鍝庯紝鍒氬Java閭ｄ細鍎匡紝鎴戠湅鐫€鍒汉璋冪敤鏂规硶閮戒笉鐢╪ew瀵硅薄锛屾€ュ緱鎶撹€虫尃鑵紒鍑暐浜哄鐨勫伐鍏锋柟娉曢殢鍙殢鍒帮紝鎴戠殑灏卞緱浼哄€欏璞″ぇ鐖凤紵浠婂ぉ鍜变滑灏辨幇寮€鎻夌璇存竻妤氾紝鈥?strong>鈥媠tatic杩欎釜纾ㄤ汉鐨勫皬濡栫簿鍒板簳鎬庝箞椹湇鈥?/strong>鈥嬨€?/p>

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涓€銆佸畾涔夐潤鎬佹柟娉曠殑姝ｇ‘濮垮娍

鍏堟潵娈典唬鐮佺洿瑙傛劅鍙椾笅锛?/p>

java澶嶅埗
public class StringHelper {
    // 鏅€氭柟娉曪細闇€瑕佸璞″綋闂ㄧエ
    public String toUpperCase(String input) {
        return input.toUpperCase();
    }
    
    // 闈欐€佹柟娉曪細鐩存帴鍒疯劯杩涘満
    public static String reverse(String input) {
        return new StringBuilder(input).reverse().toString();
    }
}

鈥?strong>鈥嬪畾涔夐潤鎬佹柟娉曚笁澶ч搧寰嬧€?/strong>鈥嬶細

1. 鍦ㄦ柟娉曚慨楗扮鍚庨潰鍔犫€?strong>鈥媠tatic鈥?/strong>鈥嬪叧閿瓧
2. 鏂规硶鍐呴儴鈥?strong>鈥嬬姝㈣Е纰伴潪闈欐€佹垚鍛樷€?/strong>鈥嬶紙灏卞儚涓嶈兘鎷垮埆浜虹殑韬唤璇佸紑鎴匡級
3. 璋冪敤鏃垛€?strong>鈥嬬被鍚?鏂规硶鍚嶁€?/strong>鈥嬬洿鎺ュ紑鏁达紙StringHelper.reverse("hello")锛?/li>

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浜屻€佷负浠€涔堟垜鐨勯潤鎬佹柟娉曟€绘姤閿欙紵鏂版墜蹇呯湅閬垮潙鎸囧崡

涓婂懆甯﹀疄涔犵敓鏃讹紝浠栧啓浜嗚繖涔堜釜浠ｇ爜锛?/p>

java澶嶅埗
public class Calculator {
    private int scale = 2;  // 闈為潤鎬佸彉閲?/span>
    
    public static double round(double num) {
        // 杩欓噷璇曞浘浣跨敤scale鍙橀噺 鈫?鐩存帴鎶ラ敊锛?/span>
        return Math.round(num * Math.pow(10, scale)) / Math.pow(10, scale);
    }
}

鈥?strong>鈥嬩笁涓父瑙佹浜￠櫡闃扁€?/strong>鈥嬶細

• 馃毇 璁块棶闈為潤鎬佹垚鍛橈紙濂芥瘮鐢ㄥ埆浜虹殑閾惰鍗″彇閽憋級
• 馃毇 浣跨敤this/super鍏抽敭瀛楋紙閮芥病瀵硅薄鍝潵鐨則his锛?/li>
• 馃毇 閲嶅啓鐖剁被闈欐€佹柟娉曪紙浣犱互涓哄湪閲嶅啓锛屽疄闄呭湪闅愯棌锛?/li>

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涓夈€侀潤鎬佹柟娉晇s鏅€氭柟娉曪紝琛ㄦ牸瀵规瘮绉掓噦宸紓

鈥?strong>鈥嬪姣旈」鈥?/strong>鈥?/th>	鈥?strong>鈥嬮潤鎬佹柟娉曗€?/strong>鈥?/th>	鈥?strong>鈥嬫櫘閫氭柟娉曗€?/strong>鈥?/th>
璋冪敤鏂瑰紡	绫诲悕.鏂规硶鍚?)	瀵硅薄.鏂规硶鍚?)
鍐呭瓨鍒嗛厤	绫诲姞杞芥椂鍒濆鍖?/td>	瀵硅薄瀹炰緥鍖栨椂鍒嗛厤
鍙橀噺璁块棶鑼冨洿	浠呴檺闈欐€佹垚鍛?/td>	鍙闂墍鏈夋垚鍛?/td>
澶氭€佹敮鎸?/td>	涓嶆敮鎸侊紙缂栬瘧鏃剁粦瀹氾級	鏀寔锛堣繍琛屾椂缁戝畾锛?/td>
閫傜敤鍦烘櫙	宸ュ叿鍑芥暟/鍏ㄥ眬閰嶇疆	瀵硅薄鐗规湁琛屼负

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鍥涖€佸疄鎴橈細鍋氫釜甯︾紦瀛樻満鍒剁殑瀛楃涓插鐞嗗伐鍏风被

鍜变滑鏉ョ偣瀹為檯鐨勶紒闇€瑕佸疄鐜帮細

1. 缁熻瀛楃涓插嚭鐜伴鐜?/li>
2. 缂撳瓨鏈€杩?0鏉″鐞嗚褰?/li>

java澶嶅埗
public class StringProcessor {
    private static final LinkedHashMap CACHE = new LinkedHashMap<>() {
        @Override
        protected boolean removeEldestEntry(Map.Entry eldest) {
            return size() > 10;  // 淇濇寔10鏉＄紦瀛?/span>
        }
    };
    
    public static int countFrequency(String text, char target) {
        int count = 0;
        for (char c : text.toCharArray()) {
            if (c == target) count++;
        }
        CACHE.put(text, count);  // 闈欐€佹柟娉曡闂潤鎬佸彉閲?/span>
        return count;
    }
}

鈥?strong>鈥嬭繖閲屾殫钘忎袱涓簿濡欒璁♀€?/strong>鈥嬶細

1. 鐢ㄢ€?strong>鈥婰inkedHashMap鈥?/strong>鈥嬪疄鐜癓RU缂撳瓨娣樻卑鏈哄埗
2. 闈欐€佺紦瀛樺彉閲忚鎵€鏈夋柟娉曞叡浜紝閬垮厤閲嶅璁＄畻

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浜斻€佽€佸徃鏈虹炕杞︾幇鍦猴細鎴戞浘琚玸tatic鍧戣繃鐨勫悕鍦洪潰

涓夊勾鍓嶅仛鐢靛晢绯荤粺锛屾妸鍟嗗搧搴撳瓨璁℃暟鍣ㄥ啓鎴愰潤鎬佸彉閲忥細

java澶嶅埗
public class Inventory {
    private static int stock = 1000;  // 闈欐€佸簱瀛?/span>
    
    public static boolean reduceStock() {
        if(stock > 0) {
            stock--;
            return true;
        }
        return false;
    }
}

缁撴灉闆嗙兢閮ㄧ讲鏃讹紝涓夊彴鏈嶅姟鍣ㄥ悇鑷淮鎶よ嚜宸辩殑搴撳瓨锛岀洿鎺ヨ秴鍗?000浠讹紒鈥?strong>鈥嬭鐨勬暀璁細闈欐€佸彉閲忓湪鍒嗗竷寮忕幆澧冧笅灏辨槸姣掕嵂鈥?/strong>鈥嬨€?/p>

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骞茶繖琛屽叓骞翠簡锛岃鍙ユ帍蹇冪獫瀛愮殑璇濓細鈥?strong>鈥媠tatic鐢ㄥ緱濂芥槸浠ｇ爜鐦﹁韩鍒€锛岀敤涓嶅ソ灏辨槸椤圭洰妫烘潗閽夆€?/strong>鈥嬨€傝浣忎笁涓粷涓嶏細

1. 缁濅笉鎶婁笟鍔℃牳蹇冮€昏緫鍐欐垚闈欐€?/li>
2. 缁濅笉鍦ㄩ潤鎬佹柟娉曢噷鎿嶄綔鏁版嵁搴撹繛鎺?/li>
3. 缁濅笉鎷块潤鎬佸彉閲忓綋鍏ㄥ眬鍨冨溇妗?/li>

涓嬫鐪嬪埌鍚屼簨鍦ㄥ伐鍏风被閲宯ew瀵硅薄锛岀洿鎺ユ妸杩欑瘒鎷嶄粬鑴镐笂锛佺幇鍦ㄧ珛鍒绘墦寮€IDE锛屼翰鎵嬪啓涓甫缂撳瓨鍔熻兘鐨勯潤鎬佸伐鍏风被锛屼繚鍑嗕綘鐖藉埌椋炶捣~