锘??xml version="1.0" encoding="utf-8" standalone="yes"?>日韩视频永久免费观看,国产精品日韩,亚洲国产精品黑人久久久http://m.shnenglu.com/wing/category/17362.html騫哥鐨勯緲斺斺旂畝鍗曚笘鐣?/description>zh-cnTue, 26 Jul 2011 01:42:58 GMTTue, 26 Jul 2011 01:42:58 GMT60鐢熶駭鑰呮秷璐硅呴棶棰?wait銆乶otify銆?notifyAll鐢ㄦ硶紺轟緥)http://m.shnenglu.com/wing/archive/2011/07/25/151819.html闆粵渚濇ⅵ闆粵渚濇ⅵMon, 25 Jul 2011 12:10:00 GMThttp://m.shnenglu.com/wing/archive/2011/07/25/151819.htmlhttp://m.shnenglu.com/wing/comments/151819.htmlhttp://m.shnenglu.com/wing/archive/2011/07/25/151819.html#Feedback0http://m.shnenglu.com/wing/comments/commentRss/151819.htmlhttp://m.shnenglu.com/wing/services/trackbacks/151819.html闃呰鍏ㄦ枃

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[杞澆]Java綰跨▼錛氱嚎紼嬬殑鍚屾涓庨攣http://m.shnenglu.com/wing/archive/2011/07/23/151713.html闆粵渚濇ⅵ闆粵渚濇ⅵSat, 23 Jul 2011 12:50:00 GMThttp://m.shnenglu.com/wing/archive/2011/07/23/151713.htmlhttp://m.shnenglu.com/wing/comments/151713.htmlhttp://m.shnenglu.com/wing/archive/2011/07/23/151713.html#Feedback0http://m.shnenglu.com/wing/comments/commentRss/151713.htmlhttp://m.shnenglu.com/wing/services/trackbacks/151713.html涓銆佸悓姝ラ棶棰樻彁鍑?/strong>
綰跨▼鐨勫悓姝ユ槸涓轟簡闃叉澶氫釜綰跨▼璁塊棶涓涓暟鎹璞℃椂錛屽鏁版嵁閫犳垚鐨勭牬鍧忋?/div>
渚嬪錛氫袱涓嚎紼婽hreadA銆乀hreadB閮芥搷浣滃悓涓涓璞oo瀵硅薄錛屽茍淇敼Foo瀵硅薄涓婄殑鏁版嵁銆?/div>
package thread;

public class Foo {
private static int x = 100;

public int getX() {
return x;
}

public int fix(int y) {
x = x - y;
try {
Thread.currentThread().sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()
錛?" : 褰撳墠foo瀵硅薄鐨剎鍊?" 錛?getX());
return x;
}
}

package thread;

public class SynchronizedDemo implements Runnable {
private Foo foo = new Foo();

public void run() {
for (int i = 0; i < 100; i錛嬶紜) {
this.fix(30);
}
}

public int fix(int y) {
return foo.fix(y);
}

public static void main(String[] args) {
SynchronizedDemo a = new SynchronizedDemo();
Thread tha = new Thread(a, "A");
Thread thb = new Thread(a, "B");
Thread thc = new Thread(a, "C");
Thread thd = new Thread(a, "D");
Thread the = new Thread(a, "E");
Thread thf = new Thread(a, "F");
Thread thg = new Thread(a, "G");
Thread thh = new Thread(a, "H");
Thread thi = new Thread(a, "I");
Thread thj = new Thread(a, "J");
Thread thk = new Thread(a, "K");
tha.start();
thb.start();
thc.start();
thd.start();
the.start();
thf.start();
thg.start();
thh.start();
thi.start();
thj.start();
thk.start();
}
}
 
榪愯

緇撴灉錛?/div>
浠庣粨鏋滃彂鐜幫紝榪欐牱鐨勮緭鍑哄兼槑鏄炬槸涓嶅悎鐞嗙殑銆傚師鍥犳槸涓や釜綰跨▼涓嶅姞鎺у埗鐨勮闂瓼oo瀵硅薄騫朵慨鏀瑰叾鏁版嵁鎵鑷淬?/div>
濡傛灉瑕佷繚鎸佺粨鏋滅殑鍚堢悊鎬э紝鍙渶瑕佽揪鍒頒竴涓洰鐨勶紝灝辨槸灝嗗Foo鐨勮闂姞浠ラ檺鍒訛紝姣忔鍙兘鏈変竴涓嚎紼嬪湪璁塊棶銆傝繖鏍峰氨鑳戒繚璇丗oo瀵硅薄涓暟鎹殑鍚堢悊鎬т簡銆?/div>
鍦ㄥ叿浣撶殑Java浠g爜涓渶瑕佸畬鎴愪竴涓嬩袱涓搷浣滐細(xì)
鎶婄珵浜夎闂殑璧勬簮綾籉oo鍙橀噺x鏍囪瘑涓簆rivate錛?/div>
鍚屾鍝簺淇敼鍙橀噺鐨勪唬鐮侊紝浣跨敤synchronized鍏抽敭瀛楀悓姝ユ柟娉曟垨浠g爜銆?/div>
浜屻佸悓姝ュ拰閿佸畾
1銆侀攣鐨勫師鐞?/div>
Java涓瘡涓璞¢兘鏈変竴涓唴緗攣
褰撶▼搴忚繍琛屽埌闈為潤鎬佺殑synchronized鍚屾鏂規(guī)硶涓婃椂錛岃嚜鍔ㄨ幏寰椾笌姝e湪鎵ц浠g爜綾葷殑褰撳墠瀹炰緥錛坱his瀹炰緥錛夋湁鍏崇殑閿併傝幏寰椾竴涓璞$殑閿佷篃縐頒負(fù)鑾峰彇閿併侀攣瀹氬璞°佸湪瀵硅薄涓婇攣瀹氭垨鍦ㄥ璞′笂鍚屾銆?/div>
褰撶▼搴忚繍琛屽埌synchronized鍚屾鏂規(guī)硶鎴栦唬鐮佸潡鏃舵墠璇ュ璞¢攣鎵嶈搗浣滅敤銆?/div>
涓涓璞″彧鏈変竴涓攣銆傛墍浠ワ紝濡傛灉涓涓嚎紼嬭幏寰楄閿侊紝灝辨病鏈夊叾浠栫嚎紼嬪彲浠ヨ幏寰楅攣錛岀洿鍒扮涓涓嚎紼嬮噴鏀撅紙鎴栬繑鍥烇級閿併傝繖涔熸剰鍛崇潃浠諱綍鍏朵粬綰跨▼閮戒笉鑳借繘鍏ヨ瀵硅薄涓婄殑synchronized鏂規(guī)硶鎴栦唬鐮佸潡錛岀洿鍒拌閿佽閲婃斁銆?/div>
閲婃斁閿佹槸鎸囨寔閿佺嚎紼嬮鍑轟簡synchronized鍚屾鏂規(guī)硶鎴栦唬鐮佸潡銆?/div>
鍏充簬閿佸拰鍚屾錛屾湁涓涓嬪嚑涓鐐癸細(xì)
1錛夈佸彧鑳藉悓姝ユ柟娉曪紝鑰屼笉鑳藉悓姝ュ彉閲忓拰綾伙紱
2錛夈佹瘡涓璞″彧鏈変竴涓攣錛涘綋鎻愬埌鍚屾鏃訛紝搴旇娓呮鍦ㄤ粈涔堜笂鍚屾錛熶篃灝辨槸璇達(dá)紝鍦ㄥ摢涓璞′笂鍚屾錛?/div>
3錛夈佷笉蹇呭悓姝ョ被涓墍鏈夌殑鏂規(guī)硶錛岀被鍙互鍚屾椂鎷ユ湁鍚屾鍜岄潪鍚屾鏂規(guī)硶銆?/div>
4錛夈佸鏋滀袱涓嚎紼嬭鎵ц涓涓被涓殑synchronized鏂規(guī)硶錛屽茍涓斾袱涓嚎紼嬩嬌鐢ㄧ浉鍚岀殑瀹炰緥鏉ヨ皟鐢ㄦ柟娉曪紝閭d箞涓嬈″彧鑳芥湁涓涓嚎紼嬭兘澶熸墽琛屾柟娉曪紝鍙︿竴涓渶瑕佺瓑寰咃紝鐩村埌閿佽閲婃斁銆備篃灝辨槸璇達(dá)細(xì)濡傛灉涓涓嚎紼嬪湪瀵硅薄涓婅幏寰椾竴涓攣錛屽氨娌℃湁浠諱綍鍏朵粬綰跨▼鍙互榪涘叆錛堣瀵硅薄鐨勶級綾諱腑鐨勪換浣曚竴涓悓姝ユ柟娉曘?/div>
5錛夈佸鏋滅嚎紼嬫嫢鏈夊悓姝ュ拰闈炲悓姝ユ柟娉曪紝鍒欓潪鍚屾鏂規(guī)硶鍙互琚涓嚎紼嬭嚜鐢辮闂屼笉鍙楅攣鐨勯檺鍒躲?/div>6錛夈佺嚎紼嬬潯鐪犳椂錛屽畠鎵鎸佺殑浠諱綍閿侀兘涓嶄細(xì)閲婃斁銆?
7錛夈佺嚎紼嬪彲浠ヨ幏寰楀涓攣銆傛瘮濡傦紝鍦ㄤ竴涓璞$殑鍚屾鏂規(guī)硶閲岄潰璋冪敤鍙﹀涓涓璞$殑鍚屾鏂規(guī)硶錛屽垯鑾峰彇浜嗕袱涓璞$殑鍚屾閿併?/div>
8錛夈佸悓姝ユ崯瀹沖茍鍙戞э紝搴旇灝藉彲鑳界緝?yōu)畯鍚屾鑼冨洿銆傚悓姝ヤ笉浣嗗彲浠ュ悓姝ユ暣涓柟娉曪紝榪樺彲浠ュ悓姝ユ柟娉曚腑涓閮ㄥ垎浠g爜鍧椼?/div>
9錛夈佸湪浣跨敤鍚屾浠g爜鍧楁椂鍊欙紝搴旇鎸囧畾鍦ㄥ摢涓璞′笂鍚屾錛屼篃灝辨槸璇磋鑾峰彇鍝釜瀵硅薄鐨勯攣銆備緥濡傦細(xì)
public int fix(int y) {
synchronized (this) {
x = x - y;
}
return x;
}
褰撶劧錛屽悓姝ユ柟娉曚篃鍙互鏀瑰啓涓洪潪鍚屾鏂規(guī)硶錛屼絾鍔熻兘瀹屽叏涓鏍風(fēng)殑錛屼緥濡傦細(xì)
public synchronized int getX() {
return x++;
}
涓?/div>
public int getX() {
synchronized (this) {
return x;
}
}
鏁堟灉鏄畬鍏ㄤ竴鏍風(fēng)殑銆?/div>
涓夈侀潤鎬佹柟娉曞悓姝?/strong>
瑕佸悓姝ラ潤鎬佹柟娉曪紝闇瑕佷竴涓敤浜庢暣涓被瀵硅薄鐨勯攣錛岃繖涓璞℃槸灝辨槸榪欎釜綾伙紙XXX.class)銆?/div>
渚嬪錛?/div>
public static synchronized int setName(String name){
Xxx.name = name;
}
絳変環(huán)浜?br />public static int setName(String name){
synchronized(Xxx.class){
Xxx.name = name;
}
}

鍥涖佸鏋滅嚎紼嬩笉鑳戒笉鑳借幏寰楅攣浼?xì)鎬庝箞鏍?/strong>
濡傛灉綰跨▼璇曞浘榪涘叆鍚屾鏂規(guī)硶錛岃屽叾閿佸凡緇忚鍗犵敤錛屽垯綰跨▼鍦ㄨ瀵硅薄涓婅闃誨銆傚疄璐ㄤ笂錛岀嚎紼嬭繘鍏ヨ瀵硅薄鐨勭殑涓縐嶆睜涓紝蹇呴』鍦ㄥ摢閲岀瓑寰咃紝鐩村埌鍏墮攣琚噴鏀撅紝璇ョ嚎紼嬪啀嬈″彉涓哄彲榪愯鎴栬繍琛屼負(fù)姝€?/div>
褰撹冭檻闃誨鏃訛紝涓瀹氳娉ㄦ剰鍝釜瀵硅薄姝h鐢ㄤ簬閿佸畾錛?/div>
1銆佽皟鐢ㄥ悓涓涓璞′腑闈為潤鎬佸悓姝ユ柟娉曠殑綰跨▼灝嗗郊姝ら樆濉炪傚鏋滄槸涓嶅悓瀵硅薄錛屽垯姣忎釜綰跨▼鏈夎嚜宸辯殑瀵硅薄鐨勯攣錛岀嚎紼嬮棿褰兼浜掍笉騫查銆?/div>
2銆佽皟鐢ㄥ悓涓涓被涓殑闈欐佸悓姝ユ柟娉曠殑綰跨▼灝嗗郊姝ら樆濉烇紝瀹冧滑閮芥槸閿佸畾鍦ㄧ浉鍚岀殑Class瀵硅薄涓娿?/div>
3銆侀潤鎬佸悓姝ユ柟娉曞拰闈為潤鎬佸悓姝ユ柟娉曞皢姘歌繙涓嶄細(xì)褰兼闃誨錛屽洜涓洪潤鎬佹柟娉曢攣瀹氬湪Class瀵硅薄涓婏紝闈為潤鎬佹柟娉曢攣瀹氬湪璇ョ被鐨勫璞′笂銆?/div>
4銆佸浜庡悓姝ヤ唬鐮佸潡錛岃鐪嬫竻妤氫粈涔堝璞″凡緇忕敤浜庨攣瀹氾紙synchronized鍚庨潰鎷彿鐨勫唴瀹癸級銆傚湪鍚屼竴涓璞′笂榪涜鍚屾鐨勭嚎紼嬪皢褰兼闃誨錛屽湪涓嶅悓瀵硅薄涓婇攣瀹氱殑綰跨▼灝嗘案榪滀笉浼?xì)褰兼闃诲銆?/div>
浜斻佷綍鏃墮渶瑕佸悓姝?/strong>
鍦ㄥ涓嚎紼嬪悓鏃惰闂簰鏂ワ紙鍙氦鎹級鏁版嵁鏃訛紝搴旇鍚屾浠ヤ繚鎶ゆ暟鎹紝紜繚涓や釜綰跨▼涓嶄細(xì)鍚屾椂淇敼鏇存敼瀹冦?/div>
瀵逛簬闈為潤鎬佸瓧孌典腑鍙洿鏀圭殑鏁版嵁錛岄氬父浣跨敤闈為潤鎬佹柟娉曡闂?/div>
瀵逛簬闈欐佸瓧孌典腑鍙洿鏀圭殑鏁版嵁錛岄氬父浣跨敤闈欐佹柟娉曡闂?/div>
濡傛灉闇瑕佸湪闈為潤鎬佹柟娉曚腑浣跨敤闈欐佸瓧孌碉紝鎴栬呭湪闈欐佸瓧孌典腑璋冪敤闈為潤鎬佹柟娉曪紝闂灝嗗彉寰楅潪甯稿鏉傘傚凡緇忚秴鍑篠JCP鑰冭瘯鑼冨洿浜嗐?/div>
鍏佺嚎紼嬪畨鍏ㄧ被
褰撲竴涓被宸茬粡寰堝ソ鐨勫悓姝ヤ互淇濇姢瀹冪殑鏁版嵁鏃訛紝榪欎釜綾誨氨縐頒負(fù)“綰跨▼瀹夊叏鐨?#8221;銆?/div>
鍗充嬌鏄嚎紼嬪畨鍏ㄧ被錛屼篃搴旇鐗瑰埆灝忓績錛屽洜涓烘搷浣滅殑綰跨▼鏄棿浠嶇劧涓嶄竴瀹氬畨鍏ㄣ?/div>
涓句釜褰㈣薄鐨勪緥瀛愶紝姣斿涓涓泦鍚堟槸綰跨▼瀹夊叏鐨勶紝鏈変袱涓嚎紼嬪湪鎿嶄綔鍚屼竴涓泦鍚堝璞★紝褰撶涓涓嚎紼嬫煡璇㈤泦鍚堥潪絀哄悗錛屽垹闄ら泦鍚堜腑鎵鏈夊厓绱犵殑鏃跺欍傜浜屼釜綰跨▼涔熸潵鎵ц涓庣涓涓嚎紼嬬浉鍚岀殑鎿嶄綔錛屼篃璁稿湪絎竴涓嚎紼嬫煡璇㈠悗錛岀浜屼釜綰跨▼涔熸煡璇㈠嚭闆嗗悎闈炵┖錛屼絾鏄綋絎竴涓墽琛屾竻闄ゅ悗錛岀浜屼釜鍐嶆墽琛屽垹闄ゆ樉鐒舵槸涓嶅鐨勶紝鍥犱負(fù)姝ゆ椂闆嗗悎宸茬粡涓虹┖浜嗐?/div>
鐪嬩釜浠g爜錛?/div>
public class NameList {
private
List nameList = Collections.synchronizedList(new
LinkedList());

public
void
add(String name) {
nameList.add(name);
}

public
String removeFirst() {
if
(nameList.size() > 0) {
return
(String) nameList.remove(0);
} else
{
return
null
;
}
}
}
public class Test {
public
static
void
main(String[] args) {
final
NameList nl = new
NameList();
nl.add("aaa"
);
class
NameDropper extends
Thread{
public
void
run(){
String name = nl.removeFirst();
System.out.println(name);
}
}

Thread t1 = new
NameDropper();
Thread t2 = new
NameDropper();
t1.start();
t2.start();
}
}
铏界劧闆嗗悎瀵硅薄
private List nameList = Collections.synchronizedList(new LinkedList());
鏄悓姝ョ殑錛屼絾鏄▼搴忚繕涓嶆槸綰跨▼瀹夊叏鐨勩?/div>
鍑虹幇榪欑浜嬩歡鐨勫師鍥犳槸錛屼笂渚嬩腑涓涓嚎紼嬫搷浣滃垪琛ㄨ繃紼嬩腑鏃犳硶闃繪鍙﹀涓涓嚎紼嬪鍒楄〃鐨勫叾浠栨搷浣溿?/div>
瑙e喅涓婇潰闂鐨勫姙娉曟槸錛屽湪鎿嶄綔闆嗗悎瀵硅薄鐨凬ameList涓婇潰鍋氫竴涓悓姝ャ傛敼鍐欏悗鐨勪唬鐮佸涓嬶細(xì)
public class NameList {
private
List nameList = Collections.synchronizedList(new
LinkedList());

public
synchronized
void
add(String name) {
nameList.add(name);
}

public
synchronized
String removeFirst() {
if
(nameList.size() > 0) {
return
(String) nameList.remove(0);
} else
{
return
null
;
}
}
}
榪欐牱錛屽綋涓涓嚎紼嬭闂叾涓竴涓悓姝ユ柟娉曟椂錛屽叾浠栫嚎紼嬪彧鏈夌瓑寰呫?/div>
涓冦佺嚎紼嬫閿?/strong>
姝婚攣瀵笿ava紼嬪簭鏉ヨ錛屾槸寰堝鏉傜殑錛屼篃寰堥毦鍙戠幇闂銆傚綋涓や釜綰跨▼琚樆濉烇紝姣忎釜綰跨▼鍦ㄧ瓑寰呭彟涓涓嚎紼嬫椂灝卞彂鐢熸閿併?/div>
榪樻槸鐪嬩竴涓瘮杈冪洿瑙傜殑姝婚攣渚嬪瓙錛?/div>
public class DeadlockRisk {
private
static
class
Resource {
public
int
value;
}

private
Resource resourceA = new
Resource();
private
Resource resourceB = new
Resource();

public
int
read() {
synchronized
(resourceA) {
synchronized
(resourceB) {
return
resourceB.value + resourceA.value;
}
}
}

public
void
write(int
a, int
b) {
synchronized
(resourceB) {
synchronized
(resourceA) {
resourceA.value = a;
resourceB.value = b;
}
}
}
}
鍋囪read()鏂規(guī)硶鐢變竴涓嚎紼嬪惎鍔紝write()鏂規(guī)硶鐢卞彟澶栦竴涓嚎紼嬪惎鍔ㄣ傝綰跨▼灝嗘嫢鏈塺esourceA閿侊紝鍐欑嚎紼嬪皢鎷ユ湁resourceB閿侊紝涓よ呴兘鍧氭寔絳夊緟鐨勮瘽灝卞嚭鐜版閿併?/div>
瀹為檯涓婏紝涓婇潰榪欎釜渚嬪瓙鍙戠敓姝婚攣鐨勬鐜囧緢灝忋傚洜涓哄湪浠g爜鍐呯殑鏌愪釜鐐癸紝CPU蹇呴』浠庤綰跨▼鍒囨崲鍒板啓綰跨▼錛屾墍浠ワ紝姝婚攣鍩烘湰涓婁笉鑳藉彂鐢熴?/div>
浣嗘槸錛屾棤璁轟唬鐮佷腑鍙戠敓姝婚攣鐨勬鐜囨湁澶氬皬錛屼竴鏃﹀彂鐢熸閿侊紝紼嬪簭灝辨鎺夈傛湁涓浜涜璁℃柟娉曡兘甯姪閬垮厤姝婚攣錛屽寘鎷緇堟寜鐓ч瀹氫箟鐨勯『搴忚幏鍙栭攣榪欎竴絳栫暐銆傚凡緇忚秴鍑篠CJP鐨勮冭瘯鑼冨洿銆?/div>
鍏佺嚎紼嬪悓姝ュ皬緇?/strong>
1銆佺嚎紼嬪悓姝ョ殑鐩殑鏄負(fù)浜嗕繚鎶ゅ涓嚎紼嬪弽闂竴涓祫婧愭椂瀵硅祫婧愮殑鐮村潖銆?/div>
2銆佺嚎紼嬪悓姝ユ柟娉曟槸閫氳繃閿佹潵瀹炵幇錛屾瘡涓璞¢兘鏈夊垏浠呮湁涓涓攣錛岃繖涓攣涓庝竴涓壒瀹氱殑瀵硅薄鍏寵仈錛岀嚎紼嬩竴鏃﹁幏鍙栦簡瀵硅薄閿侊紝鍏朵粬璁塊棶璇ュ璞$殑綰跨▼灝辨棤娉曞啀璁塊棶璇ュ璞$殑鍏朵粬鍚屾鏂規(guī)硶銆?/div>
3銆佸浜庨潤鎬佸悓姝ユ柟娉曪紝閿佹槸閽堝榪欎釜綾葷殑錛岄攣瀵硅薄鏄綾葷殑Class瀵硅薄銆傞潤鎬佸拰闈為潤鎬佹柟娉曠殑閿佷簰涓嶅共棰勩備竴涓嚎紼嬭幏寰楅攣錛屽綋鍦ㄤ竴涓悓姝ユ柟娉曚腑璁塊棶鍙﹀瀵硅薄涓婄殑鍚屾鏂規(guī)硶鏃訛紝浼?xì)鑾峰彇杩欎袱涓璞¢攣銆?/div>
4銆佸浜庡悓姝ワ紝瑕佹椂鍒繪竻閱掑湪鍝釜瀵硅薄涓婂悓姝ワ紝榪欐槸鍏抽敭銆?/div>
5銆佺紪鍐欑嚎紼嬪畨鍏ㄧ殑綾伙紝闇瑕佹椂鍒繪敞鎰忓澶氫釜綰跨▼绔炰簤璁塊棶璧勬簮鐨勯昏緫鍜屽畨鍏ㄥ仛鍑烘紜殑鍒ゆ柇錛屽“鍘熷瓙”鎿嶄綔鍋氬嚭鍒嗘瀽錛屽茍淇濊瘉鍘熷瓙鎿嶄綔鏈熼棿鍒殑綰跨▼鏃犳硶璁塊棶绔炰簤璧勬簮銆?/div>
6銆佸綋澶氫釜綰跨▼絳夊緟涓涓璞¢攣鏃訛紝娌℃湁鑾峰彇鍒伴攣鐨勭嚎紼嬪皢鍙戠敓闃誨銆?/div>
7銆佹閿佹槸綰跨▼闂寸浉浜掔瓑寰呴攣閿侀犳垚鐨勶紝鍦ㄥ疄闄呬腑鍙戠敓鐨勬鐜囬潪甯哥殑灝忋傜湡璁╀綘鍐欎釜姝婚攣紼嬪簭錛屼笉涓瀹氬ソ浣匡紝鍛靛懙銆備絾鏄紝涓鏃︾▼搴忓彂鐢熸閿侊紝紼嬪簭灝嗘鎺夈?/div>

 

2010-02-22 11:39:12
鍗氫富鐨勭涓涓嚎紼嬪悓姝ョ殑渚嬪瓙搴旇榪欐牱涓炬墠鍚堥傚惂
package thread;

public class Foo {
private static int x = 100;

public int getX() {
return x;
}

public int fix(int y) {
x = x - y;
try {
Thread.currentThread().sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()
錛?" : 褰撳墠foo瀵硅薄鐨剎鍊?" 錛?getX());
return x;
}
}

package thread;

public class SynchronizedDemo implements Runnable {
private Foo foo = new Foo();

public void run() {
for (int i = 0; i < 100; i錛嬶紜) {
this.fix(30);
}
}

public int fix(int y) {
return foo.fix(y);
}

public static void main(String[] args) {
SynchronizedDemo a = new SynchronizedDemo();
Thread tha = new Thread(a, "A");
Thread thb = new Thread(a, "B");
Thread thc = new Thread(a, "C");
Thread thd = new Thread(a, "D");
Thread the = new Thread(a, "E");
Thread thf = new Thread(a, "F");
Thread thg = new Thread(a, "G");
Thread thh = new Thread(a, "H");
Thread thi = new Thread(a, "I");
Thread thj = new Thread(a, "J");
Thread thk = new Thread(a, "K");
tha.start();
thb.start();
thc.start();
thd.start();
the.start();
thf.start();
thg.start();
thh.start();
thi.start();
thj.start();
thk.start();
}
}


]]>榪涚▼涓嶫ava綰跨▼鐨勫尯鍒?/title><link>http://m.shnenglu.com/wing/archive/2011/07/22/151631.html</link><dc:creator>闆粵渚濇ⅵ</dc:creator><author>闆粵渚濇ⅵ</author><pubDate>Fri, 22 Jul 2011 06:04:00 GMT</pubDate><guid>http://m.shnenglu.com/wing/archive/2011/07/22/151631.html</guid><wfw:comment>http://m.shnenglu.com/wing/comments/151631.html</wfw:comment><comments>http://m.shnenglu.com/wing/archive/2011/07/22/151631.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/wing/comments/commentRss/151631.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/wing/services/trackbacks/151631.html</trackback:ping><description><![CDATA[<center><font color="#000099"><strong>榪涚▼涓嶫ava綰跨▼鐨勫尯鍒?/strong></font></center> <p><br /><br />搴旂敤紼嬪簭鍦ㄦ墽琛岃繃紼嬩腑瀛樺湪涓涓唴瀛樼┖闂寸殑鍒濆鍏ュ彛鐐瑰湴鍧銆佷竴涓▼搴忔墽琛岃繃紼嬩腑鐨勪唬鐮佹墽琛屽簭鍒椾互鍙?qiáng)鐢ㄤ簬鏍囪瘑杩浗E嬬粨鏉熺殑鍐呭瓨鍑哄彛鐐瑰湴鍧錛屽湪榪涚▼鎵ц榪囩▼涓殑姣忎竴鏃墮棿鐐瑰潎鏈夊敮涓鐨勫鐞嗗櫒鎸囦護(hù)涓庡唴瀛樺崟鍏冨湴鍧鐩稿搴斻?<br /><br />Java璇█涓畾涔夌殑綰跨▼錛圱hread錛夊悓鏍峰寘鎷竴涓唴瀛樺叆鍙g偣鍦板潃銆佷竴涓嚭鍙g偣鍦板潃浠ュ強(qiáng)鑳藉欏哄簭鎵ц鐨勪唬鐮佸簭鍒椼備絾鏄繘紼嬩笌綰跨▼鐨勯噸瑕佸尯鍒湪浜庣嚎紼嬩笉鑳藉鍗曠嫭鎵ц錛屽畠蹇呴』榪愯鍦ㄥ浜庢椿鍔ㄧ姸鎬佺殑搴旂敤紼嬪簭榪涚▼涓紝鍥犳鍙互瀹氫箟<span style="color: red"><strong>綰跨▼鏄▼搴忓唴閮ㄧ殑鍏鋒湁騫跺彂鎬х殑欏哄簭浠g爜嫻?/strong></span>銆?<br /><br />Unix鎿嶄綔緋葷粺鍜孧icrosoft Windows鎿嶄綔緋葷粺鏀寔澶氱敤鎴楓佸榪涚▼鐨勫茍鍙戞墽琛岋紝鑰孞ava璇█鏀寔搴旂敤紼嬪簭榪涚▼鍐呴儴鐨勫涓墽琛岀嚎紼嬬殑騫跺彂鎵ц銆?span style="color: red">澶氱嚎紼嬬殑鎰忎箟鍦ㄤ簬涓涓簲鐢ㄧ▼搴忕殑澶氫釜閫昏緫鍗曞厓鍙互騫跺彂鍦版墽琛屻?/span>浣嗘槸澶氱嚎紼嬪茍涓嶆剰鍛崇潃澶氫釜鐢ㄦ埛榪涚▼鍦ㄦ墽琛岋紝鎿嶄綔緋葷粺涔熶笉鎶婃瘡涓嚎紼嬩綔涓虹嫭绔嬬殑榪涚▼鏉ュ垎閰嶇嫭绔嬬殑緋葷粺璧勬簮銆傝繘紼嬪彲浠ュ垱寤哄叾瀛愯繘紼嬶紝瀛愯繘紼嬩笌鐖惰繘紼嬫嫢鏈変笉鍚岀殑鍙墽琛屼唬鐮佸拰鏁版嵁鍐呭瓨絀洪棿銆傝屽湪鐢ㄤ簬浠h〃搴旂敤紼嬪簭鐨勮繘紼嬩腑澶氫釜綰跨▼鍏變韓鏁版嵁鍐呭瓨絀洪棿錛屼絾淇濇寔姣忎釜綰跨▼鎷ユ湁鐙珛鐨勬墽琛屽爢鏍堝拰紼嬪簭鎵ц涓婁笅鏂囷紙Context錛夈?<br /><br />鍩轟簬涓婅堪鍖哄埆錛岀嚎紼嬩篃鍙互縐頒負(fù)杞誨瀷榪涚▼ (Light Weight Process錛孡WP)銆備笉鍚岀嚎紼嬮棿鍏佽浠誨姟鍗忎綔鍜屾暟鎹氦鎹紝浣垮緱鍦ㄨ綆楁満緋葷粺璧勬簮娑堣楃瓑鏂歸潰闈炲父寤変環(huán)銆?<br /><br />綰跨▼闇瑕佹搷浣滅郴緇熺殑鏀寔錛屼笉鏄墍鏈夌被鍨嬬殑璁$畻鏈洪兘鏀寔澶氱嚎紼嬪簲鐢ㄧ▼搴忋?span style="color: red">Java紼嬪簭璁捐璇█灝嗙嚎紼嬫敮鎸佷笌璇█榪愯鐜緇撳悎鍦ㄤ竴璧鳳紝鎻愪緵浜嗗浠誨姟騫跺彂鎵ц鐨勮兘鍔涖?/span>榪欏氨濂芥瘮涓涓漢鍦ㄥ鐞嗗鍔$殑榪囩▼涓紝灝嗚。鏈嶆斁鍒版礂琛f満涓嚜鍔ㄦ礂娑ゅ悗灝嗗ぇ綾蟲斁鍦ㄧ數(shù)楗攨閲岋紝鐒跺悗寮濮嬪仛鑿溿傜瓑鑿滃仛濂戒簡錛岄キ鐔熶簡鍚屾椂琛f湇涔熸礂濂戒簡銆?<br /><br />闇瑕佹敞鎰忕殑鏄細(xì)鍦ㄥ簲鐢ㄧ▼搴忎腑浣跨敤澶氱嚎紼嬩笉浼?xì)澧炲?CPU 鐨勬暟鎹鐞嗚兘鍔涖傚彧鏈夊湪澶欳PU 鐨勮綆楁満鎴栬呭湪緗戠粶璁$畻浣撶郴緇撴瀯涓嬶紝灝咼ava紼嬪簭鍒掑垎涓哄涓茍鍙戞墽琛岀嚎紼嬪悗錛屽悓鏃跺惎鍔ㄥ涓嚎紼嬭繍琛岋紝浣夸笉鍚岀殑綰跨▼榪愯鍦ㄥ熀浜庝笉鍚屽鐞嗗櫒鐨凧ava铏氭嫙鏈轟腑錛屾墠鑳芥彁楂樺簲鐢ㄧ▼搴忕殑鎵ц鏁堢巼銆?</p><img src ="http://m.shnenglu.com/wing/aggbug/151631.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/wing/" target="_blank">闆粵渚濇ⅵ</a> 2011-07-22 14:04 <a href="http://m.shnenglu.com/wing/archive/2011/07/22/151631.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>java.io涓璼erializable璁茶Вhttp://m.shnenglu.com/wing/archive/2011/07/22/151614.html闆粵渚濇ⅵ闆粵渚濇ⅵFri, 22 Jul 2011 03:08:00 GMThttp://m.shnenglu.com/wing/archive/2011/07/22/151614.htmlhttp://m.shnenglu.com/wing/comments/151614.htmlhttp://m.shnenglu.com/wing/archive/2011/07/22/151614.html#Feedback0http://m.shnenglu.com/wing/comments/commentRss/151614.htmlhttp://m.shnenglu.com/wing/services/trackbacks/151614.html1銆佸簭鍒楀寲鏄共浠涔堢殑錛?br />
綆鍗曡灝辨槸涓轟簡淇濆瓨鍦ㄥ唴瀛樹腑鐨勫悇縐嶅璞$殑鐘舵侊紙涔熷氨鏄疄渚嬪彉閲忥紝涓嶆槸鏂規(guī)硶錛夛紝騫朵笖鍙互鎶婁繚瀛樼殑瀵硅薄鐘舵佸啀璇誨嚭鏉ャ傝櫧鐒朵綘鍙互鐢ㄤ綘鑷繁鐨勫悇縐嶅悇鏍風(fēng)殑鏂規(guī)硶鏉ヤ繚瀛榦bject states錛屼絾鏄疛ava緇欎綘鎻愪緵涓縐嶅簲璇ユ瘮浣犺嚜宸卞ソ鐨勪繚瀛樺璞$姸鎬佺殑鏈哄埗錛岄偅灝辨槸搴忓垪鍖栥?br />
2銆佷粈涔堟儏鍐典笅闇瑕佸簭鍒楀寲
a錛夊綋浣犳兂鎶婄殑鍐呭瓨涓殑瀵硅薄鐘舵佷繚瀛樺埌涓涓枃浠朵腑鎴栬呮暟鎹簱涓椂鍊欙紱
b錛夊綋浣犳兂鐢ㄥ鎺ュ瓧鍦ㄧ綉緇滀笂浼犻佸璞$殑鏃跺欙紱
c錛夊綋浣犳兂閫氳繃RMI浼犺緭瀵硅薄鐨勬椂鍊欙紱

3銆佸綋瀵逛竴涓璞″疄鐜板簭鍒楀寲鏃訛紝絀剁珶鍙戠敓浜嗕粈涔堬紵
鍦ㄦ病鏈夊簭鍒楀寲鍓嶏紝姣忎釜淇濆瓨鍦ㄥ爢錛圚eap錛変腑鐨勫璞¢兘鏈夌浉搴旂殑鐘舵侊紙state錛夛紝鍗沖疄渚嬪彉閲忥紙instance ariable錛夋瘮濡傦細(xì)
java 浠g爜
  1. Foo myFoo = new Foo();
  2. myFoo .setWidth(37);
  3. myFoo.setHeight(70);

褰?閫氳繃涓嬮潰鐨勪唬鐮佸簭鍒楀寲涔嬪悗錛孧yFoo瀵硅薄涓殑width鍜孒eight瀹炰緥鍙橀噺鐨勫鹼紙37錛?0錛夐兘琚繚瀛樺埌foo.ser鏂囦歡涓紝榪欐牱浠ュ悗鍙堝彲浠ユ妸瀹?浠庢枃浠朵腑璇誨嚭鏉ワ紝閲嶆柊鍦ㄥ爢涓垱寤哄師鏉ョ殑瀵硅薄銆傚綋鐒朵繚瀛樻椂鍊欎笉浠呬粎鏄繚瀛樺璞$殑瀹炰緥鍙橀噺鐨勫鹼紝JVM榪樿淇濆瓨涓浜涘皬閲忎俊鎭紝姣斿綾葷殑綾誨瀷絳変互渚挎仮澶嶅師鏉ョ殑瀵?璞°?br />
java 浠g爜
  1. FileOutputStream fs = new FileOutputStream("foo.ser");
  2. ObjectOutputStream os = new ObjectOutputStream(fs);
  3. os.writeObject(myFoo);

4銆佸疄鐜板簭鍒楀寲錛堜繚瀛樺埌涓涓枃浠訛級鐨勬楠?br />a錛塎ake a FileOutputStream
java 浠g爜
  1. FileOutputStream fs = new FileOutputStream("foo.ser");
b錛塎ake a ObjectOutputStream
java 浠g爜
  1. ObjectOutputStream os = new ObjectOutputStream(fs);
c錛墂rite the object
java 浠g爜
  1. os.writeObject(myObject1);
  2. os.writeObject(myObject2);
  3. os.writeObject(myObject3);
d) close the ObjectOutputStream
java 浠g爜
  1. os.close();
鐩稿叧娉ㄦ剰浜嬮」
a錛夊簭鍒楀寲鏃訛紝鍙瀵硅薄鐨勭姸鎬佽繘琛屼繚瀛橈紝鑰屼笉綆″璞$殑鏂規(guī)硶錛?br />b錛夊綋涓涓埗綾誨疄鐜板簭鍒楀寲錛屽瓙綾昏嚜鍔ㄥ疄鐜板簭鍒楀寲錛屼笉闇瑕佹樉寮忓疄鐜癝erializable鎺ュ彛錛?br />c錛夊綋涓涓璞$殑瀹炰緥鍙橀噺寮曠敤鍏朵粬瀵硅薄錛屽簭鍒楀寲璇ュ璞℃椂涔熸妸寮曠敤瀵硅薄榪涜搴忓垪鍖栵紱
d錛夊茍闈炴墍鏈夌殑瀵硅薄閮藉彲浠ュ簭鍒楀寲錛?鑷充簬涓轟粈涔堜笉鍙互錛屾湁寰堝鍘熷洜浜?姣斿錛?br />1.瀹夊叏鏂歸潰鐨勫師鍥狅紝姣斿涓涓璞℃嫢鏈塸rivate錛宲ublic絳塮ield錛屽浜庝竴涓浼犺緭鐨勫璞★紝姣斿鍐欏埌鏂囦歡錛屾垨鑰呰繘琛宺mi浼犺緭 絳夌瓑錛屽湪搴忓垪鍖栬繘琛屼紶杈撶殑榪囩▼涓紝榪欎釜瀵硅薄鐨刾rivate絳夊煙鏄笉鍙椾繚鎶ょ殑銆?br />2. 璧勬簮鍒嗛厤鏂歸潰鐨勫師鍥狅紝姣斿socket錛宼hread綾伙紝濡傛灉鍙互搴忓垪鍖栵紝榪涜浼犺緭鎴栬呬繚瀛橈紝涔熸棤娉曞浠栦滑榪涜閲嶆柊鐨勮祫婧愬垎 閰嶏紝鑰屼笖錛屼篃鏄病鏈夊繀瑕佽繖鏍峰疄鐜般?


]]>java緙撳啿嫻佷腑mark錛堬級鍜宺eset錛堬級鍑芥暟鐢ㄦ硶瑙f瀽http://m.shnenglu.com/wing/archive/2011/07/21/151545.html闆粵渚濇ⅵ闆粵渚濇ⅵThu, 21 Jul 2011 06:46:00 GMThttp://m.shnenglu.com/wing/archive/2011/07/21/151545.htmlhttp://m.shnenglu.com/wing/comments/151545.htmlhttp://m.shnenglu.com/wing/archive/2011/07/21/151545.html#Feedback0http://m.shnenglu.com/wing/comments/commentRss/151545.htmlhttp://m.shnenglu.com/wing/services/trackbacks/151545.html鏍規(guī)嵁JAVA瀹樻柟鏂囨。鐨勬弿榪幫紝mark(int readlimit)鏂規(guī)硶琛ㄧず錛屾爣璁板綋鍓嶄綅緗紝騫朵繚璇佸湪mark浠ュ悗鏈澶氬彲浠ヨ鍙杛eadlimit瀛楄妭鏁版嵁錛宮ark鏍囪浠嶆湁鏁堛傚鏋滃湪mark鍚庤鍙栬秴榪噐eadlimit瀛楄妭鏁版嵁錛宮ark鏍囪灝變細(xì)澶辨晥錛岃皟鐢╮eset()鏂規(guī)硶浼?xì)鏈夊紓甯搞?
浣嗗疄闄呯殑榪愯鎯呭喌鍗村拰JAVA鏂囨。涓殑鎻忚堪騫朵笉瀹屽叏鐩哥銆?鏈夋椂鍊欏湪BufferedInputStream綾諱腑璋冪敤mark(int readlimit)鏂規(guī)硶鍚庯紝鍗充嬌璇誨彇瓚呰繃readlimit瀛楄妭鐨勬暟鎹紝mark鏍囪浠嶆湁鏁堬紝浠嶇劧鑳芥紜皟鐢╮eset鏂規(guī)硶閲嶇疆銆?

浜嬪疄涓婏紝mark鍦↗AVA涓殑瀹炵幇鏄拰緙撳啿鍖虹浉鍏崇殑銆傚彧瑕佺紦鍐插尯澶熷ぇ錛宮ark鍚庤鍙栫殑鏁版嵁娌℃湁瓚呭嚭緙撳啿鍖虹殑澶у皬錛宮ark鏍囪灝變笉浼?xì)澶辨晥銆傚鏋滀笉澶熷ぇ錛宮ark鍚庡張璇誨彇浜嗗ぇ閲忕殑鏁版嵁錛屽鑷寸紦鍐插尯鏇存柊錛屽師鏉ユ爣璁扮殑浣嶇疆鑷劧鎵句笉鍒頒簡銆?/p>

鍥犳錛宮ark鍚庤鍙栧灝戝瓧鑺傛墠澶辨晥錛屽茍涓嶅畬鍏ㄧ敱readlimit鍙傛暟紜畾錛屼篃鍜孊ufferedInputStream綾葷殑緙撳啿鍖哄ぇ灝忔湁鍏熾?濡傛灉BufferedInputStream綾葷殑緙撳啿鍖哄ぇ灝忓ぇ浜巖eadlimit錛屽湪mark浠ュ悗鍙湁璇誨彇瓚呰繃緙撳啿鍖哄ぇ灝忕殑鏁版嵁錛宮ark鏍囪鎵嶄細(xì)澶辨晥銆傜湅涓嬮潰鐨勪緥瀛愩?

<span style="color: rgb(255, 0, 0);">ava浠g爜
package packet1;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
/**
* @author WuDian
*
*/
public class MarkExample {
public static void main(String[] args) {
try {
// 鍒濆鍖栦竴涓瓧鑺傛暟緇勶紝鍐呮湁5涓瓧鑺傜殑鏁版嵁
byte[] bytes={1,2,3,4,5};
// 鐢ㄤ竴涓狟yteArrayInputStream鏉ヨ鍙栬繖涓瓧鑺傛暟緇?
ByteArrayInputStream in=new ByteArrayInputStream(bytes);
// 灝咮yteArrayInputStream鍖呭惈鍦ㄤ竴涓狟ufferedInputStream錛屽茍鍒濆鍖栫紦鍐插尯澶у皬涓?銆?
BufferedInputStream bis=new BufferedInputStream(in,2);
// 璇誨彇瀛楄妭1
System.out.print(bis.read()+",");
// 鍦ㄥ瓧鑺?澶勫仛鏍囪錛屽悓鏃惰緗畆eadlimit鍙傛暟涓?
// 鏍規(guī)嵁JAVA鏂囨。mark浠ュ悗鏈澶氬彧鑳借鍙?涓瓧鑺傦紝鍚﹀垯mark鏍囪澶辨晥錛屼絾瀹為檯榪愯緇撴灉涓嶆槸榪欐牱
System.out.println("mark");
bis.mark(1);
/*
* 榪炵畫璇誨彇涓や釜瀛楄妭錛岃秴榪囦簡readlimit鐨勫ぇ灝忥紝mark鏍囪浠嶆湁鏁?
*/
// 榪炵畫璇誨彇涓や釜瀛楄妭
System.out.print(bis.read()+",");
System.out.print(bis.read()+",");
// 璋冪敤reset鏂規(guī)硶錛屾湭鍙戠敓寮傚父錛岃鏄巑ark鏍囪浠嶆湁鏁堛?
// 鍥犱負(fù)錛岃櫧鐒秗eadlimit鍙傛暟涓?錛屼絾鏄繖涓狟ufferedInputStream綾葷殑緙撳啿鍖哄ぇ灝忎負(fù)2錛?
// 鎵浠ュ厑璁歌鍙?瀛楄妭
System.out.println("reset");
bis.reset();
/*
* 榪炵畫璇誨彇3涓瓧鑺傦紝瓚呰繃浜嗙紦鍐插尯澶у皬錛宮ark鏍囪澶辨晥銆?
* 鍦ㄨ繖涓緥瀛愪腑BufferedInputStream綾葷殑緙撳啿鍖哄ぇ灝忓ぇ浜巖eadlimit,
* mark鏍囪鐢辯紦鍐插尯澶у皬鍐沖畾
*/
// reset閲嶇疆鍚庤繛緇鍙?涓瓧鑺傦紝瓚呰繃浜咮ufferedInputStream綾葷殑緙撳啿鍖哄ぇ灝?
System.out.print(bis.read()+",");
System.out.print(bis.read()+",");
System.out.print(bis.read()+",");
// 鍐嶆璋冪敤reset閲嶇疆錛屾姏鍑哄紓甯革紝璇存槑mark鍚庤鍙?涓瓧鑺傦紝mark鏍囪澶辨晥
System.out.println("reset again");
bis.reset();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}


]]>
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