java线程同步几种方式 Java多线程同步的几种方式
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java\u4e2d\u591a\u7ebf\u7a0b\u7684\u5b9e\u73b0\u65b9\u6cd5\u6709\u4e24\u79cd\uff1a1.\u76f4\u63a5\u7ee7\u627fthread\u7c7b\uff1b2.\u5b9e\u73b0runnable\u63a5\u53e3\uff1b\u540c\u6b65\u7684\u5b9e\u73b0\u65b9\u6cd5\u6709\u4e94\u79cd\uff1a1.\u540c\u6b65\u65b9\u6cd5\uff1b2.\u540c\u6b65\u4ee3\u7801\u5757\uff1b3.\u4f7f\u7528\u7279\u6b8a\u57df\u53d8\u91cf(volatile)\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\uff1b4.\u4f7f\u7528\u91cd\u5165\u9501\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\uff1b5.\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65 \u3002
\u5176\u4e2d\u591a\u7ebf\u7a0b\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\u9700\u6ce8\u610f\u91cd\u5199\u6216\u8005\u8986\u76d6run()\u65b9\u6cd5\uff0c\u800c\u5bf9\u4e8e\u540c\u6b65\u7684\u5b9e\u73b0\u65b9\u6cd5\u4e2d\u4f7f\u7528\u8f83\u5e38\u4f7f\u7528\u7684\u662f\u5229\u7528synchronized\u7f16\u5199\u540c\u6b65\u65b9\u6cd5\u548c\u4ee3\u7801\u5757\u3002
\u8c22\u8c22\u91c7\u7eb3\uff01\uff01
你可以使用synchronized(object)来对一个对象加锁。
也可以使用synchronized来声明一个方法，例如
public synchronized static void fun(){
}
绛旓細鍚屾鐨勫疄鐜鏂瑰紡鏈変袱绉:synchronized,wait涓巒otify銆侾ublic static synchronized void test(){} Public Void test1(){synchronized clock{}} 鍦Java涓瓀ait鍜宻leep鏂规硶鐨勪笉鍚:鏈澶х殑涓嶅悓鏄湪绛夊緟鏃秝ait浼氶噴鏀鹃攣,鑰宻leep浼氫竴鐩村彧鏈夐攣銆倃ait閫氬父琚敤浜绾跨▼涔嬮棿浜や簰,sleep閫氬父琚敤浜庢殏鍋滄墽琛屻
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绛旓細绾跨▼鍚屾鐨鏂瑰紡鍖呮嫭锛氫簰鏂ラ攣銆佽鍐欓攣銆佹潯浠跺彉閲忋佷俊鍙烽噺鍜屼护鐗屻備互Java璇█涓轰緥锛氱敤synchronized鍏抽敭瀛椾慨楗板悓姝ユ柟娉曘傚悓姝ユ湁鍑犵瀹炵幇鏂规硶鍒嗗埆鏄痵ynchronized,wait涓巒otify wait():浣夸竴涓嚎绋嬪浜庣瓑寰呯姸鎬侊紝骞朵笖閲婃斁鎵鎸佹湁鐨勫璞＄殑lock銆俿leep():浣夸竴涓鍦ㄨ繍琛岀殑绾跨▼澶勪簬鐫＄湢鐘舵侊紝鏄竴涓潤鎬佹柟娉曪紝璋冪敤姝ゆ柟娉...
绛旓細淇″彿閲忓璞″绾跨▼鐨鍚屾鏂瑰紡涓庡墠闈鍑犵鏂规硶涓嶅悓,淇″彿鍏佽澶氫釜绾跨▼鍚屾椂浣跨敤鍏变韩璧勬簮,杩欎笌鎿嶄綔绯荤粺涓殑PV鎿嶄綔鐩稿悓銆傚畠鎸囧嚭浜嗗悓鏃惰闂叡浜祫婧愮殑绾跨▼鏈澶ф暟鐩傚畠鍏佽澶氫釜绾跨▼鍦ㄥ悓涓鏃跺埢璁块棶鍚屼竴璧勬簮,浣嗘槸闇瑕侀檺鍒跺湪鍚屼竴鏃跺埢璁块棶姝よ祫婧愮殑鏈澶х嚎绋嬫暟鐩傚湪鐢–reateSemaphore()鍒涘缓淇″彿閲忔椂鍗宠鍚屾椂鎸囧嚭鍏佽鐨勬渶澶ц祫婧愯鏁板拰...
绛旓細寮曡█锛java鏄湪1990骞村垵 锛岃瑭瑰鏂•楂樻柉鏋楃瓑浜哄紑鍙戠殑涓闂ㄩ潰鍚戝璞＄殑缂栫▼璇█銆傝捣鍒濓紝java琚О涓0ak锛屾潵缁忚繃鍙戝睍0ak鏀瑰悕涓簀ava锛屼笌1995骞寸殑浜旀湀浠芥寮忓悜澶у鍙戝竷銆備竴銆乯ava绫荤殑瀹炰緥鍖栭『搴廽ava鐨勫疄渚嬪寲椤哄簭鍦ㄧ户鎵挎病鏈夌殑鎯呭喌 鍗曠嫭涓涓被鐨勫満鏅笅锛屽垵濮嬪寲椤哄簭涓轰緷娆′负闈欐佹暟鎹紝缁ф壙鐨勫熀绫荤殑鏋勯犲嚱鏁...
绛旓細1)volatile鍏抽敭瀛椾负鍩熷彉閲忕殑璁块棶鎻愪緵浜嗕竴绉嶅厤閿佹満鍒;2)浣跨敤volatile淇グ鍩熺浉褰撲簬鍛婅瘔铏氭嫙鏈鸿鍩熷彲鑳戒細琚叾浠栫嚎绋嬫洿鏂帮紝3)鍥犳姣忔浣跨敤璇ュ煙灏辫閲嶆柊璁＄畻锛岃屼笉鏄娇鐢ㄥ瘎瀛樺櫒涓殑鍊 4)volatile涓嶄細鎻愪緵浠讳綍鍘熷瓙鎿嶄綔锛屽畠涔熶笉鑳界敤鏉ヤ慨楗癴inal绫诲瀷鐨勫彉閲 4銆佷娇鐢ㄩ噸鍏ラ攣瀹炵幇绾跨▼鍚屾 鍦JavaSE5.0涓柊澧炰簡涓涓...
绛旓細鍏充簬绾跨▼鐨鍚屾锛屼竴鑸湁浠ヤ笅瑙ｅ喅鏂规硶锛1. 鍦ㄩ渶瑕佸悓姝ョ殑鏂规硶鐨勬柟娉曠鍚嶄腑鍔犲叆synchronized鍏抽敭瀛椼2. 浣跨敤synchronized鍧楀闇瑕佽繘琛屽悓姝ョ殑浠ｇ爜娈佃繘琛屽悓姝ャ3. 浣跨敤JDK 5涓彁渚涚殑java.util.concurrent.lock鍖呬腑鐨凩ock瀵硅薄銆傚彟澶栵紝涓轰簡瑙ｅ喅澶氫釜绾跨▼瀵瑰悓涓鍙橀噺杩涜璁块棶鏃跺彲鑳藉彂鐢熺殑瀹夊叏鎬ч棶棰橈紝鎴戜滑涓嶄粎鍙互閲囩敤鍚屾...
绛旓細閫氳繃synchronize鍔犻攣杩涜瀹炵幇杩涜涔嬮棿鐨勪簰鏂ャ侀氳繃wait銆乶otify鏂规硶瀹炵幇绾跨▼涔嬮棿鐨鍚屾銆
绛旓細缁撴灉锛氳鐐瑰嚮杈撳叆鍥剧墖鎻忚堪 java澶绾跨▼鐨勫惎鍔ㄩ『搴忎笉涓瀹氭槸绾跨▼鎵ц鐨勯『搴忥紝鍚勪釜绾跨▼涔嬮棿鏄姠鍗燙PU璧勬簮鎵ц鐨勶紝鎵鏈夋湁鍙兘鍑虹幇涓庡惎鍔ㄩ『搴忎笉涓鑷寸殑鎯呭喌銆侰PU鐨勮皟鐢ㄧ瓥鐣ワ細濡備綍浣跨敤CPU璧勬簮鏄敱鎿嶄綔绯荤粺鏉ュ喅瀹氱殑锛屼絾鎿嶄綔绯荤粺鍙兘鍐冲畾CPU鐨勪娇鐢ㄧ瓥鐣ヤ笉鑳芥帶鍒跺疄闄呰幏寰桟PU鎵ц鏉冪殑绋嬪簭銆傜嚎绋嬫墽琛屾湁涓ょ鏂瑰紡锛1.鎶㈠崰寮忥細鐩...
绛旓細杩欎釜瑕佸垎娈垫潵瀹炵幇锛 绗竴姝ユ槸璁╃嚎绋嬪悓姝ワ紝绗簩閮ㄦ槸璁╃嚎绋嬫湁椤哄簭銆傚悓姝ワ細鎴戜滑鍙互鐢╯ynchronized鏉ヨВ鍐炽Java绾跨▼鍚屾鍘熺悊锛 java浼氫负姣忎釜object瀵硅薄鍒嗛厤涓涓猰onitor锛屽綋鏌愪釜瀵硅薄鐨勫悓姝ユ柟娉曪紙synchronized methods 锛夎澶氫釜绾跨▼璋冪敤鏃讹紝璇ュ璞＄殑monitor灏嗚礋璐ｅ鐞嗚繖浜涜闂殑骞跺彂鐙崰瑕佹眰銆傚綋涓涓嚎绋嬭皟鐢ㄤ竴涓璞...
