千呼萬喚始出來的Java SE 7

千呼萬喚始出來的 Java SE 7 ,[object Object],[object Object],[object Object]

議程 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Java 進化史？ 2011/07/28 2002/02/13 2004/09/29 2006/12/11

A / B 計畫 ,[object Object],[object Object]

JDK7 ... λ Language support for collections Annotations on Java types Jigsaw

JDK7 有 ... ,[object Object],[object Object],NIO.2 Coin Invoke Dynamic Concurrency Updates

Small language enhancements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

反組譯 ... 先用 hashCode() 再用 equals()

Binary integral literals and underscores in numeric literals ,[object Object],[object Object]

Multi-catch 都作一樣的事略 ... 略 ...

Multi-catch ,[object Object],try { /* throws some ReflectiveOperationException */ } catch ( final ClassNotFoundException ex1) { /* body */ } catch ( final IllegalAccessException ex2) { /* body */ }

More precise rethrow ,[object Object],... ... // 作一些事沒有宣告 Exception

More precise rethrow ,[object Object],... ...

Inferring Types with <> ,[object Object],[object Object],[object Object]

Inferring Types with <> ,[object Object],[object Object]

Inferring Types with <> ,[object Object]

Try-with-resources ,[object Object]

Try-with-resources try ResourceSpecification Block ⇒ { final VariableModifiers_minus_final R #resource = Expression ; Throwable #primaryException = null; try ResourceSpecificationtail Block catch (Throwable #t) { #primaryException = t; throw #t; } finally { if (#resource != null) { if (#primaryException != null) { try { #resource.close(); } catch(Throwable #suppressedException) { #primaryException.addSuppressed(#suppressedException); } } else { #resource.close(); } } } }

Try-with-resources ,[object Object],try-with-resources

Try-with-resources ,[object Object],[object Object],[object Object]

Try-with-resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Heap pollution ,[object Object],[object Object],要求編譯器檢查傳入引數是不是都是 T 型態

Heap pollution ,[object Object],[object Object],.....: warning: [unchecked] unchecked generic array creation of type java .util.List<java.lang.String>[] for varargs parameter Util.doSome(Arrays.asList("three", "four"), Arrays.asList(“five", “six")); ^ 1 warning

Heap pollution ,[object Object],[object Object],[object Object],[object Object],[object Object]

Simplified Varargs Method Invocation ,[object Object],....: warning: [unchecked] Possible heap pollution from parameterized var arg type T public static <T> List<T> doSome(T... t) { ^ where T is a type-variable: T extends Object declared in method <T>doSome(T...) 1 warning 提醒設計 doSome() 保證不會發生 Heap Pollution

Simplified Varargs Method Invocation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Simplified Varargs Method Invocation ,[object Object]

Unicode 6.0.0 ,[object Object],繪文字（ emoji ）

Unicode 6.0.0 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JDBC 4.1 ,[object Object],[object Object],[object Object],[object Object]

JDBC 4.1 ,[object Object],[object Object],java -D javax.sql.rowset.RowSetFactory =com.sun.rowset.RowSetFactoryImpl

NIO ,[object Object],[object Object],[object Object],[object Object],[object Object],NIO2 ,[object Object],[object Object],[object Object],[object Object]

File System API ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File System API ,[object Object],[object Object],[object Object],[object Object],[object Object]

關於 Path ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

關於 Path ,[object Object],[object Object]

關於 Path ,[object Object],[object Object],[object Object],同一階層 path.equals(otherPath) Path path = ...; for (Path name: path) { System.out.println(name); }

檔案移動與複製 ,[object Object],[object Object],[object Object]

檔案屬性（ Metadata ） ,[object Object]

檔案屬性（ Metadata ） ,[object Object],[object Object]

檔案屬性（ Metadata ） ,[object Object],[object Object],[object Object]

目錄讀取 ,[object Object],[object Object],[object Object]

FileVisitor 啟始目錄目錄檔案鏈結檔案檔案 visitFile visitFile visitFile visitFile preVisitDirectory preVisitDirectory postVisitDirectory postVisitDirectory

監看目錄修改 ,[object Object]

新舊之間 ,[object Object],[object Object]

Asynchronous Channel API ,[object Object],[object Object],[object Object],[object Object],[object Object]

Asynchronous Channel API ,[object Object],[object Object],[object Object]

Asynchronous Channel API ,[object Object]

Asynchronous Channel API ,[object Object],[object Object],Future<Void>

Asynchronous Channel API ,[object Object],[object Object]

Concurrency Updates ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fork / Join 模式 ,[object Object],[object Object]

Fork / Join 框架不需傳回值的子動作透過泛型傳回值的子任務

Fork / Join 框架 ,[object Object],[object Object],[object Object],[object Object]

Fibonacci 結果 1134903170 耗時 24608

Fibonacci .... you'd pick some minimum granularity size for which you always sequentially solve rather than subdividing. 結果 1134903170 耗時 199604

搜尋檔案結果 665 耗時 12813

搜尋檔案結果 665 耗時 7596

JSR292 / Da Vinci Machine 專案

靜態定型語言 ,[object Object],[object Object]

靜態定型語言 2: invokestatic #3 // Method doSome:(Ljava/lang/String;)Ljava/lang/Integer; 17: invokevirtual #7 // Method Other.doOther:(Ljava/lang/String;)Ljava/lang/Integer; 32: invokeinterface #9, 2 // InterfaceMethod Another.doAnother:(Ljava/lang/String;)Ljava/lang/Integer;

動態定型語言 ,[object Object],[object Object],function max(m, n) { if(n.lessThan(m)) { return m; } return n; } def max(m, n): return m if n.lessThan(m) else n JavaScript Python

動態定型語言的挑戰 ,[object Object],[object Object],[object Object],[object Object],function max(m, n) { if( n.lessThan(m )) { return m; } return n; }

動態定型語言的挑戰 ,[object Object],[object Object],[object Object],[object Object],MyObject max( MyObject x, MyObject y) { if( n.lessThan(m) ) { return n; } return m; } invokevirtual #9 // Method MyObject.lessThan:(Ljava/lang/MyObject;)Ljava/lang/Boolean;

動態定型語言的挑戰 ,[object Object],[object Object],[object Object],[object Object]

動態定型語言的挑戰 ,[object Object],[object Object]

JSR 292 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],invokedynamic <method-specification> <n>

[object Object],[object Object],a = 40; b = a + 2; bipush 40 istore_1 iload_1 invokestatic Method java/lang/Integer.valueOf:"(I)Ljava/lang/Integer;"; bipush 2 invokestatic Method java/lang/Integer.valueOf:"(I)Ljava/lang/Integer;"; invokedynamic InvokeDynamic REF_invokeStatic: Example.mybsm: "(Ljava/lang/invoke/MethodHandles/Lookup; Ljava/lang/String; Ljava/lang/invoke/MethodType;) Ljava/lang/invoke/CallSite;": +: "(Ljava/lang/Integer; Ljava/lang/Integer;) Ljava/lang/Integer;"; the invokedynamic call site is + method implementation currently unknown bootstrap method

[object Object],類似 Reflection ？

JSR 292 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JSR 292 ,[object Object],[object Object]

Recently rediscovered diagrams prove Leonardo invented the first JVM ？ . http://openjdk.java.net/projects/mlvm/ 感謝 ,[object Object],[object Object],[object Object],Orz...

千呼萬喚始出來的Java SE 7

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