1.鐢ㄥ紩鐢ㄦ搷綰靛璞?/h3>
Java涓竴鍒囬兘瑙嗕負瀵硅薄錛屼絾瀹為檯鎿嶄綔瀵硅薄鏄竴涓?#8220;寮曠敤”(reference)鏍囪瘑絎︺?br />
榪欏氨濡傛灉錛岄仴鎺у櫒(寮曠敤)鎿嶄綔鐢佃(瀵硅薄)涓鏍鳳紝鎴戜滑鎷跨潃閬ユ帶鍣ㄥ氨鑳戒笌鐢佃鏈轟繚鎸佽繛鎺ャ傚鏋滄兂瑕佽皟鏁撮煶閲忓ぇ灝忔垨鑰呮洿鎹㈤閬撴椂錛屾垜浠疄闄呬笂鏄搷浣滅殑閬ユ帶鍣紝鍐嶇敱鎺у埗鍣ㄨ皟鎺х數瑙嗘満銆傛垜浠彲浠ュ甫鐫鎺у埗鍣ㄥ湪鎴塊棿鍥涘璧板姩錛屽悓鏍蜂篃鍙互鎿嶄綔鐢佃鏈恒?br />
鎺у埗鍣ㄥ拰鐢佃鏈烘槸鍚屾椂鍙互鍗曠嫭瀛樺湪鐨勶紝娌℃湁鐢佃鏈猴紝閬ユ帶鍣ㄤ篃鍙崟鐙瓨鍦ㄣ?br />
String s;
鍦ㄤ笂闈㈡垜浠垱寤轟簡涓涓猄tring鐨勫紩鐢紝浣嗗畠鍙槸涓鏍峰紩鐢紝騫舵湭涓庝換浣曚竴涓璞＄浉鍏寵仈錛屽鏋滀綘灝濊瘯鍚憇鍙戦佹秷鎭紝鍒欎細寰楀埌涓涓繍琛屾椂寮傚父錛屾墍浠ヤ竴縐嶅畨鍏ㄧ殑鍋氭硶鏄紝鍦ㄦ垜浠垱寤轟竴涓紩鐢ㄥ悓鏃朵究涓鴻繘琛屽垵濮嬪寲銆?br />
String s = "init";
涓婇潰鐨凷tring鏄疛ava涓殑涓縐嶇壒孌婄被鍨嬶紝鎵浠ュ彲浠ョ洿鎺ヤ嬌鐢ㄥ甫寮曞彿鐨勬枃鏈繘琛屽垵濮嬪寲錛岄氬父錛屽繀欏誨Java涓殑瀵硅薄閲囩敤涓縐嶆洿閫氱敤鐨勫垵濮嬪寲鏂規硶銆?br />
2.蹇呴』鐢辮嚜宸卞垱寤烘墍鏈夌殑瀵硅薄
閫氬父鎴戜滑浣跨敤new鎿嶄綔絎︽潵鍒涘緩涓涓璞°?br />
String s = new String("init");
涓婇潰鏄垱寤轟竴涓猄tring瀵硅薄鍚屾椂鍒濆鍖栧茍鎶婅瀵硅薄鐨勫紩鐢ㄨ祴鍊肩粰s錛屾鏃秙渚挎槸涓涓璞＄殑寮曠敤(s騫墮潪鏄竴涓璞★紝鍙槸涓涓紩鐢?銆?br />
2.1.瀛樺偍浣嶇疆
Java涓湁5涓笉鍚岀殑鏁版嵁瀛樺偍鍖猴細
1).瀵勫瓨鍣細瀹冧綅浜庡鐞嗗櫒鍐呴儴鏄渶蹇殑瀛樺偍鍖恒備絾瀵勫瓨鍣ㄦ瀬鍏舵湁闄愶紝瀹冩槸鏍規嵁闇姹傝繘琛屽垎閰嶏紝鎴戜滑涓嶈兘鐩存帴鎿嶄綔涔熶笉鑳藉湪紼嬪簭涓劅瑙夊埌瀹冪殑瀛樺湪銆?br />
2).鍫嗘爤錛?/strong>浣嶄簬閫氱敤RAM(闅忔満璁塊棶瀛樺偍鍣?涓氳繃鍫嗘爤鎸囬拡鍙互澶勭悊鍣ㄥ摢閲屾搷浣滃爢鏍堛傛寚閽堝悜涓嬬Щ鍔ㄥ垯鍒嗛厤鏂扮殑鍐呭瓨錛涜嫢鍚戜笂縐誨姩鍒欓噴鏀鵑偅浜涘唴瀛橈紝閫熷害鍏浜庡瓨鍌ㄥ櫒錛屼絾Java蹇呴』鐭ラ亾瀛樺偍鍦ㄥ爢鏍堝唴鎵鏈夐」鐨勭‘鍒囩敓鍛藉懆鏈燂紝浠ヤ究涓婁笅縐誨姩鎸囬拡銆傝繖闄愬埗浜嗙▼搴忕殑鐏墊椿鎬э紝鎵浠ュ彧鏈夋煇浜汮ava鏁版嵁瀛樺偍浜庡爢鏍堜腑(瀵硅薄鐨勫紩鐢?錛孞ava瀵硅薄騫朵笉瀛樻斁浜庡叾涓?br />
3).鍫嗭細閫氱敤鐨勫唴瀛樻睜錛岀敤浜庡瓨鏀炬墍鏈夌殑Java瀵硅薄銆傚瓨鍌ㄥ湪鍫嗛噷鐨勬暟鎹紪璇戝櫒涓嶉渶瑕佺煡閬撳瓨媧誨闀挎椂闂淬傚綋浣跨敤new鍒涘緩涓涓璞℃椂錛屼細鑷姩鍦ㄥ爢閲屽瓨鍌ㄥ垎閰嶃備負浜嗚繖縐嶇伒媧繪т篃鐗虹壊鏇村鐨勬椂闂淬?br />
4).甯擱噺瀛樺偍錛?/strong>甯擱噺閫氳繃鐩存帴瀛樻斁浜庝唬鐮佺殑鍐呴儴錛屽洜涓轟粬浠案榪滀笉浼氳鏀瑰彉銆?br />
5).闈濺AM瀛樺偍錛?/strong>璇ュ瓨鍌ㄤ簬紼嬪簭涔嬪錛屽嵆浣跨▼搴忓仠姝緷鐒朵繚鎸佽嚜宸辯殑鐘舵佸(嫻佸璞★紝鎸佷箙鍖栧璞?銆傚璞¤漿鍖栦負瀛楄妭嫻侊紝鍙戦佺粰鍙︿竴鍙版満鍣紝“鎸佷箙鍖栧璞?#8221;鍗沖璞¤瀛樺偍浜庣鐩樻垨鑰呭叾浠栧獟浠嬩笂錛屽湪闇瑕佹椂鍙仮澶嶅父瑙勫璞°?br />
2.2.鍩烘湰鏁版嵁綾誨瀷
鍦↗ava涓粡甯哥敤鍒拌繖鏍蜂竴緋誨垪鐗規畩瀵硅薄鐨?#8220;鍩烘湰綾誨瀷”錛宯ew鍒涘緩瀵硅薄浼氬瓨鍌ㄥ湪“鍫?#8221;閲岋紝濡傛灉鏄竴浜涚壒鍒皬鐨勩佺畝鍗曠殑綾誨瀷錛屽線寰涓嶆槸閭ｄ箞鏈夋晥錛屽湪Java涓彁渚涗竴浜涗笉闇瑕佷嬌鐢╪ew鍒涘緩鍙橀噺錛岃屾槸鍒涘緩涓涓?span style="color: red;">騫墮潪寮曠敤鐨?#8220;鑷姩”鍙橀噺銆傝繖涓彉閲忕洿鎺ュ瓨鍌?#8220;鍊?#8221;騫跺瓨鏀句簬鍫嗘爤涓?br />
Java涓殑鎵鏈夊熀鏈被鍨嬫墍鍗犵殑瀛樺偍絀洪棿澶у皬鏄浐瀹氱殑錛屼笉浼氬洜涓虹‖浠舵灦鏋勫彉鍖栬屽彉鍖栥?br />
3.絎竴涓狫ava紼嬪簭
package com.onlyeffort.java.concurrency;
// 鍙浛鎹負錛歩mport java.util.*;
import java.util.Random;
//瀹氫箟涓涓叕鍏辯被鍚嶄負錛欻elloWorld
public class HelloWorld {
// main鏂規硶錛岀▼搴忕殑鍏ュ彛錛岀粨鏋勪笉鍙彉錛屼富浣撳彲鍙?/span>
public static void main(String[] args) {
// body start..澶ф嫭鍙峰紑濮?br />
// 鍒涘緩涓涓璞?/span>
HelloWorld hw = new HelloWorld();
// 浣跨敤hw寮曠敤璋冪敤say鏂規硶
System.out.println(hw.say());
// body end..澶ф嫭鍙風粨鏉?/span>
}
/**
*
* @return 榪斿洖涓涓瓧絎︿覆,騫舵墦鍑哄嚭鍊?
*/
public String say() {
Random rand = new Random();
return "Hello,World!" + rand.nextInt();
}
}
絎竴琛屼負鍖呭０鏄庤鍙ワ紝鍖呭悕鍏ㄤ負灝忓啓錛屼竴鑸負鍩熷悕鐨勫弽杞艦寮忥紝闃叉鍑虹幇鍐茬獊錛屽洜涓哄煙鍚嶅湪鍏ㄧ悆鏄敮涓鐨勩?br />
褰撴垜浠渶瑕佷嬌鐢ㄥ叾瀹冨叕鍏辯殑綾葷粍浠舵椂闇瑕佷嬌鐢╥mport璇彞寮曞叆綾匯備絾java緙栬瘧鍣ㄥ湪姣忎釜Java鏂囦歡緙栬瘧鏃朵細鑷姩寮曠敤java.lang.*;涓嬮潰鐨勬墍鏈夌被錛屽彧鏄痩ang鍖呬笅闈㈢殑鎵鏈夛紝浣嗗茍涓嶅寘鍚玪ang涓嬮潰鐨勫瓙鍖咃紝濡傛灉鎴戜滑闇瑕佷嬌鐢╦ava.lang.reflect.Array;鏃訛紝榪橀渶瑕佹垜浠墜鍔ㄥ紩鐢ㄣ?br />
main鏂規硶鏄疛ava榪愯鏃剁▼搴忕殑鍏ュ彛錛岀粨鏋勫崟涓涓嶅彲鏀瑰彉銆傚湪main鏂規硶涓垜浠垱寤轟簡涓涓狧elloWorld瀵硅薄錛屽茍鎶婂畠璧嬪肩粰hw錛屾鏃秇w鏄竴涓狧elloWorld瀵硅薄鐨勪竴涓紩鐢紝hw騫墮潪鏄竴涓璞°傚湪鍚庨潰鎴戜滑璋冪敤浜咹elloWorld鐨剆ay鏂規硶錛屾鏂規硶榪斿洖涓涓瓧絎︿覆錛屽湪say鏂規硶涓紝鎴戜滑鍒涘緩浜嗕竴涓殢鏈烘暟錛屽茍鎶婂畠涓庝竴涓瓧絎︿覆鐩歌繛鎺ャ俽and.nextInt()鏂規硶浼氳繑鍥炰竴涓猧nt綾誨瀷鐨勬暣鏁幫紝榪欓噷Java緙栬瘧鍣ㄤ細鎵ц綾誨瀷杞崲錛屾妸int綾誨瀷杞崲涓篠tring綾誨瀷騫舵墽琛屽瓧絎︿覆榪炴帴銆傚湪鏈鍚庢垜浠嬌鐢ㄤ簡return璇彞榪斿洖榪欎釜鏂規硶鐨勮繑鍥炲箋?br />
return鍦↗ava紼嬪簭涓湁涓ょ浣滅敤錛屼竴錛氫細緇撴潫褰撳墠鏂規硶(return;);浜岋細榪斿洖鏌愪釜鏂規硶鐨勮繑鍥炲?return value;)銆?br />
鍦ㄨ繖涓狧elloWorld涓嚭鐜頒簡“//”銆?#8220;/***/”榪欓兘鏄疛ava褰撲腑鐨勬敞閲娿侸ava緙栬瘧鍣ㄧ紪璇戞椂浼氬拷鐣ユ敞閲婂悗闈㈢殑鎵鏈夊唴瀹廣?br />
]]>
// 鍙浛鎹負錛歩mport java.util.*;
import java.util.Random;
//瀹氫箟涓涓叕鍏辯被鍚嶄負錛欻elloWorld
public class HelloWorld {
// main鏂規硶錛岀▼搴忕殑鍏ュ彛錛岀粨鏋勪笉鍙彉錛屼富浣撳彲鍙?/span>
public static void main(String[] args) {
// body start..澶ф嫭鍙峰紑濮?br /> // 鍒涘緩涓涓璞?/span>
HelloWorld hw = new HelloWorld();
// 浣跨敤hw寮曠敤璋冪敤say鏂規硶
System.out.println(hw.say());
// body end..澶ф嫭鍙風粨鏉?/span>
}
/**
*
* @return 榪斿洖涓涓瓧絎︿覆,騫舵墦鍑哄嚭鍊?
*/
public String say() {
Random rand = new Random();
return "Hello,World!" + rand.nextInt();
}
}