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Raspberry Pi ãƒ¡ãƒ¢ (37) Java8 ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°
Luajit ã§ ffi ã‚’ä½¿ã£ãŸå ´åˆã‚ˆã‚Šå°‘ã—é…ããªã‚Šã¾ã™ãŒã€Python ã‚ˆã‚Šåœ§å€’çš„ã«é«˜é€Ÿã§ã™ã€‚ Raspberry Pi ã§ãƒ‡ã‚¹ã‚¯ãƒˆãƒƒãƒ—ç”¨ã®ã‚¢ãƒ—ãƒªã‚’ã¤ãã‚ã†ã¨ã™ã‚‹ã¨ Python + PyGTK ã¨ Java8 + Swing ãŒæœ‰åŠ›ã§ã™ãŒã€é€Ÿåº¦ã‚’è€ƒãˆã‚‹ã¨ Java8 + Swing ã§ã™ãã€‚ Android ã®ã‚¢ãƒ—ãƒªã‚’ä½œã‚‹ç·´ç¿’ã«ã‚‚ãªã‚Šã¾ã™ã€‚ java ã®ã‚³ãƒ¼ãƒ‰ æ¬¡ã®ã‚³ãƒ¼ãƒ‰ã‚’ã€ŒmulMatrix.javaã€ã¨ã„ã†ãƒ•ã‚¡ã‚¤ãƒ«åã§ä¿å˜ã—ã¦ã€ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³ã‹ã‚‰ã€Œjavac mulMatrix.javaã€ã§ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã—ã¦ mulMatrix.class ã‚’ä½œã‚Šã€ãã® mulMatrix.class ã‚’ ã€Œjava mulMatrixã€ã§å®Ÿè¡Œã—ã¾ã™ã€‚ java ã‚³ãƒžãƒ³ãƒ‰ã¯ã‚¯ãƒ©ã‚¹åã‚’å¼•æ•°ã§ä¸Žãˆã¾ã™ãŒã€ ã‚¯ãƒ©ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«å(mulMatrix.class) ã§ã¯ãªã„ã“ã¨ã«æ³¨æ„ã—ã¦ä¸‹ã•ã„ã€‚ $ javac
tokuryoo 2015/12/24
ã“ã‚Œã ã‘é€Ÿã„ãªã‚‰scaleway(4ã‚³ã‚¢ARM)ã¯å®‰ãã¦é€Ÿãã†ã€‚JavaãŒARMã®hard floatã«å¯¾å¿œã—ã¦ã‚‹ãªã‚“ã¦çŸ¥ã‚‰ãªã‹ã£ãŸã€‚é…åˆ—ã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã«ã‚ˆã‚‹å‚ç…§ã¯æ¸›ã‚‰ã—ãŸã»ã†ãŒé€Ÿã„ã“ã¨ã‚‚ã‚ã‚‹ã‚‰ã—ã„ã€‚

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ã•ã¦ã€Java8ã§é–¢æ•°åž‹ã£ã½ã„ã“ã¨ã‚’ã‚„ã£ã¦éŠã‚“ã§ã¿ãŸã‚ã‘ã§ã™ãŒã€å®Ÿéš›ã¯ãã‚“ãªæ›¸ãæ–¹ã—ã¾ã›ã‚“ã‚ˆãã€‚ Java8ã§å®Ÿéš›ã«ä½¿ã†ã®ã¯ã€Streamã§ã™ã€‚ ã¨ã„ã†ã“ã¨ã§ã€Streamã®ä½¿ã„æ–¹ã‚’ã²ã¨ã¨ãŠã‚Šè¦‹ã¦ã¿ã¾ã™ã€‚ â€»5/17 ä»•æ§˜å¤‰æ›´ãŒã‚ã£ãŸã®ã§ã€ä¿®æ£ã—ã¾ã—ãŸ åŸºæœ¬ ã¾ãšã¯ã€Iterableã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã«ç”¨æ„ã•ã‚ŒãŸforEachãƒ¡ã‚½ãƒƒãƒ‰ã‚’è¦‹ã¦ã¿ã¾ã—ã‚‡ã†ã€‚ List<String> names = Arrays.asList("hoge hoge", "foo bar", "naoki", "kishida"); names.forEach(s -> System.out.println(s)); ã“ã‚Œã§æ¬¡ã®ã‚ˆã†ã«è¡¨ç¤ºã•ã‚Œã¾ã™ã€‚ hoge hoge foo bar naoki kishida ã„ã¾ã¾ã§ã®æ‹¡å¼µforã ã¨æ¬¡ã®ã‚ˆã†ã«æ›¸ã„ã¦ã¾ã—ãŸ List<String> names = Arrays.a
tokuryoo 2015/12/22
java8

stream

lambda
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Java Streamã‚µãƒ³ãƒ—ãƒ«(Hishidama's Java8 Stream Example)
Streamã‚’å¤‰æ›ã™ã‚‹ä¾‹ Streamã‚’Listã«å¤‰æ›ã™ã‚‹ã«ã¯Collectors.toList()ã‚’ä½¿ã†ã®ãŒå¸¸å¥—æ‰‹æ®µã ãŒã€forEachã§æ›¸ãã¨ä»¥ä¸‹ã®ã‚ˆã†ã«ãªã‚‹ã€‚ import java.util.ArrayList; import java.util.List; import java.util.stream.Stream; Stream<String> stream = Stream.of("abc", "def"); // List<String> list = stream.collect(Collectors.toList()); List<String> list = new ArrayList<>(); stream.forEach(t -> list.add(t)); System.out.println(list); â†’collectãƒ¡ã‚½ãƒƒãƒ‰ã®å¼•æ•°ã‚’è‡ªä½œã—ã¦Listã¸å¤‰
tokuryoo 2015/12/22
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tokuryoo 2015/12/22
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Amazon.co.jp: ç¾å ´ã§ä½¿ãˆã‚‹[æœ€æ–°]Java SE 7/8 é€Ÿæ”»å…¥é–€: æ«»åºç¥ä¸€: æœ¬
tokuryoo 2015/12/09
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java8
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tokuryoo 2015/10/22
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Stream APIã®ä¸»ãªãƒ¡ã‚½ãƒƒãƒ‰ã¨å‡¦ç†çµæžœã®Optionalã‚¯ãƒ©ã‚¹ã®ä½¿ã„æ–¹
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tokuryoo 2015/10/22
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tokuryoo 2015/10/22
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tokuryoo 2015/01/21
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tokuryoo 2014/11/11
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JavaOne 2014 ã‚µãƒ³ãƒ•ãƒ©ãƒ³ã‚·ã‚¹ã‚³4æ—¥ç›® - ãã—ã ã®Hatena
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tokuryoo 2014/11/05
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tokuryoo 2014/11/05
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tokuryoo 2014/10/22
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java8
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Java 8ã®äºˆç¿’ã¯ãŠæ¸ˆã¿ã§ã™ã‹ï¼Ÿ - DENã®æ€ã†ã“ã¨
ã¨ã†ã¨ã†3/18ã®Java SE 8ã®ãƒªãƒªãƒ¼ã‚¹ãŒè¿‘ã¥ã„ã¦ãã¾ã—ãŸã€‚ åŽ»å¹´ã‚ãŸã‚Šã‹ã‚‰Javaç•Œéšˆã§ã¯ãƒ©ãƒ ãƒ€å¼ãªã©ã‚’ä¸å¿ƒã¨ã—ã¦Java SE 8ã®æƒ…å ±ãŒå‡ºå›žã£ã¦ã„ã¾ã™ãŒã€å®Ÿéš›ã«ã¯ã¾ã è§¦ã£ã¦ãªã„äººã‚‚å¤šã„ã®ã§ã¯ãªã„ã§ã—ã‚‡ã†ã‹ã€‚ å°‘ã—ã§ã‚‚æ…£ã‚Œã¦ãŠãç‚ºã«ãã‚ãã‚æº–å‚™é‹å‹•ã§ã‚‚ã—ã¦ãŠã„ãŸæ–¹ãŒè‰¯ã„ã‹ãªã¨æ€ã„ã¾ã™ã€‚ æ£å¼ç‰ˆã§ã¯ã‚ã‚Šã¾ã›ã‚“ãŒEarly Accessç‰ˆãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¦ã„ã‚‹ã®ã§æ—¢ã«ãŠè©¦ã—ã§è§¦ã£ã¦ã¿ã‚‹äº‹ãŒã§ãã¾ã™ã€‚ JDK8 Early Access Releases https://jdk8.java.net/download.html IDEã‚‚å¯¾å¿œã¯é€²ã‚“ã§ã„ã‚‹ã‚ˆã†ãªã®ã§ãƒªãƒªãƒ¼ã‚¹å‰ã«ã‚‚ã‹ã‹ã‚ã‚‰ãšå®Ÿéš›ã«è©¦ã™ç’°å¢ƒã¯ç°¡å˜ã«ä½œã‚Œã¾ã™ãã€‚åœ°å‘³ã«ã™ã”ã„ã“ã¨ã ã¨æ€ã„ã¾ã™ã€‚ ã§ã¯ã€ã“ã®è¾ºã‚Šè§¦ã£ã¦ãŠã„ãŸæ–¹ãŒã„ã„ã‚ˆã£ã¦ã¨ã“ã‚ã‚’ã‚ã’ã¦ã¿ã¾ã™ã€‚ ãƒ»ãƒ©ãƒ ãƒ€å¼ ã¾ã‚çš†ã•ã‚“ä¸€ç•ªè§¦ã£ã¦ã¿ãŸã„ã®ãŒãƒ©ãƒ ãƒ€å¼ã§ã—ã‚‡ã†ã€‚ åž‹ãŒçœç•¥å‡ºæ¥ã‚‹è¾º
tokuryoo 2014/03/04
java8
ãƒªãƒ³ã‚¯
Stream APIã®å§‹ã‚æ–¹
ã“ã®è¨˜äº‹ã¯ã€Java Advent Calendar 2013ã®2æ—¥ç›®ã¨ã—ã¦æ›¸ã‹ã‚ŒãŸã‚‚ã®ã§ã™ã€‚ Java SE 8ã§ã¯ã€Stream APIã¨ã„ã†æ–°ã—ã„APIãŒå°Žå…¥ã•ã‚Œã¾ã™ã€‚Stream APIã¯ã€ä½•ã‚‰ã‹ã®è¦ç´ ã®é›†ã¾ã‚Šï¼ˆé…åˆ—ã‚„ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ã€ã‚ã‚‹ã„ã¯ãƒ†ã‚ã‚¹ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚’èªã¿å–ã‚‹ã¨ãã®ä¸€è¡Œä¸€è¡Œãªã©ï¼‰ã«å¯¾ã™ã‚‹ã•ã¾ã–ã¾ãªæ“ä½œã‚’æŠ½è±¡åŒ–ã—ãŸã€ã¨ã¦ã‚‚ä¾¿åˆ©ãªAPIã§ã™ã€‚ Stream APIã¯ã€Java SE 8ã®æ–°æ©Ÿèƒ½ã¨ã—ã¦ã‚‚ç‰¹ã«æ³¨ç›®ã•ã‚Œã¦ã„ã‚‹ã‚‚ã®ã®1ã¤ã§ã—ã‚‡ã†ã€‚é¡žä¼¼ã®ä»•çµ„ã¿ãŒC#ã‚„Scalaã‚„Rubyãªã©ä»–ã®è¨€èªžã§ã‚‚åºƒãŒã£ã¦ãŠã‚Šã€Javaã«ã‚‚ã¤ã„ã«ã€ã¨å¾…ã¡æœ›ã‚“ã§ã„ã‚‹æ–¹ã‚‚å¤šã„ã§ã—ã‚‡ã†ã€‚ ã¨ã“ã‚ãŒã€Streamã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ãŒæŒã¤æ§˜ã€…ãªä¾¿åˆ©ãƒ¡ã‚½ãƒƒãƒ‰ï¼ˆfilterã€mapã€flatMapã€collectãªã©ï¼‰ã¯ã€ã‚ã¡ã“ã¡ã§ã‚ˆãç´¹ä»‹ã•ã‚Œã‚‹ä¸€æ–¹ã§ã€æ¬¡ã®2ç‚¹ã¯ã€ã‚ã¾ã‚Šæ³¨ç›®ã•ã‚Œã¦ã„ãªã„ã‚ˆã†ã«æ€ã„ã¾ã—ãŸï¼ˆã¼ããŒè¦‹ãŸé™
tokuryoo 2013/12/03
java8

java
ãƒªãƒ³ã‚¯
Java 8 vs Scala: ç‰¹å¾´ã‚’æ¯”è¼ƒã™ã‚‹
Java 8ã¯ã¤ã„ã«ãƒ©ãƒ ãƒ€å¼ã‚’å°Žå…¥ã—ã¾ã™ã€‚ãƒ©ãƒ ãƒ€å¼è‡ªä½“ã¯2009å¹´ã‹ã‚‰Project Lambdaã§åˆ©ç”¨ã™ã‚‹ã“ã¨ãŒã§ãã¾ã—ãŸã€‚å½“æ™‚ã¯ãƒ©ãƒ ãƒ€å¼ã¯Java Closuresã¨è¨€ã‚ã‚Œã¦ã„ã¾ã—ãŸã€‚ã‚µãƒ³ãƒ—ãƒ«ã‚³ãƒ¼ãƒ‰ã‚’ç´¹ä»‹ã™ã‚‹å‰ã«ã€ãƒ©ãƒ ãƒ€å¼ãŒJavaãƒ—ãƒã‚°ãƒ©ãƒžã«ã¨ã£ã¦ãªãœæ“è¿Žã™ã¹ãæ©Ÿèƒ½ãªã®ã‹ã‚’èª¬æ˜Žã—ã¾ã—ã‚‡ã†ã€‚ ãªãœãƒ©ãƒ ãƒ€å¼ã‚’ä½¿ã†ã®ã‹ ãƒ©ãƒ ãƒ€å¼ã®ä¸€èˆ¬çš„ãªä½¿ã„æ–¹ã¯GUIé–‹ç™ºã«ãŠã„ã¦ã§ã™ã€‚ä¸€èˆ¬çš„ã«ã€GUIãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã§ã¯ã‚¤ãƒ™ãƒ³ãƒˆã¨çµã³ã¤ãæŒ¯ã‚‹èˆžã„ã‚’è§£æ±ºã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ä¾‹ãˆã°ã€ãƒ¦ãƒ¼ã‚¶ãŒãƒœã‚¿ãƒ³ã‚’æŠ¼ã—ãŸã¨ã(ã‚¤ãƒ™ãƒ³ãƒˆãŒç™ºç”Ÿã—ãŸã¨ã), ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã¯ä½•ã‚‰ã‹ã®å‡¦ç†ã‚’å®Ÿè¡Œã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ä¾‹ãˆã°ã€Swingã§ã¯ã€æ¬¡ã®ã‚³ãƒ¼ãƒ‰ã§ç¤ºã™ã‚ˆã†ã«ActionListenersã‚’ä½¿ã„ã¾ã™ã€‚ class ButtonHandler implements ActionListener { public void actionP
tokuryoo 2013/05/24
lambda

Java8
ãƒªãƒ³ã‚¯
Java8ã§å¼·åŒ–ã•ã‚ŒãŸMapã¨ã€æ›¸ãã‚„ã™ããªã£ãŸãƒ¡ãƒ¢åŒ–å†å¸° - ãã—ã ã®Hatena
Java8ã®lambdaæ§‹æ–‡ã®è©±ã‚’æ›¸ãã¨ã€æ—§æ¥ã®æ›¸ãæ–¹ã§ã„ã„ã¨ã„ã†ã‚³ãƒ¡ãƒ³ãƒˆãŒã¤ãã®ã§ã™ãŒã€ãã‚Œã§ã‚‚ä¾¿åˆ©ã«ãªã£ãŸMapã®æ©æµã‚’å—ã‘ã‚‹ã“ã¨ã¯å¤šã„ã‚“ã˜ã‚ƒãªã„ã‹ã¨æ€ã„ã¾ã™ã€‚ â€» 2018/5/31 Java9ã‹ã‚‰ã¯ãƒ¡ãƒ¢åŒ–å†å¸°ã«ã¯ä½¿ãˆãªããªã£ã¦ã„ã¾ã™ â€» 2019/2/15 ãªã‚“ã‹å•é¡Œãªã„ï¼Ÿ Mapã«ã¯ã€lambdaå¼ã‚’ä½¿ã£ãŸãƒ¡ã‚½ãƒƒãƒ‰ãŒå¤šãè¿½åŠ ã•ã‚Œã¦ã„ã¾ã™ãŒã€ãŸã¨ãˆã°getOrDefaultãƒ¡ã‚½ãƒƒãƒ‰ã®ã‚ˆã†ãªlambdaå¼ã‚’ä½¿ã‚ãªã„ãƒ¡ã‚½ãƒƒãƒ‰ã‚‚è¿½åŠ ã•ã‚Œã¦ã„ã¦ã€ã“ã‚Œã‚‚ä¾¿åˆ©ã§ã™ã€‚ ãã—ã¦ã€ã“ã®ã‚ˆã†ãªlambdaå¼ã‚’ä½¿ã‚ãªã„ãƒ¡ã‚½ãƒƒãƒ‰ã‚‚ã€é–“æŽ¥çš„ã«ã¯lambdaæ§‹æ–‡ã‚µãƒãƒ¼ãƒˆã§ã®è¨€èªžæ‹¡å¼µã®ãŠã‹ã’ã§ã™ã€‚ Mapã¯ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ãªã®ã§ã€Java7ã¾ã§ã®æ§‹æ–‡ã§ãƒ¡ã‚½ãƒƒãƒ‰ã‚’è¿½åŠ ã—ã‚ˆã†ã¨ã™ã‚‹ã¨ã€Mapã‚’å®Ÿè£…ã—ã¦ã„ã‚‹ã™ã¹ã¦ã®ã‚¯ãƒ©ã‚¹ã«æ–°ã—ã„ãƒ¡ã‚½ãƒƒãƒ‰ã®å®Ÿè£…ã‚’è¿½åŠ ã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã—ãŸã€‚ãã—ã¦ãã‚Œã¯ç¾å®Ÿçš„ã«ä¸å¯èƒ½ãªã®ã§ã€ä»Šã¾ã§Mapãªã©
tokuryoo 2013/05/24
java8

lambda
ãƒªãƒ³ã‚¯
1