锘??xml version="1.0" encoding="utf-8" standalone="yes"?>亚洲国产成人超福利久久精品 ,亚洲精品卡2卡3卡4卡5卡区,亚洲一区二区三区无码国产http://www.tkk7.com/aoneany/category/42806.html嬈蹭笂澶╁爞錛屽厛涓嬪湴鐙?/description>zh-cnMon, 30 Nov 2009 03:53:39 GMTMon, 30 Nov 2009 03:53:39 GMT60綾誨瀷淇℃伅-Thinking in java璇諱功絎旇http://www.tkk7.com/aoneany/articles/304119.html娌欐紶涓殑楸?/dc:creator>娌欐紶涓殑楸?/author>Sun, 29 Nov 2009 11:23:00 GMThttp://www.tkk7.com/aoneany/articles/304119.htmlhttp://www.tkk7.com/aoneany/comments/304119.htmlhttp://www.tkk7.com/aoneany/articles/304119.html#Feedback0http://www.tkk7.com/aoneany/comments/commentRss/304119.htmlhttp://www.tkk7.com/aoneany/services/trackbacks/304119.htmlClass.forName("Gum");

forName鏄彇寰桟lass寮曠敤鐨勪竴縐嶆柟娉曪紝榪斿洖涓涓狢lass瀵硅薄鐨勫紩鐢ㄣ?/p>

濡傛灉Gum綾昏繕娌℃湁琚姞杞藉氨鍔犺澆瀹冿紝鍦ㄥ姞杞借繃紼嬩腑錛孏um鐨勯潤鎬佸瓙鍙ヨ鎵ц銆?/p>

鍙兘浜х敓鐨勫紓甯革細ClassNotFoundException

Class.getInterfaces("Gum")

榪斿洖瀵硅薄鏄疌lass綾誨瀷錛岃〃紺虹被Gum鍖呭惈鐨勬帴鍙?/p>

濡傜被Gum implements interface1,

鍒欎細鑾峰彇鍒癷nterface1鐨勭被瀵硅薄

Class.newInstance()

瀹炵幇“铏氭嫙鏋勯犲櫒”鐨勪竴縐嶉斿緞

 

綾誨瓧闈㈠父閲?/strong>

obj.Class鐢熸垚瀵笴lass瀵硅薄鐨勫紩鐢紝瀹冩瘮forName鏇村姞瀹夊叏錛屽洜涓哄畠鍦ㄧ紪璇戞椂灝辨帴鍙楁鏌ャ?/p>

娉ㄦ剰:褰撲嬌鐢?Class鏉ュ垱寤篊lass瀵硅薄鐨勫紩鐢ㄦ椂錛屼笉浼氳嚜鍔ㄥ垵濮嬪寲Class瀵硅薄銆?/p>

class Initable{
    
static final int staticFinal=47;
    
static final int staticFinal2=ClassInitialization.rand.nextInt(1000);
    
static{
        System.out.println(
"Initialzing Initable");
    }

}

class Initable2{
    
static int staticNonFinal=147;
    
static{
        System.out.println(
"Initialzing Initable2");
    }

}

class Initable3{
    
static int staticNonFinal=74;
    
static{
        System.out.println(
"Initialzing Initable3");
    }

}

public class ClassInitialization {
    
public static Random rand=new Random(47);
    
public static void main(String[] args){
        Class initable
=Initable.class;
        System.out.println(
"After creating Initable ref");
        System.out.println(Initable.staticFinal);
        System.out.println(Initable.staticFinal2);
        System.out.println(Initable2.staticNonFinal);
        Class initable3
=Class.forName("Initable3");
        System.out.println(
"After creating Initable3 ref");
        System.out.println(Initable3.staticNonFinal);
    }

}

 

杈撳嚭緇撴灉涓猴細

Initialzing Initable
After creating Initable ref
47
258
Initialzing Initable2
147
Initialzing Initable3
After creating Initable3 ref
74

緇撹錛?/strong>濡傛灉涓涓猻tatic final鍊兼槸"緙栬瘧鏈熷父閲?錛屽氨璞nitable.staticFinal閭f牱錛岄偅涔堣繖涓間笉闇瑕佸Initable綾誨垵浣垮寲灝卞彲浠ヨ鍙栵紝浣嗘槸濡傛灉鍙槸灝嗕竴涓煙璁劇疆涓簊tatic鍜宖inal鐨勶紝濡傚Initable.staticFinal2鐨勮闂皢榪涜寮哄埗鐨勫垵浣垮寲錛屽洜涓哄畠涓嶆槸涓涓紪璇戝瀷甯擱噺銆?/p>

濡傛灉涓涓猻tatic鑰屼笉鏄痜inal鐨勶紝閭d箞鍦ㄥ畠璁塊棶鏃訛紝鎬繪槸瑕佹眰榪涜閾炬帴錛堜負榪欎釜鍩熷垎閰嶅瓨鍌ㄧ┖闂達級鍜屽垵濮嬪寲錛堝垵濮嬪寲璇ュ瓨鍌ㄧ┖闂達級錛屽氨鍍忓Initable2.staticNonFinal閭f牱銆?/p>

娉涘寲鐨凜lass寮曠敤

Class<Integer> iniClass=int.class

鏂扮殑杞瀷璇硶

case()

InstanceOf

鍙嶅皠

getMethods()榪斿洖Method瀵硅薄鐨勬暟緇?/p>

getConstructors()榪斿洖Contructor瀵硅薄鐨勬暟緇?/p>

鍔ㄦ佷唬鐞?/strong>

瀹炵幇InvocationHandler鎺ュ彛

public Object invoke(Objct proxy,Method method,Object[] args)throws Throwable锝涳綕鏂規硶

閫氳繃Proxy.newProxyInstance(ClassLoader,Class[],InvocationHandler)鍒涘緩鍔ㄦ佷唬鐞?/p>

鍏蜂綋紺轟緥鍙傝:

http://www.tkk7.com/aoneany/articles/271019.html



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瀛楃涓?Thinking in Java璇諱功絎旇http://www.tkk7.com/aoneany/articles/304020.html娌欐紶涓殑楸?/dc:creator>娌欐紶涓殑楸?/author>Sat, 28 Nov 2009 05:54:00 GMThttp://www.tkk7.com/aoneany/articles/304020.htmlhttp://www.tkk7.com/aoneany/comments/304020.htmlhttp://www.tkk7.com/aoneany/articles/304020.html#Feedback0http://www.tkk7.com/aoneany/comments/commentRss/304020.htmlhttp://www.tkk7.com/aoneany/services/trackbacks/304020.htmlString瀵硅薄鏄笉鍙彉鐨?/p>

Scanner鎵弿瀛楃涓插璞°?/p>

澶囨敞錛?/p>

鍦╦ava緙栬瘧濂界殑class鏂囦歡涓?鏈変釜鍖哄煙縐頒負Constant Pool,浠栨槸涓涓敱鏁扮粍緇勬垚鐨勮〃,綾誨瀷
涓篶p_info constant_pool[],鐢ㄦ潵瀛樺偍紼嬪簭涓嬌鐢ㄧ殑鍚勭甯擱噺,鍖呮嫭Class/String/Integer絳夊悇
縐嶅熀鏈琂ava鏁版嵁綾誨瀷,璇︽儏鍙傝The Java Virtual Machine Specification
4.4绔犺妭.

瀵逛簬Constant Pool,琛ㄧ殑鍩烘湰閫氱敤緇撴瀯涓?
cp_info {
        u1 tag;
        u1 info[];
}

tag鏄竴涓暟瀛?鐢ㄦ潵琛ㄧず瀛樺偍鐨勫父閲忕殑綾誨瀷,渚嬪8琛ㄧずString綾誨瀷,5琛ㄧずLong綾誨瀷,info[]鏍規嵁
綾誨瀷鐮乼ag鐨勪笉鍚屼細鍙戠敓鐩稿簲鍙樺寲.
瀵逛簬String綾誨瀷,琛ㄧ殑緇撴瀯涓?
CONSTANT_String_info {
        u1 tag;
        u2 string_index;
}
tag鍥哄畾涓?,string_index鏄瓧絎︿覆鍐呭淇℃伅,綾誨瀷涓?
CONSTANT_Utf8_info {
        u1 tag;
        u2 length;
        u1 bytes[length];
}
tag鍥哄畾涓?,length涓哄瓧絎︿覆鐨勯暱搴?bytes[length]涓哄瓧絎︿覆鐨勫唴瀹?

浠g爜鏍蜂緥
(浠ヤ笅浠g爜鍦╦dk6涓紪璇?
涓轟簡璇︾粏鐞嗚ВConstant Pool鐨勭粨鏋?鎴戜滑鍙傜湅涓浜涗唬鐮?
    String s1
= "sss111";
    String s2
= "sss222";
    System.out.println(s1
+ " " + s2);
鐢變簬
"sss111"鍜?/span>"sss222"閮芥槸瀛楃涓插父閲?鍦ㄧ紪璇戞湡灝卞凡緇忓垱寤哄ソ浜嗗瓨鍌ㄥ湪class鏂囦歡涓?
鍦ㄧ紪璇戝悗鐨刢lass鏂囦歡涓細瀛樺湪榪?涓父閲忕殑瀵瑰簲琛ㄧず:
08 00 11 01 00 06 73 73 73 31 31 31 08 00 13 01 ; ......sss111....
00 06 73 73 73 32 32 32                         ; ..sss222

鏍規嵁涓婇潰璇寸殑String甯擱噺緇撴瀯,鎴戜滑鍒嗘瀽涓涓?br /> 寮濮嬬殑08涓篊ONSTANT_String_info緇撴瀯涓殑tag,鑰?1搴旇鏄畠鐨勭浉瀵瑰紩鐢?01涓?br /> CONSTANT_Utf8_info鐨則ag,06涓哄搴斿瓧絎︿覆鐨勯暱搴?
73 73 73 31 31 31涓哄瓧絎︿覆瀵?br /> 搴旂殑緙栫爜,鎺ョ潃鍒嗘瀽,浼氬彂鐜板悗闈㈢殑鏄搴?/span>"sss222"鐨勫瓨鍌ㄧ粨鏋?

緇忚繃涓婇潰鍒嗘瀽,鎴戜滑鐭ラ亾浜?1鍜?3鏄袱涓瓧絎︿覆鐨勭浉瀵瑰紩鐢?灝卞彲浠ヤ慨鏀筩lass鏂囦歡
鏉ヤ慨鏀規墦鍗扮殑鍐呭,鎶奵lass鏂囦歡涓殑
00 6E 00 04 00 03 00 00 00 24 12 10 4C 12 12 4D
鏀規垚
00 6E 00 04 00 03 00 00 00 24 12 10 4C 12 10 4D
紼嬪簭灝變細杈撳嚭sss111 sss111,鑰屼笉鏄拰鍘熺▼搴忎竴鏍瘋緭鍑簊ss111 sss222,鍥犱負鎴?br /> 浠妸瀵?/span>"sss222"鐨勭浉瀵瑰紩鐢?2鏀規垚浜嗗"sss111"鐨勭浉瀵瑰紩鐢?0.

------------鍒嗗壊綰?br /> public class Test {
   
public static void main(String[] args) {
        String s1
= "sss111";
        String s2
= "sss111";
    }
}

鍦ㄤ笂闈㈢▼搴忎腑瀛樺湪2涓浉鍚岀殑甯擱噺
"sss111",瀵逛簬n涓肩浉鍚岀殑String甯擱噺,鍦–onstant Pool涓?br /> 鍙細鍒涘緩涓涓?鎵浠ュ湪緙栬瘧濂界殑class鏂囦歡涓?鎴戜滑鍙兘鎵懼埌涓涓"sss111"鐨勮〃紺?
000000abh:
08 00 11 01 00 06 73 73 73 31 31 31             ; ......sss111

鍦ㄧ▼搴忔墽琛岀殑鏃跺?Constant Pool浼氬偍瀛樺湪Method Area,鑰屼笉鏄痟eap涓?

鍙﹀,瀵逛簬
""鍐呭涓虹┖鐨勫瓧絎︿覆甯擱噺,浼氬垱寤轟竴涓暱搴︿負0,鍐呭涓虹┖鐨勫瓧絎︿覆鏀懼埌Constant Pool涓?
鑰屼笖Constant Pool鍦ㄨ繍琛屾湡鏄彲浠ュ姩鎬佹墿灞曠殑.

鍏充簬String綾葷殑璇存槑

1.String浣跨敤private final char value[]鏉ュ疄鐜板瓧絎︿覆鐨勫瓨鍌?涔熷氨鏄String瀵硅薄鍒涘緩涔嬪悗,灝變笉鑳?br /> 鍐嶄慨鏀規瀵硅薄涓瓨鍌ㄧ殑瀛楃涓插唴瀹?灝辨槸鍥犱負濡傛,鎵嶈String綾誨瀷鏄笉鍙彉鐨?immutable).

2.String綾繪湁涓涓壒孌婄殑鍒涘緩鏂規硶,灝辨槸浣跨敤""鍙屽紩鍙鋒潵鍒涘緩.渚嬪new String("i am")瀹為檯鍒涘緩浜?涓?br /> String瀵硅薄,涓涓槸"i am"閫氳繃""鍙屽紩鍙峰垱寤虹殑,鍙︿竴涓槸閫氳繃new鍒涘緩鐨?鍙笉榪囦粬浠垱寤虹殑鏃舵湡涓嶅悓,
涓涓槸緙栬瘧鏈?涓涓槸榪愯鏈?/span>!

3.java瀵筍tring綾誨瀷閲嶈澆浜?/span>+鎿嶄綔絎?鍙互鐩存帴浣跨敤+瀵逛袱涓瓧絎︿覆榪涜榪炴帴.

4.榪愯鏈熻皟鐢⊿tring綾葷殑intern()鏂規硶鍙互鍚慡tring Pool涓姩鎬佹坊鍔犲璞?

String鐨勫垱寤烘柟娉?/strong>

涓鑸湁濡備笅鍑犵
1.鐩存帴浣跨敤""寮曞彿鍒涘緩.
2.浣跨敤new String()鍒涘緩.
3.浣跨敤new String("someString")鍒涘緩浠ュ強鍏朵粬鐨勪竴浜涢噸杞芥瀯閫犲嚱鏁板垱寤?
4.浣跨敤閲嶈澆鐨勫瓧絎︿覆榪炴帴鎿嶄綔絎?/span>+鍒涘緩.

闈㈣瘯棰?

String s1 = new String("s1") ;
String s2
= new String("s1") ;
涓婇潰鍒涘緩浜嗗嚑涓猄tring瀵硅薄
?
絳旀:3涓?,緙栬瘧鏈烠onstant Pool涓垱寤?涓?榪愯鏈焗eap涓垱寤?涓?




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娉ㄩ噴-thinking in java(璇諱功絎旇)http://www.tkk7.com/aoneany/articles/303405.html娌欐紶涓殑楸?/dc:creator>娌欐紶涓殑楸?/author>Mon, 23 Nov 2009 16:01:00 GMThttp://www.tkk7.com/aoneany/articles/303405.htmlhttp://www.tkk7.com/aoneany/comments/303405.htmlhttp://www.tkk7.com/aoneany/articles/303405.html#Feedback0http://www.tkk7.com/aoneany/comments/commentRss/303405.htmlhttp://www.tkk7.com/aoneany/services/trackbacks/303405.html娉ㄩ噴涓虹壒孌婄殑interface綾誨瀷錛屼粬浠nterface鍓嶉潰鍔犱竴涓狜絎﹀彿錛屼粬鍙互瀹氫箟鍦ㄤ換浣曞湴鏂癸紙綾伙紝灞炴э紝鏂規硶錛?/p>

@Target(ElementType.TYPE)錛堝彲閫夛級
@interface ClassInfo {
    String created() default "Jan 31 2005";
    String createdBy();
    String lastModified();
    String lastModifiedBy();
    Revision revision();
}
ElementType.TYPE鎻忕粯鏀寔鐨勮寖鍥?br /> ANNOTATION_TYPE, CONSTRUCTOR, METHOD, FIELD, LOCAL_VARIABLE, PARAMETER, PACKAGE, and TYPE
浠栨敮鎸佸畾涔夐粯璁ゅ?br /> 瀹冨彲浠ユ湁0涓厓绱?/p>

@ClassInfo (
    created = "Jan 31 2005",
    createdBy = "James Gosling",
    lastModified = "Jan 31 2005",
    lastModifiedBy = "James Gosling",
    revision = @Revision
)
public class Foo {
    // ...
}



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鍒濅嬌鍖栧拰娓呴櫎-thinking in java璇諱功絎旇http://www.tkk7.com/aoneany/articles/303251.html娌欐紶涓殑楸?/dc:creator>娌欐紶涓殑楸?/author>Sun, 22 Nov 2009 11:08:00 GMThttp://www.tkk7.com/aoneany/articles/303251.htmlhttp://www.tkk7.com/aoneany/comments/303251.htmlhttp://www.tkk7.com/aoneany/articles/303251.html#Feedback0http://www.tkk7.com/aoneany/comments/commentRss/303251.htmlhttp://www.tkk7.com/aoneany/services/trackbacks/303251.htmlfinalize()

宸ヤ綔鍘熺悊搴旇鏄繖鏍風殑錛氫竴鏃﹀瀮鍦炬敹闆嗗櫒鍑嗗濂介噴鏀懼璞″崰鐢ㄧ殑瀛樺偍絀洪棿錛屽畠棣栧厛璋冪敤finalize()錛岃屼笖鍙湁鍦ㄤ笅涓嬈″瀮鍦炬敹闆嗚繃紼嬩腑錛屾墠浼氱湡姝e洖鏀跺璞$殑鍐呭瓨銆?/p>

涓轟粈涔堣浣跨敤finalize()鏂規硶

鍥犱負java鍐呭瓨鍥炴敹涔嬭兘鍥炴敹鑷繁java鑷繁鍒涘緩鐨勫璞★紝鑰屽璋冪敤鏈猨ava鐨勫璞★紝濡侰,C++鍒涘緩鐨勫璞★紝涓嶈兘鑷姩鐨勬竻闄わ紝鍙互閫氳繃鍦╢inalize()鏂規硶錛屽皢榪欎簺瀵硅薄鏄劇ず鐨勬竻闄ゃ?/p>

finalize()鏈鏈夌敤澶勭殑鍦版柟涔嬩竴鏄瀵熷瀮鍦炬敹闆嗙殑榪囩▼銆?/p>

class Chair {
  
static boolean gcrun = false;
  
static boolean f = false;
  
static int created = 0;
  
static int finalized = 0;
  
int i;
  Chair() 
{
    i 
= ++created;
    
if(created == 47
      System.out.println(
"Created 47");
  }

  
protected void finalize() {
    
if(!gcrun) {
      gcrun 
= true;
      System.out.println(
        
"Beginning to finalize after " +
        created 
+ " Chairs have been created");
    }

    
if(i == 47{
      System.out.println(
        
"Finalizing Chair #47, " +
        
"Setting flag to stop Chair creation");
      f 
= true;
    }

    finalized
++;
    
if(finalized >= created)
      System.out.println(
        
"All " + finalized + " finalized");
  }

}


public class Garbage {
  
public static void main(String[] args) {
    
if(args.length == 0{
      System.err.println(
"Usage: \n" +
        
"java Garbage before\n  or:\n" +
        
"java Garbage after");
      
return;
    }

    
while(!Chair.f) {
      
new Chair();
      
new String("To take up space");
    }

    System.out.println(
      
"After all Chairs have been created:\n" +
      
"total created = " + Chair.created +
      
", total finalized = " + Chair.finalized);
    
if(args[0].equals("before")) {
      System.out.println(
"gc():");
      System.gc();
      System.out.println(
"runFinalization():");
      System.runFinalization();
    }

    System.out.println(
"bye!");
    
if(args[0].equals("after"))
      System.runFinalizersOnExit(
true);
  }

}
 ///:~

杈撳叆緇撴灉涓猴細

Created 47
Beginning to finalize after 8694 Chairs have been created
Finalizing Chair #47, Setting flag to stop Chair creation
After all Chairs have been created:
total created = 9834, total finalized = 108
bye!
鎴愬憳鍒濅嬌鍖?/strong>
鍙互鏂規硶璧嬪煎垵浣垮寲鎴愬憳
涓嬮潰榪欐牱鍋氭槸鍚堟硶鐨勶細

class CInit {
int i = f();
int j = g(i);
//...
}

浣嗕笅闈㈣繖鏍峰仛鏄潪娉曠殑錛?br />
class CInit {
int j = g(i);
int i = f();
//...
}
鏋勯犲櫒鍒濅嬌鍖?/strong>
class Counter {
int i;
Counter() { i = 7; }
i棣栧厛浼氬垵濮嬪寲鎴愰浂錛岀劧鍚庡彉鎴?銆?/pre>
1.鍒濅嬌鍖栭『搴?/strong>
鍏堝垵浣垮寲鎴愬憳錛岀劧鍚庢墽琛屾瀯閫犲櫒鍐呭
2.闈欐佹暟鎹垵浣垮寲
 
public class Dog {
    
public static Dog sDog=new Dog("static dog");
    
public Dog(String str){
        System.out.println(str);
    }

    
public static void main(String[] args){
        Dog dog
=new Dog("init");
    }

}
杈撳叆鍑虹粨鏋?/pre>
static dog
init

(1) 綾誨瀷涓篋og鐨勪竴涓璞¢嬈″垱寤烘椂錛屾垨鑰匘og綾葷殑static鏂規硶錛弒tatic瀛楁棣栨璁塊棶鏃訛紝Java瑙i噴鍣ㄥ繀欏繪壘鍒癉og.class錛堝湪浜嬪厛璁懼ソ鐨勭被璺緞閲屾悳绱級銆?br /> (2) 鎵懼埌Dog.class鍚庯紙瀹冧細鍒涘緩涓涓狢lass瀵硅薄錛岃繖灝嗗湪鍚庨潰瀛﹀埌錛夛紝瀹冪殑鎵鏈塻tatic鍒濆鍖栨ā鍧楅兘浼氳繍琛屻傚洜姝わ紝static鍒濆鍖栦粎鍙戠敓涓嬈♀斺斿湪Class瀵硅薄棣栨杞藉叆鐨勬椂鍊欍?br /> (3) 鍒涘緩涓涓猲ew Dog()鏃訛紝Dog瀵硅薄鐨勬瀯寤鴻繘紼嬮鍏堜細鍦ㄥ唴瀛樺爢錛圚eap錛夐噷涓轟竴涓狣og瀵硅薄鍒嗛厤瓚沖澶氱殑瀛樺偍絀洪棿銆?br /> (4) 榪欑瀛樺偍絀洪棿浼氭竻涓洪浂錛屽皢Dog涓殑鎵鏈夊熀鏈被鍨嬭涓哄畠浠殑榛樿鍊鹼紙闆剁敤浜庢暟瀛楋紝浠ュ強boolean鍜宑har鐨勭瓑浠瘋瀹氾級銆?br /> (5) 榪涜瀛楁瀹氫箟鏃跺彂鐢熺殑鎵鏈夊垵濮嬪寲閮戒細鎵ц銆?br /> (6) 鎵ц鏋勫緩鍣ㄣ?/p>

3.鏄庣‘榪涜鐨勯潤鎬佸垵濮嬪寲

class Spoon {  
   
static int i;  
   
static {    
     i 
= 47;  
   }

}
榪欐浠g爜浠呮墽琛屼竴嬈♀斺旈嬈$敓鎴愰偅涓被鐨勪竴涓璞℃椂錛屾垨鑰呴嬈¤闂睘浜庨偅涓被鐨勪竴涓猻tatic鎴愬憳鏃?/pre>
4.闈為潤鎬佸疄渚嬬殑鍒濆鍖?/strong>
class Mug {
  Mug(
int marker) {
    System.out.println(
"Mug(" + marker + ")");
  }

}


public class Mugs {
  Mug c1;
  
{
    c1 
= new Mug(1);
    System.out.println(
"c1 initialized");
  }

  Mugs() 
{
    System.out.println(
"Mugs()");
  }

  
public static void main(String[] args) {
    System.out.println(
"Inside main()");
    Mugs x 
= new Mugs();
  }

}

杈撳叆鍑虹粨鏋?/pre>
Inside main()
Mug(1)
c1 initialized
Mugs()
 


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