Java涓殑instanceof杩愮畻绗︾敤浜庢鏌ュ璞℃槸鍚︽槸鐗瑰畾绫荤殑瀹炰緥鎴栬€呭疄鐜颁簡鐗瑰畾鎺ュ彛銆傚畠鐨勪娇鐢ㄦ柟寮忔槸灏嗚妫€鏌ョ殑瀵硅薄涓庣洰鏍囩被鎴栨帴鍙ｈ繘琛屾瘮杈冿紝濡傛灉瀵硅薄鏄洰鏍囩被鐨勫疄渚嬫垨瀹炵幇浜嗙洰鏍囨帴鍙ｏ紝鍒欒繑鍥瀟rue锛屽惁鍒欒繑鍥瀎alse銆?/p>

涓嬮潰鏄痠nstanceof杩愮畻绗︾殑浣跨敤绀轰緥锛?/p>

class Animal {}
class Dog extends Animal {}
class Cat extends Animal {}
public class Main {
public static void main(String[] args) {
Animal animal = new Dog();
System.out.println(animal instanceof Animal);  // true
System.out.println(animal instanceof Dog);     // true
System.out.println(animal instanceof Cat);     // false
}
}

鍦ㄤ笂闈㈢殑绀轰緥涓紝Dog绫荤户鎵胯嚜Animal绫伙紝Cat绫讳篃缁ф壙鑷?code>Animal绫汇€傚湪main鏂规硶涓紝鎴戜滑鍒涘缓浜嗕竴涓?code>Dog瀵硅薄锛屽苟灏嗗叾璧嬪€肩粰Animal绫诲瀷鐨勫彉閲?code>animal銆傜劧鍚庝娇鐢?code>instanceof杩愮畻绗︽潵妫€鏌?code>animal瀵硅薄鏄惁鏄?code>Animal绫荤殑瀹炰緥銆?code>Dog绫荤殑瀹炰緥鍜?code>Cat绫荤殑瀹炰緥銆傚洜涓?code>animal瀵硅薄鏄?code>Dog绫荤殑瀹炰緥锛屾墍浠ョ2涓拰绗?涓?code>println璇彞杩斿洖true鍜宖alse銆?/p>

娉ㄦ剰锛?code>instanceof杩愮畻绗﹁繕鍙互鐢ㄤ簬鍒ゆ柇瀵硅薄鏄惁鏄煇涓被鐨勫瓙绫荤殑瀹炰緥銆傚湪涓婇潰鐨勭ず渚嬩腑锛?code>Dog绫绘槸Animal绫荤殑瀛愮被锛屾墍浠?code>animal instanceof Animal杩斿洖true銆?/p>