\u6211\u4eec\u90fd\u77e5\u9053\uff0c\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7684\u4e09\u5927\u7279\u6027\u4e4b\u4e00\uff0c\u6bd4\u5982\u5728\u6211\u4eec\u5411\u96c6\u5408\u4e2d\u6dfb\u52a0\u5143\u7d20\u7684\u8fc7\u7a0b\u4e2dadd()\u65b9\u6cd5\u91cc\u586b\u5165\u7684\u662fObject\u7c7b\uff0c\u800cObject\u53c8\u662f\u6240\u6709\u7c7b\u7684\u7236\u7c7b\uff0c\u8fd9\u5c31\u4ea7\u751f\u4e86\u4e00\u4e2a\u95ee\u9898\u2014\u2014\u6dfb\u52a0\u7684\u7c7b\u578b\u65e0\u6cd5\u505a\u5230\u7edf\u4e00 \u7531\u6b64\u5c31\u53ef\u80fd\u4ea7\u751f\u5728\u904d\u5386\u96c6\u5408\u53d6\u51fa\u5143\u7d20\u65f6\u7c7b\u578b\u4e0d\u7edf\u4e00\u800c\u62a5\u9519\u95ee\u9898\u3002<\/p>\n
\u4f8b\u5982\uff1a\u6211\u5411\u4e00\u4e2aArrayList\u96c6\u5408\u4e2d\u6dfb\u52a0Person\u7c7b\u7684\u5bf9\u8c61\uff0c\u4f46\u662f\u4e0d\u5c0f\u5fc3\u624b\u8d31\u6dfb\u52a0\u4e86\u4e00\u4e2aBoy\u7c7b\u7684\u5bf9\u8c61\uff0c\u8fd9\u5c31\u4f1a\u5bfc\u81f4\u5982\u4e0b\u7ed3\u679c<\/p>\n
<\/p>\n
\u4f20\u7edf\u7684\u65b9\u5f0f\u4e0d\u80fd\u5bf9\u52a0\u5165\u5230\u96c6\u5408ArrayList\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u7ea6\u675f(\u4e0d\u5b89\u5168)\u904d\u5386\u7684\u65f6\u5019\uff0c\u9700\u8981\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362,\u5982\u679c\u96c6\u5408\u4e2d\u7684\u6570\u636e\u91cf\u8f83\u5927\uff0c\u5bf9\u6548\u7387\u6709\u5f71\u54cd \u8fd9\u5c31\u6781\u5927\u5730\u964d\u4f4e\u4e86\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\uff0c\u56e0\u6b64\u8bbe\u8ba1\u8005\u9488\u5bf9\u6b64\u95ee\u9898\u5f15\u5165\u4e86\u6cdb\u578b\uff01<\/p>\n
\u66f4\u591a\u96c6\u5408\u7cfb\u5217\u6559\u7a0b\uff1ahttps:\/\/www.javastack.cn\/cate…<\/a><\/p>\n 1.\u63d0\u5347\u4e86\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u548c\u89c4\u8303\u6027<\/p>\n \u9488\u5bf9\u4e0a\u8ff0\u95ee\u9898\uff0c\u5f53\u6211\u4eec\u91c7\u7528\u6cdb\u578b\u5c31\u4f1a\u663e\u5f97\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u8981\u5728\u7f16\u8bd1\u7c7b\u578b\u540e\u5229\u7528\u6cdb\u578b\u6307\u5b9a\u4e00\u4e2a\u7279\u5b9a\u7c7b\u578b\uff0c\u7f16\u8bd1\u5668\u5c31\u4f1a\u81ea\u52a8\u68c0\u6d4b\u51fa\u4e0d\u7b26\u5408\u89c4\u8303\u7684\u7c7b\u5e76\u629b\u51fa\u9519\u8bef\u63d0\u793a<\/p>\n 2.\u7f16\u8bd1\u65f6,\u68c0\u67e5\u6dfb\u52a0\u5143\u7d20\u7684\u7c7b\u578b\uff0c\u63d0\u9ad8\u4e86\u5b89\u5168\u6027<\/p>\n 3.\u51cf\u5c11\u4e86\u7c7b\u578b\u8f6c\u6362\u7684\u6b21\u6570,\u63d0\u9ad8\u6548\u7387<\/p>\n 4.\u5728\u7c7b\u58f0\u660e\u65f6\u901a\u8fc7\u4e00\u4e2a\u6807\u8bc6\u53ef\u4ee5\u8868\u793a\u5c5e\u6027\u7c7b\u578b\u3001\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u3001\u53c2\u6570\u7c7b\u578b<\/p>\n \u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a\u4e0a\u8ff0\u7684class Person< E >\u4e2d\u7684\u201cE\u201d\u76f8\u5f53\u4e8e\u8fd9\u91cc\u7684E\u662f\u4e00\u4e2a\u8eaf\u58f3 \u5360\u4f4d\u7528\u7684 \u4ee5\u540e\u5b9a\u4e49\u7684\u65f6\u5019\u7a0b\u5e8f\u5458\u53ef\u4ee5\u81ea\u5df1\u53bb\u81ea\u5b9a\u4e49<\/p>\n \u5c31\u50cf\u8fd9\u6837<\/p>\n \u66fe\u7ecf\u5199\u63a5\u53e3\u7684\u65f6\u5019\u90fd\u6ca1\u6709\u5b9a\u4e49\u6cdb\u578b\uff0c\u5b83\u9ed8\u8ba4\u7684\u5c31\u662fObject\u7c7b\uff0c\u5176\u5b9e\u8fd9\u6837\u5199\u662f\u4e0d\u89c4\u8303\u7684\uff01<\/p>\n \u5982\u679c\u8bf4\u63a5\u53e3\u7684\u5b58\u5728\u662f\u4e00\u79cd\u89c4\u8303\uff0c\u90a3\u6cdb\u578b\u63a5\u53e3\u5c31\u662f\u89c4\u8303\u4e2d\u7684\u89c4\u8303<\/p>\n \u5728\u4e0a\u8ff0\u7684\u6cdb\u578b\u63a5\u53e3\u4e2d\u5df2\u7ecf\u89c4\u5b9a\u4f20\u5165\u5176\u4e2d\u7684\u5fc5\u987b\u662fU\uff0cR\u7c7b\u7684\u5bf9\u8c61\uff0c\u90a3\u4e48\u5f53\u6211\u4eec\u4f20\u5165\u5176\u4ed6\u7c7b\u7684\u5bf9\u8c61\u65f6\u5c31\u4f1a\u62a5\u9519\uff0c\u5982\u56fe\uff1a<\/p>\n \u6839\u636e\u89c4\u5219\uff0c\u5f53\u6211\u4eec\u5b9e\u73b0\u63a5\u53e3\u65f6\uff0c\u5c31\u5fc5\u987b\u5b9e\u73b0\u4ed6\u7684\u6240\u6709\u65b9\u6cd5\uff0c\u800c\u5728\u8fd9\u65f6\u6211\u4eec\u5c31\u53ef\u4ee5\u5411<U,R>\u4e2d\u4f20\u5165\u6211\u4eec\u81ea\u5df1\u89c4\u5b9a\u7684\u7c7b\u3002\u5728IDEA\u4e2d\u91cd\u5199\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u65f6\uff0c\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5c06<U,R>\u66ff\u6362\u6210\u6211\u4eec\u4e8b\u5148\u89c4\u5b9a\u7684\u7c7b\u3002<\/p>\n 1.\u4f7f\u7528\u6cdb\u578b\u65b9\u5f0f\u7ed9HashSet\u4e2d\u653e\u5165\u4e09\u4e2a\u5b66\u751f\u5bf9\u8c61\uff0c\u5e76\u8f93\u51fa\u5bf9\u8c61\u4fe1\u606f<\/p>\n \u4e0a\u8ff0\u7684 \u6cdb\u578b\u4e2dStudent\u7684\u662f\u6211\u4e8b\u5148\u5b9a\u4e49\u597d\u7684\u4e00\u4e2a\u7c7b\uff0c\u628a\u5b83\u653e\u5230\u5176\u4e2d\u4f5c\u4e3a\u6cdb\u578b\u6765\u7ea6\u675f\u4f20\u5165\u7684\u5bf9\u8c61\uff0c\u4ee5\u53ca\u5728\u904d\u5386\u65f6\u51cf\u5c11\u8f6c\u578b\u7684\u6b21\u6570\u63d0\u9ad8\u6548\u7387<\/p>\n 2.\u4f7f\u7528\u6cdb\u578b\u65b9\u5f0f\u7ed9HashMap\u4e2d\u653e\u5165\u4e09\u4e2a\u5b66\u751f\u5bf9\u8c61\uff0c\u5e76\u8f93\u51fa\u5bf9\u8c61\u4fe1\u606f<\/p>\n HashMap\u662f\u4e00\u4e2a\u53cc\u5217\u96c6\u5408\uff0c\u4ee5[K-V]\u7684\u65b9\u5f0f\u5b58\u50a8\u5bf9\u8c61\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u6cdb\u578b\u65f6\u8981\u5411\u5176\u4e2d\u4f20\u5165\u4e24\u4e2a\u7c7b\u578b<\/p>\n \u6211\u4eec\u90fd\u77e5\u9053\u4f7f\u7528\u8fed\u4ee3\u5668\u904d\u5386HashMap\u65f6\u8981\u5148\u901a\u8fc7 \u5728\u7ed9\u6cdb\u578b\u6307\u5b9a\u5177\u4f53\u7c7b\u578b\u540e\uff0c\u53ef\u4ee5\u4f20\u5165\u8be5\u7c7b\u578b\u6216\u8005\u5176\u5b50\u7c7b\u7c7b\u578b<\/p>\n \u5728\u5f62\u53c2\u5217\u8868\u4e2d\u4f20\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0e\u6cdb\u578b\u4e0d\u4e00\u81f4\u65f6\u4f1a\u62a5\u9519\uff0c\u4f53\u73b0\u89c4\u8303\u6027<\/p><\/blockquote>\n \u8fd9\u91cc\u7684\u81ea\u52a8\u88c5\u7bb1\u5f88\u6709\u610f\u601d\uff0c\u4ed6\u662f\u5728\u4e09\u4e2a\u7c7b\u578b\u4e2d\u81ea\u52a8\u5339\u914d\u5f53\u524d\u8f93\u5165\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u4e0d\u7528\u8003\u8651\u987a\u5e8f\u95ee\u9898\uff0c\u5982\u56fe\u6240\u793a<\/p>\n \u2460\u6cdb\u578b\u6570\u7ec4\u4e0d\u80fd\u521d\u59cb\u5316\uff0c\u56e0\u4e3a\u6570\u7ec4\u5728 new \u4e0d\u80fd\u786e\u5b9aA \u7684\u7c7b\u578b\uff0c\u5c31\u65e0\u6cd5\u5728\u5185\u5b58\u5f00\u7a7a\u95f4<\/p>\n \u9519\u8bef\u5199\u6cd5: A[] a=new A[];<\/p>\n \u2461\u9759\u6001\u65b9\u6cd5\u4e0d\u80fd\u4f7f\u7528\u7c7b\u5b9a\u4e49\u7684\u6cdb\u578b<\/p>\n \u539f\u56e0\u662f\u9759\u6001\u6210\u5458\u662f\u548c\u7c7b\u76f8\u5173\u7684,\u5728\u7c7b\u52a0\u8f7d\u65f6,\u5bf9\u8c61\u8fd8\u6ca1\u6709\u521b\u5efa\u6240\u4ee5\uff0c\u5982\u679c\u9759\u6001\u65b9\u6cd5\u548c\u9759\u6001\u5c5e\u6027\u4f7f\u7528\u4e86\u6cdb\u578b\uff0cJVM\u5c31\u65e0\u6cd5\u5b8c\u6210\u521d\u59cb\u5316\u3002<\/p>\n \u6765\u6e90\uff1aiyu77.blog.csdn.net\/article\/details\/125304857<\/p>\n \u8fd1\u671f\u70ed\u6587\u63a8\u8350\uff1a<\/strong><\/p>\n 1.1,000+ \u9053 Java\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u6574\u7406(2022\u6700\u65b0\u7248)<\/a><\/p>\n 2.\u52b2\u7206\uff01Java \u534f\u7a0b\u8981\u6765\u4e86\u3002\u3002\u3002<\/a><\/p>\n 3.Spring Boot 2.x \u6559\u7a0b\uff0c\u592a\u5168\u4e86\uff01<\/a><\/p>\n 4.\u522b\u518d\u5199\u6ee1\u5c4f\u7684\u7206\u7206\u7206\u70b8\u7c7b\u4e86\uff0c\u8bd5\u8bd5\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u8fd9\u624d\u662f\u4f18\u96c5\u7684\u65b9\u5f0f\uff01\uff01<\/a><\/p>\n\u4e8c\u3001\u4f7f\u7528\u6cdb\u578b\u7684\u597d\u5904<\/strong><\/h2>\n
<\/p>\n
\n
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\n
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class Person<E> {\n E s; \/\/\u53ef\u4ee5\u662f\u5c5e\u6027\u7c7b\u578b\n public Person(E s) { \/\/\u53ef\u4ee5\u662f\u53c2\u6570\u7c7b\u578b\n this.s = s;\n }\n public E f() { \/\/\u53ef\u4ee5\u662f\u8fd4\u56de\u7c7b\u578b\n return s;\n }\n public void show() {\n System.out.println(s.getClass()); \/\/\u663e\u793aS\u7684\u8fd0\u884c\u7c7b\u578b\n }\n}<\/code><\/pre>\npublic static void main(String[] args) {\n Person<String> person1 = new Person<String>("xxxx");\/\/ E->String\n person.show();\n Person<Integer> person2 = new Person<Integer>(123); \/\/ E->Integer\n person.show();\n}\n\u8fd0\u884c\u7ed3\u679c\uff1a\nclass java.lang.String\nclass java.lang.Integer<\/code><\/pre>\n\u4e09\u3001\u6cdb\u578b\u5e38\u89c1\u7528\u6cd5<\/strong><\/h2>\n
1.\u5b9a\u4e49\u6cdb\u578b\u63a5\u53e3<\/strong><\/h3>\n
interface Im<U,R>{\n void hi(R r);\n void hello(R r1,R r2,U u1,U u2);\n default R method(U u){\n return null;\n }\n}<\/code><\/pre>\n<\/p>\n
2.\u5b9a\u4e49\u6cdb\u578b\u96c6\u5408<\/strong><\/h3>\n
HashSet<Student> students = new HashSet<Student>();\n students.add(new Student("\u61d2\u7f8a\u7f8a",21));\n students.add(new Student("\u559c\u7f8a\u7f8a",41));\n students.add(new Student("\u7f8e\u7f8a\u7f8a",13));\n for (Student student :students) {\n System.out.println(student);\n }<\/code><\/pre>\nHashMap<String, Student> hm = new HashMap<String, Student>();\n\/\/ K-> String V->Student\u4e0e\u4e0b\u9762\u7684\u5bf9\u5e94\nhm.put("001",new Student("\u559c\u7f8a\u7f8a",21));\nhm.put("002",new Student("\u61d2\u7f8a\u7f8a",32));\nhm.put("003",new Student("\u7f8e\u7f8a\u7f8a",43));\nSet<Map.Entry<String,Student>> ek=hm.entrySet();\nIterator<Map.Entry<String, Student>> iterator = ek.iterator();\/\/\u53d6\u51fa\u8fed\u4ee3\u5668\nwhile (iterator.hasNext()) {\n Map.Entry<String, Student> next = iterator.next();\n System.out.println(next.getKey()+" - "+next.getValue());\n}<\/code><\/pre>\nentrySet()<\/code>\u53d6\u51fa\u952e\u503c\u5bf9\uff0c\u7136\u540e\u901a\u8fc7\u8f6c\u578b\u5f97\u5230\u5bf9\u5e94\u7684\u7c7b\u6765\u5f97\u5230\u5bf9\u8c61\u4fe1\u606f\u3002\u800c\u5728\u4f7f\u7528\u6cdb\u578b\u5b9a\u4e49[K-V]<\/code>\u5c31\u89c4\u5b9a\u4e86\u53d6\u51fa\u7684\u952e\u503c\u5bf9\u7684\u7c7b\u578b\uff0c\u6240\u4ee5\u5c31\u7701\u53bb\u4e86\u8f6c\u578b\u8fd9\u4e00\u6b65\u9aa4\uff0c\u540c\u6837\u4e5f\u4f7f\u7a0b\u5e8f\u53d8\u5f97\u7b80\u5355\uff0c\u9ad8\u6548<\/p><\/blockquote>\n\u56db\u3001\u6cdb\u578b\u4f7f\u7528\u7ec6\u8282<\/strong><\/h2>\n
1.<>\u4e2d\u7c7b\u578b\u89c4\u8303<\/strong><\/h3>\n
<\/p>\n
2.\u7ee7\u627f\u6027\u4f53\u73b0<\/strong><\/h3>\n
P<A> ap = new P<A>(new A());\nP<A> ap1 = new P<A>(new B()); \/\/A\u7684\u5b50\u7c7b\nclass A {}\nclass B extends A{}<\/code><\/pre>\n3.\u7b80\u5199\u5f62\u5f0f<\/strong><\/h3>\n
P<A> ap = new P(new A());<\/code><\/pre>\n\u4e94\u3001\u81ea\u5b9a\u4e49\u6cdb\u578b<\/strong><\/h2>\n
1.\u81ea\u5b9a\u4e49\u65b9\u6cd5\u4f7f\u7528\u7c7b\u58f0\u660e\u7684\u6cdb\u578b<\/strong><\/h3>\n
public static void main(String[] args) {\n U<String, Double, Integer> u = new U<>();\n u.hi("hello", 1.0); \/\/X->String Y->Double\n}\nclass U<X, Y, Z> {\n public void hi(X x, Y y) {} \/\/\u4f7f\u7528\u7c7b\u58f0\u660e\u7684\u6cdb\u578b\n}<\/code><\/pre>\n2.\u81ea\u5b9a\u4e49\u6cdb\u578b\u65b9\u6cd5<\/strong><\/h3>\n
public static void main(String[] args) {\n U<String, Double, Integer> u = new U<>();\n u.m1("xx",22);\n \/\/\u5f53\u8c03\u7528\u65b9\u6cd5\u65f6\uff0c\u4f20\u5165\u53c2\u6570\u7f16\u8bd1\u5668\u4f1a\u81ea\u5df1\u786e\u5b9a\u7c7b\u578b \u4f1a\u81ea\u52a8\u88c5\u7bb1\n}\nclass U<X, Y, Z> {\n public <X,Y> void m1(X x,Y y){} \/\/\u81ea\u5b9a\u4e49\u6cdb\u578b\u65b9\u6cd5\n}<\/code><\/pre>\n<\/p>\n
3.\u6ce8\u610f\u4e8b\u9879<\/strong><\/h3>\n
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