java面试题大全-基础方面.pdf

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1、F•XCHANGF•XCHANGDEDEPPwwClicktobuyNOW!ClicktobuyNOW!wmwmwowo.d.c.d.cocu•trackocu•trackJava෎⸔ᮍ䴶:1ǃ԰⫼ඳpublic,private,protected,ҹঞϡݭᯊⱘऎ߿ㄨ˖ऎ߿བϟ˖԰⫼ඳᔧࠡ㉏ৠϔpackageᄤᄭ㉏݊Ҫpackagepublic√√√√protected√√√×friendly√√××private√×××ϡݭᯊ咬䅸Ўfriendly2ǃAnonymousInnerClass(ओৡݙ䚼㉏)ᰃ৺ৃҹextends(㒻ᡓ)݊ᅗ㉏ˈᰃ৺ৃҹi

2、mplements(ᅲ⦄)interface(᥹ষ)ㄨ˖ओৡⱘݙ䚼㉏ᰃ≵᳝ৡᄫⱘݙ䚼㉏DŽϡ㛑extends(㒻ᡓ)݊ᅗ㉏ˈԚϔϾݙ䚼㉏ৃҹ԰ЎϔϾ᥹ষˈ⬅঺ϔϾݙ䚼㉏ᅲ⦄3ǃStaticNestedClass੠InnerClassⱘϡৠㄨ˖NestedClass˄ϔ㠀ᰃC++ⱘ䇈⊩˅ˈInnerClass(ϔ㠀ᰃJAVAⱘ䇈⊩)DŽJavaݙ䚼㉏ϢC++ጠ༫㉏᳔໻ⱘϡৠህ೼Ѣᰃ৺᳝ᣛ৥໪䚼ⱘᓩ⫼ϞDŽ⊼˖䴭ᗕݙstaticϾϔᓎ߯1ⴔੇᛣ˅ClassInner˄㉏䚼ݙ䚼㉏ⱘᇍ䈵ˈϡ䳔㽕ϔϾ໪䚼㉏ᇍ䈵ˈ2ϡ㛑ҢϔϾstaticݙ䚼㉏ⱘϔϾᇍ䈵䆓䯂ϔϾ໪䚼㉏ᇍ

3、䈵4ǃ&੠&&ⱘऎ߿ㄨ˖&ᰃԡ䖤ㅫヺˈ㸼⼎ᣝԡϢ䖤ㅫˈ&&ᰃ䘏䕥䖤ㅫヺˈ㸼⼎䘏䕥Ϣ˄and˅5ǃCollection੠Collectionsⱘऎ߿ㄨ˖Collectionᰃ䲚ড়㉏ⱘϞ㑻᥹ষˈ㒻ᡓϢҪⱘ᥹ষЏ㽕᳝Set੠List.Collectionsᰃ䩜ᇍ䲚ড়㉏ⱘϔϾᐂࡽ㉏ˈҪᦤկϔ㋏߫䴭ᗕᮍ⊩ᅲ⦄ᇍ৘⾡䲚ড়ⱘ᧰㋶ǃᥦᑣǃ㒓⿟ᅝܼ࣪ㄝ᪡԰6ǃҔМᯊ׭⫼assertㄨ˖assertion(ᮁ㿔)೼䕃ӊᓔথЁᰃϔ⾡ᐌ⫼ⱘ䇗䆩ᮍᓣˈᕜ໮ᓔথ䇁㿔Ё䛑ᬃᣕ䖭⾡ᴎࠊDŽ೼ᅲ⦄Ёˈassertionህᰃ೼⿟ᑣЁⱘϔᴵ䇁হˈᅗᇍϔϾboolean㸼䖒ᓣ䖯㸠ẔᶹˈϔϾℷ⹂

4、⿟ᑣᖙ乏䆕䖭Ͼboolean㸼䖒ᓣⱘؐЎtrue˗བᵰ䆹ؐЎfalseˈ䇈ᯢ⿟ᑣᏆ㒣໘Ѣϡℷ⹂ⱘ⢊ᗕϟˈ㋏㒳ᇚ㒭ߎ䄺ਞ៪䗔ߎDŽϔ㠀ᴹ䇈ˈassertion⫼Ѣ䆕⿟ᑣ᳔෎ᴀǃ݇䬂ⱘℷ⹂ᗻDŽassertionẔᶹ䗮ᐌ೼ᓔথ੠⌟䆩ᯊᓔਃDŽЎњᦤ催ᗻ㛑ˈ೼䕃ӊথᏗৢˈassertionẔᶹ䗮ᐌᰃ݇䯁ⱘ7ǃStrings=newString("xyz");߯ᓎњ޴ϾStringObjectㄨ˖ϸϾˈϔϾᄫヺᇍ䈵ˈϔϾᄫヺᇍ䈵ᓩ⫼ᇍ䈵8ǃMath.round(11.5)ㄝᮐ໮ᇥ?Math.round(•11.5)ㄝᮐ໮ᇥㄨ:Math.round(11.5)==12

5、;Math.round(•11.5)==•11;roundᮍ⊩䖨ಲϢখ᳔᭄᥹䖥ⱘ䭓ᭈ᭄ˈখ᭄ࡴ1/2ৢ∖݊floorF•XCHANGF•XCHANGDEDEPPwwClicktobuyNOW!ClicktobuyNOW!wmwmwowo.d.c.d.cocu•trackocu•track9ǃshorts1=1;s1=s1+1;᳝ҔМ䫭?shorts1=1;s1+=1;᳝ҔМ䫭ㄨ˖shorts1=1;s1=s1+1;˄s1+1䖤ㅫ㒧ᵰᰃintൟˈ䳔㽕ᔎࠊ䕀ᤶ㉏ൟ˅shorts1=1;s1+=1;˄ৃҹℷ⹂㓪䆥˅10ǃJava᳝≵᳝gotoㄨ˖javaЁⱘ

6、⬭ᄫˈ⦄೼≵᳝೼javaЁՓ⫼11ǃ᭄㒘᳝≵᳝length()䖭Ͼᮍ⊩?String᳝≵᳝length()䖭Ͼᮍ⊩ㄨ˖᭄㒘≵᳝length()䖭Ͼᮍ⊩ˈ᳝lengthⱘሲᗻDŽString᳝᳝length()䖭Ͼᮍ⊩12ǃOverload੠Overrideⱘऎ߿DŽOverloadedⱘᮍ⊩ᰃ৺ৃҹᬍব䖨ಲؐⱘ㉏ൟㄨ˖ᮍ⊩ⱘ䞡ݭOverriding੠䞡䕑OverloadingᰃJava໮ᗕᗻⱘϡৠ㸼⦄DŽ䞡ݭOverridingᰃ⠊㉏Ϣᄤ㉏П䯈໮ᗕᗻⱘϔ⾡㸼⦄ˈ䞡䕑OverloadingᰃϔϾ㉏Ё໮ᗕᗻⱘϔ⾡㸼⦄DŽབᵰ೼ᄤ㉏ЁᅮНᶤᮍ⊩Ϣ݊⠊㉏᳝Ⳍৠⱘৡ⿄੠

7、খ᭄ˈ៥Ӏ䇈䆹ᮍ⊩㹿䞡ݭ(Overriding)DŽᄤ㉏ⱘᇍ䈵Փ⫼䖭Ͼᮍ⊩ᯊˈᇚ䇗⫼ᄤ㉏ЁⱘᅮНˈᇍᅗ㗠㿔ˈ⠊㉏ЁⱘᅮНབৠ㹿"ሣ㬑"њDŽབᵰ೼ϔϾ㉏ЁᅮНњ໮Ͼৠৡⱘᮍ⊩ˈᅗӀ៪᳝ϡৠⱘখ᭄Ͼ᭄៪᳝ϡৠⱘখ᭄㉏ൟˈ߭⿄Ўᮍ⊩ⱘ䞡䕑(Overloading)DŽOverloadedⱘᮍ⊩ᰃৃҹᬍব䖨ಲؐⱘ㉏ൟ13ǃSet䞠ⱘܗ㋴ᰃϡ㛑䞡໡ⱘˈ䙷М⫼ҔМᮍ⊩ᴹऎߚ䞡໡Ϣ৺ਸ਼?ᰃ⫼==䖬ᰃequals()?ᅗӀ᳝ԩऎ߿ㄨ˖Set䞠ⱘܗ㋴ᰃϡ㛑䞡໡ⱘˈ䙷М⫼iterator()ᮍ⊩ᴹऎߚ䞡໡Ϣ৺DŽequals()ᰃ߸䇏ϸϾSetᰃ৺Ⳍㄝequals()੠==ᮍ⊩

8、އᅮᓩ⫼ؐᰃ৺ᣛ৥ৠϔᇍ䈵equals()೼㉏Ё㹿㽚ⲪˈЎⱘᰃᔧϸϾߚ⾏ⱘᇍ䈵ⱘݙᆍ੠㉏ൟⳌ䜡