JavaSE7 Launch Event: Java7xGroovy

Transcript

1. +BWBʷ (SPPWZ
2. 8IP
   BN
   * 㾎ࢯ໊ɿத໺
   ༃࣏ʢBLB
   OPCFBOTʣ 㾎ॴଐɿ/55ιϑτ΢ΣΞגࣜձࣾ 㾎ϒϩάɿ౾ແ೔ه
   
   
   
   
   
   
   
   
   
   
   
   IUUQEIBUFOBOFKQOPCFBOT 㾎ϓϩμΫτɿ
   
   
   
   
   
   
   
   
   
   
   
   IUUQTHJUIVCDPNOPCFBOT
3. $ time groovy -e 'println "Hello, world!";' Hello, world! real 0m1.177s user 0m1.321s sys 0m0.171s $ time groovyclient -e 'println "Hello, world!";' Hello, world! real 0m0.029s user 0m0.001s sys 0m0.002s
5. +BWBͷͦͷػೳ (SPPWZʹ͸طʹ ͋Γ·͚͢ͲԿ͔ʁ
6. 4USJOHT
   JO
   4XJUDI
7. +BWB
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   4USJOHT
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   4XJUDI String s = ... switch (s) { case "quux": processQuux(s); // fall-through case "foo": case "bar": processFooOrBar(s); break; case "baz": processBaz(s); // fall-through default: processDefault(s); break; } 㾎4USJOH͕৚݅෼ذʹ࢖͑Δ Α͏ʹͳΓ·ͨ͠ʁ
8. (SPPWZ
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
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    import java.util.regex.Matcher Object x = ... switch (x) { case "abc": // xͷ಺༰͕"abc"ͷͱ͖ break case ~/a(.*)c/: // x͕ਖ਼نදݱύλʔϯʹϚον͢Δͱ͖ assert Matcher.lastMatcher[0][0] == "abbc" assert Matcher.lastMatcher[0][1] == "bb" break case 1..3: // x͕1ʙ3ͷൣғʹؚ·ΕΔͱ͖ break case [1,3,5]: // x͕1,3,5ͷͲΕ͔Ͱ͋Δͱ͖ break // .... }
9. (SPPWZ
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
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    switch (x) { // .... case String: // x͕StringͷΠϯελϯεͰ͋Δͱ͖ break case {it % 2 == 0}: // x͕ۮ਺ͷͱ͖ break case null: // x͕nullͷͱ͖ʂʂʂ break case a: // a͕ϢʔβఆٛܕͷΠϯελϯεͰ // a.isCase(x)͕trueͷͱ͖ break }
10. -BNCEB
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    -BNCEB
    $MPTVSF double highestScore = students .filter(#{ s -> s.gradYear == 2010 }) .map( #{ s -> s.score }) .max(); 㾎͍ͭʹ+BWBʹ΋Ϋϩʔδϟ͕ʁ
12. (SPPWZ
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    $MPTVSF
     㾎ຊ෺ͷΫϩʔδϟ͕طʹ͋Γ·͢ def highestScore = students. findAll({ s -> s.gradYear == 2010 }). collect({ s -> s.score }). max() ֤छ಺෦ΠςϨʔγϣϯදه΋ؚΊͯɺศ རͳίϨΫγϣϯૢ࡞΋΋ͪΖΜ׬උ
13. USZXJUI SFTPVSDFT
14. +BWBҎલ
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    VHMZGJOBMMZDMPTJOH InputStream in = null; OutputStream out = null; try { in = new FileInputStream(“src”); out = new FileOutputStream(“dst”); byte[] buf = new byte[8192]; int n = 0; while((n = in.read(buf)) >= 0) { out.write(buf, 0, n); } } catch (IOException e) { // ྫ֎ॲཧ } finally { if (in != null) { try { in.close(); } catch (IOException e) { } } if (out != null) { try { out.close(); } catch (IOException e) { } } }
15. +BWB
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    USZXJUISFTPVSDFT try (InputStream in = new FileInputStream(“src”); OutputStream out = new FileOutputStream(“dst”)) { byte[] buf = new byte[8192]; int n = 0; while((n = in.read(buf)) >= 0) { out.write(buf, 0, n); } }
16. (SPPWZ
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -PBO
    1BUUFSO new File(“dest”).withOutputStream { out -> new File(“src”).withInputStream { ins -> byte[] buf = new byte[8192] int n = 0 while((n = ins.read(buf)) >= 0) { out.write(buf, 0, n); } } } new File("dest") << new File("src").bytes 㾎όοϑΝϦϯά͕ෆཁͳΒʢࢀߟʣ
17. %JBNPOE
18. +BWB
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    %JBNPOE ʙ+BWB Map<String, Map<String, List<Employee>>> map = new HashMap<String, Map<String, List<Employee>>>(); +BWB Map<String, Map<String, List<Employee>>> map = new HashMap<>();
19. (SPPWZ
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    δΣωϦΫεͷܕࢦఆͳΜͯͨͩͷ০ΓͰ͢ ŝžŕ Map<String, Map<String, List<Employee>>> map = [:] map.put(1, “A”) // ʮ͑ͬʁʯ map.put(“HOGE”, new Date()) // ʮ͑ͬʁʯ
20. 'PSL+PJO 'SBNXPSL
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    'PSL+PJO
    'SBNFXPSL import java.util.concurrent.*; public class Fibonacci extends RecursiveTask<Integer> { final int n; public Fibonacci(int n) { this.n = n; } public Integer compute() { if (n <= 1) return n; Fibonacci f1 = new Fibonacci(n - 1); f1.fork(); Fibonacci f2 = new Fibonacci(n - 2); return f2.compute() + f1.join(); } }
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    (1BST import static groovyx.gpars.GParsPool.* def fibo(num) { withPool { runForkJoin(num) { n -> switch (n) { case 0..1: return n default: forkOffChild(n - 1) forkOffChild(n - 2) childrenResults.sum() } } } } assert fibo(10) == 55 assert fibo(20) == 6765 㾎 ଞʹ΋ˣʹରԠ 㾎 1BSBMMFM"SSBZ 㾎 .BQ3FEVDF 㾎 4DBMBͷ"DUPS 㾎 $MPKVSFͷ"HFOU
23. +BWBͷډΔ৔ॴ ͸ɺطʹŠŠŠ
    (SPPWZ͕
    ˓೥લ ʹ௨աͨ͠৔ॴͩο
24. ͱɺἤͬͯॻ͍ͯΈ·ͨ͠ ͕ɺ+BWB͕͋ͬͯͦ͜ͷ (SPPWZ
    ͳͷͰɺࠓޙͱ ΋ԿଔΑΖ͓͘͠ئ͍͍ ͨ͠·͢ɻ͍΍ϚδͰɻ