J2SE Evolution

Java 7 New Features

Java SE 7 Features and Enhancements:
http://www.oracle.com/technetwork/java/javase/jdk7-relnotes-418459.html
A look at Java 7's new features：
http://radar.oreilly.com/2011/09/java7-features.html




Concurrency Utilities Enhancements & Fork/Join：
http://docs.oracle.com/javase/tutorial/essential/concurrency/forkjoin.html


Strings in switch Statements：
http://docs.oracle.com/javase/7/docs/technotes/guides/language/strings-switch.html

引用

String.equals 作为比较的依据，并且字符串是大小写敏感的

Objects 工具类，使用举例如下：

Objects.requireNonNull(someObject);
someObject.doCalc();

Generics 声明时使用 Diamond Operator <>:
http://docs.oracle.com/javase/7/docs/technotes/guides/language/type-inference-generic-instance-creation.html
before:

Map<String, List<String>> anagrams = new HashMap<String, List<String>>();

now:

Map<String, List<String>> anagrams = new HashMap<>();

Underscores in Numeric Literals:
http://docs.oracle.com/javase/7/docs/technotes/guides/language/underscores-literals.html
Binary Literals 二进制整数:
http://docs.oracle.com/javase/7/docs/technotes/guides/language/binary-literals.html
Underscores in Numeric Literals & Binary Literals 可参见本：
http://wuaner.iteye.com/admin/blogs/1668172

Java 8 New Features

http://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.html