java_java se知识点记录new

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1、ᓔ䇒⊼ᛣџ乍/ܹᄺ㟈䆡Փ⫼NetMeetingᓔྟ-䖤㸠-conf䞡ᮄਃࡼ/ⱏ䰚߿Ҏᴎ఼ᶹⳟ㞾ᏅIP㔥Ϟ䚏ሙ-ሲᗻ-TCP/IP-ሲᗻҸ㸠-ipconfigҸᦤ⼎ヺㅔऩՓ⫼cddird:⦃๗ব䞣䆒㕂៥ⱘ⬉㛥-ሲᗻ-催㑻-⦃๗ব䞣⫼᠋ব䞣-㋏㒳ব䞣ⱘऎ߿Path⫼ߚো䱨ᓔˈᑨ⫼⿟ᑣⱘ䏃ᕘˈᠻ㸠ϔϾҸᯊˈ佪ܜᡒᔧࠡ䏃ᕘˈ✊ৢᡒ⫼᠋Pathˈ᳔ৢᡒ㋏㒳Path⿟ᑣਬⱘ䆒㕂䆺㒚ᙃᰒ⼎᭛ӊϡ㽕䱤㮣᭛ӊᠽሩৡᰒ⼎᠔᳝᭛ӊഄഔᷣᰒ⼎ᅠᭈ䏃ᕘᷛ乬ᷣᰒ⼎ᅠᭈ䏃ᕘᰒ⼎䆺㒚߫㸼ᑨ⫼ࠄ᠔᳝᭛ӊ།བԩҢ㗕Ꮬᴎ఼Ϟᣓ᭛ӊf

2、tp://192.168.0.1JDKᅝ㺙JDKJREⱘὖᗉJ2SDKHelloWorld԰Ϯ˖䯙䇏aviϟ䴶ⱘ㾚乥ᓘᯢⱑclasspathⱘ৿Н㽕䏣ᅲˈ㽕ᬶѢ䇗䆩䫭䇃ˈ㽕ᬶѢՓ⫼䕃ӊ1㄀ϔゴJavaⱘ䖤㸠䖛⿟java-class-ClassLoader(lazyload)-᷵偠఼(verifier)-㾷䞞఼(interpreter)Ḍᖗᴎࠊ˖JVM(CompileOnce,RunAnywhere)ߚሖⱘᗱᛇGarbageCollector(GC)ϡ㛑㊒⹂᥻ࠊϔ㠀ⱘ䆒䅵ᮍ⊩ᰃ↣䱨ϔ↉ᯊ䯈ᠻ㸠ϔ⃵

3、ᗢМḋ⹂ᅮાഫݙᄬᰃൗഒ≵᳝ᓩ⫼ᣛ৥ⱘ⣀ᇍ䈵ϡ㛑ϡಲᬊˈгϡ㛑ಲᬊϸ⃵classpathpathᰃ᪡԰㋏㒳⫼ⱘclasspathᰃJVM⫼ᴹᇏᡒ㉏⫼ⱘ⦃๗ব䞣.䏃ᕘҷ㸼ᔧࠡ䏃ᕘjavaclass佪ܜᖙ乏ᅮН㉏㉏䞠䴶៤ਬব䞣ᮍ⊩䇁হ㉏××××԰Ϯ˖⿟ᑣḐᓣⱘ㾚乥HelloWorldonepublicclassinajavafilezeroormanynon-publicclassinajavafilepublicclassname=filenameErrorCompileTimeErrorRunt

4、imeErrorᇍᕙ䫭䇃ⱘᗕᑺ1˖Ҩ㒚䯙䇏2˖ᗱ㗗ᴹ啭এ㛝3˖ࡼ᠟䇗䆩㾷އSystem.out.printlnߴᥝϔ↉ᬍϔ↉Ңㅔऩࠄ໡ᴖⱘ䇗䆩4˖google5˖BBS6˖teacher2㄀Ѡゴᷛ䆚ヺ㾕ৡⶹНˈ㾘߭ϡ⫼䆄݇䬂ᄫᐌ䞣ব䞣ሔ䚼ব䞣˄ᮍ⊩ݙ䚼ໄᯢˈࣙᣀᔶখ˅ǃ៤ਬব䞣˄ᮍ⊩໪ˈ㉏ݙ䚼˅booleantruefalsecharUnicode㓪ⷕ˄utf-16ˈϸϾᄫ㡖ϔϾᄫヺ˅Ѡ䖯ࠊ/क䖯ࠊ/16䖯ࠊⱘ䕀ᤶᭈൟbyteshortint(咬䅸)long⍂⚍ൟfloatdouble(defa

5、ult)ϡ㊒⹂䫊㸠ϔ㠀⫼BigDecimalݙᄬߚऎcode-ᄬᬒҷⷕdata-䴭ᗕব䞣ᄫヺІᐌ䞣stack-ሔ䚼ব䞣heap-newߎᴹⱘϰ㽓෎⸔᭄᥂㉏ൟ䕀ᤶbooleanϡ䕀咬䅸䕀ᤶbyteshortcharϡ䕀ˈ䖤ㅫᯊ㞾ࡼ䕀intˈৃҹⳈ᥹⫼᭄䌟ؐˈϡ䍙㣗ೈेৃint-long-float-doubleᔎࠊ䕀ᤶࠡ䴶ࡴ(㉏ൟৡ)ˈᇣᖗᑨ⫼ˈӮᇐ㟈㊒ᑺ㔎༅䖤ㅫヺ+-*/%++--˄೼ࠡˈ೼ৢ˅݇㋏䖤ㅫ><>=<===!=䘏䕥䖤ㅫ&

6、!^&&

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8、˄䘏䕥Ϣⷁ䏃ⱘऎ߿˅ԡ䖤ㅫ&ϸ㗙䛑ᰃ1ˈ㒧ᵰ1

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10、ϔϾЎ1ˈ㒧ᵰ1~পড^ⳌᓖЎ1>>ে⿏ˈᎺ䖍㸹ܙヺোԡˈⳌᔧѢ/2<<Ꮊ⿏ˈে䖍㸹䳊ˈⳌᔧѢ*2>>>᮴ヺোে⿏ˈᎺ䖍㸹䳊䌟ؐ=ᠽሩ+=-=……ᄫヺІ䖲᥹+ϸջ᭄ϔϾЎStringᯊˈ঺໪ϔϾ㞾ࡼ䕀ЎString㸼䖒ᓣ㒧ᵰ㉏ൟӬܜ㑻˄ϡ⫼䆄˅ϝⳂx?y:zif䇁হা᳝ϔহ䆱㽕ᠻ㸠ⱘᯊ׭ˈৃҹⳕ⬹{}ϡ᥼㤤ⳕ⬹3ϡ㽕ݭ៤if(..);for(..;..;..)ϝϾ㸼䖒ᓣ䛑ৃҹⳕ⬹while..dowhile();ৢ䴶᳝ߚোbreakcontinue䅵ㅫ1!+2!+……+10!䅵ㅫ1..100ࠡѨ

11、Ͼৃҹ㹿3ᭈ䰸ⱘ᭄䅵ㅫ101..200ݙⱘ䋼᭄switch䇁হᇣᖗcaseこ䗣ⱘ䯂乬ˈՓ⫼break䇁হᮍ⊩䇗⫼ⱘ䖛⿟1˖ߚ䜡ᔶখⱘぎ䯈ߚ䜡Јᯊ䖨ಲؐぎ䯈˄བᵰ᳝ⱘ䆱˅䆄ᔩϟϔℹ⿟ᑣⱘᠻ㸠ഄഔ2˖ᡞᅲখؐcopy㒭ᔶখ3˖ᮍ⊩ᓔྟᠻ㸠4˖ᠻ㸠ᅠ↩ৢˈ䞞ᬒሔ䚼ব䞣ⱘぎ䯈ݙᄬҢmainᮍ⊩ᓔྟߚᵤ䗦ᔦݙᄬЁⱘߚᵤᮍ⊩䗦ᔦЁখ᭄ⱘ⹂ᅮ↨䕗䞡㽕Fab᭄߫ⱘ䯂乬˄䗦ᔦǃ䴲䗦ᔦ˅⿟ᑣᗱ䏃ⱘᅠ៤໮䇏໮ࡼ᠟ݭ⿟ᑣʽʽʽ⿟ᑣⱘḐᓣ㽕ད㽕剕Ầᇍ䕧ܹ䖯㸠߸ᮁܼ䴶㗗㰥৘⾡ᚙމ4㄀ϝゴ䴶৥ᇍ䈵ⱘϝϾ⡍ᕕ1˖ᇕ㺙2˖㒻ᡓ3

12、˖໮ᗕ㉏ᶤϔ㉏џ⠽ⱘ݅ৠ⡍ᕕⱘᢑ䈵˄䴭ᗕ੠ࡼᗕሲᗻ˅ᇍ䈵ᶤϾ㉏ⱘ݋ԧᅲ՟ᢹ᳝㞾Ꮕⱘ䴭ᗕሲᗻؐˈ᠔԰᪡԰䛑ᰃ䩜ᇍѢ㞾䑿ⱘሲᗻ䴶৥䖛⿟㄀ϔℹ㄀Ѡℹ……䴶৥ᇍ䈵᳝ાѯ㉏ˈાѯሲᗻˈાѯᮍ⊩ˈાѯ݇㋏ᑊ䴲ᇍゟѢ䴶৥䖛⿟ˈᰃᇍ䴶৥䖛⿟ⱘ㸹ܙ੠ࣙ㺙ϡৠ䯂乬ඳЁᇍѢৠḋџ⠽ⱘᢑ䈵㾦ᑺᰃϡϔḋⱘ㉏˄ᇍ䈵˅П䯈ⱘ݇㋏ձ䌪݇㘨㒻ᡓ˄ᜢ⫼˅㘮ড়˄㘮䲚ǃ㒘ড়˅ᅲ⦄໮ᗕ˄polymophism,dynamicbind,latebind,runtimebind)javaЁ⫼classᅮНϔϾ㉏៤ਬব䞣Ӯ㹿咬䅸䖯㸠߱ྟ࣪Ja