Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article?
â»ãããã大åå¤ãã®ã§ Androidã§Java8ç°å¢ 2016 - visible true ã御覧ãã ããã ã¯ããã« RxAndroid(ã¨ãããRxJava)ã¨Retrolambdaã§ãããã大ä½Java8ãªç°å¢ã§Androidã¢ããªã±ã¼ã·ã§ã³ãéçºåºæ¥ãã®ã§ã¯ãªããã¨èãã¦è©¦ãã¦ã¿ãã 2014å¹´4æé ã®Retrolambdaã¯ã¾ã 1.1.4ã¨ãã§lambdaããã¾ãç¨åº¦ã«ä½¿ããç¨åº¦ã§ããã¼æ¯ãã£ã¦æããã¯ãã¯ããã¨ããäºã§ã¹ã«ã¼ãã¦ãããã ãã©ãæè¿ä¹ ãã¶ãã«è¦ããã1.8.0ã¾ã§è²ã£ã¦ãã¦Try-with-resources*1ãMethod referencesããµãã¼ãããã¦ããã ã¾ããRxJavaã¯1.0.0ã11æã«ãªãªã¼ã¹ããã¦å®ç¨æ®µéã«å ¥ã£ã¦ãã¦ãããJava8ã®Stream APIãæ¦ãè£å®ããæ§ãªæ©è½ãæã£ã¦ããã æ´ã«Androidã§RxJavaãæ±ããã
æå¹ã¯å¤§èããã®äºæ³ã ã£ãã®ã§ãããä»ã®ã¨ãã大å¤ç©ãããªå¤©åã§ããããã«ã¡ã¯ããããã§ãã ãã®è¨äºã¯Java Advent Calendar 2014ã®17æ¥ç®ã«ãªãã¾ãã æ¨æ¥16æ¥ã¯@zephiransasããã®ãLambda-behaveã§ãã¹ããæ¸ãããã§ããã Java8ã®ç´ æ´ãããä¸ç Java8ã使ã£ã¦ããã°ã©ãã³ã°ãã¦ããã¨ãæ°ããæ©è½ãè²ã ã¨ä½¿ããã¨ã§ç°¡æ½ã§èªã¿ãããã³ã¼ããè¨è¿°ãããã¨ãåºæ¥ã¾ãããããæãã®å¤æ¥½ããããããæ°åã§ã³ã¼ããæ¸ããã¨ãåºæ¥ã¾ããä»ã¾ã§ã®ããã«åããã¡ãã¡æ¸ããªããã¨ããã¹ãå°çã¿ãããªã¨ããããå°ãã ããã§ã大èã«æ¹åãããã¨ãåºæ¥ãä¹ ã ã«Javaã§ã³ã¼ããæ¸ãã¦ãã¦æ¥½ããã¨æã£ãæéã§ãããAndroidã¯Javaã§ã¯ï½ï¼ï½ï½ ç¹ã«ããæ°ã¶æãPlay for Javaã§Java8ãå©ç¨ããéçºããã¦ããã®ã§ããããã®ä¸ã§Stream
LL ãã Java ã«ç§»è¡ãã人ãã¯ã¾ããã¡ãªã㨠ããã«ã¡ã¯ï½¡Java åå¿è ã§ã。 Java åå¿è 、å¾ã« LL ãã Java ã«æ¥ã人ã«ãããã¡ãªåé¡ã«ã¤ãã¦ç¤¾å åãã«æ¸ãããã®ããªã¼ãã³ã¢ã³ãã·ã§ã¢ããã¦ããã ãã¾ã。 åæã¨ãã¦ï½¤æã 㯠Java 8 ã§ã¬ã³ã¬ã³æ»ãã¦ããã¨ãããã¨ããæ¿ç¥ãããã ãã。 ã¾ã、èªåããã®æ°ã¶æã§ï½¢ããã¼ï½¡ãããã¨ãã¹ãã ã£ãã®ãã¼ï½£ã¨æ°ã¥ãããã¤ããã¤é¡ã§èªã£ã¦ããã¨ãããã¨ã«ããæ³¨æãã ãã。 ã追è¨ã 対象ã¯ä¸è¦æ¨¡ B2C ã®å ´åã§ã(ä¸è¦æ¨¡ã¨ããã®ã¯ facebook ããå°ããã¨ããç¨åº¦ã®æå³ã§ã) ä¾å¤ãæ¡ãã¤ã¶ããªãããã«ããã Eclipse ãçæãã以ä¸ã®ãããªã³ã¼ãããã®ã¾ã¾æ®ãã¦ããã±ã¼ã¹ï½¡ ããã¯è¨ãã¾ã§ããªãè¯ããªãã§ãã。ãããã°ãå°é£ã«ãªãã¾ã。 try { } catch (IOException e) { e
â» ãµã³ãã«ãJDK7ã¾ã§ã¨JDK8ã¾ã§ã§æå³ãå¤ãã£ã¦ãã¦ãããã«ããã¨ããææããã£ãã®ã§ãå°ãç´ãã¾ããã â» boxedãä½¿ãæ¸ãæ¹ã ã¨ç¡é§ãªAutoboxingãèµ°ãã¨ã®ææãé ãã¾ããã®ã§mapToObjãå©ç¨ããããã«å¤ãã¾ããã Java8ã®ç®çæ©è½ã®ä¸ã¤ã«Stream APIãããã¾ãã ç®çæ©è½ã ããã£ã¦ãå æ¥ã®Java Day Tokyo 2014ãå«ãã¦è²ããªæã§çºè¡¨ãããã°ã®è¨äºãå ¬éããã¦ããã®ã§ãã©ããªãã®ããç¥ã£ã¦ã人ã¯å¤ãã¨æãã¾ãã Stream APIã¨ããã°ã".parallel()"ã¨æ¸ãã ãã§ä¸¦ååãã¦ã¹ãã¼ãã¢ããåºæ¥ãï¼ãã¨ããé æçãªãã¼ã¯ã¼ãã§ç´¹ä»ããããã¨ãå¤ãã®ã§ã並ååã®ããã®ä»æ§ã ã¨åéãããããã§ãããããã§ã¯ããã¾ããã â» ãã¡ãããããã£ãè¨äºã®ä¸ãã¡ããã¨èªãã°ããåç´ãªè©±ãããªããã¨ãåããã¾ãã ãããã並ååã«é¢ã
ãããããªæååé£çµã®ã³ã¼ããæ¸ãã人ãããã®ã§ã¾ã¨ãã¦ããã¾ããã 主ã«å¤æ ããã ã¨ãããããåºæºã¨ãã¦ãã¡ã¢ãªç¢ºä¿ããStringBuilderç public static String stringBuilderJoinMem(){ StringBuilder s = new StringBuilder(9100).append("["); for(int i = 0; i < strarray.length; ++i){ if(i != 0){ s.append("],["); } s.append(strarray[i]); } s.append("]"); return s.toString(); } 1037ms ã¨ãããã¨ã§ãã¾ãã¯backpaper0ãããæ¯è¼ç常人ã®ã³ã¼ãã https://gist.github.com/backpaper0/10273558 pu
ããã«ã¡ã¯ï¼ ã¢ããã§ãã ï¼ï¼ï¼T3ããã°ã¯åç»å ´ããããã¾ããããã¸ã¡ãã·ãã 以å¾ãè¦ç¥ããããã ããããã2014å¹´3æãJava8ãæ£å¼å ¬éããã¾ããã ãªãã¨è¨ã£ã¦ããJava8ã®æ³¨ç®æ©è½ã¯ã©ã ãå¼ã§ãã®ã§ãã©ã ãå¼ã忍è«ã«é¢ããè¨äºã¯å¤ãã§ãã ä¸ã®ä¸ã§ãJava8ãã¨æ¤ç´¢ããã¨ãçããããããã¨è¨äºãæ¸ããã¦ããã®ã§ãããããã®äºã¯ããã§åãã£ã¡ãããããªæ°ããã¾ãã ãã å®ã¯å°å³ã«ä¾¿å©ãªAPIã追å ããã¦ããããããã¨ãæè¿ç¥ãã¾ããã ããã¯ãã¾ã触ãããã¦ããªãããã¨ã ã¨ããããã§ããã®ã¨ã³ããªã§ã¯ããã¾ãæ¥æ¬èªã§æ å ±ã®ç¡ãããããå°å³ã«ä¾¿å©ãªAPIã«å®éã«è§¦ãã¦ã¿ã¾ãã 大äºãªã¨ãããªã®ã§ï¼å強調ãã¦æ¸ãã¦ã¿ã¾ããã ä»åã¯ãåç·¨ã¨ãã¦ï¼ã¤ç´¹ä»ãã¾ãã â»APIã®ç´¹ä»ã¨è¨ãã¤ã¤ãã³ã¼ãã«ã¯ã©ã ãå¼ã使ã£ãã³ã¼ããæ®éã«åºã¦ãã®ã§ããäºæ¿ãã ããã (ãããã
ãªãªã¼ã¹ãé害æ å ±ãªã©ã®ãµã¼ãã¹ã®ãç¥ãã
ææ°ã®äººæ°ã¨ã³ããªã¼ã®é ä¿¡
å¦çãå®è¡ä¸ã§ã
j次ã®ããã¯ãã¼ã¯
kåã®ããã¯ãã¼ã¯
lãã¨ã§èªã
eã³ã¡ã³ãä¸è¦§ãéã
oãã¼ã¸ãéã
{{#tags}}- {{label}}
{{/tags}}