Java 버젼별 비교 정리

1. Java 버젼별 히스토리

http://en.wikipedia.org/wiki/Java_version_history

- Java5 (2004~2009)

- Java6 (2006~2013)

- Java7 (2011~ )

- Java8 (2014~ )

- Java9 (2016예정)

- Java10 (2018예정)

2. Java 버젼별 주요 기능

2.1 Java5 (Tiger)

- Generics

- Enhanced for Loop (foreach)

- Autoboxing/Unboxing

- Type-safe Enums

- Varargs

- Static Import

- Annotions (Metadata)

- Formatted IO

- Concurrent API (java.util.concurrent)

- Thread Priority Changes

- Garbage collection ergonomics

- StringBuilder class

- StringBuilder is almost always faster than StringBuffer

- StringBuffer unsynchronized version

2.2 Java6 (Mustang)

- JAX-WS (Web Services Client)

- javax.swing.GroupLayout

- Password prompting

- Free disk-space API

- Classpath wildcards

- Annotation processing done by javac

- Solaris Dynamic Tracing (DTrace) Support)

- jhat QQL (Jmap for heap dump)

- JConsole plugin API

- Monitoring and Management for the Java Platform

- OOME Handling

- Script Langauge Support

- JDBC 4.0 API

2.3 Java7 (Dolphin)

- Garbage-First Collector

- Java Programming Language

- Binary Literals

- Strings in switch Statements

- The try-with-resource Statement

- Catching Multiple Exception Types and Rethrowing Exceptions with Improved Type Checking

- Underscores in Numeric Literals

- Type Inference For Generic Instance Creation

- Improved Compiler Warnings and Errors When Using Non-Reifiable Formal Parameters with Varargs Methods

- NIO 2.0

- Fork-Join

- Dynamic Language Support

- JDBC 4.1 API

2.4 Java8 

- Remove the Permanent Generation

- Small VM

- Define a standard API for Base64 encoding and decoding

- Provide stronger Password-Based-Encryption (PBE) algorithm implementations in the SunJCE provider

- Parallel array sorting

- Interface improvements (static method, defender methods)

- Functional interfaces

- Lambdas

- Stream

- New date/time

- Generic type inference improvements

- Nashorn JavaScript Engine

3. Java 버젼별 성능비교

http://geeknizer.com/java-7-whats-new-performance-benchmark-1-5-1-6-1-7/#ixzz1ezWIHUc8

- Java5 -> Java6 : 18% 성능향상

- Java6 -> Java7 : 46% 성능향상

- 낮을 수록 좋은 성능

http://www.optaplanner.org/blog/2014/03/20/HowMuchFasterIsJava8.html

- Java6 -> Java7 : 평균 16% 성능향상

- Java7 -> Java8 : 평균 1% 성능향상

Java8 Reference

• http://openjdk.java.net/projects/jdk8/features#117
• http://www.techempower.com/blog/2013/03/26/everything-about-java-8/
• http://ttux.net/post/java-8-new-features-release-performance-code/
• http://docs.oracle.com/javase/tutorial/java/generics/genTypeInference.html
• http://java.dzone.com/articles/java-8-permgen-metaspace
• http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/Lambda-QuickStart/index.html
• http://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html
• https://blog.codecentric.de/en/2013/10/java-8-first-steps-lambdas-streams/
• http://zeroturnaround.com/rebellabs/java-8-explained-default-methods/
• http://java.dzone.com/articles/understanding-java-8-streams-1
• http://stackoverflow.com/questions/16635398/java-8-iterable-foreach-vs-foreach-loop
• http://blog.credera.com/technology-insights/java/java-8-part-1-lamdas-streams-functional-interfaces/
• http://blog.credera.com/technology-insights/java/java-8-part-2-nashorn/
• http://www.journaldev.com/2389/java-8-features-for-developers-lambdas-functional-interface-stream-and-time-api
• http://geekmonkey.org/articles/24-a-new-date-and-time-api-for-jdk-8
• http://howtodoinjava.com/2013/05/15/date-and-time-api-changes-in-java-8-lambda/