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Java騫跺彂緙栫▼闈㈣瘯棰樻暣鐞?50闂?PDF 涓嬭澆
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Java騫跺彂緙栫▼闈㈣瘯150闂?/div>
Q1錛氱嚎紼嬭秺澶氱▼搴忔槸鍚﹀氨榪愯寰楄秺蹇紵
絳旓細(xì)騫跺彂緙栫▼鐨勭洰鐨勬槸涓轟簡(jiǎn)璁╃▼搴忚繍琛屽緱鏇村揩錛屼絾鏄茍涓嶆槸鍚姩寰楃嚎紼嬭秺澶氬氨鑳借紼嬪簭鏈€澶ч檺搴﹀湴騫跺彂鎵ц銆傚湪騫跺彂緙栫▼鏃訛紝濡傛灉甯屾湜閫氳繃澶氱嚎紼嬫墽琛屼換鍔¤紼嬪簭榪愯寰楁洿蹇細(xì)闈復(fù)寰堝鎸戞垬錛屾瘮濡備笂涓嬫枃鍒囨崲鐨勯棶棰樸€佹閿佺殑闂錛屼互鍙?qiáng)鍙楅檺浜幖嫭錃g鍜岃蔣浠剁殑璧勬簮闄愬埗闂銆?/div>
Q2錛氬綰跨▼騫跺彂鏄€庝箞瀹炵幇鐨勶紝蹇呴』瑕佺敤澶氭牳澶勭悊鍣ㄥ疄鐜板悧錛?/div>
絳旓細(xì)鍗充嬌鏄崟鏍稿鐞嗗櫒涔熸敮鎸佸綰跨▼鎵ц浠ｇ爜錛孋PU閫氳繃緇欐瘡涓嚎紼嬪垎閰岰PU鏃墮棿鐗囨潵瀹炵幇榪欎釜鏈哄埗銆傛椂闂寸墖鏄疌PU鍒嗛厤緇欏悇涓嚎紼嬬殑鏃墮棿錛屽洜涓烘椂闂寸墖闈炲父鐭紙涓€鑸槸鍑犲崄姣錛夛紝鎵€浠PU閫氳繃涓嶅仠鍦板垏鎹㈢嚎紼嬫墽琛岋紝璁╂垜浠劅瑙夊涓嚎紼嬫槸鍚屾椂鎵ц鐨勩€?/div>
Q3錛氫粈涔堟槸涓婁笅鏂囧垏鎹紵
絳?CPU鏄€氳繃鏃墮棿鐗囧垎閰嶇畻娉曟潵寰幆鎵ц浠誨姟錛屽綋鍓嶄換鍔℃墽琛屼竴涓椂闂寸墖鍚庝細(xì)鍒囨崲鍒頒笅涓€涓換鍔°€備絾鏄湪鍒囨崲鍓嶄細(xì)淇濆瓨?shù)笂涓€涓換鍔＄殑鐘舵€侊紝浠ヤ究涓嬫鍐嶅垏鎹㈠洖榪欎釜浠誨姟鏃跺彲浠ュ啀鍔犺澆榪欎釜浠誨姟鐨勭姸鎬併€傛墍浠ヤ換鍔′粠淇濆瓨鍒板啀鍔犺澆鐨勮繃紼嬪氨鏄竴嬈′笂涓嬫枃鍒囨崲銆?/div>
Q4錛氬浣曞噺灝戜笂涓嬫枃鍒囨崲錛?/div>
絳旓細(xì)鈶犳棤閿佸茍鍙戠紪紼嬶細(xì)澶氱嚎紼嬬珵浜夐攣鏃朵細(xì)寮曡搗涓婁笅鏂囧垏鎹紝鎵€浠ュ綰跨▼澶勭悊鏁版嵁鏃訛紝鍙互閫氳繃涓€浜涙柟娉曟潵閬垮厤浣跨敤閿侊紝渚嬪灝嗘暟鎹殑id鎸夌収hash綆楁硶鍙栨ā鍒嗘錛屼笉鍚岀殑綰跨▼澶勭悊涓嶅悓鏁版嵁孌電殑鏁版嵁銆傗憽CAS綆楁硶錛欽ava鐨刟tomic鍖呬嬌鐢–AS綆楁硶鏉ユ洿鏂版暟鎹€屼笉闇€瑕佸姞閿併€傗憿浣跨敤鏈€灝戠嚎紼嬶細(xì)閬垮厤鍒涘緩涓嶉渶瑕佺殑綰跨▼錛屾瘮濡備換鍔″緢灝戯紝浣嗘槸鍒涘緩浜?jiǎn)寰堝绾拷E嬫潵澶勭悊錛岃繖鏍蜂細(xì)閫犳垚澶ч噺綰跨▼閮藉浜庣瓑寰呯姸鎬併€傗懀鍗忕▼錛氬湪鍗曠嚎紼嬮噷瀹炵幇澶氫換鍔＄殑璋冨害錛屽茍鍦ㄥ崟綰跨▼閲岀淮鎸佸涓換鍔￠棿鐨勫垏鎹€?/div>
Q5錛氬綰跨▼閬垮厤姝婚攣鐨勬柟娉曪紵
絳旓細(xì)鈶犻伩鍏嶄竴涓嚎紼嬪悓鏃惰幏寰楀涓攣銆傗憽閬垮厤涓€涓嚎紼嬪湪閿佸唴鍚屾椂鍗犵敤澶氫釜璧勬簮錛屽敖閲忎繚璇佹瘡涓攣鍙崰鐢ㄤ竴涓祫婧愩€傗憿灝濊瘯浣跨敤瀹氭椂閿侊紝浣跨敤lock.tryLock(timeout)鏉ユ浛浠ｄ嬌鐢ㄥ唴閮ㄩ攣鏈哄埗銆傗懀瀵逛簬鏁版嵁搴撻攣錛屽姞閿佸拰瑙ｉ攣蹇呴』鍦ㄤ竴涓暟鎹簱榪炴帴閲岋紝鍚﹀垯浼?xì)鍑虹幇瑙ｉ攣澶辫触鐨勯棶棰樸€?/div>
Q6錛歷olatile鍏抽敭瀛楃殑浣滅敤錛?/div>
絳旓細(xì)鈶爒olatile鏄交閲忕駭鐨剆ynchronized錛屽畠鍦ㄥ澶勭悊鍣ㄥ紑鍙戜腑淇濊瘉浜?jiǎn)鍏变韩鍙橀噺鐨勫彲瑙佹€с€傚彲瑙佹€х殑鎰忔€濇槸褰撲竴涓嚎紼嬩慨鏀逛竴涓叡浜彉閲忔椂錛屽彟澶栦竴涓嚎紼嬭兘璇誨埌榪欎釜淇敼鐨勫€箋€傗憽濡傛灉volatile鍙橀噺淇グ絎︿嬌鐢ㄦ伆褰撶殑璇濓紝瀹冩瘮synchronized鐨勪嬌鐢ㄥ拰鎵ц鎴愭湰鏇翠綆錛屽洜涓哄畠涓嶄細(xì)寮曡搗綰跨▼涓婁笅鏂囩殑鍒囨崲鍜岃皟搴︺€傗憿濡傛灉涓€涓瓧孌佃澹版槑鎴恦olatile錛孞ava綰跨▼鍐呭瓨妯″瀷紜繚鎵€鏈夌嚎紼嬬湅鍒拌繖涓彉閲忕殑鍊兼槸涓€鏍風(fēng)殑銆?/div>
Q7錛歷olatile鐨勫簳灞傛槸濡備綍瀹炵幇鐨勶紵
絳旓細(xì)鏈塿olatile淇グ鐨勫叡浜彉閲忓湪榪涜鍐欐搷浣滄椂鐨勬眹緙栦唬鐮佹槸鍏鋒湁lock鍓嶇紑鐨勬寚浠わ紝lock
鍓嶇紑鐨勬寚浠ゅ湪澶氭牳澶勭悊鍣ㄤ笅浼?xì)寮曞彂涓や欢浜嬪Q氣憼灝嗗綋鍓嶅鐞嗗櫒緙撳瓨琛岀殑鏁版嵁鍐欏洖鍒扮郴緇熷唴瀛樸€傗憽澶勭悊鍣ㄥ皢緙撳瓨鍥炲啓鍒板唴瀛樼殑鎿嶄綔浼?xì)鋴慑湪鍏朵粬CPU閲岀紦瀛樹(shù)簡(jiǎn)璇ュ唴瀛樺湴鍧€鐨勬暟鎹棤鏁堛€?/div>
涓轟簡(jiǎn)鎻愰珮澶勭悊閫熷害錛屽鐞嗗櫒涓嶇洿鎺ュ拰鍐呭瓨榪涜閫氫俊錛岃€屾槸鍏堝皢緋葷粺鍐呭瓨鐨勬暟鎹鍒板唴閮ㄧ紦瀛樺悗鍐嶈繘琛屾搷浣滐紝浣嗘搷浣滃畬涓嶇煡閬撲綍鏃朵細(xì)鍐欏洖鍐呭瓨銆傚鏋滃澹版槑浜?jiǎn)volatile鐨勫彉閲忚繘琛屽啓鎿嶄綔錛孞VM灝變細(xì)鍚戝鐞嗗櫒鍙戦€佷竴鏉ock鍓嶇紑鐨勬寚浠わ紝灝嗚繖涓彉閲忓湪緙撳瓨琛岀殑鏁版嵁鍐欏洖鍒扮郴緇熷唴瀛樸€備絾鏄氨綆楀啓鍥炲唴瀛橈紝濡傛灉鍏朵粬澶勭悊鍣ㄧ紦瀛樼殑鍊艱繕鏄棫鐨勶紝鍐嶆墽琛岃綆楁搷浣滃氨浼?xì)鏈夐棶棰樺Q圓BA闂錛夈€傛墍浠ュ湪澶氬鐞嗗櫒涓嬶紝涓轟簡(jiǎn)淇濊瘉鍚勪釜澶勭悊鍣ㄧ殑緙撳瓨鏄竴鑷寸殑灝變細(xì)瀹炵幇緙撳瓨?shù)竴鑷存€у崗璁紝姣忎釜澶勭悊鍣ㄩ€氳繃鍡呮帰鍦ㄦ€葷嚎涓婁紶鎾殑鏁版嵁鏉ユ鏌ヨ嚜宸辯紦瀛樼殑鍊兼槸涓嶆槸榪囨湡浜?jiǎn)锛屽綋澶勭悊鍣ㄥ彂鐜拌嚜宸本~撳瓨琛屽搴旂殑鍐呭瓨鍦板潃琚慨鏀癸紝灝變細(xì)灝嗗綋鍓嶅鐞嗗櫒鐨勭紦瀛樿璁劇疆涓烘棤鏁堢姸鎬侊紝褰撳鐞嗗櫒瀵硅繖涓暟鎹繘琛屼慨鏀規(guī)搷浣滅殑鏃跺€欙紝浼?xì)閲嶆栴C粠緋葷粺鍐呭瓨?shù)腑鎶婃暟鎹d埌澶勭悊鍣ㄧ紦瀛橀噷銆?/div>
Q8錛歷olatile濡備綍浼樺寲鎬ц兘錛?/div>
絳旓細(xì)鍙互閫氳繃榪藉姞瀛楄妭鐨勬柟寮忎紭鍖栨€ц兘錛屼緥濡侸DK7涓殑闃熷垪闆嗗悎綾籐inkedTransferQueue灝辨槸浣跨敤浜?jiǎn)杩藉姞瀛楄妭鐨勬柟寮忔潵浼樺寲闃熷垪鍑洪槦鍜屽叆闃熺殑鎬ц兘銆傜敱浜庝竴浜涘鐞嗗櫒鐨勯珮閫熺紦瀛樿鏄?4涓瓧鑺傚錛屼笉鏀寔閮ㄥ垎濉厖緙撳瓨琛岋紝濡傛灉闃熷垪鐨勫ご鑺傜偣鍜屽熬鑺傜偣閮戒笉瓚?4瀛楄妭錛屽綋涓€涓鐞嗗櫒璇曞浘淇敼澶磋妭鐐規(guī)椂灝變細(xì)灝嗘暣涓紦瀛樿閿佸畾錛岄偅涔堝湪緙撳瓨?shù)竴鑷存€х殑浣滅敤涓嬩細(xì)瀵艱嚧鍏朵粬澶勭悊鍣ㄤ笉鑳借闂嚜宸遍珮閫熺紦瀛樹(shù)腑鐨勫熬鑺傜偣錛岃€岄槦鍒楃殑鍏ラ槦鍜屽嚭闃熷張浼?xì)棰懢J佷慨鏀瑰ご鑺傜偣鍜屽熬鑺傜偣錛屽洜姝ゅ澶勭悊鍣ㄦ儏鍐典笅浼?xì)涓ラ噸濯?jiǎng)鍝嶉槦鍒楃殑鍏ラ槦鍜屽嚭闃熸晥鐜囥€傝拷鍔犲埌64瀛楄妭鍚庡氨鍙互濉弧楂橀€熺紦鍐插尯鐨勭紦瀛樿錛岄伩鍏嶅ご鑺傜偣鍜屽熬鑺傜偣鍔犺澆鍒板悓涓€涓紦瀛樿錛屼嬌瀹冧滑鐨勬搷浣滀笉浼?xì)浜掔洈R攣瀹氥€?span style="white-space:pre">
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Q9錛歴ynchronized閿佺殑褰㈠紡鏈夊摢浜涳紵
絳旓細(xì)鈶犲浜庡悓姝ユ櫘閫氭柟娉曪紝閿佹槸褰撳墠瀹炰緥瀵硅薄銆傗憽瀵逛簬闈?rùn)鎬佸悓姝ユ柟娉曪紝閿佹槸褰撳墠綾葷殑Class瀵硅薄銆傗憿瀵逛簬鍚屾鏂規(guī)硶鍧楋紝閿佹槸synchronized鎷彿閲岄厤緗殑瀵硅薄銆?/div>
Q10錛歴ynchronized鐨勫簳灞傛槸鎬庝箞瀹炵幇鐨勶紵
絳旓細(xì)JVM鍩轟簬榪涘叆鍜岄€€鍑篗onitor瀵硅薄鏉ュ疄鐜版柟娉曞悓姝ュ拰浠ｇ爜鍧楀悓姝ワ紝浣嗕袱鑰呯殑瀹炵幇緇嗚妭涓嶄竴鏍楓€備唬鐮佸潡鍚屾鏄嬌鐢╩onitorenter鍜宮onitorexit鎸囦護(hù)瀹炵幇鐨勶紝鑰屾柟娉曞悓姝ユ槸浣跨敤鍙︿竴縐嶆柟寮忓疄鐜扮殑錛岀粏鑺傚茍鏈湪JVM瑙勮寖涓緇嗚鏄庯紝浣嗘槸鏂規(guī)硶鐨勫悓姝ヤ篃鍙互浣跨敤榪欎袱涓寚浠ゆ潵瀹炵幇銆?/div>
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Q11錛氫粈涔堟槸閿佸崌綰э紙閿佷紭鍖栵級(jí)錛?/div>
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