Java SE 7 New Features and Enhancements
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This document summarizes new features and enhancements in Java SE 7, including allowing strings in switch statements, binary and underscored numeric literals, try-with-resources for automatic resource management, and the diamond operator for simplifying generic object creation. It also briefly mentions features like multiple exception handling in a catch clause, the Path API for type-safe file paths, directory streaming and watching capabilities in NIO.2, and the future of Java focusing on productivity, performance, and modularization.
Java SE 7 New Features and Enhancements
- 1. Java SE 7 New Features & Enhancements Fu Cheng @alexcheng1982
- 2. Author of Understanding the Java 7 Author of technical articles on
- 3. Agenda • Usefull tips – Language – IO • No deep dive topics
- 6. Why Java • Easy to learn – Simple • Easy to use – Strong community – All kinds of third-party libraries • HARD to do things WRONG – Static typed – Rigid syntax
- 7. Why Java 7 • 5 years from Java SE 6 to Java SE 7 • New features – JVM level – Language level – API • Enhancements – Performance – Management – Documentation
- 8. String in Switch • “switch” statement • Prior to Java 7 – Can only use data type compatible with integer in “switch” • Java 7 – String type is allowed • Under the hood – Switch by string hash code
- 9. Sample
- 10. Numeric Literals • Java only supports literals of primitive types – List & map literals – Java SE 8 (maybe) • Binary literals – Prefixed with 0b or 0B • 0b001001 • Underscores in literals – Align for readability • 5_6.3_4
- 11. Exception Handling • Multiple exception types in one catch clause
- 12. try-with-resources • Use try clause to manage resources – “finally” not required – Resource released automatically • Make you own resource manageable by try clause – Implement java.lang.AutoCloseable – “close”method invoked automatically
- 14. Diamond Operator • Use diamond (<>) operator to simply generic objects creation Old way New way
- 15. Path • java.nio.file.Path – New abstraction for file path – Say goodbye to using string for file path – Type safe
- 16. Directory Stream • java.nio.file.DirectoryStream • List files in directory • Provide better performance than “File.list” and “File.listFiles” • Extend from Iterable
- 17. Directory Watcher • Get notified when files changed in a directory – Entry created, modified or deleted
- 18. Those Not Included • JSR 292 – “invokedynamic” instruction • Concurrency utilities – Fork/join framework – Phaser • I18N – Unicode 6.0 – IETF BCP 47 • NIO.2 – Zip/jar file system – Async I/O • JDBC 4.1
- 19. Future of Java • Productivity – Enhanced for loop (Java SE 5) – try-with-resources (Java SE 7) – Diamond operator (Java SE 7) – Lambda expression (Java SE 8) • Performance – Fork/join framework (Java SE 7) – Collection framework enhancements (Java SE 8) • Modularization – Project Jigsaw (Java SE 8)