鍝庯紝浣犳槸涓嶆槸鍒氬Java鐨勬椂鍊欙紝缁忓父琚?瀵硅薄瀹炰緥鍖?銆?鏂规硶璋冪敤"杩欎簺鏈缁曟檿锛熸槑鏄庣収鐫€鏁欐潗鏁蹭唬鐮侊紝鎬庝箞涓€杩愯灏辨姤閿欙紵鍒厡锛屼粖澶╁挶浠氨鐢ㄥぇ鐧借瘽鎶婅繖浜嬪効鎺版壇娓呮锛?/p>

锛堝亣瑁呭枬浜嗗彛鍜栧暋锛夊挶鍏堣浣忚繖鍙ヨ瘽锛氣€?strong>鈥婮ava涓栫晫閲岋紝鎯宠鐢ㄧ被閲岀殑鏂规硶锛屽緱鍏堟湁涓疄浣撳璞♀€斺€斿氨鍍忔兂寮€姹借溅寰楀厛鏈夎締鐪熻溅锛佲€?/strong>鈥?/p>

涓€銆佷负鍟ラ潪瑕?new"涓璞★紵

锛堟暡榛戞澘锛夋敞鎰忓暒锛佹柊鎵嬫渶甯歌俯鐨勫潙灏辨槸鐩存帴璋冩柟娉曪細

java澶嶅埗
Car.run();  // 鐩存帴鎶ラ敊锛?/span>

杩欏氨濂芥瘮浣犲鐫€绌烘皵鍠?寮€杞︼紒"锛岀幇瀹炲悧锛熲€?strong>鈥嬬被灏卞儚姹借溅璁捐鍥剧焊锛屾柟娉曞氨鏄浘绾镐笂鐨勫姛鑳借鏄庛€傛病鏈夊疄浣撹溅锛屾€庝箞鎵ц鍏蜂綋鎿嶄綔锛熲€?/strong>鈥?/p>

涓変釜蹇呴』瀹炰緥鍖栫殑鐞嗙敱锛?/p>

1. 鈥?strong>鈥嬪唴瀛樺垎閰嶁€?/strong>鈥嬶細new鎿嶄綔浼氬湪鍐呭瓨閲屽垝鍑轰笓灞炵┖闂?/li>
2. 鈥?strong>鈥嬬姸鎬佺嫭绔嬧€?/strong>鈥嬶細姣忚締杞︽湁鍚勮嚜鐨勬补閲忋€侀噷绋嬫暟
3. 鈥?strong>鈥嬪畨鍏ㄩ殧绂烩€?/strong>鈥嬶細閬垮厤澶氫釜鎿嶄綔浜掔浉骞叉壈

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浜屻€佹墜鎶婃墜鏁欎綘浜旀鎿嶄綔娉?/h3>

锛堟嬁鍑烘暀闉級閲嶇偣鏉ヤ簡锛佸挶浠敤澶栧崠绯荤粺涓句釜鐜板疄妗堜緥锛?/p>

java澶嶅埗
// 绗竴姝ワ細鍐欑被妯℃澘
class TakeoutSystem {
    // 绗簩姝ワ細鍐欐柟娉?/span>
    public void confirmOrder(String food) {
        System.out.println(food + "宸叉帴鍗曪紒");
    }
}

public static void main(String[] args) {
    // 绗笁姝ワ細瀹炰緥鍖栧璞★紙閲嶇偣锛侊級
    TakeoutSystem meituan = new TakeoutSystem();
    
    // 绗洓姝ワ細鐐瑰彿鎿嶄綔绗﹁皟鐢?/span>
    // 绗簲姝ワ細浼犲弬鎵ц
    meituan.confirmOrder("榛勭剸楦＄背楗?);
}

杩愯缁撴灉锛?code>榛勭剸楦＄背楗凡鎺ュ崟锛?/code>

锛堢獊鐒舵媿妗岋級娉ㄦ剰锛佹湁浜涘悓瀛︿細蹇樿new灏辩洿鎺ヨ皟鐢紝杩欐椂鍊欐姤鐨?code>NullPointerException锛屽氨鏄疛ava鍦ㄨ锛?澶у摜锛屼綘璋冪敤鐨勫璞¤繕鏄釜绌烘皵鍟婏紒"

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涓夈€侀潤鎬佹柟娉曟槸涓壒渚嬶紵

锛堟帹鐪奸暅锛夋湁鍚屽涓炬墜闂細鑰佸笀锛屾垜瑙佽繃涓嶇敤new灏辫兘璋冪殑鏂规硶鍟婏紒姣斿Math.random()

娌￠敊锛佽繖灏辨槸鈥?strong>鈥嬮潤鎬佹柟娉曗€?/strong>鈥嬬殑鐗规畩寰呴亣锛?/p>

java澶嶅埗
class Calculator {
    // static鍏抽敭瀛楁爣璁?/span>
    public static int add(int a, int b) {
        return a + b;
    }
}

// 鐩存帴閫氳繃绫诲悕璋冪敤
Calculator.add(3,5);  // 杈撳嚭8

浣嗚娉ㄦ剰锛堢獊鐒朵弗鑲冿級锛?/p>

• 闈欐€佹柟娉曚笉鑳借皟鐢ㄩ潪闈欐€佹垚鍛?/li>
• 浣跨敤鍦烘櫙锛氬伐鍏风被鏂规硶锛堟瘮濡傛暟瀛﹁绠楋級
• 鐢熷懡鍛ㄦ湡闅忕被鍔犺浇寮€濮嬶紝姣斿璞℃洿鏃╁瓨鍦?/li>

璇寸櫧浜嗭紝鈥?strong>鈥嬮潤鎬佹柟娉曞氨鍍忓叕鐢ㄧ數璇濓紝璋侀兘鑳界敤锛涢潪闈欐€佹柟娉曞氨鍍忎釜浜烘墜鏈猴紝蹇呴』灞炰簬鐗瑰畾瀵硅薄鈥?/strong>鈥?/p>

鍥涖€佽法鍖呰皟鐢ㄦ€庝箞鐮达紵

锛堝垏鍒伴棶棰樺満鏅級鍋囪鐜板湪瑕佹妸澶栧崠绯荤粺鎷嗘垚澶氫釜鍖咃細

com.meituan.login  // 鐧诲綍妯″潡
com.meituan.order  // 璁㈠崟妯″潡

瑕佸湪鐧诲綍妯″潡璋冪敤璁㈠崟鏂规硶锛屼笁姝ヨ蛋锛?/p>

1. 鈥?strong>鈥嬪鍖呰鍙モ€?/strong>鈥嬶細import com.meituan.order.*;
2. 鈥?strong>鈥嬭闂潈闄愨€?/strong>鈥嬶細纭繚鏂规硶鏄痯ublic绾у埆
3. 鈥?strong>鈥嬪畬鏁磋矾寰勨€?/strong>鈥嬶紙澶囬€夋柟妗堬級锛?code>new com.meituan.order.TakeoutSystem()

锛堢獊鐒跺帇浣庡０闊筹級璇翠釜琛屼笟鍐呭箷锛氬緢澶氬垵绾х▼搴忓憳鏍藉湪package鍛藉悕瑙勮寖涓婏紝鍒囪涓嶈鐢ㄤ腑鏂囨嫾闊崇缉鍐欙紒

浜斻€佷釜浜鸿俯鍧戠粡楠岃皥

锛堝垏璋堝績妯″紡锛夊垰宸ヤ綔閭ｄ細鍎匡紝鎴戝湪璋冪敤绗笁鏂筳ar鍖呮柟娉曟椂锛屾娲昏幏鍙栦笉鍒拌繑鍥炲€笺€傚悗鏉ュ彂鐜版槸鐗堟湰鍐茬獊鈥斺€旀柊鐗堟湰鏂规硶鍙傛暟澶氫簡涓€涓猙oolean绫诲瀷锛?/p>

鍑犱釜閬垮潙閿﹀泭锛?/p>

1. 鈥?strong>鈥嬪鎬佽皟鐢ㄢ€?/strong>鈥嬫椂锛屽厛纭瀹為檯瀵硅薄绫诲瀷
2. 鈥?strong>鈥嬮噸杞芥柟娉曗€?/strong>鈥嬭鐪嬫竻鍙傛暟绫诲瀷鍜屾暟閲?/li>
3. 浣跨敤IDE鐨勨€?strong>鈥嬫柟娉曟彁绀哄姛鑳解€?/strong>鈥嬶紙Ctrl+绌烘牸锛?/li>
4. 澶嶆潅椤圭洰鍠勭敤鈥?strong>鈥嬪崟鍏冩祴璇曗€?/strong>鈥嬮獙璇佹柟娉曡皟鐢?/li>

锛堢獊鐒剁瑧鍦猴級杩樿寰楁湁娆℃繁澶滃姞鐝紝鍥犱负鎶?code>getUser()鍐欐垚getUsers()锛岀粨鏋滅▼搴忚繑鍥炰簡500鏉℃暟鎹?..锛堟憡鎵嬶級

鍏€佷綘鍙兘娌℃兂鍒扮殑鍐风煡璇?/h3>

锛堢绉樺叜鍏級鐭ラ亾涓轰粈涔圝ava瑕佹妸鏂规硶鍜屾暟鎹皝瑁呭湪绫婚噷鍚楋紵杩欏叾瀹炴槸鈥?strong>鈥嬮潰鍚戝璞＄紪绋嬬殑灏佽鐗规€р€?/strong>鈥嬪湪鎾戣叞锛?/p>

涓変釜闅愯棌濂藉锛?/p>

1. 鈥?strong>鈥嬫潈闄愭帶鍒垛€?/strong>鈥嬶細鐢╬rivate/protected鍐冲畾鏂规硶鍙鎬?/li>
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锛堢獊鐒舵彁楂樺０璋冿級2023骞碨tackOverflow璋冩煡鏄剧ず锛屸€?strong>鈥?7%鐨凧ava寮傚父鎶ラ敊涓庨敊璇柟娉曡皟鐢ㄧ浉鍏斥€?/strong>鈥嬶紒鍙鎺屾彙鍩虹澶氶噸瑕?/p>

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鏈€鍚庣殑鍞犲彣锛堜笉鏄€荤粨锛侊級

鏁欎簡杩欎箞澶氬勾Java锛屽彂鐜板緢澶氬悓瀛︽€绘兂璺宠繃鍩虹鐩村妗嗘灦銆備絾浣犵湅锛岃繛鏈€鍩虹鐨勬柟娉曡皟鐢ㄩ兘鏈夎繖涔堝闂ㄩ亾锛屾槸涓嶆槸璇ユ矇涓嬪績鎵撳ソ鍩虹锛?/p>

锛堣閲嶅績闀匡級璁颁綇锛氣€?strong>鈥嬬紪绋嬪氨鍍忔惌绉湪锛岀被涓庢柟娉曟槸鍩虹鐮栧潡銆傜幇鍦ㄥ鑺变竴灏忔椂鐞嗚В閫忥紝鍚庨潰鑳界渷鍗佸皬鏃禿ebug鏃堕棿鈥?/strong>鈥嬨€備笅娆￠亣鍒版柟娉曡皟鐢ㄩ棶棰橈紝鍏堥棶鑷繁涓変釜闂锛?/p>

1. 瀵硅薄new浜嗗悧锛?/li>
2. 鏉冮檺澶熷悧锛?/li>
3. 鍙傛暟瀵瑰悧锛?/li>

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