鍝庯紝浣犳湁娌℃湁鎯宠繃杩欎釜闂鈥斺€斾负鍟ユ湁浜涙柟娉曚笉鐢╪ew瀵硅薄灏辫兘鐩存帴璋冪敤锛熶粖澶╁挶浠氨鏉ュ敔鍞犺繖涓鏂版墜鎶撶媯鐨?static鏂规硶"锛屼繚璇佽浣犲惉瀹岀洿鎷嶅ぇ鑵匡細"鍘熸潵杩欎箞鍥炰簨锛?

涓€銆佸伐鍏风被閲岀殑"涓囪兘閽ュ寵"

鈥?strong>鈥媠tatic鏂规硶鏈€鍏稿瀷鐨勫簲鐢ㄥ満鏅氨鏄伐鍏风被鈥?/strong>鈥嬨€傛瘮濡備綘澶╁ぉ鐢ㄧ殑Math.sqrt()锛屽畠灏辨槸涓爣鍑嗙殑static鏂规硶銆備负鍟ヨ杩欎箞璁捐锛熼亾鐞嗗緢绠€鍗曪細璁＄畻骞虫柟鏍硅繖浜嬪効锛岃窡鍏蜂綋瀵硅薄鍗婃瘺閽卞叧绯婚兘娌℃湁鍟婏紒

涓句釜鏍楀瓙馃尠锛?/p>

java澶嶅埗
public class StringUtils {
    public static boolean isEmpty(String str) {
        return str == null || str.trim().length() == 0;
    }
}

浣犵湅杩欎釜鍒ょ┖鏂规硶锛岀敤鐨勬椂鍊欑洿鎺?code>StringUtils.isEmpty("")灏卞畬浜嬩簡锛屾牴鏈笉闇€瑕乶ew涓猄tringUtils瀵硅薄銆傝繖璁捐澶氭竻鐖斤紒

浜屻€佸崟渚嬫ā寮忕殑"鐪嬮棬浜?

鎼炶繃鍗曚緥妯″紡鐨勫悓瀛﹂兘鐭ラ亾锛岄偅涓?code>getInstance()鏂规硶蹇呴』寰楁槸static鐨勩€備负鍟ワ紵鍥犱负浣犺鍦ㄤ笉鍒涘缓瀵硅薄鐨勬儏鍐典笅鑾峰彇鍞竴鐨勫疄渚嬪晩锛?/p>

涓嶈繃杩欓噷瑕佹彁閱掍竴鍙ワ細鈥?strong>鈥嬪崟渚嬭櫧濂斤紝鍙笉瑕佽椽鏉摝鈥?/strong>鈥嬨€傛垜涔嬪墠鎺ユ墜杩囦竴涓」鐩紝婊″睆閮芥槸鍗曚緥锛岀粨鏋滃唴瀛樼洿鎺ョ垎鐐搞€傝鐨勬暀璁憡璇夋垜浠細static鏂规硶鐢ㄥ緱濂芥槸鍒╁櫒锛岀敤涓嶅ソ灏辨槸鍑跺櫒銆?/p>

涓夈€佸伐鍘傛ā寮忕殑"娴佹按绾?

鍒涘缓瀵硅薄鐨勬椂鍊欙紝static鏂规硶绠€鐩村氨鏄釜璐村績灏忔琚勩€傛瘮濡備綘瑕侀€犱釜姹借溅锛?/p>

java澶嶅埗
public class CarFactory {
    public static Car createSUV() {
        return new SUV();
    }
    
    public static Car createSedan() {
        return new Sedan();
    }
}

杩欎箞鍐欑殑濂藉鏄皟鐢ㄧ殑鏃跺€?code>Car myCar = CarFactory.createSUV()锛屾棦鐩磋鍙堟柟渚裤€備笉杩囪娉ㄦ剰锛屸€?strong>鈥嬪伐鍘傛柟娉曡繃澶氫細瀵艰嚧绫昏啫鑳€鈥?/strong>鈥嬶紝杩欐椂鍊欏氨璇ヨ€冭檻鐢ㄦ灇涓炬垨鑰呴厤缃寲浜嗐€?/p>

鍥涖€佸父閲忕鐞嗙殑"澶х瀹?

铏界劧涓ユ牸鏉ヨ甯搁噺搴旇鐢╯tatic final瀛楁锛屼絾閰嶅悎static鏂规硶浣跨敤鏁堟灉鏇翠匠銆傛瘮濡傦細

java澶嶅埗
public class AppConfig {
    private static final int MAX_CONNECTION = 100;
    
    public static int getMaxConnection() {
        return MAX_CONNECTION;
    }
}

杩欎箞灏佽涔嬪悗锛屽摢澶╄鏀规垚浠庨厤缃枃浠惰鍙栵紝鏀硅繖涓€涓湴鏂瑰氨琛屻€傗€?strong>鈥嬫棦淇濊瘉浜嗙伒娲绘€э紝鍙堜笉浼氬埌澶勬暎钀介瓟娉曟暟瀛椻€?/strong>鈥嬨€?/p>

浜斻€佸垵濮嬪寲鍧楃殑"濂芥惌妗?

闈欐€佸垵濮嬪寲鍧楅噷鐢╯tatic鏂规硶閭ｅ彨涓€涓锛佹瘮濡傦細

java澶嶅埗
static {
    loadConfig();
    initCache();
}

private static void loadConfig() {
    // 璇诲彇閰嶇疆鏂囦欢
}

涓嶈繃瑕佺壒鍒敞鎰忥細鈥?strong>鈥嬮潤鎬佸垵濮嬪寲鍧楁墽琛屾椂鏈轰笉鍙帶鈥?/strong>鈥嬶紝鎼炰笉濂藉氨浼氳俯鍧戙€傛垜涔嬪墠灏遍亣鍒拌繃绫诲姞杞介『搴忓鑷寸殑NPE锛屾帓鏌ヤ簡鏁存暣涓ゅぉ锛?/p>

鍐呭瓨浼樺寲涓夊ぇ缁濇嫑

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涓句釜鐪熷疄妗堜緥锛氭垜浠」鐩粍涔嬪墠鏈変釜宸ュ叿绫伙紝鎶婃墍鏈夐厤缃兘鏀惧湪static Map閲岋紝缁撴灉绾夸笂OOM浜嗐€傚悗鏉ユ敼鎴愭噿鍔犺浇+杞紩鐢紝鍐呭瓨绔嬮┈闄嶄簡40%锛?/p>

涓汉瑙傜偣鏃堕棿

璇村彞鎺忓績绐濆瓙鐨勮瘽锛氣€?strong>鈥媠tatic鏂规硶灏卞儚杈ｆ锛岄€傞噺鎻愬懗锛岃繃閲忚鍛解€?/strong>鈥嬨€傚垰鍏ヨ閭ｄ細鍎匡紝鎴戜篃瑙夊緱static鏂规硶鐪熼锛屽埌澶勪贡鐢ㄣ€傜洿鍒版湁娆′唬鐮乺eview琚€佸ぇ楠傚緱鐙楄娣嬪ご锛屾墠鏄庣櫧婊ョ敤static鐨勫悗鏋溿€?/p>

鐜板湪鎴戠殑鍘熷垯鏄細鑳界敤瀹炰緥鏂规硶瑙ｅ喅鐨勶紝缁濆涓嶇敤static銆傞櫎闈炵湡鐨勬槸璺熷璞＄姸鎬佸畬鍏ㄦ棤鍏崇殑宸ュ叿鏂规硶锛屾垨鑰呮槸蹇呴』淇濇寔鍏ㄥ眬鍞竴鐨勫満鏅€傝浣忥紝鈥?strong>鈥嬩唬鐮佹槸缁欎汉鐪嬬殑锛屼笉鏄粰鏈哄櫒鎵ц鐨勨€?/strong>鈥嬶紝鍙淮鎶ゆ€ф案杩滆鏀惧湪绗竴浣嶃€?/p>

鏈€鍚庨€佸ぇ瀹朵竴鍙ヨ瘽锛歴tatic铏藉ソ锛屽彲涓嶈璐澂鍝︼紒涓嬫鍐欎唬鐮佺殑鏃跺€欙紝涓嶅Θ澶氶棶鑷繁涓€鍙ワ細"杩欎釜鏂规硶鐪熺殑闇€瑕乻tatic鍚楋紵" 淇濆噯浣犵殑浠ｇ爜璐ㄩ噺鑳戒笂涓€涓彴闃躲€?/p>