Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article?

Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? Javaã®ãµãã¼ãã«ã¤ãã¦ã®ã¾ã¨ã Javaã®ã©ã¤ã»ã³ã¹ããµãã¼ãç¶æ³ã«ã¤ãã¦æ··ä¹±ãçºçãã¦ããããã«æãã¾ããJavaã®ãµãã¼ããåå£ä½ãã©ã®ããã«è¡ãªã£ã¦ããããã¾ã¨ãã¦ã¿ã¾ãã ç¥ã£ã¦ããã¦ã»ããã®ã¯ãJavaã®å®è£ ããµãã¼ãã¯Oracle JDKãOpenJDKã®äºæãã§ã¯ãªãAdoptOpenJDKãAzul ZuluãCorretteãªã©å¤ãã®é¸æè¢ãããã¨ãããã¨ã§ãã ããã§ãµãã¼ãã¯ãã°ãã»ãã¥ãªãã£ã«å¯¾å¿ãããããããªãªã¼ã¹ããããã¨ã表ãã¦ãã¾ãã Javaã®ãªãªã¼ã¹ãµã¤ã¯ã« ããã¾ã§ãJavaã¯3å¹´ãã¨ãç®æ¨ã«çµ
å ãã¿: åã«ã¨ã£ã¦Maybe / Nullable / Optional ããã©ããã¦ããã£ããããªãããã - äºå²¡çããã°ã©ãæ¥è¨ OOPã®æèã§è¦ãã¨ãå ã®è¨äºãè¨ã£ã¦ãããã¨ãããããªãã¯ãªãã®ã§ããã対象ãåºããã¦ããããã¨ä¸æ£ç¢ºã«ãªã£ã¦ãã¾ã£ã¦ããã®ã§ãã¡ãã£ã¨ã¾ã¨ãã¦ã¿ã¾ãã å ã®è¨äºã対象ã«ãã¦ããã®ã¯ãMaybe / Optional / Nullableã®3ã¤ã§ãã 対å¿ããåãæã¤è¨èªãè¦ã¦ã¿ãã¨ãä¸è¨ã®ããã«ãªãã¾ãã Maybe(Haskell) Optional(Swift/Java) Nullable(C#) ãããã¯ããå¤ããªããã¨ãã表ããã®ãã¨ããè¦æ¹ã§ã¯åãã§ãããããããç°ãªã価å¤è¦³ã®å ã«ä½ããã¦ãã¾ãã Maybe/Optionalã¨Nullable ãããã¯ãã¹ã¦åãã©ã¡ã¼ã¿ãåãã¾ã*1ã ãããããã®ä¸ã§Nullableã ãã¯åãã©ã¡ã¼ã¿ã«
Effective Java is considered by many, one of the most important books for writing Java code that is maintainable in the long run and efficient at the same time. Android is using Java and that means that all of the advice given in the book must be applicable, right? Not exactly. Some people consider that most of the advice given by the book are not applicable in the Android development world. In my
I have a problem with parsing a JSON response using Gson. JSON string: response: [ 2, { owner_id: 23972237, album_id: 25487692, title: 'album not new' }, { owner_id: 23972237, album_id: 25486631, title: 'ÑÑв' } ] I have these 2 classes: public class VkAudioAlbumsResponse { public ArrayList<VkAudioAlbum> response; public VkError error; } public class VkAudioAlbum { public int owner_id; public int a
ä¼å¡äºæ¥é¨ã®å±±ä¸(@tomorrowkey)ã§ãã RxJavaãæµè¡ã£ã¦ã¾ãããæè¿Androidçã¯ãã¯ãããã§ãRxJavaãå°å ¥ããã¾ããããã®è¨äºã¯ç§ãRxJavaã使ãã«ããã£ã¦æ¤è¨¼ç¨ã®ãã¹ãã³ã¼ããæ¸ãããã®ããã¼ã¹ã«ãRxJavaã®æåãã¿ãªããã«ç´¹ä»ãããã¨æãã¾ãã ç®æ¬¡ ãªã¹ãæä½ã§ããããããåºæ¬çãªRxJavaã®ä½¿ãæ¹ Observable Operator Observer / Subscribe å®è¡é åºã確èªãããµã³ãã«ããã°ã©ã 7ã¤ã®ãµã³ãã«ããã°ã©ã ãªã¹ãæä½ã§ããããããåºæ¬çãªRxJavaã®ä½¿ãæ¹ RxJavaã¯APIã¢ã¯ã»ã¹ãã¤ãã³ãããªã¬ã¼ããªã¹ãå¦çãªã©ãå¤å²ã«ãããå¦çã«ä½¿ããã¨ãã§ãã¾ãããã®ã¨ã³ããªã§ã¯åå¦è ã«ä¸çªåããããããªã¹ãã®å¦çãä¾ã«è§£èª¬ãã¾ãã ããã¯1ãã10ã¾ã§ã®å¤ã渡ããå¶æ°ã ãã«ãã£ã«ã¿ãªã³ã°ãããããå¤ã10åã«
ã¤ãã³ããã¹ Android ã§ã¯ãéåæå¦çã®è¿ãå¤ã¯ã³ã¼ã«ããã¯ã¤ã³ã¿ãã§ã¼ã¹ãä»ãã¦ããåããããã ãã以å¤ã«ããObserver ãã¿ã¼ã³ã«åºãã¦è¨è¨ããã¦ããã¯ã©ã¹ï¼SharedPreferencesãªã©ï¼ããActivity 㨠Fragment ã¨ã®ããã¨ããªã©ã§ããã³ã¼ã«ããã¯ã¤ã³ã¿ãã§ã¼ã¹ãå®ç¾©ãã¦ããã®å®è£ ã¨ã©ã¤ããµã¤ã¯ã«ç®¡çãããã ä¸æ¹ã§ãæ©è½ãå¢ããã¨ãã®åã³ã¼ã«ããã¯ã¤ã³ã¿ãã§ã¼ã¹ã®å®ç¾©ãå¢ããActivity ãå¹¾ã¤ãã®ã¤ã³ã¿ãã§ã¼ã¹ãå®è£ ãããã¨ããããã³ã¼ã«ããã¯ã¤ã³ã¿ãã§ã¼ã¹ã®å®ç¾©ãå¢ãã¦ããã¨ããã®åã ãä¾åé¢ä¿ãè¤éã«ãªãããããªã£ãããã³ã¼ã«ããã¯ãåãã¦æ´ã«éåæå¦çãå¼ã³åºãã¦â¦ã¨ãã¦ããã¨ãã©ãã©ããã¹ããæ·±ããªã£ãããã¦ãã(ã³ã¼ã«ããã¯å°ç)ã ããã§ãã³ã¼ã«ããã¯ã¡ã½ãããå¼ã¶ã¿ã¤ãã³ã°ã§ã¤ãã³ããçºç«ããã³ã¼ã«ããã¯ã¤ã³ã¿ãã§ã¼ã¹ã®
ãããã°ã©ãã®ããã®æåã³ã¼ãæè¡å ¥éããèªãã§ã Stringã®æåæ°ãã«ã¦ã³ãããæãString#length()ã¡ã½ããã§ã¯å³å¯ã«æåæ°ãã«ã¦ã³ãã§ããªãå ´åãããã¨ããã å®é¨ å®éã«ãã®ã±ã¼ã¹ã試ãã¦ã¿ãã æ¬æ¥5ã¨ã«ã¦ã³ããããã¨ãããã7ã¨ã«ã¦ã³ãããã¦ãã¾ã£ããããã¯ãæååã®ä¸ã«ãµãã²ã¼ããã¢ã«è©²å½ããæåãå«ã¾ãã¦ããããã§ãã(1æåç®ã¨ï¼æåç®)ãæåã®2æåã¯ãé½é½¬ã(ãã)ã§ã¯ãªãããé½é½¬ãã®ç°åä½ã§ããããµãã²ã¼ããã¢ã®å ´åã1ã¤ã®æåã«å¯¾ãï¼ã¤ã®charå¤ã対å¿ããããã§ã¯ãªãã2ã¤ã®charå¤ã対å¿ããå½¢ã«ãªããString#length()ã¯charã®æ°ãã«ã¦ã³ãããããããã®å ´åçµæã¯7ã¨ãªã£ã¦ãã¾ãã ããã§JDK1.5ãã追å ãããString#codePointCount()ã¡ã½ãããå©ç¨ãã¦ã«ã¦ã³ããã¦ã¿ããããã¯ãæåã®ç¬¦å·ä½ç½®ã®æ°ãã«ã¦ã³
Stay organized with collections Save and categorize content based on your preferences. What J2ObjC is J2ObjC is an open-source command-line tool from Google that translates Java source code to Objective-C for the iOS (iPhone/iPad) platform. This tool enables Java source to be part of an iOS application's build, as no editing of the generated files is necessary. The goal is to write an app's non-UI
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«ãã注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.printStackTrace(); } Perl
ã³ã¼ã«ããã¯ããã使ãã¾ãããã éåæå¦çã®çµæãåãåãã«ã¯ãå¿ ãã¨è¨ã£ã¦ããã»ã©ä»ãåããã¨ã«ãªãã³ã¼ã«ããã¯ã§ãããUI ã®ããã«ã©ã¤ããµã¤ã¯ã«ãæã¤ãªãã¸ã§ã¯ãã¨å ±åããã«ã¯ãèæ ®ãã¹ããã¨ãããã¤ãããã¾ãã ããã§ã¯ãããã¾ãã«ãä¸æã«ã³ã¼ã«ããã¯ã¨ä»ãåãæ¹æ³ãè¦ã¦ããã¾ãã åºæ¬ã¨ãªããã¤ã³ã ãªãã¨ãã£ã¦ãã¾ãæããªããã°ãããªããã¤ã³ãã¯ãã©ã¤ããµã¤ã¯ã«ãæã¤ãªãã¸ã§ã¯ãã¨ã®å ±åã§ããä¸ã«åºåã£ã¦ããæ§ã ãªã³ã¼ã«ããã¯ç®¡çã®ããã®ã©ã¤ãã©ãªã¯ããã®ã©ã¤ããµã¤ã¯ã«ãæã¤ãªãã¸ã§ã¯ãã¨ã®å ±åãããã«æ¥½ã«ããããã¯ç´æçã«ããããã¨ãããã¨ããã¨ã«ä½ããã¦ãã¾ãã ã©ã¤ããµã¤ã¯ã«ã¨ã¯ã¤ã¾ãããªãã¸ã§ã¯ããçæããã¦ããæ¶æ» ããã¾ã§ã®ä¸é£ã®æµãã®ãã¨ã§ãã newãããallocãããããã¿ã¤ãã³ã°ã§ãªãã¸ã§ã¯ããçæãããGC ã«ååããããdeallocãããããã¿ã¤ãã³
ç´ç²ã«ãªãã¸ã§ã¯ãæåçã«èããå ´åããªãã¸ã§ã¯ãéã®éä¿¡ã«nullã使ç¨ãããªãã¦ãã¨ã¯ãã£ã¦ã¯ãªããªãäºã ã ããå¤ãnullã§ããã¨ãããã¨ã¯ä½ãã®ç¶æ ã表ãã¦ããããã§ããã®ç¶æ ãnullã§è¡¨ãã¦ãã¾ãã¨äººéã®é ã«ã¨ã£ã¦ã¯æ±ãé£ãåå¨ã¨ãªãã ä¾ãã°ããªããã³ã¼ãã¼ã«ãããæã£ã¦ããã¨ãã¦ã³ã¼ãã¼ã«ãããnullã ã§ã¯æ³åã§è£ããã¨ã¯å¯è½ã§ãã£ã¦ãæå³ãéããªããç¶æ ãnullã§è¡¨ãã®ãæ¢ãã¦ã³ã¼ãã¼ã«ããã空ã ã¨è¨ãã°æ ¼æ®µã«ãããããããªãã ããã§éè¦ãªã®ã¯ååãã¤ãã¦ãããã©ããï¼ã¨ãããã¨ã ãååãä»ãããã¨ã«ãã£ã¦äººéã®é ã¯é«éã«å¦çã§ããããã«ãªããååãçç¥ãããã¨ããããç¶æ ããããã¨ãèªèãããã¨ãå°é£ã«ãªãã ãã®ãã¨ããnullã¯ã³ã³ãã¥ã¼ã¿ã®ã¡ã¢ãªã®ç¶æ ã表ãè¨èã§ãã£ã¦å®è£ ã§ããã¨ããããã¤ã¾ãnullã¯ã«ãã»ã«åã®å¯¾è±¡ã§ãã£ã¦ãã¤ã³ã¿ã¼ãã§ã¼ã¹éã§ããã¨
ã¯ããã« Android ããã°ã©ãã®ã¿ãªãããããã«ã¡ã¯ã ä»æ¥ãå æ°ã« Out Of Memory ãã¦ã¾ãã? ã¨ãããã¨ã§ããã®è¨äºã§ã¯æ¥ã OOM ã«æ©ã¾ããã Memory çãªæå³ã§å¯è±ªç㪠Android ããã°ã©ãã®çºã«ãEclipse Memory Analyzer Toolãé称 MAT ã®åºæ¬çãªä½¿ãæ¹ãç´¹ä»ãã¾ãã å°ããã®è¨äºã¯ [twitter:@youten] ãããä¼ç»ãããè£ Android Advent Calendar 12/20 ã®è¨äºã§ãããå 容çã«ã¯æ¯è¼çãªã¢ããªãã®ã«ãªã£ã¦ãã¾ãã 対象èªè Andoid ã¢ããªä½ã£ã¦ã/ã¯ããããã©ãã¾ã MAT ã使ã£ããã¨ããªãæ¹ MAT ã使ã£ã¦ã¿ããããäºã¯ãããã®ã®ãç»é¢ããé£ããããªé°å²æ°ãå¯ç¥ããèµ·å10ç§å¾ã«ã¯ãã£ã¨ã¿ããéãã¦ãã¾ã£ãçµé¨ãããæ¹ DDMS ã®åºæ¬çãªä½¿ãæ¹ãç解ãã¦ããæ¹
ã¦ããããã¹ããè¡ãã¨ãã«å°ãã®ã HttpServletRequestçã®ãµã¼ããªã©ã§çæãããã¤ã³ã¹ã¿ã³ã¹ã å¼æ°ã¨ãã¦ããã¡ã½ããã®ãã¹ãã§ãã ãããªã¨ãã¯ã¢ãã¯ã¨ããæ¬ä¼¼ãªãã¸ã§ã¯ãã å©ç¨ãããã¹ããè¡ãã®ãä¸è¬çã§ãã ç§ãJUnitã§ãã¹ããè¡ãçºã«ã¢ãã¯ã å©ç¨ãããã¨æã£ãã®ã§ããã æå©ç¨ãã¦ããmockobjectã¨ããã©ã¤ãã©ãªãç¡ããªã£ã¦ãã¾ãããï¼å¹´ãæãã¾ã;_;ï¼ ä»ã¯EasyMockãjMockã¨ãã£ãã©ã¤ãã©ãªãå©ç¨ããã¦ããããã§ãã ã¨ãããã¨ã§ä»åãEasyMockãåãã¦ä½¿ã£ã¦ã¿ã¾ããã以ä¸ã使ãæ¹ã§ãã http://www.easymock.org/index.html ï¼ãã¼ã¸ã§ã³ã¯2.4ã使ç¨ï¼ ã¾ãæåã«ãã¦ã³ãã¼ãããã easymock.jarãã¯ã©ã¹ãã¹ã«éãã¾ãã 次ã«ã import static org.easymock.
ãã£ãã«æè¡ã«ã¯ããããã¡ãæ¬ ããã¾ããã ãã®ãã¼ã¸ã§ã¯ããããã¡ã®åºç¤ã¨ãåºæ¬çãªä½¿ãæ¹ã«ã¤ãã¦è¨è¿°ãã¾ãã ãããã¡ã®æ¦è¦ ä¸è¬çãªé称ã¨ãã¦ã®ãããã¡ã¯ããã¼ã¿ãæºãã¦ããããã®ãã¼ã«ã®ãã¨ã§ãã é åã§ãã£ã¦ã(Cè¨èªã§ã¯)ãã¤ã³ã¿ã§ãã£ã¦ããããä¸å®éã®ãã¼ã¿ãæºãã¦ãããã¨ãã§ããé åã®ãã¨ãè¨ãã¾ãã java.nioã«ã¯ããã®é称ã¨ãã¦ã®ãããã¡ã§ã¯ãªãã¦ãã¯ã©ã¹ã¨ãã¦ã®Bufferãæä¾ããã¦ãã¾ãã ãã£ãã«ã§ä½¿ç¨ãããããã¡ã¨ã¯ããã®ãã¯ã©ã¹ã¨ãã¦ã®Bufferã§ãã java.nioã§æä¾ããã¦ãããããã¡ã¯ãå¯è½ã§ããã°ã JavaVMä¸ã®ã¡ã¢ãªã使ç¨ããã«ã ã·ã¹ãã ã»ãªã½ã¼ã¹ä¸ã®ã¡ã¢ãªãç´æ¥ä½¿ç¨ ãã¾ãã ããã«ãããããé«éã§ãã¼ã¿ã®æ ¼ç´ã¨åãåºããè¡ããã¨ãã§ããããã«è¨è¨ããã¦ãã¾ãã java.nioã«ã¯ãåããªããã£ãåãã¨ã«ãã¯ã©ã¹ãæä¾ããã¦ã
ã©ã³ãã³ã°
ãç¥ãã
ã©ã³ãã³ã°
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}}