java_java面试大全

ᐌ㾕ⱘ java 䴶䆩ヨ䆩乬໻∛ᘏ˄ϔ˅ 1.ᢑ䈵˖ ᢑ䈵ህᰃᗑ⬹ϔϾ Џ乬ЁϢᔧࠡⳂᷛ᮴݇ⱘ䙷ѯᮍ䴶 ˈҹ֓᳈ܙߚഄ⊼ᛣϢᔧࠡⳂ᳝ᷛ݇ ⱘ ᮍ䴶DŽᢑ䈵ᑊϡᠧㅫњ㾷ܼ䚼䯂乬ˈ㗠াᰃ䗝ᢽ݊Ёⱘϔ䚼ߚˈ᱖ᯊϡ⫼䚼 ߚ㒚㡖DŽᢑ䈵 ࣙᣀϸϾᮍ䴶ˈϔᰃ䖛⿟ᢑ䈵ˈѠᰃ᭄᥂ᢑ䈵DŽ 2.㒻ᡓ˖ 㒻ᡓᰃϔ⾡㘨㒧㉏ⱘሖ⃵῵ൟˈ ᑊϨܕ䆌੠哧ࢅ㉏ⱘ䞡⫼ ˈ ᅗᦤկњϔ⾡ᯢ⹂㸼䗄݅ᗻⱘ ᮍ⊩DŽᇍ䈵ⱘϔϾᮄ㉏ৃҹҢ⦄᳝ⱘ㉏Ё⌒ ⫳ˈ䖭Ͼ䖛⿟⿄Ў㉏㒻ᡓDŽᮄ㉏㒻ᡓњॳྟ㉏ⱘ ⡍ᗻˈᮄ㉏⿄Ўॳྟ㉏ⱘ ⌒⫳㉏˄ᄤ㉏˅ ˈ㗠ॳྟ㉏⿄Ўᮄ㉏ⱘ෎㉏˄⠊㉏˅ DŽ⌒⫳㉏ৃҹҢ ᅗ ⱘ෎㉏䙷䞠㒻ᡓᮍ⊩੠ᅲ՟ব䞣ˈ ᑊϨ㉏ৃҹׂᬍ៪๲ࡴᮄⱘᮍ⊩ՓП᳈ 䗖ড়⡍⅞ⱘ䳔㽕DŽ 3.ᇕ㺙˖ ᇕ㺙ᰃᡞ䖛⿟੠᭄᥂ࣙೈ䍋ᴹˈ ᇍ᭄᥂ⱘ䆓 䯂া㛑䗮䖛ᏆᅮНⱘ⬠䴶DŽ 䴶৥ᇍ䈵䅵ㅫྟѢ 䖭Ͼ෎ᴀὖᗉˈे⦄ᅲϪ⬠ ৃҹ㹿ᦣ㒬៤ϔ㋏߫ᅠܼ㞾⊏ǃᇕ㺙ⱘᇍ䈵ˈ䖭ѯᇍ䈵䗮䖛ϔϾ ফֱᡸⱘ ᥹ষ䆓䯂݊Ҫᇍ䈵DŽ 4. ໮ᗕᗻ˖ ໮ᗕᗻᰃᣛܕ䆌ϡৠ㉏ⱘᇍ䈵ᇍৠϔ⍜ ᙃ԰ߎડᑨDŽ ໮ᗕᗻࣙᣀখ᭄࣪໮ᗕᗻ੠ࣙ৿໮ᗕ ᗻDŽ໮ᗕᗻ䇁㿔݋᳝♉ ⌏ǃᢑ䈵ǃ㸠Ў݅ѿǃҷⷕ݅ѿⱘӬ࢓ˈᕜདⱘ㾷އњᑨ⫼⿟ᑣߑ᭄ ৠৡ 䯂乬DŽ 5ǃString ᰃ᳔෎ᴀⱘ᭄᥂㉏ൟ৫? ෎ᴀ᭄᥂㉏ൟࣙᣀ byteǃ intǃcharǃlongǃfloatǃdoubleǃboolean ੠ shortDŽ java.lang.String ㉏ᰃ final ㉏ൟⱘˈ಴ℸϡৃҹ㒻ᡓ䖭Ͼ㉏ǃϡ㛑 ׂᬍ䖭Ͼ㉏DŽЎњᦤ催ᬜ ⥛㡖ⳕぎ䯈ˈ៥Ӏᑨ䆹⫼ StringBuffer ㉏ 6ǃ int ੠ Integer ᳝ ҔМऎ߿ Java ᦤկϸ⾡ϡৠⱘ㉏ൟ˖ᓩ⫼㉏ൟ੠ॳ ྟ㉏ൟ˄ ៪ݙ㕂㉏ൟ ˅DŽInt ᰃ java ⱘॳྟ᭄᥂ ㉏ൟ Iˈnteger ᰃ java Ў int ᦤկⱘᇕ㺙㉏DŽJava Ў↣Ͼॳྟ㉏ൟᦤկњᇕ㺙㉏DŽ ॳྟ㉏ൟᇕ 㺙㉏ boolean Boolean char Character byte Byte short Short int Integer long Long float Float double Double ᓩ⫼㉏ൟ ੠ॳྟ㉏ൟⱘ㸠Ўᅠܼϡৠ ˈᑊϨᅗӀ݋᳝ϡৠⱘ䇁НDŽ ᓩ⫼㉏ൟ੠ॳྟ ㉏ൟ݋ ᳝ ϡৠⱘ⡍ᕕ੠⫼⊩ˈᅗӀࣙᣀ˖໻ᇣ੠䗳ᑺ䯂乬ˈ䖭⾡㉏ൟҹા ⾡㉏ൟⱘ᭄᥂㒧ᵘᄬټˈ ᔧᓩ⫼㉏ൟ੠ॳྟ㉏ൟ⫼԰ᶤϾ㉏ⱘᅲ՟᭄᥂ᯊ ᠔ᣛᅮⱘ㔎ⳕؐDŽ ᇍ䈵ᓩ⫼ᅲ՟ব䞣ⱘ㔎ⳕ ؐ Ў nullˈ㗠ॳྟ㉏ൟᅲ՟ ব䞣ⱘ㔎ⳕؐϢᅗӀⱘ㉏ൟ᳝݇DŽ 7ǃString ੠ StringBuffer ⱘऎ߿ JAVA ᑇৄᦤկњϸϾ㉏˖ String ੠ StringBufferˈᅗӀৃҹټᄬ੠᪡԰ᄫヺІˈेࣙ৿໮Ͼ ᄫ ヺⱘᄫヺ᭄᥂DŽ䖭Ͼ String ㉏ᦤկњ᭄ؐϡৃᬍবⱘᄫヺІDŽ㗠䖭Ͼ StringBuffer ㉏ᦤկ ⱘᄫヺІ䖯㸠ׂᬍDŽᔧԴⶹ䘧ᄫヺ᭄᥂㽕ᬍবⱘᯊ ׭ԴህৃҹՓ⫼ StringBufferDŽ݌ൟഄ ˈԴৃҹՓ⫼ StringBuffers ᴹࡼᗕᵘ䗴ᄫヺ᭄᥂DŽ 8ǃ䖤㸠ᯊᓖᐌϢϔ㠀ᓖᐌ᳝ԩᓖৠ˛ ᓖᐌ㸼⼎⿟ ᑣ䖤㸠䖛⿟Ёৃ㛑ߎ⦄ⱘ䴲ℷᐌ⢊ᗕˈ 䖤㸠ᯊᓖᐌ㸼⼎㰮ᢳᴎⱘ䗮ᐌ᪡԰ Ёৃ 㛑䘛ࠄⱘᓖᐌˈᰃϔ⾡ᐌ㾕䖤㸠䫭䇃DŽjava 㓪䆥఼㽕∖ᮍ⊩ᖙ乏ໄ ᯢᡯߎৃ㛑থ⫳ⱘ䴲䖤㸠 ᯊᓖᐌˈԚᰃᑊϡ㽕∖ᖙ乏ໄᯢᡯߎ᳾㹿ᤩ㦋ⱘ 䖤㸠ᯊᓖᐌDŽ 9ǃ䇈ߎ Servlet ⱘ⫳ੑ਼ᳳˈᑊ䇈ߎ Servlet ੠ CGI ⱘऎ߿DŽ Servlet 㹿᳡ࡵ఼ᅲ՟࣪ৢˈᆍ఼䖤㸠݊ init ᮍ⊩ˈ䇋∖ࠄ 䖒ᯊ䖤㸠݊ service ᮍ⊩ˈservice ᮍ⊩㞾ࡼ⌒䘷䖤㸠Ϣ䇋∖ᇍᑨⱘ doXXX ᮍ⊩˄doGetˈdoPost˅ㄝˈᔧ᳡ࡵ఼އᅮᇚᅲ՟䫔 ↕ⱘᯊ׭䇗 ⫼݊ destroy ᮍ⊩DŽ Ϣ cgi ⱘऎ߿೼Ѣ servlet ໘Ѣ᳡ࡵ఼䖯⿟Ёˈ ᅗ䗮䖛໮㒓⿟ᮍᓣ䖤㸠݊ service ᮍ⊩ˈϔϾ ᅲ՟ৃҹ᳡ࡵѢ໮Ͼ䇋∖ˈ ᑊϨ݊ᅲ՟ϔ㠀ϡӮ䫔↕ˈ㗠 CGI ᇍ↣Ͼ䇋∖䛑ѻ⫳ᮄⱘ䖯⿟ˈ ᳡ࡵᅠ ៤ৢህ䫔↕ ᠔ˈҹᬜ⥛ϞԢѢ servletDŽ 10ǃ䇈ߎ ArrayList,Vector, LinkedList ⱘᄬټᗻ㛑੠⡍ᗻ ArrayList ੠ Vector 䛑ᰃՓ⫼᭄㒘 ᮍᓣᄬټ᭄᥂ˈℸ᭄㒘ܗ㋴᭄໻Ѣᅲ䰙ᄬټⱘ᭄᥂ҹ֓ ๲ࡴ੠ᦦܹܗ㋴ˈ ᅗӀ䛑ܕ䆌Ⳉ᥹ᣝᑣো㋶ᓩܗ㋴ˈ Ԛᰃᦦܹܗ㋴㽕⍝ঞ᭄㒘ܗ㋴⿏ࡼㄝݙ ᄬ᪡԰ˈ ᠔ҹ㋶ᓩ᭄᥂ᖿ㗠ᦦ᭄ܹ᥂᜶ˈ Vector ⬅ѢՓ⫼њ synchronized ᮍ⊩ ˄ 㒓⿟ᅝܼ˅ ˈ 䗮ᐌᗻ㛑Ϟ䕗 ArrayList Ꮒˈ 㗠 LinkedList Փ⫼ঠ৥䫒㸼ᅲ⦄ᄬټˈᣝᑣো㋶ᓩ᭄᥂䳔㽕䖯㸠 ࠡ ৥ ៪ৢ৥䘡ग़ˈԚᰃᦦ᭄ܹ᥂ᯊা䳔㽕䆄ᔩᴀ乍ⱘࠡৢ乍ेৃˈ᠔ҹᦦܹ䗳ᑺ 䕗ᖿDŽ 11ǃEJB ᰃ෎Ѣાѯᡔᴃᅲ⦄ⱘ˛ᑊ䇈ߎ SessionBean ੠ EntityBean ⱘऎ߿ SˈtatefulBean ੠ StatelessBean ⱘऎ߿DŽ EJB ࣙᣀ Session BeanǃEntity BeanǃMessage Driven Beanˈ෎Ѣ JNDIǃRMIǃJAT ㄝᡔᴃ ᅲ⦄DŽ SessionBean ೼ J2EE ᑨ⫼⿟ᑣЁ㹿 ⫼ᴹᅠ៤ϔѯ᳡ࡵ఼ッⱘϮࡵ᪡԰ˈ՟བ䆓䯂᭄᥂ᑧǃ䇗 ⫼݊Ҫ EJB 㒘 ӊDŽEntityBean 㹿⫼ᴹҷ㸼ᑨ⫼㋏㒳Ё⫼ࠄⱘ᭄᥂DŽ ᇍѢᅶ᠋ᴎˈ SessionBean ᰃϔ⾡䴲ᣕЙᗻᇍ䈵ˈ ᅗᅲ⦄ᶤѯ೼᳡ࡵ఼Ϟ䖤㸠ⱘϮࡵ 䘏䕥DŽ ᇍѢᅶ᠋ᴎˈEntityBean ᰃϔ⾡ᣕЙᗻᇍ䈵ˈᅗҷ㸼ϔϾᄬټ೼ ᣕЙᗻᄬټ఼Ёⱘᅲԧⱘ ᇍ䈵㾚೒ˈ៪ᰃϔϾ⬅⦄᳝ӕϮᑨ⫼⿟ᑣᅲ⦄ⱘ ᅲԧDŽ Session Bean 䖬ৃҹݡ㒚ߚЎ Stateful Session Bean Ϣ Stateless Session Bean ˈ 䖭ϸ⾡ⱘ Session Bean 䛑ৃҹᇚ㋏㒳 䘏䕥ᬒ೼ method ПЁᠻ㸠ˈϡৠⱘᰃ Stateful Session Bean ৃ ҹ 䆄ᔩ੐ি㗙ⱘ⢊ᗕˈ಴ℸ䗮ᐌᴹ䇈ˈϔϾՓ⫼㗙Ӯ᳝ϔϾⳌᇍᑨⱘ Stateful Session Bean ⱘᅲԧDŽStateless Session Bean 㱑✊ гᰃ䘏䕥㒘ӊ ԚˈᰃҪैϡ䋳䋷䆄ᔩՓ⫼㗙⢊ᗕ гˈህ ᰃ 䇈 ᔧՓ ⫼㗙 ੐ ি Stateless Session Bean ⱘ ᯊ׭ˈ EJB Container ᑊϡ Ӯᡒ ᇏ ⡍ᅮ ⱘ Stateless Session Bean ⱘᅲԧᴹᠻ㸠䖭Ͼ methodDŽ ᤶ㿔Пˈᕜৃ㛑᭄ϾՓ⫼㗙೼ᠻ㸠ᶤϾ Stateless Session Bean ⱘ methods ᯊˈӮᰃৠϔϾ Bean ⱘ Instance ೼ᠻ㸠DŽҢݙᄬᮍ䴶 ᴹ ⳟˈ Stateful Session Bean Ϣ Stateless Session Bean ↨䕗 ˈ Stateful Session Bean Ӯ⍜㗫 J2EE Server 䕗໮ⱘݙᄬˈ ✊㗠 Stateful Session Bean ⱘӬ ࢓ै೼ѢҪৃҹ㓈ᣕՓ⫼㗙ⱘ⢊ᗕDŽ 12ǃCollection ੠ Collections ⱘऎ߿DŽ Collection ᰃ䲚ড়㉏ⱘϞ㑻᥹ষˈ㒻ᡓϢҪⱘ᥹ষЏ㽕᳝ Set ੠ List. Collections ᰃ䩜ᇍ䲚ড়㉏ⱘϔϾᐂࡽ㉏ˈҪᦤկϔ㋏߫䴭ᗕ ᮍ⊩ᅲ⦄ᇍ৘⾡䲚ড়ⱘ᧰㋶ǃᥦ ᑣǃ㒓⿟ᅝܼ࣪ㄝ᪡԰DŽ 13ǃ&੠&&ⱘऎ ߿DŽ &ᰃԡ䖤ㅫヺ 㸼ˈ⼎ᣝԡϢ䖤ㅫ &ˈ&ᰃ䘏䕥䖤ㅫヺ 㸼ˈ⼎䘏䕥Ϣ˄ and ˅DŽ 14ǃHashMap ੠ Hashtable ⱘऎ߿DŽ HashMap ᰃ Hashtable ⱘ䕏 䞣㑻ᅲ⦄˄䴲㒓⿟ᅝܼⱘᅲ⦄˅ ˈҪӀ䛑ᅠ៤њ Map ᥹ষˈ Џ㽕ऎ߿೼ Ѣ HashMap ܕ䆌ぎ ˄ null˅ ˄key˅ 䬂ؐ ,⬅Ѣ䴲㒓⿟ᅝܼˈ ᬜ⥛ Ϟৃ㛑催Ѣ HashtableDŽ HashMap ܕ䆌ᇚ null ԰ЎϔϾ entry ⱘ key ៪㗙 valueˈ㗠 Hashtable ϡܕ䆌DŽ HashMap ᡞ Hashtable ⱘ contains ᮍ⊩এᥝњˈ ᬍ៤ containsvalue ੠ containsKeyDŽ ಴ Ў contains ᮍ⊩ᆍᯧ䅽Ҏᓩ䍋䇃㾷DŽ Hashtable 㒻ᡓ㞾 Dictionary ㉏ˈ㗠 HashMap ᰃ Java1.2 ᓩ䖯ⱘ Map interface ⱘϔϾᅲ⦄DŽ ᳔ ໻ⱘϡৠᰃˈHashtable ⱘᮍ⊩ᰃ Synchronize ⱘˈ㗠 HashMap ϡ ᰃˈ೼໮Ͼ㒓⿟䆓䯂 Hashtable ᯊˈϡ䳔㽕㞾ᏅЎᅗⱘᮍ⊩ᅲ⦄ৠℹˈ 㗠 HashMap ህᖙ乏ЎПᦤկ໪ৠℹDŽ Hashtable ੠ HashMap 䞛⫼ⱘ hash/rehash ㅫ⊩䛑໻ὖϔḋ ᠔ˈҹᗻ㛑ϡӮ᳝ᕜ໻ⱘᏂᓖDŽ 15ǃfinal, finally, finalize ⱘऎ߿DŽ final ⫼Ѣໄᯢሲᗻˈᮍ⊩੠㉏ˈߚ߿ 㸼⼎ሲᗻϡৃবˈᮍ⊩ϡৃ㽚Ⲫˈ㉏ϡৃ㒻ᡓDŽ finally ᰃᓖᐌ໘⧚䇁হ 㒧ᵘⱘϔ䚼ߚˈ㸼⼎ᘏᰃᠻ㸠DŽ finalize ᰃ Object ㉏ⱘϔϾᮍ⊩ˈ ೼ൗഒᬊ䲚఼ᠻ㸠ⱘᯊ׭Ӯ䇗⫼㹿ಲᬊᇍ䈵ⱘℸᮍ⊩ˈৃ ҹ㽚Ⲫℸᮍ⊩ᦤ կൗഒᬊ䲚ᯊⱘ݊Ҫ䌘⑤ಲᬊ ՟ˈབ݇䯁᭛ӊㄝDŽ 16ǃsleep() ੠ wait() ᳝ҔМऎ߿? sleep ᰃ㒓⿟㉏˄Thread˅ⱘᮍ⊩ˈᇐ㟈ℸ㒓⿟᱖ذᠻ㸠 ᣛᅮᯊ䯈ˈ㒭ᠻ㸠ᴎӮ㒭݊Ҫ 㒓⿟ˈԚᰃⲥ᥻⢊ᗕձ✊ֱᣕˈࠄᯊৢӮ㞾 ࡼᘶ໡DŽ䇗⫼ sleep ϡӮ䞞ᬒᇍ䈵䫕DŽ wait ᰃ Object ㉏ⱘᮍ⊩ˈᇍ ℸᇍ䈵䇗⫼ wait ᮍ⊩ᇐ㟈ᴀ㒓⿟ᬒᓗᇍ䈵䫕ˈ䖯ܹㄝᕙℸᇍ䈵 ⱘㄝᕙ䫕 ᅮ∴ˈা᳝䩜ᇍℸᇍ䈵থߎ notify ᮍ⊩˄៪ notifyAll˅ৢᴀ㒓⿟ᠡ 䖯ܹᇍ䈵䫕ᅮ∴ ޚ໛㦋ᕫᇍ䈵䫕䖯ܹ䖤㸠⢊ᗕDŽ 17ǃOverload ੠ Override ⱘऎ߿DŽOverloaded ⱘᮍ⊩ᰃ৺ৃҹᬍব䖨ಲؐⱘ㉏ൟ? ᮍ ⊩ⱘ䞡ݭ Overriding ੠䞡䕑 Overloading ᰃ Java ໮ᗕᗻⱘϡৠ㸼 ⦄DŽ䞡ݭ Overriding ᰃ ⠊㉏Ϣᄤ㉏П䯈໮ᗕᗻⱘϔ⾡㸼⦄ˈ䞡䕑 Overloading ᰃϔϾ㉏Ё໮ᗕᗻⱘϔ⾡㸼⦄DŽབᵰ ೼ᄤ㉏ЁᅮНᶤᮍ⊩ Ϣ݊⠊㉏᳝Ⳍৠⱘৡ⿄੠খ᭄ˈ៥Ӏ䇈䆹ᮍ⊩㹿䞡ݭ (Overriding)DŽᄤ ㉏ⱘᇍ䈵Փ⫼䖭Ͼᮍ⊩ᯊˈᇚ䇗⫼ᄤ㉏ЁⱘᅮНˈᇍᅗ㗠㿔ˈ⠊㉏ЁⱘᅮН བৠ㹿"ሣ㬑" њDŽ བᵰ೼ϔϾ㉏ЁᅮНњ໮Ͼৠৡⱘᮍ⊩ˈ ᅗӀ៪᳝ϡ ৠⱘখ᭄Ͼ᭄៪᳝ϡৠⱘখ᭄㉏ൟˈ ߭ ⿄Ўᮍ⊩ⱘ䞡䕑(Overloading)DŽ Overloaded ⱘᮍ⊩ᰃৃҹᬍব䖨ಲؐⱘ㉏ൟDŽ 18ǃerror ੠ exception ᳝ ҔМऎ߿? error 㸼⼎ᘶ໡ϡᰃϡৃ㛑Ԛᕜೄ䲒ⱘᚙމϟ ⱘϔ⾡Ϲ䞡䯂乬DŽ↨བ䇈ݙᄬ⑶ߎDŽϡৃ㛑 ᣛᳯ⿟ᑣ㛑໘⧚䖭ḋⱘᚙމDŽ exception 㸼⼎ϔ⾡䆒䅵៪ᅲ⦄䯂乬DŽ гህᰃ䇈ˈᅗ㸼⼎བᵰ⿟ᑣ䖤㸠ℷᐌˈҢϡӮথ ⫳ⱘᚙމDŽ 19ǃৠℹ੠ᓖ ℹ᳝ԩᓖৠˈ೼ҔМᚙމϟߚ߿Փ⫼ҪӀ˛В՟䇈ᯢDŽ བᵰ᭄᥂ᇚ೼㒓⿟ 䯈݅ѿDŽ ՟བℷ೼ݭⱘ᭄᥂ҹৢৃ㛑㹿঺ϔϾ㒓⿟䇏ࠄ ˈ៪㗙ℷ೼䇏ⱘ ᭄ ᥂ৃ㛑Ꮖ㒣㹿঺ϔϾ㒓⿟ݭ䖛њˈ䙷М䖭ѯ᭄᥂ህᰃ݅ѿ᭄᥂ˈᖙ乏䖯㸠ৠ ℹᄬপDŽ ᔧᑨ⫼⿟ᑣ೼ᇍ䈵Ϟ䇗⫼њϔϾ䳔㽕㢅䌍ᕜ䭓ᯊ䯈ᴹᠻ㸠ⱘᮍ⊩ ˈ ᑊϨϡᏠᳯ䅽⿟ᑣㄝᕙᮍ ⊩ⱘ䖨ಲᯊˈህᑨ䆹Փ⫼ᓖℹ㓪⿟ˈ೼ᕜ໮ᚙމ ϟ䞛⫼ᓖℹ䗨ᕘᕔᕔ᳈᳝ᬜ⥛DŽ 20ǃabstract class ੠ interface ᳝ ҔМऎ߿? ໄᯢᮍ⊩ⱘᄬ೼㗠ϡএᅲ⦄ᅗⱘ㉏㹿িخᢑ䈵㉏˄abstract class˅ ˈ ᅗ⫼Ѣ㽕߯ᓎϔϾԧ⦄ ᶤ ѯ෎ᴀ㸠Ўⱘ㉏ˈ ᑊЎ䆹㉏ໄᯢᮍ ⊩ˈ Ԛϡ㛑೼䆹㉏Ёᅲ⦄䆹㉏ⱘᚙމDŽ ϡ㛑߯ᓎ abstract ㉏ⱘᅲ՟DŽ ✊㗠ৃҹ߯ᓎϔϾব䞣 ˈ݊ ㉏ൟᰃϔϾᢑ䈵㉏ ˈᑊ䅽ᅗᣛ৥݋ԧᄤ㉏ⱘϔ Ͼᅲ՟DŽ ϡ㛑᳝ᢑ䈵ᵘ䗴ߑ᭄៪ᢑ䈵䴭ᗕᮍ⊩DŽ Abstract ㉏ⱘᄤ㉏Ў ᅗӀ⠊㉏Ёⱘ᠔᳝ᢑ䈵ᮍ⊩ᦤկ ᅲ⦄ˈ৺߭ᅗӀгᰃᢑ䈵㉏ЎDŽপ㗠ҷПˈ ೼ᄤ㉏Ёᅲ⦄䆹ᮍ⊩DŽⶹ䘧݊㸠Ўⱘ݊ᅗ㉏ৃҹ ೼㉏Ёᅲ⦄䖭ѯᮍ⊩DŽ ᥹ ষ˄interface˅ᰃᢑ䈵㉏ⱘবԧDŽ೼᥹ষЁˈ᠔᳝ᮍ⊩䛑ᰃᢑ䈵ⱘDŽ໮ 㒻ᡓᗻৃ䗮䖛ᅲ ⦄䖭ḋⱘ᥹ষ㗠㦋ᕫDŽ᥹ষЁⱘ᠔᳝ᮍ⊩䛑ᰃᢑ䈵ⱘˈ≵ ᳝ϔϾ᳝⿟ᑣԧDŽ᥹ষাৃҹᅮН static final ៤ਬব䞣DŽ᥹ষⱘᅲ⦄ Ϣᄤ㉏ⳌԐˈ䰸њ䆹ᅲ⦄㉏ϡ㛑Ң᥹ষᅮНЁ㒻ᡓ㸠ЎDŽ ᔧ㉏ᅲ⦄⡍⅞᥹ ষᯊˈᅗᅮН˄ेᇚ⿟ᑣԧ㒭ќ˅᠔᳝䖭⾡᥹ষⱘᮍ⊩DŽ✊ৢˈᅗৃҹ೼ᅲ ⦄њ䆹᥹ষⱘ㉏ⱘӏԩᇍ䈵Ϟ䇗⫼᥹ষⱘᮍ⊩DŽ ⬅Ѣ᳝ᢑ䈵㉏ ˈᅗܕ䆌Փ ⫼᥹ষৡ԰Ўᓩ⫼ ব䞣ⱘ㉏ൟDŽ䗮ᐌⱘࡼᗕ㘨㓪ᇚ⫳ᬜDŽᓩ⫼ৃҹ䕀ᤶࠄ ᥹ষ㉏ൟ៪Ң᥹ষ㉏ൟ䕀ᤶˈ instanceof 䖤ㅫヺৃҹ⫼ᴹއᅮᶤᇍ䈵ⱘ ㉏ᰃ৺ᅲ⦄њ᥹ষDŽ 21ǃheap ੠ stack ᳝ ҔМऎ߿DŽ ᷜ ᰃϔ⾡㒓ᔶ䲚 ড় ˈ݊ ⏏ࡴ੠ߴ䰸ܗ㋴ⱘ᪡԰ᑨ೼ৠϔ↉ᅠ៤DŽ ᷜᣝ✻ৢ䖯ܜߎⱘᮍᓣ䖯 㸠໘⧚DŽ ේᰃᷜⱘϔϾ㒘៤ܗ㋴ 22ǃforward ੠ redirect ⱘऎ߿ forward ᰃ᳡ࡵ఼䇋∖䌘⑤ˈ᳡ࡵ఼Ⳉ᥹䆓䯂Ⳃᷛഄഔⱘ URLˈᡞ䙷Ͼ URL ⱘડᑨݙᆍ䇏 প䖛ᴹˈ ✊ৢᡞ䖭ѯݙᆍݡথ㒭⌣㾜఼ˈ ⌣㾜఼ḍᴀ ϡⶹ䘧᳡ࡵ఼থ䗕ⱘݙᆍᰃҢાܓᴹⱘˈ ᠔ҹᅗⱘഄഔᷣЁ䖬ᰃॳᴹⱘഄ ഔDŽ redirect ህᰃ᳡ࡵッḍ᥂䘏䕥,থ䗕ϔϾ⢊ᗕⷕ,ਞ䆝⌣㾜఼䞡ᮄএ 䇋∖䙷Ͼഄഔ ˈϔ㠀ᴹ 䇈⌣㾜఼Ӯ⫼߮ᠡ䇋∖ⱘ᠔᳝খ᭄䞡ᮄ䇋∖ˈ᠔ҹ session,request খ᭄䛑ৃҹ㦋পDŽ 23ǃEJB Ϣ JAVA BEAN ⱘऎ߿˛ Java Bean ᰃৃ໡⫼ⱘ㒘ӊˈᇍ Java Bean ᑊ≵᳝ϹḐⱘ㾘㣗ˈ⧚䆎 Ϟ䆆ˈӏԩϔϾ Java ㉏䛑ৃҹᰃϔϾ BeanDŽԚ䗮ᐌᚙމϟˈ⬅Ѣ Java Bean ᰃ㹿ᆍ఼᠔߯ᓎ˄བ Tomcat˅ⱘˈ᠔ ҹ Java Bean ᑨ݋᳝ϔϾ ᮴খⱘᵘ䗴఼ˈ ঺໪ˈ 䗮ᐌ Java Bean 䖬㽕ᅲ⦄ Serializable ᥹ ষ⫼Ѣ ᅲ⦄ Bean ⱘᣕЙᗻDŽJava Bean ᅲ䰙ϞⳌᔧѢᖂ䕃 COM ῵ൟ Ёⱘᴀഄ䖯⿟ݙ COM 㒘ӊ ᅗˈ ᰃϡ㛑㹿䎼䖯⿟䆓䯂ⱘDŽEnterprise Java Bean ⳌᔧѢ DCOMˈे ߚᏗᓣ㒘ӊDŽᅗᰃ෎Ѣ Java ⱘ䖰⿟ᮍ⊩䇗⫼˄ RMI˅ ᡔᴃⱘˈ᠔ҹ EJB ৃ ҹ㹿䖰⿟䆓䯂˄䎼䖯⿟ǃ䎼䅵ㅫᴎ˅ DŽԚ EJB ᖙ 乏 㹿Ꮧ㕆೼䇌བ Webspereǃ WebLogic 䖭ḋⱘᆍ఼Ёˈ ᅶ᠋ҢϡⳈ᥹䆓 䯂ⳳℷⱘ EJB 㒘ӊˈ EJB 㗠ᰃ䗮䖛݊ᆍ఼䆓䯂DŽEJB ᆍ఼ᰃ EJB 㒘ӊⱘҷ⧚ˈ EJB 㒘ӊ⬅ᆍ ఼᠔߯ᓎ੠ㅵ⧚DŽᅶ᠋䗮 䖛ᆍ఼ᴹ䆓䯂ⳳℷⱘ EJB 㒘ӊDŽ 24ǃStatic Nested Class ੠ Inner Class ⱘϡৠDŽ Static Nested Class ᰃ 㹿ໄᯢЎ䴭ᗕ˄ static ⱘ˅ݙ䚼㉏ ᅗˈৃҹϡձ䌪Ѣ໪䚼㉏ᅲ՟㹿ᅲ ՟࣪DŽ 㗠䗮ᐌⱘݙ䚼㉏䳔㽕೼໪䚼㉏ᅲ՟࣪ৢᠡ㛑ᅲ՟࣪DŽ 25ǃJSP Ёࡼᗕ INCLUDE Ϣ䴭ᗕ INCLUDE ⱘऎ߿˛ ࡼᗕ INCLUDE ⫼ jsp:include ࡼ԰ᅲ⦄ ᅗᘏᰃ ӮẔᶹ᠔৿᭛ӊЁⱘব࣪ˈ䗖ড়⫼Ѣࣙ৿ࡼᗕ义䴶ˈᑊϨৃҹᏺখ ᭄DŽ 䴭ᗕ INCLUDE ⫼ include Ӿⷕᅲ⦄,ᅮϡӮẔᶹ᠔৿᭛ӊⱘব࣪ˈ 䗖⫼Ѣࣙ৿䴭ᗕ义䴶<%@ include file="included.htm" %> 26ǃҔ Мᯊ׭⫼ assertDŽ assertion(ᮁ㿔)೼䕃ӊᓔথЁᰃϔ⾡ᐌ⫼ⱘ䇗䆩ᮍ ᓣˈ ᕜ໮ᓔথ䇁㿔Ё䛑ᬃᣕ䖭⾡ᴎࠊDŽ ೼ᅲ⦄Ёˈassertion ህᰃ೼⿟ ᑣЁⱘϔᴵ䇁হˈᅗᇍϔϾ boolean 㸼䖒ᓣ䖯㸠ẔᶹˈϔϾℷ ⹂⿟ᑣᖙ 乏ֱ䆕䖭Ͼ boolean 㸼䖒ᓣⱘؐЎ true˗བᵰ䆹ؐЎ falseˈ䇈ᯢ⿟ ᑣᏆ㒣໘Ѣϡℷ ⹂ⱘ⢊ᗕϟˈ㋏㒳ᇚ㒭ߎ䄺ਞ៪䗔ߎDŽϔ㠀ᴹ䇈ˈ assertion ⫼Ѣֱ䆕⿟ᑣ᳔෎ᴀǃ݇䬂ⱘℷ ⹂ᗻDŽassertion Ẕᶹ䗮 ᐌ೼ᓔথ੠⌟䆩ᯊᓔਃDŽЎњᦤ催ᗻ㛑ˈ೼䕃ӊথᏗৢˈassertion Ẕᶹ 䗮ᐌᰃ݇䯁ⱘDŽ 27ǃGC ᰃҔМ? ЎҔМ㽕᳝ GC? GC ᰃൗഒᬊ䲚ⱘᛣᗱ ˄Gabage Collection˅,ݙᄬ໘⧚ᰃ㓪⿟Ҏਬᆍᯧߎ⦄䯂乬ⱘഄᮍˈ ᖬ 䆄៪㗙䫭䇃ⱘݙᄬಲᬊӮᇐ㟈⿟ᑣ៪㋏㒳ⱘϡ〇ᅮ⫮㟇ዽ⑗ˈJava ᦤկⱘ GC ࡳ㛑ৃҹ㞾 ࡼⲥ⌟ᇍ䈵ᰃ৺䍙䖛԰⫼ඳҢ㗠䖒ࠄ㞾ࡼಲᬊݙᄬⱘⳂⱘ ˈ Java 䇁㿔≵᳝ᦤկ䞞ᬒᏆߚ䜡ݙ ᄬⱘᰒ⼎᪡԰ᮍ⊩DŽ 28ǃshort s1 = 1; s1 = s1 + 1;᳝ҔМ䫭? short s1 = 1; s1 += 1;᳝ҔМ䫭? short s1 = 1; s1 = s1 + 1; ˄ s1+1 䖤ㅫ㒧ᵰᰃ int ൟˈ䳔㽕ᔎࠊ䕀ᤶ㉏ ൟ ˅short s1 = 1; s1 += 1;˄ ৃҹℷ⹂㓪䆥 ˅29ǃMath.round(11.5) ㄝᮐ໮ᇥ? Math.round(-11.5)ㄝᮐ໮ᇥ? Math.round(11.5)==12 Math.round(-11.5)==-11 round ᮍ⊩䖨ಲϢখ᳔᭄᥹䖥ⱘ䭓ᭈ᭄ˈ খ᭄ࡴ 1/2 ৢ ∖݊ floor. 30ǃString s = new String("xyz"); ߯ᓎњ޴Ͼ String Object? ϸϾ 31ǃEJB ࣙᣀ ˄SessionBean,EntityBean˅䇈ߎҪӀⱘ⫳ੑ਼ᳳˈঞབԩㅵ⧚џࡵ ⱘ˛ SessionBean˖ Stateless Session Bean ⱘ⫳ੑ਼ᳳᰃ⬅ᆍ ఼އᅮⱘˈᔧᅶ᠋ᴎথߎ䇋∖㽕 ᓎゟϔϾ Bean ⱘᅲ՟ᯊˈEJB ᆍ఼ϡϔ ᅮ㽕߯ᓎϔϾᮄⱘ Bean ⱘᅲ՟կᅶ᠋ᴎ䇗⫼ˈ㗠ᰃ 䱣֓ᡒϔϾ⦄᳝ⱘᅲ ՟ᦤկ㒭ᅶ᠋ᴎDŽᔧᅶ᠋ᴎ㄀ϔ⃵䇗⫼ϔϾ Stateful Session Bean ᯊ ˈ ᆍ఼ᖙ乏ゟे೼᳡ࡵ఼Ё߯ᓎϔϾᮄⱘ Bean ᅲ՟ˈᑊ݇㘨ࠄᅶ᠋ᴎϞˈ ҹৢℸᅶ᠋ᴎ䇗⫼ Stateful Session Bean ⱘᮍ⊩ᯊᆍ఼Ӯᡞ䇗⫼ߚ⌒ࠄϢℸᅶ᠋ᴎ Ⳍ݇㘨ⱘ Bean ᅲ՟DŽ EntityBean˖Entity Beans 㛑ᄬ⌏Ⳍᇍ䕗䭓 ⱘᯊ䯈 ᑊˈϨ⢊ᗕᰃᣕ㓁ⱘDŽা㽕᭄᥂ᑧЁⱘ᭄᥂ ᄬ೼ Eˈntity beans ህ ϔⳈᄬ⌏DŽ㗠ϡᰃᣝ✻ᑨ⫼⿟ᑣ៪㗙᳡ࡵ䖯⿟ᴹ䇈ⱘDŽेՓ EJB ᆍ఼ ዽ ⑗њˈEntity beans гᰃᄬ⌏ⱘDŽEntity Beans ⫳ੑ਼ᳳ㛑໳㹿ᆍ ఼៪㗙 Beans 㞾Ꮕㅵ⧚DŽ EJB 䗮䖛ҹϟᡔᴃㅵ⧚ᅲࡵ˖ ᇍ䈵ㅵ⧚㒘㒛 ˄OMG ˅ⱘᇍ䈵ᅲࡵ᳡ࡵ ˄ OTS S˅un Microsystems ˈ ⱘ Transaction Service˄ JTS ˅ǃJava Transaction API˄ JTA ˅ˈ ᓔথ㒘˄ X/Open˅ ⱘ XA ᥹ষDŽ 32ǃᑨ⫼᳡ࡵ఼᳝䙷ѯ˛ BEA WebLogic ServerˈIBM WebSphere Application ServerˈOracle9i Application Serverˈ jBossˈ Tomcat 33ǃ㒭៥ϔϾԴ᳔ᐌ㾕ࠄⱘ runtime exceptionDŽ ArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException, ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException 34ǃ᥹ষᰃ৺ৃ㒻ᡓ᥹ষ? ᢑ䈵 ㉏ᰃ৺ৃᅲ⦄(implements)᥹ষ? ᢑ䈵㉏ᰃ৺ৃ㒻ᡓᅲԧ㉏ (concrete class)? ᥹ষৃҹ㒻ᡓ᥹ষDŽᢑ䈵㉏ৃҹᅲ⦄(implements) ᥹ষˈᢑ䈵㉏ᰃ৺ৃ㒻ᡓᅲԧ㉏ˈԚࠡ ᦤᰃᅲԧ㉏ᖙ乏᳝ᯢ⹂ⱘᵘ䗴ߑ᭄DŽ 35ǃList, Set, Map ᰃ৺㒻ᡓ㞾 Collection ᥹ষ? ListˈSet ᰃˈ Map ϡᰃ 36ǃ䇈ߎ᭄᥂䖲᥹∴ⱘᎹ԰ᴎࠊᰃҔМ? J2EE ᳡ࡵ఼ਃࡼᯊӮ ᓎゟϔᅮ᭄䞣ⱘ∴䖲᥹ˈᑊϔⳈ㓈ᣕϡᇥѢℸ᭄Ⳃⱘ∴䖲᥹DŽᅶ᠋ ッ⿟ᑣ 䳔㽕䖲᥹ᯊ ˈ∴偅ࡼ⿟ᑣӮ䖨ಲϔϾ᳾Փ⫼ⱘ∴䖲᥹ᑊᇚ݊㸼䆄ЎᖭDŽ བ ᵰᔧࠡ≵᳝ ぎ䯆䖲᥹ˈ∴偅ࡼ⿟ᑣህᮄᓎϔᅮ᭄䞣ⱘ䖲᥹ˈᮄᓎ䖲᥹ⱘ᭄ 䞣᳝䜡㕂খ᭄އᅮDŽᔧՓ⫼ⱘ ∴䖲᥹䇗⫼ᅠ៤ৢˈ∴偅ࡼ⿟ᑣᇚℸ䖲᥹㸼 䆄Ўぎ䯆ˈ݊ Ҫ䇗⫼ህৃҹՓ⫼䖭Ͼ䖲᥹DŽ 37ǃ abstract ⱘ method ᰃ ৺ৃৠᯊᰃ static,ᰃ৺ৃৠᯊᰃ nativeˈ ᰃ৺ৃৠᯊᰃ synchronized? 䛑ϡ㛑 38ǃ᭄㒘᳝≵᳝ length()䖭Ͼᮍ⊩? String ᳝≵᳝ length()䖭Ͼᮍ⊩˛ ᭄㒘≵᳝ length()䖭Ͼᮍ⊩ˈ᳝ length ⱘሲᗻDŽString ᳝ ᳝ length()䖭Ͼᮍ⊩DŽ 39ǃSet 䞠ⱘܗ㋴ᰃϡ㛑 䞡໡ⱘˈ䙷М⫼ҔМᮍ⊩ᴹऎߚ䞡໡Ϣ৺ਸ਼? ᰃ⫼==䖬ᰃ equals()? ᅗ Ӏ᳝ԩऎ߿? Set 䞠ⱘܗ㋴ᰃϡ㛑䞡໡ⱘˈ 䙷М⫼ iterator()ᮍ⊩ᴹऎߚ䞡໡ Ϣ৺DŽ equals()ᰃ߸䇏ϸϾ Set ᰃ৺ⳌㄝDŽ equals()੠==ᮍ⊩އᅮ ᓩ⫼ؐᰃ৺ᣛ৥ৠϔᇍ䈵 equals()೼㉏Ё㹿㽚Ⲫˈ ЎⱘᰃᔧϸϾߚ ⾏ ⱘᇍ䈵ⱘݙᆍ੠㉏ൟⳌ䜡ⱘ䆱ˈ䖨ಲⳳؐDŽ 40ǃᵘ䗴఼ Constructor ᰃ ৺ৃ㹿 override? ᵘ 䗴఼ Constructor ϡ㛑㹿㒻ᡓˈ಴ℸϡ㛑䞡ݭ Overriding Ԛˈৃҹ㹿䞡䕑 OverloadingDŽ 41ǃᰃ৺ৃҹ㒻ᡓ String ㉏? String ㉏ᰃ final ㉏ᬙϡৃҹ㒻ᡓDŽ 42ǃswtich ᰃ৺㛑԰⫼೼ byte Ϟˈᰃ৺㛑԰⫼೼ long Ϟˈᰃ৺ 㛑԰⫼೼ String Ϟ? switch˄expr1˅Ёˈexpr1 ᰃϔϾᭈ᭄㸼䖒ᓣDŽ ಴ℸӴ䗦㒭 switch ੠ case 䇁হⱘখ᭄ᑨ 䆹ᰃ intǃ shortǃ char ៪㗙 byteDŽlong,string 䛑ϡ㛑԰⫼Ѣ swtichDŽ 43ǃtry {}䞠᳝ ϔϾ return 䇁হˈ䙷М㋻䎳೼䖭Ͼ try ৢ ⱘ finally {}䞠ⱘ code ӮϡӮ㹿ᠻ㸠ˈ ҔМᯊ׭㹿ᠻ㸠ˈ೼ return ࠡ 䖬ᰃৢ? Ӯᠻ㸠ˈ೼ return ࠡ ᠻ㸠DŽ 44ǃ㓪⿟乬: ⫼᳔᳝ᬜ⥛ⱘᮍ⊩ㅫߎ 2 Ьҹ 8 ㄝᮐ޴? 2 << 3 45ǃϸϾᇍ䈵ؐⳌৠ(x.equals(y) == true)ˈԚैৃ᳝ϡৠ ⱘ hash codeˈ䖭হ䆱ᇍϡᇍ? ϡᇍˈ᳝Ⳍৠⱘ hash codeDŽ 46ǃᔧ ϔϾᇍ䈵㹿ᔧ԰খ᭄Ӵ䗦ࠄϔϾᮍ⊩ৢˈℸᮍ⊩ৃᬍব䖭Ͼᇍ䈵ⱘሲᗻˈᑊ ৃ䖨ಲব ࣪ৢⱘ㒧ᵰˈ䙷М䖭䞠ࠄᑩᰃؐӴ䗦䖬ᰃᓩ⫼Ӵ䗦? ᰃؐӴ䗦DŽ Java 㓪⿟䇁㿔া᳝ؐӴ䗦খ᭄DŽᔧϔϾᇍ䈵ᅲ՟԰ЎϔϾখ᭄㹿Ӵ䗦ࠄᮍ ⊩ Ёᯊˈখ᭄ⱘؐህᰃᇍ䆹ᇍ䈵ⱘᓩ⫼DŽᇍ䈵ⱘݙᆍৃҹ೼㹿䇗⫼ⱘᮍ⊩ Ёᬍব Ԛˈᇍ䈵ⱘᓩ ⫼ᰃ∌䖰ϡӮᬍবⱘDŽ 47ǃᔧϔϾ㒓⿟䖯ܹϔϾᇍ䈵 ⱘϔϾ synchronized ᮍ⊩ৢˈ݊ ᅗ㒓⿟ᰃ৺ৃ䖯ܹℸᇍ䈵ⱘ݊ ᅗᮍ⊩? ϡ㛑ˈϔϾᇍ䈵ⱘϔϾ synchronized ᮍ⊩া㛑⬅ϔϾ㒓⿟䆓䯂DŽ 48ǃ 㓪⿟乬: ݭϔϾ Singleton ߎᴹDŽ Singleton ῵ᓣЏ㽕԰⫼ᰃֱ䆕೼ Java ᑨ⫼⿟ᑣЁˈϔϾ㉏ Class া᳝ϔϾᅲ՟ᄬ೼DŽ ϔ㠀 Singleton ῵ᓣ䗮ᐌ᳝޴⾡⾡ᔶᓣ: ㄀ϔ⾡ᔶᓣ: ᅮНϔϾ㉏ˈᅗⱘᵘ䗴ߑ᭄Ў private ⱘˈᅗ᳝ϔϾ static ⱘ private ⱘ䆹㉏ ব䞣ˈ೼㉏߱ྟ࣪ ᯊᅲ՟䆱ˈ䗮䖛ϔϾ public ⱘ getInstance ᮍ⊩㦋পᇍᅗⱘᓩ⫼,㒻 㗠䇗⫼ ݊ Ёⱘᮍ⊩DŽ public class Singleton { private Singleton(){} //೼㞾Ꮕݙ䚼ᅮН㞾ᏅϔϾᅲ՟ˈᰃϡᰃᕜ༛ᗾ˛ //⊼ᛣ䖭ᰃ private াկݙ䚼䇗⫼ private static Singleton instance = new Singleton(); //䖭䞠ᦤկњϔϾկ໪䚼䆓䯂ᴀ class ⱘ䴭ᗕᮍ⊩ˈৃҹⳈ᥹䆓䯂 public static Singleton getInstance() { return instance; } } ㄀Ѡ⾡ᔶᓣ: public class Singleton { private static Singleton instance = null; public static synchronized Singleton getInstance() { //䖭Ͼᮍ⊩↨Ϟ䴶᳝᠔ᬍ䖯ˈϡ⫼↣⃵ 䛑䖯㸠⫳៤ᇍ䈵ˈাᰃ㄀ϔ⃵ //Փ⫼ᯊ⫳៤ᅲ՟ˈᦤ催њᬜ⥛ʽ if (instance==null) instance˙new Singleton(); return instance; } } ݊ Ҫᔶᓣ: ᅮНϔϾ㉏ˈᅗⱘᵘ䗴ߑ᭄Ў private ⱘˈ᠔᳝ᮍ⊩Ў static ⱘDŽ ϔ㠀䅸Ў㄀ϔ⾡ᔶᓣ㽕᳈ࡴᅝܼѯ 49ǃJava ⱘ᥹ষ੠ C++ ⱘ㰮㉏ⱘⳌৠ੠ϡৠ໘DŽ ⬅Ѣ Java ϡᬃᣕ໮㒻ᡓˈ㗠᳝ৃ㛑ᶤϾ㉏៪ᇍ 䈵㽕Փ⫼ߚ߿೼޴Ͼ㉏៪ᇍ䈵䞠䴶ⱘᮍ⊩ ៪ሲᗻˈ⦄᳝ⱘऩ㒻ᡓᴎࠊህϡ 㛑⒵䎇㽕∖DŽϢ㒻ᡓⳌ↨ˈ᥹ষ᳝᳈催ⱘ♉⌏ᗻˈ಴Ў᥹ষ Ё≵᳝ӏԩᅲ ⦄ҷⷕDŽᔧϔϾ㉏ᅲ⦄њ᥹ষҹৢ 䆹ˈ㉏㽕ᅲ⦄᥹ষ䞠䴶᠔᳝ⱘᮍ⊩੠ሲᗻ ˈ ᑊϨ᥹ষ䞠䴶ⱘሲᗻ೼咬䅸⢊ᗕϟ䴶䛑ᰃ public static,᠔᳝ᮍ⊩咬䅸 ᚙމϟᰃ public.ϔϾ㉏ ৃ ҹᅲ⦄໮Ͼ᥹ষDŽ 50ǃJava Ёⱘᓖᐌ໘⧚ ᴎࠊⱘㅔऩॳ⧚੠ᑨ⫼DŽ ᔧ JAVA ⿟ᑣ䖱ডњ JAVA ⱘ䇁Н㾘߭ᯊ ˈJAVA 㰮ᢳᴎህӮᇚথ⫳ⱘ䫭䇃㸼⼎ЎϔϾᓖᐌDŽ 䖱ড䇁Н㾘߭ࣙᣀ 2 ⾡ᚙމDŽ ϔ⾡ᰃ JAVA ㉏ᑧݙ㕂ⱘ䇁НẔᶹDŽ՟བ᭄㒘ϟᷛ䍞⬠,Ӯᓩথ IndexOutOfBoundsException;䆓䯂 null ⱘᇍ䈵ᯊӮᓩথ NullPointerExceptionDŽ ঺ϔ⾡ᚙމህᰃ JAVA ܕ䆌⿟ᑣਬᠽሩ䖭⾡ 䇁НẔᶹˈ⿟ᑣਬৃҹ߯ᓎ㞾Ꮕⱘᓖᐌˈᑊ㞾⬅䗝ᢽ೼ԩᯊ⫼ throw ݇ 䬂 ᄫᓩথᓖᐌDŽ᠔᳝ⱘᓖᐌ䛑ᰃ java.lang.Thowable ⱘᄤ㉏DŽ 51ǃൗ ഒಲᬊⱘӬ⚍੠ॳ⧚DŽᑊ㗗㰥 2 ⾡ಲᬊᴎࠊDŽ Java 䇁㿔ЁϔϾᰒⴔⱘ⡍ ⚍ህᰃᓩܹњൗഒಲᬊᴎࠊˈՓ c++⿟ᑣਬ᳔༈⮐ⱘݙᄬㅵ⧚ⱘ 䯂乬䖢ߗ 㗠㾷ˈᅗՓᕫ Java ⿟ᑣਬ೼㓪ݭ⿟ᑣⱘᯊ׭ϡݡ䳔㽕㗗㰥ݙᄬㅵ⧚DŽ⬅ Ѣ᳝Ͼൗ ഒಲᬊᴎࠊˈ Java Ёⱘᇍ䈵ϡݡ᳝"԰⫼ඳ"ⱘὖᗉˈা᳝ᇍ䈵 ⱘᓩ⫼ᠡ᳝"԰⫼ඳ"DŽൗഒಲ ᬊৃҹ᳝ᬜⱘ䰆ℶݙᄬ⊘䴆 ˈ᳝ ᬜⱘՓ⫼ৃҹՓ⫼ⱘݙᄬDŽ ൗഒಲᬊ ఼䗮ᐌᰃ԰ЎϔϾऩ⣀ ⱘԢ㑻߿ⱘ㒓⿟䖤㸠 ˈϡৃ乘ⶹⱘᚙމϟᇍݙᄬේ ЁᏆ㒣⅏ѵⱘ៪㗙䭓ᯊ䯈≵᳝Փ⫼ⱘᇍ䈵 䖯㸠⏙Ἦ੠ಲᬊˈ⿟ᑣਬϡ㛑ᅲ ᯊⱘ䇗⫼ൗഒಲᬊ఼ᇍᶤϾᇍ䈵៪᠔᳝ᇍ䈵䖯㸠ൗഒಲᬊDŽ ಲᬊᴎࠊ᳝ߚ ҷ໡ࠊൗഒಲᬊ੠ᷛ䆄ൗഒಲᬊˈ๲䞣ൗഒಲᬊDŽ 52ǃ䇋䇈ߎԴ᠔ⶹ䘧ⱘ 㒓⿟ৠℹⱘᮍ⊩DŽ wait():ՓϔϾ㒓⿟໘Ѣㄝᕙ⢊ᗕˈᑊϨ䞞ᬒ᠔ᣕ᳝ⱘ ᇍ䈵ⱘ lockDŽ sleep(): Փ ϔ Ͼ ℷ ೼ 䖤㸠ⱘ 㒓 ⿟ ໘ Ѣ ⴵ ⳴ ⢊ ᗕ ˈ ᰃ ϔ Ͼ 䴭 ᗕ ᮍ ⊩ ˈ 䇗 ⫼ℸ ᮍ ⊩ 㽕 ᤩ ᤝ InterruptedException ᓖᐌDŽ notify():૸䝦ϔϾ໘Ѣㄝᕙ⢊ᗕⱘ 㒓⿟ˈ⊼ᛣⱘᰃ೼䇗⫼ℸᮍ⊩ⱘᯊ׭ˈᑊϡ㛑⹂ߛⱘ૸䝦 ᶤ ϔϾㄝᕙ⢊ᗕ ⱘ㒓⿟ˈ㗠ᰃ⬅ JVM ⹂ᅮ૸䝦ાϾ㒓⿟ˈ㗠ϨϡᰃᣝӬܜ㑻DŽ Allnotity():૸䝦᠔᳝໘ܹㄝᕙ⢊ᗕⱘ㒓⿟ ⊼ˈᛣᑊϡᰃ㒭᠔᳝૸䝦㒓⿟ ϔϾᇍ䈵ⱘ䫕 㗠ˈᰃ 䅽ᅗӀゲѝDŽ 53ǃԴ᠔ⶹ䘧ⱘ䲚ড়㉏䛑᳝ાѯ˛Џ㽕 ᮍ⊩˛ ᳔ ᐌ⫼ⱘ䲚ড়㉏ᰃ List ੠ MapDŽ List ⱘ݋ԧᅲ⦄ࣙᣀ ArrayList ੠ VectorˈᅗӀᰃৃব ໻ᇣⱘ߫㸼ˈ↨䕗䗖ড়ᵘᓎǃᄬټ ੠᪡԰ӏԩ㉏ൟᇍ䈵ⱘܗ㋴߫㸼DŽ List 䗖⫼Ѣᣝ᭄ؐ㋶ ᓩ䆓䯂ܗ㋴ⱘᚙ ᔶDŽ Map ᦤկњϔϾ᳈䗮⫼ⱘܗ㋴ᄬټᮍ⊩DŽ Map 䲚ড়㉏⫼Ѣᄬټܗ㋴ ᇍ ˄ ⿄԰"䬂"੠"ؐ" ˅ˈ ݊ Ё↣Ͼ䬂᯴ᇘࠄϔϾؐDŽ 54ǃᦣ䗄ϔϟ JVM ࡴ䕑 class ᭛ӊⱘॳ⧚ᴎࠊ? JVM Ё㉏ⱘ㺙䕑ᰃ⬅ ClassLoader ੠ᅗ ⱘᄤ㉏ᴹᅲ⦄ⱘ,Java ClassLoader ᰃϔϾ䞡㽕ⱘ Java 䖤㸠ᯊ㋏㒳㒘 ӊDŽᅗ䋳䋷೼䖤㸠ᯊᶹᡒ੠㺙ܹ㉏᭛ӊⱘ㉏DŽ 55ǃchar ൟব䞣Ё㛑ϡ㛑 ᄬ䌂ϔϾЁ᭛∝ᄫ?ЎҔМ? 㛑໳ᅮН៤ЎϔϾЁ᭛ⱘˈ಴Ў java Ёҹ unicode 㓪ⷕˈϔϾ char ऴ 16 Ͼᄫ㡖ˈ᠔ҹᬒ ϔϾЁ᭛ᰃ≵䯂乬ⱘ 56ǃ໮㒓⿟᳝޴⾡ᅲ⦄ᮍ⊩,䛑ᰃҔМ?ৠℹ᳝޴⾡ᅲ⦄ᮍ⊩,䛑ᰃҔМ? ໮ 㒓⿟᳝ϸ⾡ᅲ⦄ᮍ⊩ˈߚ߿ᰃ㒻ᡓ Thread ㉏Ϣᅲ⦄ Runnable ᥹ষ ৠ ℹⱘᅲ⦄ᮍ䴶᳝ϸ⾡ ˈߚ߿ᰃ synchronized,wait Ϣ notify 57ǃJSP ⱘݙ㕂ᇍ䈵ঞᮍ⊩DŽ request 㸼⼎ HttpServletRequest ᇍ䈵DŽᅗࣙ ৿њ᳝݇⌣㾜఼䇋∖ⱘֵᙃ ᑊˈϨᦤկњ޴Ͼ ⫼Ѣ㦋প cookie, header, ੠ session ᭄᥂ⱘ᳝⫼ⱘᮍ⊩DŽ response 㸼⼎ HttpServletResponse ᇍ䈵ˈ ᑊᦤկњ޴Ͼ⫼Ѣ䆒㕂䗕ಲ⌣㾜఼ⱘડ ᑨⱘᮍ ⊩˄བ cookies,༈ֵᙃㄝ˅ out ᇍ䈵ᰃ javax.jsp.JspWriter ⱘϔϾᅲ՟ˈᑊᦤկњ޴Ͼᮍ⊩ՓԴ㛑⫼Ѣ৥⌣ 㾜఼ಲ䗕 䕧ߎ㒧ᵰDŽ pageContext 㸼⼎ϔϾ javax.servlet.jsp.PageContext ᇍ䈵DŽᅗᰃ⫼Ѣᮍ֓ᄬপ৘⾡㣗ೈ ⱘ ৡᄫぎ䯈ǃservlet Ⳍ݇ⱘᇍ䈵ⱘ APIˈᑊϨࣙ㺙њ䗮⫼ⱘ servlet Ⳍ݇ࡳ㛑ⱘᮍ⊩DŽ session 㸼⼎ϔϾ䇋∖ⱘ javax.servlet.http.HttpSessionᇍ䈵DŽ Session ৃ ҹᄬ䌂⫼᠋ⱘ ⢊ᗕ ֵ ᙃ applicaton 㸼⼎ϔϾ javax.servle.ServletContext ᇍ䈵DŽ 䖭᳝ࡽѢᶹᡒ᳝݇ servlet ᓩ᪢੠ servlet ⦃๗ⱘֵᙃ config 㸼⼎ ϔϾ javax.servlet.ServletConfig ᇍ䈵DŽ䆹ᇍ䈵⫼Ѣᄬপ servlet ᅲ՟ⱘ߱ྟ࣪ খ᭄DŽ page 㸼⼎Ң䆹义䴶ѻ⫳ⱘϔϾ servlet ᅲ՟ 58ǃ㒓⿟ⱘ෎ᴀὖᗉǃ㒓⿟ⱘ෎ᴀ⢊ᗕҹঞ⢊ᗕП䯈ⱘ݇㋏ 㒓⿟ᣛ೼ ⿟ᑣᠻ㸠䖛⿟Ёˈ 㛑໳ᠻ㸠⿟ᑣҷⷕⱘϔϾᠻ㸠ऩԡ ˈ↣Ͼ⿟ᑣ㟇ᇥ䛑᳝ ϔϾ㒓 ⿟ˈгህᰃ⿟ᑣᴀ䑿DŽ Java Ёⱘ㒓⿟᳝ಯ⾡⢊ᗕߚ߿ᰃ˖䖤㸠ǃ ህ㒾ǃᣖ䍋ǃ㒧ᴳDŽ 59ǃJSP ⱘᐌ⫼ᣛҸ <%@page language="java" contenType="text/html;charset=gb2312" session="true" buffer="64kb" autoFlush="true" isThreadSafe="true" info="text" errorPage="error.jsp" isErrorPage="true" isELIgnored="true" pageEncoding="gb2312" import="java.sql.*"%> isErrorPage(ᰃ৺㛑Փ⫼ Exception ᇍ 䈵)ˈisELIgnored(ᰃ৺ᗑ⬹㸼䖒ᓣ) <%@include file="filename"%> <%@taglib prefix="c"uri="http://……"%> 60ǃҔМᚙމϟ䇗⫼ doGet()੠ doPost()˛ Jsp 义䴶Ёⱘ form ᷛ ㅒ䞠ⱘ method ሲᗻЎ get ᯊ䇗⫼ doGet()ˈЎ post ᯊ䇗⫼ doPost()DŽ 61ǃservlet ⱘ⫳ੑ਼ᳳ web ᆍ఼ࡴ䕑 servletˈ ⫳ੑ ਼ᳳᓔྟDŽ 䗮䖛䇗⫼ servlet ⱘ init()ᮍ⊩䖯㸠 servlet ⱘ߱ྟ࣪DŽ 䗮䖛䇗⫼ service()ᮍ⊩ᅲ⦄ˈḍ᥂䇋∖ⱘϡৠ䇗⫼ϡৠⱘ do***()ᮍ ⊩DŽ㒧ᴳ᳡ࡵˈweb ᆍ ఼䇗⫼ servlet ⱘ destroy()ᮍ⊩DŽ 62ǃབ ԩ⦄ᅲ servlet ⱘऩ㒓⿟῵ᓣ <%@ page isThreadSafe="false"%> 63ǃ义䴶䯈ᇍ䈵Ӵ䗦ⱘᮍ⊩ request sˈession aˈpplication cˈookie ㄝ 64ǃJSP ੠ Servlet ᳝ ાѯⳌৠ⚍੠ϡৠ⚍ ҪˈӀП䯈ⱘ㘨㋏ᰃҔМ˛ JSP ᰃ Servlet ᡔᴃⱘᠽሩˈᴀ䋼Ϟᰃ Servlet ⱘㅔᯧᮍᓣˈ᳈ᔎ䇗 ᑨ⫼ⱘ໪㸼㸼䖒DŽJSP 㓪䆥ৢᰃ"㉏ servlet"DŽServlet ੠ JSP ᳔ Џ 㽕ⱘϡৠ⚍೼ѢˈServlet ⱘᑨ⫼䘏䕥ᰃ೼ Java ᭛ӊ ЁˈᑊϨᅠܼҢ 㸼⼎ሖЁⱘ HTML 䞠ߚ⾏ᓔᴹDŽ㗠 JSP ⱘᚙމᰃ Java ੠ HTML ৃ ҹ㒘 ড়៤ϔ ϾᠽሩৡЎ.jsp ⱘ᭛ӊDŽJSP ջ䞡Ѣ㾚೒ˈServlet Џ㽕⫼Ѣ ᥻ࠊ䘏䕥DŽ 65ǃಯ⾡Ӯ䆱䎳䏾ᡔᴃ Ӯ䆱԰⫼ඳ ServletsJSP 义䴶ᦣ䗄 page ৺ᰃҷ㸼ϢϔϾ义䴶Ⳍ݇ⱘᇍ䈵੠ሲᗻDŽϔϾ义䴶⬅ϔϾ㓪䆥དⱘ Java servlet ㉏˄ৃ ҹᏺ᳝ӏԩⱘ include ᣛҸˈԚᰃ≵᳝ include ࡼ԰˅㸼⼎DŽ䖭 ᮶ࣙᣀ servlet জࣙᣀ㹿㓪 䆥៤ servlet ⱘ JSP 义䴶 request ᰃ ᰃҷ㸼Ϣ Web ᅶ᠋ᴎথߎⱘϔϾ䇋∖Ⳍ݇ⱘᇍ䈵੠ሲᗻDŽϔϾ䇋∖ৃ㛑䎼 䍞໮ Ͼ义䴶ˈ⍝ঞ໮Ͼ Web 㒘ӊ˄⬅Ѣ forward ᣛҸ੠ include ࡼ ԰ⱘ݇㋏˅ session ᰃᰃҷ㸼Ϣ⫼ѢᶤϾ Web ᅶ᠋ᴎⱘϔϾ⫼᠋ԧ偠Ⳍ ݇ⱘᇍ䈵੠ሲᗻDŽ ϔϾ Web Ӯ 䆱ৃҹг㒣ᐌӮ䎼䍞໮Ͼᅶ᠋ᴎ䇋∖ application ᰃᰃҷ㸼ϢᭈϾ Web ᑨ⫼⿟ᑣⳌ݇ⱘᇍ䈵੠ሲᗻDŽ䖭ᅲ䋼 Ϟᰃ䎼䍞ᭈϾ Web ᑨ⫼⿟ᑣˈࣙᣀ໮Ͼ义䴶ǃ䇋∖੠Ӯ䆱ⱘϔϾܼሔ԰⫼ ඳ 66ǃRequest ᇍ䈵ⱘЏ㽕ᮍ⊩˖ setAttribute(String name,Object)˖䆒㕂ৡᄫЎ name ⱘ request ⱘখ᭄ؐ getAttribute(String name)˖䖨ಲ⬅ name ᣛᅮⱘሲᗻؐ getAttributeNames()˖䖨ಲ request ᇍ䈵᠔᳝ሲᗻⱘৡᄫ䲚ড়ˈ㒧 ᵰᰃϔϾᵮВⱘᅲ՟ getCookies()˖䖨ಲᅶ᠋ッⱘ᠔᳝ Cookie ᇍ䈵ˈ 㒧ᵰᰃϔϾ Cookie ᭄㒘 getCharacterEncoding()˖䖨ಲ䇋∖Ёⱘ ᄫヺ㓪ⷕᮍᓣ getContentLength()˖䖨ಲ䇋∖ⱘ Body ⱘ䭓ᑺ getHeader(String name)˖㦋ᕫ HTTP ण䆂ᅮНⱘ᭛ӊ༈ֵᙃ getHeaders(String name)˖ 䖨ಲᣛᅮৡᄫⱘ request Header ⱘ ᠔᳝ؐˈ 㒧ᵰᰃϔϾᵮВⱘᅲ՟ getHeaderNames()˖䖨ಲ᠔ҹ request Header ⱘৡᄫˈ㒧ᵰᰃϔϾᵮВⱘᅲ՟ getInputStream()˖ 䖨ಲ䇋∖ⱘ䕧ܹ⌕ ⫼ˈѢ㦋ᕫ䇋∖Ёⱘ᭄᥂ getMethod() 㦋˖ᕫᅶ᠋ッ৥ ᳡ࡵ఼ッӴ䗕᭄᥂ⱘᮍ⊩ getParameter(String name)˖㦋ᕫᅶ᠋ッ Ӵ䗕㒭᳡ࡵ఼ッⱘ᳝ name ᣛᅮⱘখ᭄ؐ getParameterNames()˖㦋 ᕫᅶ᠋ッӴ䗕㒭᳡ࡵ఼ッⱘ᠔᳝খ᭄ⱘৡᄫˈ㒧ᵰᰃϔϾᵮВⱘᅲ ՟ getParameterValues(String name)˖㦋ᕫ᳝ name ᣛᅮⱘখ᭄ⱘ᠔ ᳝ؐ getProtocol()˖㦋পᅶ᠋ッ৥᳡ࡵ఼ッӴ䗕᭄᥂᠔ձ᥂ⱘण䆂ৡ ⿄ getQueryString()˖㦋ᕫᶹ䆶ᄫヺІ getRequestURI()˖㦋পথ ߎ䇋∖ᄫヺІⱘᅶ᠋ッഄഔ getRemoteAddr()˖㦋পᅶ᠋ッⱘ IP ഄഔ getRemoteHost()˖㦋পᅶ᠋ッⱘৡᄫ getSession([Boolean create])˖䖨ಲ੠䇋∖Ⳍ݇ Session getServerName()˖㦋প᳡ࡵ఼ ⱘৡᄫ getServletPath()˖㦋পᅶ᠋ッ᠔䇋∖ⱘ㛮ᴀ᭛ӊⱘ䏃ᕘ getServerPort()˖㦋প᳡ࡵ఼ⱘッষো removeAttribute(String name)˖ߴ䰸䇋∖ЁⱘϔϾሲᗻ 67ǃJ2EE ᰃᡔᴃ䖬ᰃᑇৄ䖬ᰃḚᶊ˛ J2EE ᴀ䑿ᰃϔϾᷛޚˈϔϾЎӕϮߚᏗᓣᑨ⫼ⱘᓔথᦤկⱘᷛޚᑇৄDŽ J2EE гᰃϔϾḚᶊˈࣙᣀ JDBCǃJNDIǃRMIǃJMSǃEJBǃJTA ㄝᡔᴃDŽ 68ǃ៥Ӏ೼ web ᑨ⫼ᓔথ䖛⿟Ё㒣ᐌ䘛ࠄ䕧ߎᶤ⾡㓪ⷕⱘᄫヺˈབ iso8859-1 ㄝˈབԩ䕧ߎ ϔϾᶤ⾡㓪ⷕⱘᄫヺІ˛ Public String translate (String str) { String tempStr = ""; try { tempStr = new String(str.getBytes("ISO-8859-1"), "GBK"); tempStr = tempStr.trim(); } catch (Exception e) { System.err.println(e.getMessage()); } return tempStr; } 69ǃㅔ䗄䘏䕥᪡԰(&,|,^)Ϣᴵӊ᪡԰(&&,||)ⱘऎ߿DŽ ऎ߿Џ㽕ㄨ ϸ⚍ ˖a.ᴵӊ᪡԰া㛑᪡԰Ꮧᇨൟⱘ,㗠䘏䕥᪡԰ϡҙৃҹ᪡԰Ꮧᇨൟ,㗠 Ϩৃҹ᪡԰᭄ؐൟ b.䘏䕥᪡԰ϡӮѻ⫳ⷁ䏃 70ǃXML ᭛ḷᅮН᳝޴⾡ᔶ ᓣ˛ᅗӀП䯈᳝ԩᴀ䋼ऎ߿˛㾷ᵤ XML ᭛ḷ᳝ા޴⾡ᮍᓣ˛ a: ϸ⾡ᔶᓣ dtd schemaˈ ᴀ䋼ऎ߿:schema ᴀ䑿ᰃ xml ⱘˈ b: ৃ ҹ㹿 XML 㾷 ᵤ఼㾷ᵤ(䖭г ᰃҢ DTD Ϟথሩ schema ⱘḍᴀⳂⱘ)ˈc:᳝ DOM,SAX,STAX ㄝ DOM:໘⧚໻ൟ᭛ӊᯊ݊ᗻ㛑ϟ䰡ⱘ䴲ᐌढ़ᆇDŽ䖭Ͼ䯂 乬ᰃ⬅ DOM ⱘᷥ㒧ᵘ᠔䗴៤ⱘ ˈ䖭⾡㒧ᵘऴ⫼ⱘݙᄬ䕗໮ ˈ㗠Ϩ DOM ᖙ 乏೼㾷ᵤ᭛ӊПࠡᡞᭈϾ᭛ḷ㺙ܹݙᄬ,䗖ড়ᇍ XML ⱘ䱣ᴎ䆓䯂 SAX:ϡ ⦄Ѣ DOM,SAX ᰃџӊ偅ࡼൟⱘ XML 㾷ᵤᮍᓣDŽᅗ乎ᑣ䇏প XML ᭛ӊˈ ϡ䳔㽕ϔ⃵ܼ 䚼㺙䕑ᭈϾ᭛ӊDŽᔧ䘛ࠄڣ᭛ӊᓔ༈ˈ᭛ḷ㒧ᴳˈ៪㗙ᷛㅒ ᓔ༈Ϣᷛㅒ㒧ᴳᯊˈᅗӮ㾺থϔ Ͼџӊˈ⫼᠋䗮䖛೼݊ಲ䇗џӊЁݭܹ໘ ⧚ҷⷕᴹ໘⧚ XML ᭛ӊˈ䗖ড়ᇍ XML ⱘ乎ᑣ䆓䯂 STAX:Streaming API for XML (StAX) 71ǃㅔ䗄 synchronized ੠ java.util.concurrent.locks.Lock ⱘᓖৠ˛ Џ㽕Ⳍৠ⚍˖Lock 㛑 ᅠ៤ synchronized ᠔ᅲ⦄ⱘ᠔᳝ࡳ㛑 Џ㽕ϡৠ⚍˖Lock ᳝ ↨ synchronized ᳈㊒⹂ⱘ㒓⿟䇁Н੠᳈དⱘᗻ㛑DŽsynchronized Ӯ㞾 ࡼ 䞞ᬒ䫕ˈ㗠 Lock ϔᅮ㽕∖⿟ᑣਬ᠟Ꮉ䞞ᬒˈᑊϨᖙ乏೼ finally Ң হЁ䞞ᬒDŽ 72ǃEJB ⱘ㾦㡆੠ϝϾᇍ䈵 ϔϾᅠᭈⱘ෎Ѣ EJB ⱘߚᏗᓣ 䅵ㅫ㒧ᵘ⬅݁Ͼ㾦㡆㒘៤ ˈ䖭݁Ͼ㾦㡆ৃҹ⬅ϡৠⱘᓔথଚ ᦤկˈ↣Ͼ㾦 㡆᠔԰ⱘᎹ԰ᖙ乏䙉ᕾ Sun ݀ ৌᦤկⱘ EJB 㾘㣗ˈҹֱ䆕ᕐℸП䯈ⱘݐ ᆍᗻDŽ 䖭݁Ͼ㾦㡆ߚ߿ᰃ EJB 㒘ӊᓔথ㗙˄Enterprise Bean Provider˅ ǃᑨ⫼㒘ড়㗙˄Application Assembler˅ ǃ䚼㕆㗙 ˄Deployer˅ ǃEJB ᳡ࡵ఼ᦤկ㗙˄EJB Server Provider˅ ǃEJB ᆍ఼ᦤկ㗙 ˄ EJB Container Provider˅ ǃ㋏㒳ㅵ⧚ਬ˄System Administrator˅ ϝϾᇍ䈵ᰃ Remote˄Local˅᥹ষǃHome ˄LocalHome˅᥹ষˈBean ㉏ 73ǃEJB ᆍ఼ᦤկⱘ᳡ࡵ Џ㽕ᦤկໄᯢ ਼ᳳㅵ⧚ǃ ҷⷕѻ⫳ǃ ᣕ㓁ᗻㅵ⧚ǃ ᅝܼǃ џࡵㅵ⧚ǃ 䫕੠ᑊথ㸠ㅵ ⧚ㄝ᳡ࡵDŽ 74ǃEJB 㾘㣗㾘ᅮ EJB Ё⽕ℶⱘ᪡԰᳝ાѯ˛ 1.ϡ㛑᪡԰㒓⿟੠㒓 ⿟ API(㒓⿟ API ᣛ䴲㒓⿟ᇍ䈵ⱘᮍ⊩བ notify,wait ㄝ)ˈ 2.ϡ㛑 ᪡԰ awtˈ 3.ϡ㛑ᅲ⦄᳡ࡵ఼ࡳ㛑ˈ 4.ϡ㛑ᇍ䴭ᗕሲ⫳ᄬপˈ 5.ϡ㛑 Փ⫼ IO ᪡԰Ⳉ᥹ᄬপ᭛ӊ㋏㒳ˈ 6.ϡ㛑ࡴ䕑ᴀഄᑧ.ˈ 7.ϡ㛑ᇚ this ԰Ўব䞣੠䖨ಲˈ 8.ϡ㛑ᕾ⦃䇗⫼DŽ 75ǃremote ᥹ষ੠ home ᥹ষЏ 㽕԰⫼ remote ᥹ষᅮНњϮࡵᮍ⊩ˈ⫼Ѣ EJB ᅶ᠋ッ䇗⫼Ϯࡵᮍ⊩DŽ home ᥹ষᰃ EJB Ꮉॖ⫼Ѣ߯ᓎ੠⿏䰸ᶹᡒ EJB ᅲ՟ 76ǃbean ᅲ՟ⱘ ⫳ੑ਼ᳳ ᇍѢ Stateless Session BeanǃEntity BeanǃMessage Driven Bean ϔ㠀ᄬ೼㓧ކ∴ㅵ⧚ˈ㗠ᇍ Ѣ Entity Bean ੠ Statefull Session Bean ᄬ೼ Cache ㅵ⧚ˈ䗮ᐌࣙ৿߯ᓎᅲ՟ˈ䆒 㕂Ϟϟ᭛ǃ ߯ ᓎ EJB Object˄create˅ ǃϮࡵᮍ⊩䇗⫼ǃremove ㄝ 䖛⿟ˈᇍѢᄬ೼㓧ކ∴ㅵ⧚ⱘ Beanˈ ೼ create Пৢᅲ՟ᑊϡҢݙᄬ⏙ 䰸ˈ㗠ᰃ䞛⫼㓧ކ∴䇗ᑺᴎࠊϡᮁ䞡⫼ᅲ՟ˈ㗠ᇍѢᄬ೼ Cache ㅵ⧚ⱘ Bean ߭ 䗮䖛▔⌏੠এ▔⌏ᴎࠊֱᣕ Bean ⱘ⢊ᗕᑊ䰤ࠊݙᄬЁᅲ՟᭄䞣DŽ 77ǃEJB ⱘ▔⌏ᴎࠊ ҹ Stateful Session Bean Ў՟˖ Cache ໻ ᇣއᅮњݙᄬЁৃҹৠᯊᄬ೼ⱘ Bean ᅲ՟ⱘ᭄ ݊ 䞣ˈḍ᥂ MRU ៪ NRU ㅫ⊩ˈᅲ՟೼▔⌏੠এ▔⌏⢊ᗕП䯈䖕⿏ˈ▔⌏ᴎࠊᰃᔧᅶ᠋ッ䇗⫼ ᶤ Ͼ EJB ᅲ՟Ϯࡵᮍ⊩ᯊˈབᵰᇍᑨ EJB Object থ⦄㞾Ꮕ≵᳝㒥ᅮᇍᑨⱘ Bean ᅲ՟߭Ң݊ এ▔⌏ Bean ᄬټЁ˄䗮䖛ᑣ߫࣪ᴎࠊᄬټᅲ՟˅ಲ໡ ˄▔⌏˅ℸᅲ՟DŽ⢊ᗕব䖕ࠡӮ䇗⫼ ᇍᑨⱘ ejbActive ੠ ejbPassivate ᮍ⊩DŽ 78ǃEJB ⱘ޴⾡㉏ൟ Ӯ䆱˄Session˅Bean ˈ ᅲԧ˄Entity˅Bean ⍜ᙃ偅ࡼⱘ˄Message Driven˅Bean Ӯ䆱 Bean জৃߚЎ᳝⢊ᗕ˄ Stateful ੠˅᮴⢊ᗕ˄ Stateless ϸ˅⾡ ᅲԧ Bean ৃ ߚЎ Bean ㅵ⧚ⱘᣕ㓁ᗻ˄BMP˅੠ᆍ఼ㅵ⧚ⱘᣕ㓁ᗻ˄CMP˅ϸ⾡ 79ǃ ᅶ᳡ッ䇗⫼ EJB ᇍ䈵ⱘ޴Ͼ෎ᴀℹ偸 䆒㕂 JNDI ᳡ࡵᎹॖҹঞ JNDI ᳡ ࡵഄഔ㋏㒳ሲᗻˈ ᶹ ᡒ Home ᥹ষˈ Home ᥹ষ䇗⫼ Create Ң ᮍ⊩ ߯ᓎ Remote ᥹ষˈ䗮䖛 Remote ᥹ষ䇗⫼݊Ϯࡵᮍ⊩DŽ 80ǃབԩ㒭 weblogic ᣛᅮ໻ᇣⱘݙᄬ? ೼ਃࡼ Weblogic ⱘ㛮ᴀЁ˄ԡѢ᠔೼ Domian ᇍᑨ᳡ࡵ఼Ⳃᔩϟⱘ startServerName˅ ˈ ๲ ࡴ set MEM_ARGS=-Xms32m -Xmx200mˈৃҹ䇗ᭈ᳔ᇣݙᄬЎ 32Mˈ᳔໻ 200M 81ǃབԩ䆒ᅮⱘ weblogic ⱘ⛁ਃࡼ῵ᓣ(ᓔথ῵ᓣ)ϢѻકথᏗ῵ᓣ? ৃ ҹ೼ㅵ⧚᥻ࠊৄЁׂᬍᇍᑨ᳡ࡵ఼ⱘਃࡼ῵ᓣЎᓔথ៪ѻક῵ᓣПϔDŽ ៪ 㗙ׂᬍ᳡ࡵⱘਃ ࡼ᭛ӊ៪㗙 commenv ᭛ӊˈ๲ࡴ set PRODUCTION_MODE=trueDŽ 82ǃབԩਃࡼᯊϡ䳔䕧ܹ⫼᠋ৡϢᆚⷕ? ׂ ᬍ᳡ࡵਃࡼ᭛ӊˈ๲ࡴ WLS_USER ੠ WLS_PW 乍DŽгৃҹ೼ boot.properties ᭛ӊЁ๲ ࡴ ࡴᆚ䖛ⱘ⫼᠋ৡ੠ᆚⷕ. 83ǃ weblogic ㅵ⧚ࠊৄЁᇍϔϾᑨ⫼ඳ(៪㗙 䇈ᰃϔϾ㔥キ,Domain)䖯㸠 jms ঞ ejb ៪䖲᥹ ೼ ∴ㄝⳌֵ݇ᙃ䖯㸠 䜡㕂ৢ,ᅲ䰙ֱᄬ೼ҔМ᭛ӊЁ? ֱᄬ೼ℸ Domain ⱘ config.xml ᭛ ӊЁ ᅗˈᰃ᳡ࡵ఼ⱘḌᖗ䜡㕂᭛ӊDŽ 84ǃ䇈䇈 weblogic ЁϔϾ Domain ⱘ㔎ⳕⳂᔩ㒧ᵘ?↨བ㽕ᇚϔϾㅔऩⱘ helloWorld.jsp ᬒܹ ԩⳂᔩϟ, ✊ⱘ೼⌣㾜఼Ϟህৃᠧܹ http://Џᴎ:ッষো//helloword.jsp ህৃ ҹⳟࠄ䖤㸠㒧ᵰ њ? জ↨བ䖭݊Ё⫼ࠄњϔϾ㞾Ꮕݭⱘ javaBean 䆹བ ԩࡲ? Domain Ⳃᔩ᳡ࡵ఼Ⳃᔩ applicationsˈᇚᑨ⫼Ⳃᔩᬒ೼ℸⳂᔩ ϟᇚৃҹ԰Ўᑨ⫼䆓䯂ˈབ ᵰᰃ Web ᑨ⫼ˈ ᑨ⫼Ⳃᔩ䳔㽕⒵䎇 Web ᑨ ⫼Ⳃᔩ㽕∖ˈ ᭛ӊৃҹⳈ᥹ᬒ೼ᑨ⫼ⳂᔩЁˈ jsp Javabean 䳔㽕ᬒ೼ ᑨ⫼Ⳃᔩⱘ WEB-INF Ⳃ