Java 8 Strings: A Comprehensive Guide to Memory Efficiency
In the ever-evolving realm of Java programming, Java 8 has introduced remarkable enhancements, especially in the domain of strings. String manipulation, an elementary operation in any programming language, has witnessed a transformation with the introduction of new features and optimizations in Java 8. Among these innovations, string deduplication stands out as a technique aimed at improving both
String Deduplication - A new feature in Java 8 Update 20
Strings consume a lot of memory in any application. Especially the char[] containing the individual UTF-16 characters is contributing to most of the memory consumption of a JVM by each character eating up two bytes. It is not uncommon to find 30% of the memory consumed by Strings, because not only are Strings the best format to interact with humans, but also popular HTTP APIs use lots of Strings.
æ–‡å—列検索アルゴリズムã®è¦šãˆæ›¸ã - 我らãã¶ãŸé¦¬é¹¿
マイコミジャーナルã®é€£è¼‰è¨˜äº‹ã§ã€ã€ŒStringSearchã€ã¨ã„ã†æ–‡å—列検索ã®ãŸã‚ã®Javaライブラリを紹介ã—ã¾ã—ãŸã€‚ 攻略! ツール・ド・プãƒã‚°ãƒ©ãƒŸãƒ³ã‚° (44) 高速ãªæ–‡å—列検索を実ç¾ã™ã‚‹Javaライブラリ「StringSearch〠| マイナビニュース ãã®è£œè¶³ã‚‚å…¼ãã¦ã€è¨˜äº‹ä¸ã«å‡ºã¦ãã‚‹æ–‡å—列検索アルゴリズムã«ã¤ã„ã¦å°‘ã—ã¾ã¨ã‚ã¦ã¿ã¾ã—ãŸã€‚細部をçœç•¥ã—ãŸå¤§é›‘把ãªèª¬æ˜Žãªã®ã§åŽ³å¯†ãªè§£èª¬ã§ã¯ã‚ã‚Šã¾ã›ã‚“ãŒã€å‚考ã¾ã§ã«ã€‚ naiveアルゴリズム対象ã®æ–‡å—列ã¨ãƒ‘ターン文å—列を先é ã‹ã‚‰é †ç•ªã«æ¯”ã¹ã¦ã„ãã€ãƒžãƒƒãƒã—ãªã‹ã£ãŸã‚‰1æ–‡å—進ã‚ã¦ã¾ãŸæœ€åˆã‹ã‚‰æ¯”ã¹ã‚‹ã¨ã„ã†æ‰‹æ³•ã§ã™ã€‚ java.lang.Stringã®indexOf()メソッドãªã©ã¯ã“ã®å®Ÿè£…ã ãã†ã§ã™ã€‚ Knuth Morris Pattアルゴリズム（KMPアルゴリズム） マッãƒã«å¤±æ•—ã—ãŸå ´åˆã«ã€æ¯”較ã™ã‚‹ã‚¹ã‚¿ãƒ¼ãƒˆä½ç½®ã‚’1æ–‡å—ãšã¤é€²ã‚ã‚‹ã§ã¯ãªãã€ä½•
攻略! ツール・ド・プãƒã‚°ãƒ©ãƒŸãƒ³ã‚° (44) 高速ãªæ–‡å—列検索を実ç¾ã™ã‚‹Javaライブラリ「StringSearch〠| マイナビニュース
å„種文å—列検索アルゴリズムを実装ã—ãŸStringSearch Johann Burkardæ°ãŒå…¬é–‹ã—ã¦ã„ã‚‹StringSearchã¯ã€é«˜é€Ÿãªæ–‡å—列検索アルゴリズムを実装ã—ãŸJava用ライブラリã§ã‚る。BNDM法やã€BMH法ã¨ãã®æ´¾ç”Ÿã€Bit-parallel手法ã¨ã„ã£ãŸè¤‡æ•°ã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ をサãƒãƒ¼ãƒˆã—ã¦ã„る点ãŒç‰¹å¾´ã€‚ã„ãšã‚Œã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ を利用ã™ã‚‹å ´åˆã§ã‚‚基本的ãªä½¿ã„æ–¹ã¯å…±é€šã—ã¦ã„ã‚‹ãŸã‚ã€ç”¨é€”ã«ã‚ˆã£ã¦ç°¡å˜ã«ä½¿ã„分ã‘ã‚‹ã“ã¨ãŒã§ãる。 Burkardæ°ã«ã‚ˆã‚Œã°ã€StringSearchを利用ã™ã‚Œã°java.lang.Stringクラスã«ã‚ˆã‚‹æ–‡å—列検索ã«æ¯”ã¹ã¦5å€ã‹ã‚‰10å€ç¨‹åº¦ã®é«˜é€ŸåŒ–ãŒå¯èƒ½ã¨ã®ã“ã¨ã§ã‚る。ãŸã ã—ã€ã“ã®ä¸»å¼µã«ã¯ç•°è«–も出ã¦ã„る。ã¾ãŸã€String.indexOf()メソッドãªã©ã§æŽ¡ç”¨ã•ã‚Œã¦ã„ã‚‹ã¨ã„ã†naiveアルゴリズム(シンプルã ãŒä½Žé€Ÿ)ã«ã—ã¦ã‚‚ã€çŸã„æ–‡å—列を対象ã¨ã—ãŸæ¤œç´¢ã§ã‚ã‚Œã°å
ãã—ã ã•ã‚“ã®æ–‡å—列連çµã®ã‚„ã¤ã‚’CharBufferã§ã‚„ã£ã¦ã¿ã‚‹ - AOEã®æ—¥è¨˜
多分色んãªäººãŒæ—¢ã«ã‚„ã£ã¦ã„ã¦ä½•ç•ªç…Žã˜ã«ãªã£ã¦ã„ã‚‹ã‹åˆ†ã‹ã‚Šã¾ã›ã‚“ãŒã€ãã—ã (id:nowokay / @kis) ã•ã‚“ã®ã€ŒStringBuilderを使ã£ãŸã‚¯ã‚½ã‚³ãƒ¼ãƒ‰ã¯ã©ã“ã¾ã§é…ã„ã‹ ã€ã€ŒJava8時代ã®æ–‡å—列連çµã¾ã¨ã‚ã€ã«ã¤ã„ã¦è‡ªåˆ†ã‚‚ã¡ã‚‡ã£ã¨éŠã‚“ã§ã¿ã¾ã—ãŸã€‚ ã¨ã„ã†ã®ã‚‚今日ã®æ˜¼é£¯æ™‚ã«ç¤¾å†…ã§ã‚‚ã“ã®è©±ãŒè©±é¡Œã«ãªã£ã¦ã€ãã“ã§å¼Šç¤¾ã®æŸãƒ¢ãƒ’カンより「性能é¢ã§ã‚»ãƒ³ã‚·ãƒ†ã‚£ãƒ–ãªå ´é¢ã§ String を使ã†ã“ã¨ã‚’考ãˆã‚‹ãªã€‚CharBuffer 使ãˆã€‚ã€ã¨ã®è¨€è‘‰ã‚’賜りã¾ã—ãŸã‹ã‚‰ã§ã™ã€‚ ã¨è¨€ã†ã‚ã‘ã§ä»¥ä¸‹ã®ã‚³ãƒ¼ãƒ‰ã‚’試ã—ã¦ã¿ã¾ã—ãŸã€‚ public static String charBufferJoin() { CharBuffer buffer = CharBuffer.allocate(7995); buffer.put('['); for (int i = 0; i < strarray.length; +
実ã¯Stringã¯ãƒ¡ãƒ¢ãƒªãƒªãƒ¼ã‚¯ã®åŽŸå› ã ã£ãŸ(※1.7.0_06未満) - R42日記
InfoQã‹ã‚‰ã€‚ http://www.infoq.com/news/2013/12/Oracle-Tunes-Java-String Stringã®ã‚ˆã†ãªåŸºæœ¬åž‹ã«å¤§ããªä»•æ§˜å¤‰æ›´ãŒå…¥ã‚‹ã“ã¨ã¯ç¨€ã§ã™ãŒã€ 1.7.0_06ã§ã‚¢ã‚°ãƒ¬ãƒƒã‚·ãƒ–ãªå¤‰æ›´ãŒå…¥ã£ãŸã‚‰ã—ã„ã§ã™ã€‚ 以下ã€é©å½“和訳。 In an ongoing effort to improve Java performance, Oracle has announced a change in the internal representation of strings in the String class as of Java 1.7.0_06. The change, removing two non-static fields from the underlying String implementation, was done to
The string type is broken - Musing Mortoray
My previous article, “We don’t need a string type“, caused a bit of stir. Though the feedback is mixed, there is a common theme of a string being a useful feature. After doing a bit more research I can determine only one thing: most current string types are broken! Many of us believe our strings are capable of more than what they actually do. We rely on their functionality without actually checkin
ãªãªã‚45°ã‹ã‚‰è¦‹ãŸJavaOne
2. 自己紹介 ã™ãˆãªãŒ ã‚„ã™ã¾ã• ï‚— 末永 ææ£ï¼ˆ@YaSuenag） ï‚— NTT OSSセンタ勤務 â—¦ Javaã®éšœå®³è§£æžã€Q&A対応 ï‚– åˆè¨€è‘‰ã¯ã€ŒJavaã„ã„åã ã‹ã‚‰ï¼ã€ ï‚– hs_errãƒã‚°ã‚„コアã®è§£æž ï‚– Javaã¨libcã€Linuxカーãƒãƒ«ã®é–“ã‚’è¡Œã£ãŸã‚Šæ¥ãŸã‚Šâ€¦ â—¦ ãŸã¾ï½žã«OpenJDKã®ãƒ‘ッãƒæ›¸ã„ã¦ã¾ã™ ï‚— æ ¹ã£ã‹ã‚‰ã®ã‚µãƒ³ãƒ‡ãƒ¼ãƒ—ãƒã‚°ãƒ©ãƒžãƒ¼ â—¦ Object Pascal (Delphi) 大好ã â—¦ Cã¨Javaも好ã â—¦ アセンブラもçµæ§‹å¥½ã ï‚— JavaOneæ´ï¼š2年（2010 & 2011） 3. JavaOneã§æ„Ÿã˜ãŸã“㨠 求ã‚られるスã‚ルã®2極化 (EE vs SE) â—¦ EE ï‚– ã¨ã‚Šã‚ãˆãšã€Œã‚¯ãƒ©ã‚¦ãƒ‰ã€ ï‚– ã¨ã«ã‹ã「ãƒãƒ¼ã‚¿ãƒ“リティã€ï¼ ï‚– EoD 対 â—¦ SE 極 ï‚– ã¨ã‚Šã‚ãˆãšã€Œä¸¦åˆ—化〠 マルãƒãƒªãƒ³ã‚¬ãƒ«ï¼ŸãªVMã®å®Ÿç¾ ï‚– VMã®ä½œã‚Šã‚„å‹•ãã‚’æ„è˜
Java 7 時代㮠String#split() 事情
Java 7 ã«ãªã£ã¦ String#split() ã®å®Ÿè£…ãŒå¤‰æ›´ã•ã‚ŒãŸã“ã¨ã«ä»Šæ›´ãªãŒã‚‰æ°—付ã„ãŸã®ã§ã€Pattern#split() ã‚„ Java 6 ã¨ã®æ€§èƒ½ã®æ¯”較をã—ã¦ã¿ãŸãƒ¡ãƒ¢ã§ã™ã€‚ Java 6 以å‰ã®æ–‡å—åˆ—åˆ†å‰²å‡¦ç† å¤ãã‹ã‚‰ Java を触ã£ã¦ã„るエンジニアã§ã‚ã‚Œã°ã¿ãªå½“然知ã£ã¦ã„ã‚‹ã“ã¨ã ã¨æ€ã„ã¾ã™ãŒã€ TSV ファイルを Java ã®ãƒ—ãƒã‚°ãƒ©ãƒ ã§èªã¿è¾¼ã‚“ã§å‡¦ç†ã‚’ã™ã‚‹ã¨ããªã©ã€ç‰¹å®šã®ãƒ‡ãƒªãƒŸã‚¿ã§åŒºåˆ‡ã‚‰ã‚ŒãŸæ–‡å—列を個々ã®è¦ç´ ã«åˆ†å‰²ã™ã‚‹ã¨ã㯠String#split() を利用ã›ãšã€äº‹å‰ã«ãƒ‡ãƒªãƒŸã‚¿ã«å¯¾ã™ã‚‹ java.util.regex.Pattern オブジェクトを生æˆã—ã¦ãŠãã€ãã®ã‚ªãƒ–ジェクトを使ã„回ã™å½¢ã§ Pattern#split() を利用ã—ãŸæ–¹ãŒå‡¦ç†åŠ¹çŽ‡ (処ç†æ™‚é–“) ãŒã‚ˆããªã‚Šã¾ã™ã€‚ ã“ã‚Œã¯ã€ String#split() ã®å®Ÿè£…ãŒå®Ÿè³ªçš„ã« Pattern.compile
List::FrontCode - naoyaã®ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼
先日 Array::Gap ã¨ã„ㆠVariable Byte Codes ã«ã‚ˆã‚‹æ•´åˆ—済ã¿æ•´æ•°ã®åœ§ç¸®ã®å®Ÿè£…を作りã¾ã—ãŸã€‚(id:naoya:20080906:1220685978) 今日㯠Front Coding を使ã£ãŸåŒã˜ã‚ˆã†ãªåœ§ç¸®ãƒªã‚¹ãƒˆã‚¯ãƒ©ã‚¹ã€List::FrontCode を作ã£ã¦ã¿ã¾ã—ãŸã€‚Front Coding ã¯è¾žæ›¸å¼é †ã«æ•´åˆ—済ã¿ã®æ–‡å—列リストãªã©ã‚’圧縮ã™ã‚‹æ‰‹æ³•ã§ã™ã€‚WEB+DB PRESS Vol.42 ã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ &ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã®è¨˜äº‹ã§ PFI ã®å²¡é‡ŽåŽŸã•ã‚“ã«ã‚ˆã‚‹è§£èª¬ãŒã‚ã£ãŸã®ã§ã€ãれをå‚考ã«å®Ÿè£…ã—ã¾ã—ãŸã€‚ Front Coding Front Coding 㯠http://www.hoge.jp http://www.hoge.jp/a.htm http://www.hoge.jp/index.htm http://www.fuga.com/ http://www.
Generate random string/characters in JavaScript
I want a 5 character string composed of characters picked randomly from the set [a-zA-Z0-9]. What's the best way to do this with JavaScript?
Javaæ–‡å—列メモ(Hishidama's Java String Memo)
一文å—：char [/2010-06-20] ä¸å¤‰ã®æ–‡å—列：String [/2023-09-24] å¯å¤‰ã®æ–‡å—列：StringBuffer/StringBuilder [/2023-09-24] StringWriter（PrintWriter）/PrintStream [/2009-02-14] StringJoiner [2014-03-19] コードãƒã‚¤ãƒ³ãƒˆã®ä¾‹ [2017-01-28] æ–‡å—ã®Stream [2014-04-29] æ–‡å—列ã®çµåˆ [2007-07-01] å˜ç‹¬ã®çµåˆã®å®Ÿè¡Œæ™‚é–“ ループ内çµåˆã®å®Ÿè¡Œæ™‚é–“ +演算åã®å®Ÿæ…‹ [/2008-01-27] çµè«– [/2014-04-29] æ–‡å—列ã®æ¯”較方法 [2008-04-16] æ–‡å—列比較ã®æ›¸ãé † [2008-05-02] åŠè§’カタカナ・全角ã²ã‚‰ãŒãªå¤‰æ› [2012-06-15] åŠè§’è‹±æ•°å¤‰æ› [2014-04-29] c
StringéžæŽ¨å¥¨ã®å‹§ã‚ - minghaiã®æ—¥è¨˜
Javaプãƒã‚°ãƒ©ãƒ ã«ãŠã„ã¦ï¼Œã‚¯ãƒ©ã‚¹ã‚’作るã“ã¨ã‚’åŽã†äººãŸã¡ãŒå¤šã„． ãã®ã‚ˆã†ãªäººãŸã¡ã®å¤šãã¯ãƒ‡ãƒ¼ã‚¿ã‚’æ¡æ•°ä¾å˜ã«ã¦æ§‹é€ ãŒå˜åœ¨ã™ã‚‹æ–‡å—列ã«ã—ã¦æ‰±ã†ã“ã¨ã‚’好む． ã—ã‹ã—Javaã«ãŠã„ã¦Stringを解æžã™ã‚‹ã“ã¨ã¯å¤šãã®ä¾‹å¤–ã®åŽŸå› ã¨ãªã‚Šï¼Œã²ã„ã¦ã¯ã‚·ã‚¹ãƒ†ãƒ 障害ã®åŽŸå› ã¨ãªã‚‹ã“ã¨ãŒå¤šã„． ã¾ãŸStringã®æ¼”ç®—ã¯é‡ã，Stringã¯ãƒ¡ãƒ¢ãƒªæ¶ˆè²»é‡ãŒå¤šã„． ã“ã®æ–‡ç« ã§ã¯ï¼ŒJava利用システムã«ãŠã„ã¦Stringã®æ¿«ç”¨ã‚’戒ã‚，é©åˆ‡ãªåž‹ã®åˆ©ç”¨ã¨é©åˆ‡ãªã‚¯ãƒ©ã‚¹è¨è¨ˆã‚’è¡Œã†ã“ã¨ã‚’勧ã‚る．*1 Stringã®å•é¡Œ 多発ã™ã‚‹ä¾‹å¤– Stringを利用ã™ã‚‹ã“ã¨ã«ã‚ˆã‚Šç™ºç”Ÿã™ã‚‹ä¾‹å¤–ã«ã¯æ¬¡ã®ã‚‚ã®ãŒã‚る． NullPointerException StringIndexOutOfBoundsException IndexOutOfBoundsException IllegalArgumentException UnsupportedEn
Msgpack can't differentiate between raw binary data and text strings · Issue #121 · msgpack/msgpack
It looks like the msgpack spec does not differentiate between a raw binary data buffer and text strings. This causes some problems in all high-level language wrappers, because most high-level languages have different data types for text strings and binary buffers. For instance, the objective C wrapper is currently broken because it tries to decode all raw bytes into high-level strings (through UTF
æ–‡å—列探索アルゴリズム談義
Ryoma Sin'ya @sinya8282 電通大ã®å¤§å±±å…ˆç”Ÿã®è¬›ç¾©ã§ 「BVMD(BitVisorã®æ‹¡å¼µ[VMM])ã§ã¯I/Oã‚’ClamAVã®ã‚·ã‚°ãƒãƒãƒ£ã‚’å…ƒã«Aho-Corasick 法ã§ãƒžãƒƒãƒãƒ³ã‚°ã—ã¦ãƒžãƒ«ã‚¦ã‚§ã‚¢ã‚’検出ã—ã¦ã¾ã™.ã€ã¨èžã„ãŸ. http://t.co/hsfm11xg 2012-01-12 01:11:54 Ryoma Sin'ya @sinya8282 「Aho-Corasickã¯æ–‡å—列スã‚ップã—ãªã„探索アルゴリズム. 複数文å—列探索ã§ã‚‚スã‚ップを行ã†Commentz-Walter法やWu-Manber法ã®æ–¹ãŒé«˜é€Ÿã§ã™ã‚ˆãƒ¼ã€ã¨æ•™ãˆãŸã‚‰çŸ¥ã‚‰ãªã‹ã£ãŸã‚‰ã—ã喜んã§ãŸ. 2012-01-12 01:15:53
ãŠçŸ¥ã‚‰ã›
ランã‚ング
ランã‚ング
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
Google Code Archive - Long-term storage for Google Code Project Hosting.
robert-bor/aho-corasick · GitHub - Java implementation of the Aho-Corasick algorithm for efficient string matching
http://blog.griddynamics.com/2010/01/java-tricks-reducing-memory-consumption.html
msgpack-1.0-or-1.1.md
Fast algorithm for searching for substrings in a string
{{#tags}}- {{label}}
{{/tags}}