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馃洜锔?鏂规硶涓€锛欳lass.newInstance()锛堣繃鏃朵絾缁忓吀锛?/h3>

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java澶嶅埗
Class<?> clazz = Class.forName("com.example.User");
Object user = clazz.newInstance(); // 鐩稿綋浜巒ew User()

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1. 蹇呴』鏈夋棤鍙傛瀯閫犳柟娉曪紙鍚﹀垯鐩存帴鎶涘紓甯革級
2. 宸茬粡琚獲Deprecated鏍囪锛堟柊椤圭洰鍒敤锛?/li>

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馃敡 鏂规硶浜岋細Constructor.newInstance()锛堢幇鍦ㄤ富娴侊級

杩欐墠鏄畼鏂规帹鑽愮殑姝ｇ‘濮垮娍锛佹敮鎸佸悇绉嶅甫鍙傛瀯閫狅紝绋冲緱涓€鎵箏

java澶嶅埗
Constructor<?> constructor = 
    Class.forName("com.example.User")
         .getConstructor(String.class, int.class);
Object user = constructor.newInstance("寮犱笁", 25);

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• 鍙傛暟绫诲瀷椤哄簭鍐欏弽锛堟瘮濡傛妸int鍜孲tring璋冩崲锛?/li>
• 蹇樿澶勭悊InvocationTargetException

馃挕 鈥?strong>鈥嬮獨鎿嶄綔鈥?/strong>鈥嬶細鐢?code>getDeclaredConstructors()鍙互鎷垮埌鎵€鏈夋瀯閫犳柟娉曪紙鍖呮嫭private鐨勶級锛岄厤鍚?code>setAccessible(true)杩炲崟渚嬫ā寮忛兘鑳界牬瑙ｏ紒

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java澶嶅埗
Class<?> clazz = Class.forName("com.example.User");
Constructor<?>[] constructors = clazz.getDeclaredConstructors();

// 闅忎究閫変釜鏋勯€犳柟娉曪紙涓嶅缓璁敓浜х幆澧冭繖涔堢敤锛侊級
Object user = constructors[0].newInstance("鏉庡洓");

馃攳 鈥?strong>鈥嬪弬鏁板尮閰嶇巹瀛︹€?/strong>鈥嬶細

1. 鐢?code>getParameterTypes()鏌ョ湅鍙傛暟绫诲瀷
2. 鐢?code>getParameterAnnotations()鎵炬敞瑙?/li>

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馃挜 鐙鎬ц兘浼樺寲绉樼睄锛堝疄鎴樺共璐э級

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1. 鈥?strong>鈥嬬紦瀛楥onstructor瀵硅薄鈥?/strong>鈥嬶紙鍒瘡娆￠兘閲嶆柊鑾峰彇锛?/li>
2. 鈥?strong>鈥嬪叧闂畨鍏ㄦ鏌モ€?/strong>鈥嬶細constructor.setAccessible(true)
3. 鈥?strong>鈥嬬敤MethodHandle浠ｆ浛鈥?/strong>鈥嬶紙JDK7+鐗规€э級

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鉁?妗嗘灦寮€鍙戯紙姣斿Spring IOC锛?br/> 鉁?鍔ㄦ€佷唬鐞?br/> 鉁?鎻掍欢鍖栨灦鏋?/p>

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鉂?涓氬姟浠ｇ爜棰戠箒璋冪敤
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