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Pebank java handsout

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Javaヂカラ #Java最新動向
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2018/2/8
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Pebank java handsout

  1. 1. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java Java 2018 2 8
  2. 2. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Oracle Java 2
  3. 3. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | : "Java " : Java SE 8 "Java " : Java SE 9 : Oracle University 1 2 3 3 4
  4. 4. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 4
  5. 5. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 2020 IT IT IT IT IT IT 5 (1): IT : - IT (2016 6 ) IT
  6. 6. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 6 (2): ( ) : - IT (2016 6 ) : - IT (2016 6 ) IoT AI
  7. 7. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | (3): IT • – IT SoE / SoI = – SoR = 7
  8. 8. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | IT IT IT 8 (4): IT : - IT (2016 6 ) 5 IT
  9. 9. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE 8 Java 9
  10. 10. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 1995 Sun Microsystems ( ) ( TV ) 10
  11. 11. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java TIOBE Programming Community Index http://www.tiobe.com/tiobe-index/ PYPL: PopularitY of Programming Language http://pypl.github.io/PYPL.html 15.0% 16.0% 16.5% 29.0% 17.5% 1.0% 26.5% 13.0% 4.5% 0.5% 41.5% 22.5% 10.0% 2.0% 0.5% 1.0% 6.5% 5.0% 2.5% 16.5% 12.5% 15.0% 18.5% 28.0% 7.0% 2.0% 15.5% 9.0% 5.0% 0.0% 47.5% 21.0% 10.5% 2.5% 1.5% 1.5% 0.0% 17.5% 0.5% 11.0% 0% 10% 20% 30% 40% 50% C C++ C# VB.NET Visual Basic 6.0 Objective-C COBOL PL/SQL ABAP Fortran Java JavaScript PHP Perl Python Ruby HTML4 HTML5 N=200 (2013 ) 11
  12. 12. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java Java 12 • Java Oracle JDK • = Public Update
  13. 13. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 13 Java SE • 1996 • Java • 1998 • Collections • 2002 • JCP • 2006 • JVMTI • 2014 • Lambda • 1997 • JDBC • 2000 • HotSpot • 2004 • Generics • 2011 • Oracle • 2017/9/21 GA 1.0 1.2 1.1 1.3 1.4 5.0 6 7 8 9
  14. 14. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java 14
  15. 15. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 0 10 20 30 40 50 60 70 Java static Oracle Certified Java Programmer, Bronze SE 7 Java 58.5 57.8 58.5 38.2 45.9 49.2 25.6 38.6 33.8 static 26.8 47.8 60.8 15 ≠ 2015 : 2015 6 : 12 /772 : Oracle Certified Java Programmer, Bronze SE 7 / : 20 /20
  16. 16. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • • – • – new • – 16 - 1 1. List<Employee> employeeList = new ArrayList<>(); 2. employeeList = EmployeeContainer.getList(); 3. String name = ""; 4. name = employee.getName(); 1. List<Employee> employeeList = EmployeeContainer.getList(); 2. String name = empoyee.getName();
  17. 17. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • – • • – • ( ) – 17 : • – • • – • (= ) → • →
  18. 18. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • – Item (setter/getter) • – • • 18 - 2 1. public class Main { 2. public void method(Item item) { 3. int value = item.getAmount(); 4. item.setAmount(value + 1); 5. } 6. } 7. public class Item { 8. private int amount; 9. public void setAmount(int amount) { 10. this.amount = amount; 11. } 12. public int getAmount() { 13. return amount; 14. } 15. } Item
  19. 19. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • – Item 19 1. public class Main { 2. public void method(Item item) { 3. item.addAmount(1); 4. } 5. } 6. public class Item { 7. private int amount; 8. public void addAmount(int value) { 9. amount = amount + 1; 10. } 11. } Tips:
  20. 20. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | - 3 • + StringBuilder::append • StringBuffer 20 1. StringBuilder sb = new StringBuilder(); 2. sb.append("[" + str + "]"); • String + String StringBuilder::append • StringBuffer::append synchronized StringBuilder
  21. 21. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | StringBuilder::append • StringBuilder::append 21 1. StringBuilder sb = new StringBuilder(); 2. sb.append("["); 3. sb.append(str); 4. sb.append("]"); • StringBuffer::append → + StringBuilder … • StringBuilder::new
  22. 22. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • – JDK ( ) – # Japanese imperial calendar # # Meiji since 1868-01-01 00:00:00 local time (Gregorian) # Taisho since 1912-07-30 00:00:00 local time (Gregorian) # Showa since 1926-12-25 00:00:00 local time (Gregorian) # Heisei since 1989-01-08 00:00:00 local time (Gregorian) # NewEra since 2019-05-01 00:00:00 local time (Gregorian) calendar.japanese.type: LocalGregorianCalendar calendar.japanese.eras: ¥ name=Meiji,abbr=M,since=-3218832000000; ¥ name=Taisho,abbr=T,since=-1812153600000; ¥ name=Showa,abbr=S,since=-1357603200000; ¥ name=Heisei,abbr=H,since=600220800000; ¥ name=NewEra,abbr=NE,since=1556636400000 Tips: (Java SE 6 ) $JAVA_HOME/jre/lib/calendars.properties *1 calendars.properties *1 JDK 9 calendars.properties " -Djdk.calendar.japanese.supplemental.era="name=NewEra,abbr=NE,since=1556636400000"" 22
  23. 23. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java 23
  24. 24. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | : Java SE 8 • Java SE 5 (2004.5 ) – BigDecimal – (Generics) – (Annotation) – (enum) for – Unicode 4.0 – JAR (Pack200) • Java SE 7 (2011.7) – Project Coin (JSR 334) – InvokeDynamic (JSR 292) – NIO.2 (JSR 203) – JDBC 4.1 – Fork-Join (JSR 166y) – JAXP, JAXB, JAX-WS – JavaFX 2.0 – ClassLoader – G1GC • Java SE 6 (2006.12) – AWT Swing – JDBC 4.0 – JAXP (Java API for XML Processing) 1.4 – Executors (JSR166) – Web – Windows – Windows Aero – Unicode (java.text.Normalizer) • Java SE 8 (2014.3) – Project Lambda • (JSR 335) • Stream API – Type Annotation (JSR 308) – Date and Time API (JSR 310) – JavaScript (Nashorn) – JavaFX 8 – Hotspot JRockit 24
  25. 25. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 1. public class PriceTest { 2. public static void main(String... args) { 3. PriceTest test = new PriceTest(); 4. System.out.println(" : " + test.calcPrice(1000, 0.07)); 5. 6. } 7. 8. public int calcPrice(int l, double d) { 9. int p = (int) (l * (1 - d)); 10. return p; 11. } 12.} : 1,000 0.07 930 - 4 = * (1 - ) int double 25
  26. 26. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | - 4 BigDecimal … 1. public class PriceTest { 2. public static void main(String... args) { 3. PriceTest test = new PriceTest(); 4. System.out.println(" : " + test.calcPrice(1000, 0.07)); 5. } 6. 7. public int calcPrice(int l, double d) { 8. BigDecimal discount = new BigDecimal(d); 9. int p = BigDecimal.ONE.subtract(discount).multiply(BigDecimal.valueOf(l)) 10. .setScale(0, RoundingMode.FLOOR).intValue(); 11. return p; 12. } 13.} 26 BigDecimal(double) : new BigDecimal(0.1) → 0.1000000000000000055511151231257827021181583404541015625
  27. 27. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | BigDecimal 1. public class PriceTest { 2. public static void main(String... args) { 3. PriceTest test = new PriceTest(); 4. System.out.println(" : " + test.calcPrice(1000, "0.07")); 5. } 6. 7. public int calcPrice(int l, String d) { 8. BigDecimal discount = new BigDecimal(d); 9. int p = BigDecimal.ONE.subtract(discount).multiply(BigDecimal.valueOf(l)) 10. .setScale(0, RoundingMode.FLOOR).intValue(); 11. return p; 12. } 13.} BigDecimal 27 BigDecimal BigDecimal =
  28. 28. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 1. private List fileToList(String fileName) throws Exception { 2. String line; 3. List lines = new ArrayList(); 4. BufferedReader reader = null; 5. try { 6. reader = new BufferedReader(new FileReader(fileName)); 7. while((line = reader.readLine()) != null) { 8. lines.add(line); 9. } 10. reader.close(); 11. } catch(Exception e) { 12. throw new CustomException(); 13. } 14. return lines; 15.} 28 : J2SE 1.4 … - 5 … ( → ) (→ ) reader close
  29. 29. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 1. private List<String> fileToList(String fileName) throws CustomSystemException { 2. List<String> lines = new ArrayList<String>(); 3. BufferedReader reader = null; 4. try { 5. reader = new BufferedReader(new FileReader(fileName)); 6. String line = null; 7. while(reader.readLine() != null) { 8. lines.add(line); 9. } 10. } catch (FileNotFoundException e) { 11. throw new CustomSystemException(FILE_NOT_FOUND, e); 12. } catch(IOException e) { 13. throw new CustomSystemException(FILE_READ_ERROR, e); 14. } finally { 15. try { 16. if (reader != null) reader.close(); 17. } catch(IOException e) { 18. System.out.println("ERROR at closing Reader: " + e.getMessage()); 19. } 20. } 21. return lines; 22. } 29 - 5 try-catch finally (→ ) : Java SE 6 …
  30. 30. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | : Java SE 7 1. private List<String> fileToList(String fileName) throws CustomException { 2. List<String> lines = new ArrayList<>(); 3. try(BufferedReader reader = new BufferedReader(new FileReader(filename))) { 4. String line; 5. while((line = reader.readLine()) != null) { 6. lines.add(line); 7. } 8. } catch(FileNotFoundException e) { 9. throw new CustomException(FILE_NOT_FOUND, e); 10. } catch(IOException e) { 11. throw new CustomException(FILE_READ_ERROR,e); 12. } 13. return lines; 14.} + ( ) try-with-resources ( → API ) 30 Java =
  31. 31. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | try-with-resources• JSR 334: Project Coin 1. Switch String 2. Multi-catch 3. try-with-resrouces 4. 5. 31 : Java SE 7 class MyResource implements java.lang.AutoCloseable { @Override public void close() throws Exception { // ... } } try (MyRecourse r1 = new MyResrouce(); MyResource r2 = new MyResoruce() ) { // ... } catch(MyException1 | MyException2 e) { e.printStackTrace(); } Reader/Writer File I/O API JDBC API (Java SE 7 ) Stream API (Java SE 8) AutoCloseable ( ) catch (Multi-catch)
  32. 32. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | API : Java SE 7 NIO.2 1. private List<String> readFile(String fileName) { 2. try { 3. return Files.readAllLines(Paths.get(fileName), Charset.defaultCharset()); 4. } catch (IOException e) { 5. throw new SytemException(FILE_READ_ERROR, e); 6. } 7. } 32 Java SE 7 NIO.2 API = • •
  33. 33. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • • – • – • – ( ) • • Strategy 33 - 6 1. public String evaluate(int score) { 2. if (score > 80) { 3. return "A"; 4. } else { 5. if (score > 60) return "B"; 6. else return "C"; 7. } 8. } 1. public String evaluate(int score) { 2. if (score > 80) return "A"; 3. if (score > 60) return "B"; 4. return "C"; 5. }
  34. 34. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • (Strategy ) 34 - 6 1. public class Calculator { 2. public static final int ADDITION = 1; 3. public static final int SUBSTRACTION = 2; 4. private int type; 5. public Calculator(int type) { 6. this.type = type; 7. } 8. public int calculate(int a, int b) { 9. int result = 0; 10. if (type == ADDITION) { 11. result = a + b; 12. } else if (type == SUBSTRACTION) { 13. result = a - b; 14. } 15. return result; 16. } 17. } 1. public class Calculator { 2. private Type type; 3. public Calculator(Type type) { 4. this.type = type; 5. } 6. public int calculate(int a, int b) { 7. int result = type.execute(a, b); 8. return result; 9. } 10. } 11. public interface Type { 12. int execute(int a, int b); 13. } 14. public class Addition implements Type { 15. public int execute(int a, int b) { 16. return a + b; 17. } 18. } 19. public class Substraction implements Type { 20. public int execute(int a, int b) { 21. return a - b; 22. } 23. } Type if
  35. 35. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • Java SE 8 … • 35 1. public class Calculator { 2. public int calculate(int a, int b, Type type) { 3. return type.execute(a, b); 4. } 5. } 6. @FunctionalInterface 7. interface Type { 8. int execute(int a, int b); 9. } 1. Calculator calc = new Calculator(); 2. System.out.println( calc.calculate(3, 1, (m, n) -> m + n )); 3. System.out.println( calc.calculate(3, 1, (m, n) -> m - n )); Type SAM Type
  36. 36. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | : Java SE 8 in Java • (Functional Programming) is … • is … • Java : – Java SE 8 • API ( ) (Collection::removeIf List::replaceAll ) • API (Stream API) 36 ( )
  37. 37. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • … 37 is - 1. public class Calc { 2. private int x; // 3. public int multiply(int a, int b) { 4. return a * b; 5. } 6. } 1. public class Calc { 2. private int x; 3. public int multiply(int y) { 4. return x *= y; // 5. } 6. } ⭕ ⭕ ❌ ❌
  38. 38. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | for (String data : list) { if (data.contains("c")) { System.out.println(data); } } list.stream() .filter(data -> data.contains("c")) .forEach(System.out::print); - List<String> list = Arrays.asList("abc", "bcd", "cde", "def", "efg"); ( ): = (Java SE 8 ): = API 38 ( ) 1. 2. 3. 1.
  39. 39. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • ( ) – – • Java ( ) • = – – Java SE 8 API (java.util.function ) 39 list.stream().filter(data -> data.contains("c")).forEach(System.out::print);
  40. 40. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Arrays.sort(array, new Comparator<String>(){ @Override public int compare(String a, String b) { return b.compareToIgnoreCase(a); } } ); System.out.println( Arrays.deepToString(array)); Arrays.sort(array, (a, b) -> b.compareToIgnoreCase(a) ); System.out.println( Arrays.deepToString(array)); 40 (java.util.Comparator ) String[] array = {"Java", "Candy", "Oracle", "Duke"}; (Java SE 8) Java SE 8 java.util.Comparator • → • a b → a b ( OK)
  41. 41. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Stream API • API ( ) – ( ) – ( ) • 41 Stream (Initiate) (Process) (Operate) Stream.of() Arrays.stream(T) Collection.stream() … forEach() reduce() collect() max(),min(),average() count(),sum() … filter() map() flatMap() peek() …
  42. 42. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | : in Java • Java SE 8 – • OK – – – – • Collection Stream API – – API • Java 42
  43. 43. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • –Java – • – 43
  44. 44. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE 9 Java 44
  45. 45. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE 9 2017 9 21 45
  46. 46. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE 9 • … – • … – – Module System ! • • JDK 46
  47. 47. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE 9 BehindthescenesNewfunctionality SpecializedNewstandards HousekeepingGone • Store Interned Strings in CDS Archives • Improve Contended Locking • Compact Strings • Improve Secure Application Performance • Leverage CPU Instructions for GHASH and RSA • Tiered Attribution for javac • Javadoc Search • Marlin Graphics Renderer • HiDPI Graphics on Windows and Linux • Enable GTK 3 on Linux • Update JavaFX/Media to Newer Version of GStreamer • Jigsaw –Modularize JDK • Enhanced Deprecation • Stack-Walking API • Convenience Factory Methods for Collections • Platform Logging API and Service • jshell: The Java Shell (Read-Eval-Print Loop) • Compile for Older Platform Versions • Multi-Release JAR Files • Platform-Specific Desktop Features • TIFF Image I/O • Multi-Resolution Images • Process API Updates • Variable Handles • Spin-Wait Hints • Dynamic Linking of Language-Defined Object Models • Enhanced Method Handles • More Concurrency Updates • Compiler Control • HTTP 2 Client • Unicode 8.0 • UTF-8 Property Files • Implement Selected ECMAScript 6 Features in Nashorn • Datagram Transport Layer Security (DTLS) • OCSP Stapling for TLS • TLS Application-Layer Protocol Negotiation Extension • SHA-3 Hash Algorithms • DRBG-Based SecureRandom Implementations • Create PKCS12 Keystores by Default • Merge Selected Xerces 2.11.0 Updates into JAXP • XML Catalogs • HarfBuzz Font-Layout Engine • HTML5 Javadoc • Parser API for Nashorn • Prepare JavaFX UI Controls & CSS APIs for Modularization • Modular Java Application Packaging • New Version-String Scheme • Reserved Stack Areas for Critical Sections • Segmented Code Cache • Ahead-of-Time Compilation • Indify String Concatenation • Unified JVM Logging • Unified GC Logging • Make G1 the Default Garbage Collector • Use CLDR Locale Data by Default • Validate JVM Command-Line Flag Arguments • Java-Level JVM Compiler Interface • Disable SHA-1 Certificates • Simplified Doclet API • Deprecate the Applet API • Process Import Statements Correctly • Annotations Pipeline 2.0 • Elide Deprecation Warnings on Import Statements • Milling Project Coin • Filter Incoming Serialization Data • Remove GC Combinations Deprecated in JDK 8 • Remove Launch-Time JRE Version Selection • Remove the JVM TI hprof Agent • Remove the jhat Tool JDK 9 / JDK 9 47
  48. 48. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • Module System (Jigsaw) Module System (Jigsaw) p p public ( ) Module public ≠ (= ) JRE 48 • JEP (JDK Enhancement Proposal) – JEP 261: Module System – JEP 200: The Modular JDK – JEP 201: Modular Source Code – JEP 220: Modular Run-Time Images – Plus • JEP 260: Encapsulate Most Internal APIs • JEP 282: jlink: The Java Linker
  49. 49. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JEP 213: Milling Project Coin • Project Coin (JEP 334) – private @SafeVarargs • @SafeVarargs final , static , + private – try-with-resources final – – ("_") • Java SE 9 – private • (Java SE 8) 49
  50. 50. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | REPL (Read Eval Print Loop) for Java • • JShell (JEP 222) Read Eval) (Print) (Loop) 50
  51. 51. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JDK/JRE 51
  52. 52. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JDK/JRE: • tools.jar(JDK) rt.jar(JRE) • Extension (JEP 261) – java.ext.dirs – lib/ext • Endorsed Standards Override – java.endorsed.dirs – lib/endorsed • lib/applets 52
  53. 53. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • MetaSpace – • Native Memory • Permanent • OutOfMemoryError – – -XX:MaxMetaspaceSize=<NNN> : Java SE 8 JVM Thread Stack Permanent -XX: MaxPermSize Eden Survivor0 Survivor1 Old Java Permanent NativeJava C Heap C Heap Thread Stack Eden Survivor0 Survivor1 Old Java Native n HotSpot (Java SE 7) n HotRockit (Java SE 8) (static Java ) • JVM (Java SE 8) – HotSpot VM JRockit VM (HotRockit) MetaSpace (GC ) -Xloggc:<FILE> -XX:+PrintHeapAtGC -XX:+PrintGCDetails (JDK 9 ) -Xlog:gc*,gc+heap=trace:file=<FILE> 53
  54. 54. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • Garbage Collection – JVM • GC – Stop the World • GC – GC – GC* – GC (CMS) JEP 248: Make G1 the Default Garbage Collector • G1GC(Java SE 7 ) – GC • Region • Region GC (Young GC Mixed GC) – GC (-XX:MaxGCPauseMillis) • JDK 9 (JEP248) Stop the World (Full GC) Eden Survivor0 Survivor1 Old Perm O O S S E E S E OO O S ES E H S E E 54 *64bit OS ( JDK8)
  55. 55. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JEP 214: Remove GC Combinations Deprecated in JDK 8 • JDK 8 GC (JEP 173) – 55 • DefNew + CMS : -XX:-UseParNewGC -XX:+UseConcMarkSweepGC • ParNew + SerialOld : -XX:+UseParNewGC • ParNew + iCMS : -Xincgc • ParNew + iCMS : -XX:+CMSIncrementalMode -XX:+UseConcMarkSweepGC • DefNew + iCMS : -XX:+CMSIncrementalMode -XX:+UseConcMarkSweepGC -XX:-UseParNewGC • CMS foreground : -XX:+UseCMSCompactAtFullCollection • CMS foreground : -XX:+CMSFullGCsBeforeCompaction • CMS foreground : -XX:+UseCMSCollectionPassing Point: Perm (-XX:PermSize, -XX:MaxPermSize) JDK 9
  56. 56. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JVM/GC • Unified JVM Logging (JEP 158), Unified GC Logging (JEP 271) – "–Xlog" • -Xlog → -Xlog:all=warning:stdout:uptime,level,tags – GC "-Xlog:gc" 56 JDK8 JDK9 PrintGC -Xlog:gc PrintGCDetails -Xlog:gc* PrintHeapAtGC -Xlog:gc+heap=trace G1PrintHeapRegions -Xlog:gc+region=trace -Xlog:[<selection>]:[<output>]:[<decorators>]
  57. 57. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • JRE (JEP 231) – java –version: • "-version" – jar Manifest JRE-Version • 32bit Client JVM – 32 bit Windows Client VM Server VM JVM 57 Server VM Client VM • TieredStopAtLeve 1 (C1 JIT ) • Compilation threshold ( : 10,000 -> 1,000) • Code cache • G1GC ParallelGC
  58. 58. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | API API 58
  59. 59. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JEP 260: Encapsulate Most Internal APIs • API – API (Critical APIs) • – -jdkinternals jdeps • – java.lang.IllegalAccessException • – API – : API ( ) 59
  60. 60. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • Applet API (JEP289) – @Deprecated(since="9") • java.applet.AppletStub • java.applet.Applet • java.applet.AudioClip • java.applet.AppletContext • javax.swing.Japplet – ("forRemoval=true") • Java Plugin – Java Java – • IE Safari – Netscape plugin API (NPAPI) 60 Applet
  61. 61. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | API - • (JEP 223) – java –version – • java.runtime.version, java.vm.version, java.specification.version, java.vm.specification.version • CLDR (Common Local Data Repository) Locale Data (JEP 252) – JDK9 • java.locale.providers=CLDR, COMPAT, SPI – • Java SE 8 java.locale.providers=COMPAT,SPI 61 JDK8: 1.$MAJOR.0_$MINOR-b$BUILD JDK9: $MAJOR.$MINOR.$SECURITY+$BUILD
  62. 62. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | API - • JEP 226: UTF-8 Property Files – UTF-8 – ResourceBundle UTF-8 (JDK8 Latin-1) – native2ascii • java.policy (conf/security/java.policy) – untrusted code Thread.stop() • permission java.lang.RuntimePermission "stopThread"; 62
  63. 63. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | JEP 182: Policy for Retiring javac -source and -target Options • javac -source, -target "current + three back" – 63 Java SE 8 Java SE 5 JDK 9 9/1.9 + 8/1.8, 7/1.7, 6/1.6 --release (JEP 247) → : 9 ( ), 8, 7, 6 6 javac --release N javac -source N -target N -bootclasspath=/path/to/N/rt.jar
  64. 64. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • JavaDB (Apache Derby ) • JVM TI hprof • jhat • RMI CGI (java-rmi.exe java-rmi.cgi) • JMX RMIConnector IIOP • Windows 32bit Client VM • VisualVM (NetBeans profiler ) • native2ascii 64
  65. 65. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE 9 65
  66. 66. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Java SE • : 6 – – 2018 3 • (LTS): 3 – – 2018 9 • : 3 (1 , 4 , 7 , 10 ) – • – $YEAR.$MONTH (18.3, 18.9, ...) 66 Mark Reinhold’s Blog ( https://mreinhold.org/blog/forward-faster )
  67. 67. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 67 Java SE Version Release End of Public Update Extended Support 5 2004 5 2009 10 2015 5 6 2006 12 2013 2 2018 12 7 2011 7 2015 4 2022 7 8 2014 3 2019 1 * 2025 3 9 2017 9 2018 3 n/a 10(18.3) 2018 3 2018 9 n/a 11(18.9-LTS) 2018 9 ? 2026 9 Oracle Java SE Support Roadmap: http://www.oracle.com/technetwork/java/eol-135779.html Java SE 9 10 (18.3) Short Term Release • 2020 12 Java SE 8 Java Web Start 2018/1/26
  68. 68. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Beyond Java SE 9 • Java SE 10 (18.3) – JEP 286: Local-Variable Type Interface (Project Amber) • – JEP 305: Pattern Matching • switch 68 var list = new ArrayList<String>(); // infers ArrayList<String> var stream = list.stream(); // infers Stream<String> String formatted; switch (obj) { case Integer i: formatted = String.format("int %d", i); break; case Byte b: formatted = String.format("byte %d", b); break; case Long l: formatted = String.format("long %d", l); break; case Double d: formatted = String.format(“double %f", d); break; case String s: formatted = String.format("String %s", s); break; default: formatted = obj.toString(); } if switch
  69. 69. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • –Java SE 9 • Module System –JVM –Java … • 69
  70. 70. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | Oracle University 70
  71. 71. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | (Java / Middleware) - - ( ) (JVM / )(Java SE / EE) Java SE 7/8 I (3 ) Java SE 7/8 II (3 ) Java EE 6 (5 ) Java EE 7: Web (5 ) Java (3 ) Oracle WebLogic Server 12c: (2 ) Oracle WebLogic Server 12c: I (5 ) Java EE (5 ) UML / for Java (3 ) Java SE 7 New Features (2 ) Java SE 8 (2 ) UNIX/Linux (3 ) Web (3 ) Java EE 7 (2 ) Java EE 7: Back-end Server Application Development (5 ) Oracle Database 12c: SQL I (3 ) 71 Java (3 )
  72. 72. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | !! (1) Java Java UML Java SE 7/8 I § Java § Java § 1 ü ü ü ü static static § 2 ü ü ü ü § § java.lang § UML ü Composite / Factory Method / Strategy / Singleton / Adapter / Builder / Visitor / Observer / Command / Façade ü UML ( , , ) • Java for • Java SE 7/8 I ( ) 72 1 2 UML Java SE 7 I
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  74. 74. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | (3) Java Java SE 7 G1 GC JVM Java Flight Recorder Java Mission Control § § § G1 GC § JVM § Java Flight Recorder Mission Control § § § • Java SE 7/8 I • Java SE 7/8 II ( ) 74 !!
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  76. 76. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 1 2013 3 2 Oracle Java #1 IT - (2016 ) x2 98% Java SE Java SE 7/ 8 (2016 ) OCJP Gold Java Java Java 76
  77. 77. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • • : 2017 12 2 2018 5 31 • : RETAKE18JP • VUE Web 77
  78. 78. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | – : RETAKE18JP – : * – : 2017 12 4 2018 5 31 • 1 • 2 2017 7 15 • 2 78 * ORACLE MASTER Platinum Java EE Enterprise Architect 11gOCM, 11gOCMU, 12cOCM, 12cOCMU, 1Z0-866,1Z0-866-JPN, 1Z0-865, 1Z0-867
  79. 79. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | • • Oracle Database (ORACLE MASTER) – Bronze DBA 12c (1Z0-065) – Oracle Database 12c: Administration (1Z0-062) – Oracle Database 12c: Advanced Administration (1Z0-063) • PaaS (ORCLE MASTER Cloud) – Oracle Database Cloud Service (1Z0-160) – Oracle Java Cloud Service(1Z0-161) • Oracle Solaris Upgrade to Oracle Solaris 11 System Administrator (1Z0-820) Oracle Solaris 11 System Administration (1Z0-821) Oracle Solaris 11 Advanced System Administration (1Z0-822) 79 • Java SE – Java SE 8 Programmer I (1Z0-808) – Java SE 8 Programmer II (1Z0-809) – Upgrade Java SE 7 to Java SE 8 OCP Programmer (1Z0-810) – Upgrade to Java SE 8 OCP ( Java SE 6 and all prior versions) (1Z0-813) • Oracle WebLogic Server – Oracle WebLogic Server 12c: Administration I (1Z0-133) • MySQL – MySQL 5.6 Developer (1Z0-882) – MySQL 5.6 Database Administrator (1Z0-883)
  80. 80. Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 80
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