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Getting ready to java 8
- 1. Getting ready to Java 8 Sergey Morenets, [email protected] 24 July 2014 г.
- 2. About author • Works in IT since 2000 • 11 year of Java SE/EE experience • Occupied senior Java developer/Team Lead positions • Winner of 2013 JBoss Community Recognition Award. https://www.jboss.org/jbcra
- 3. About author • 6 times speaker at Odessa Java User Group • 2 times speaker at JEEConf (2013 and 2014) in Kiev • Speaker at Java Breeze 2013 in Odessa • Speaker at Java Day 2014 in Minsk • Works 2 years as Java lector
- 4. Java 8 • Java 8 has been influenced by Scala much more than how Scala has been influenced by Java • Most expected Java release ever
- 7. Java 8 • Code name Kenai • Specification JSR-337 • Inspired by Scala, Google Guava and Joda Time
- 8. Java 8 • Project Lambda • Streams API • Functional interfaces • Java time • Method references • Repeatable & time annotations • Nashorn • Accumulators
- 9. Java 8 • Method Thread.stop() was deprecated in 1998 and rewritten to throw exception in 2014.
- 10. Schedule • 2012/04/26 M1 • 2012/06/14 M2 • 2012/08/02 M3 • 2012/09/13 M4 • 2012/11/29 M5 • 2013/01/31 M6 • 2013/06/13 Feature Complete • 2013/09/05 Developer Preview • 2014/01/23 Final Release Candidate • 2014/03/18 General Availability
- 11. Java 7
- 12. Java 7
- 13. Project Lambda
- 14. Project Lambda
- 15. Project Lambda
- 16. Java 7
- 17. Project Lambda
- 18. Project Lambda
- 19. Java 7
- 20. Project Lambda
- 21. Project Lambda
- 22. Project Lambda • Lambdas are not serializable • Applied to functional interfaces(with SAM) • Cannot use this • Not applied to abstract classes(even with SAM)
- 23. Project Lambda • Function • Predicate • Consumer • Supplier • BinaryOperator
- 24. Project Lambda Interface Description Function Function with single argument and result Predicate Tests condition of single argument Consumer Performs operation over single argument Supplier Supplies results BinaryOperator Functions with two arguments and results
- 28. Lambda vs Anonymous Type Lambdas(ms) Anonymous classes (ms) Execution 364 329 Capturing 316 309 Linkage 354 313
- 29. Disadvantage
- 30. Java 7
- 31. Method reference
- 32. Method reference
- 33. Java 7
- 34. Streams
- 35. Streams
- 36. Streams
- 37. Streams
- 38. Java 7
- 39. Streams
- 41. Streams
- 42. Performance
- 43. Performance Operation Sequential, sec Parallel,sec Slow operation 1.0 0.4 Quick operation 0.3 2.4
- 45. Parallelism level • Parallel streams use ForkJoinPool to split and combine tasks • By default number of threads is equal to number of processors • This behavior may be overridden by changing system property java.util.concurrent.ForkJoinPool.common.parallelism
- 46. Streams
- 47. Streams
- 48. Streams
- 49. Streams
- 50. Java 7
- 51. Streams
- 54. Iteration test Use case Time(ms) For-each loop 35 forEach(lambda) 79 forEach(consumer) 12
- 55. Java 7
- 56. Default methods
- 57. Default methods
- 58. Default methods
- 59. Default methods • equals • hashCode • toString
- 60. Java 7
- 61. Java 7
- 62. Java 7
- 63. Optional
- 64. Optional
- 65. Optional
- 66. Construct date
- 67. Java 7
- 68. Java Time
- 69. Java Time
- 70. Java Time
- 71. Java Time
- 72. Java 7
- 73. Java Time
- 74. Time difference
- 75. Java Time
- 76. I/O
- 77. I/O
- 78. Encoding
- 79. Annotations
- 80. Annotations
- 84. Annotations • Up to Java 7, an annotation was applied to a declaration. • A declaration is a part of code that introduces a new name.
- 85. Annotations • Type • Method • Field • Annotation • Package • Local variable
- 86. Type annotations
- 87. Type annotations • In Java 8, you can annotate any type use. • This can be useful in combination with tools that check for common programming errors
- 88. Type annotations
- 89. Type annotations • Generic type arguments • Superclass and implemented interface • Constructor invocations • Casting and instanceof • Exception specifications • Wild card and type bounds
- 90. Type annotations
- 91. Nashorn
- 92. Nashorn • Based on Da Vinci Machine • Intends to enable Java developers embedding of JavaScript in Java applications • Successor of JavaScript Rhino engine which was started in 1997 by Netscape and maintained by Mozilla.
- 93. Java 7
- 94. Nashorn
- 95. Performance Operation Rhino(Java 7) ,sec Nashorn (Java 8) print 3.1 0.9 String operations 1.0 0.4 Math operations 1.4 0.1
- 96. Collections • Improved HashMap • Balanced tree to avoid high collisions
- 97. Collections
- 98. Collections
- 99. Performance Number of items Java 7,ms Java 8 1000 7 9 5000 67 47 15000 653 406 30000 2645 1252 50000 7842 3820
- 100. Accumulators • Scalable updatable variables. Maintaining a single count, sum, etc., that is updated by possibly many threads is a common scalability problem. • Added features that make ConcurrentHashMap and classes built from them more useful as caches. Better support for maps with large numbers of elements. • Added functionality and improved performance for ForkJoinPool
- 101. Benchmark
- 102. Benchmark
- 103. Benchmark
- 104. Benchmark Number of threads AtomicLong LongAdder 1 236 177 2 586 138 4 590 46 8 501 49 16 438 48 32 459 52
- 105. Metaspace • Replacement of Permanent Generation • New JVM arguments • Resides in the heap and can be resized