR 336, features and enhancements
* Language changes:
Project Coin (small changes)
switch on Strings
try-with-resources
diamond operator
* Library changes:
new abstracted file-system API (NIO.2) (with support for virtual filesystems)
improved concurrency libraries
elliptic curve encryption
more incremental upgrades
* Platform changes:
support for dynamic languages
Java 8 (a.k.a 1.8)
JSR 337, what's new
* Language changes:
lambda expressions (JSR 335, includes method handles)
continuation of Project Coin (small language improvements)
annotations on Java types
* Library changes:
Improved Date and Time API
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