{"id":59881,"date":"2026-01-14T16:26:10","date_gmt":"2026-01-14T08:26:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/59881.html"},"modified":"2026-01-14T16:26:10","modified_gmt":"2026-01-14T08:26:10","slug":"flutter-%e9%9b%b6%e5%9f%ba%e7%a1%80%e5%85%a5%e9%97%a8%ef%bc%88%e5%8d%81%e4%ba%94%ef%bc%89%ef%bc%9a%e7%bb%a7%e6%89%bf%e3%80%81%e5%a4%9a%e6%80%81%e4%b8%8e%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e4%b8%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/59881.html","title":{"rendered":"Flutter 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\u91cd\u5199&#xff08;override&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u591a\u6001&#xff08;Polymorphism&#xff09;<\/li>\n<li>\n<ul>\n<li>1\ufe0f\u20e3 \u4ec0\u4e48\u662f\u591a\u6001&#xff1f;<\/li>\n<li>2\ufe0f\u20e3 \u591a\u6001\u793a\u4f8b<\/li>\n<li>3\ufe0f\u20e3 \u9762\u5411\u62bd\u8c61\u7f16\u7a0b<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u4e09\u5927\u7279\u6027\u5982\u4f55\u534f\u540c\u5de5\u4f5c&#xff1f;<\/li>\n<li>\u4e03\u3001Flutter \u4e3a\u4ec0\u4e48\u5927\u91cf\u4f9d\u8d56\u4e09\u5927\u7279\u6027&#xff1f;<\/li>\n<li>\u516b\u3001\u65b0\u624b\u5e38\u89c1\u8bef\u533a<\/li>\n<li>\u4e5d\u3001\u8fd9\u4e00\u7bc7\u4f60\u771f\u6b63\u638c\u63e1\u4e86\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u5341\u3001\u603b\u7ed3<\/li>\n<li>&#x1f51c; \u4e0b\u4e00\u7bc7\u9884\u544a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p> 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\/>\n<h3>\u4e00\u3001\u4ec0\u4e48\u662f\u9762\u5411\u5bf9\u8c61&#xff1f;<\/h3>\n<p>\u4e00\u53e5\u8bdd\u7406\u89e3&#xff1a;<\/p>\n<p>\u7528\u201c\u5bf9\u8c61\u201d\u6765\u63cf\u8ff0\u771f\u5b9e\u4e16\u754c\u4e2d\u7684\u4e8b\u7269<\/p>\n<p>\u5bf9\u8c61&#xff1a;<\/p>\n<ul>\n<li>\u6709\u5c5e\u6027&#xff08;\u6570\u636e&#xff09;<\/li>\n<li>\u6709\u884c\u4e3a&#xff08;\u65b9\u6cd5&#xff09;<\/li>\n<\/ul>\n<p>Dart\u3001Flutter \u90fd\u662f\u5f3a\u9762\u5411\u5bf9\u8c61\u4f53\u7cfb\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u9762\u5411\u5bf9\u8c61\u4e09\u5927\u7279\u6027\u6982\u89c8<\/h3>\n<table>\n<tr>\u7279\u6027\u89e3\u51b3\u7684\u95ee\u9898<\/tr>\n<tbody>\n<tr>\n<td>\u5c01\u88c5<\/td>\n<td>\u9690\u85cf\u7ec6\u8282&#xff0c;\u63a7\u5236\u4f7f\u7528\u65b9\u5f0f<\/td>\n<\/tr>\n<tr>\n<td>\u7ee7\u627f<\/td>\n<td>\u590d\u7528\u4ee3\u7801&#xff0c;\u5efa\u7acb\u5c42\u7ea7\u5173\u7cfb<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u6001<\/td>\n<td>\u9762\u5411\u62bd\u8c61\u7f16\u7a0b&#xff0c;\u89e3\u8026\u903b\u8f91<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u9010\u4e00\u62c6\u89e3\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u5c01\u88c5&#xff08;Encapsulation&#xff09;<\/h3>\n<h4>1\ufe0f\u20e3 \u4ec0\u4e48\u662f\u5c01\u88c5&#xff1f;<\/h4>\n<p>\u5c01\u88c5\u7684\u6838\u5fc3\u662f&#xff1a;<\/p>\n<p>\u53ea\u66b4\u9732\u201c\u8be5\u66b4\u9732\u7684\u201d&#xff0c;\u9690\u85cf\u201c\u4e0d\u8be5\u5173\u5fc3\u7684\u201d<\/p>\n<hr \/>\n<h4>2\ufe0f\u20e3 Dart \u4e2d\u7684\u5c01\u88c5\u4f53\u73b0<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> _password<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>_password<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>_password \u662f\u79c1\u6709\u5c5e\u6027<\/li>\n<li>\u5916\u90e8\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee<\/li>\n<\/ul>\n<p>&#x1f4cc; \u4e0b\u5212\u7ebf _ \u662f Dart \u7684\u79c1\u6709\u7ea6\u5b9a&#xff08;\u5e93\u7ea7\u79c1\u6709&#xff09;\u3002<\/p>\n<hr \/>\n<h4>3\ufe0f\u20e3 \u4e3a\u4ec0\u4e48\u8981\u5c01\u88c5&#xff1f;<\/h4>\n<ul>\n<li>\u9632\u6b62\u8bef\u7528<\/li>\n<li>\u964d\u4f4e\u8026\u5408<\/li>\n<li>\u63d0\u9ad8\u5b89\u5168\u6027<\/li>\n<\/ul>\n<p>Flutter \u4e2d\u7684\u5f88\u591a\u7c7b&#xff1a; &#x1f449; \u4f60\u53ea\u80fd\u7528&#xff0c;\u4e0d\u80fd\u4e71\u6539<\/p>\n<hr \/>\n<h3>\u56db\u3001\u7ee7\u627f&#xff08;Inheritance&#xff09;<\/h3>\n<h4>1\ufe0f\u20e3 \u4ec0\u4e48\u662f\u7ee7\u627f&#xff1f;<\/h4>\n<p>\u7ee7\u627f\u8868\u793a&#xff1a;<\/p>\n<p>\u5b50\u7c7b\u62e5\u6709\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/p>\n<hr \/>\n<h4>2\ufe0f\u20e3 Dart \u4e2d\u7684\u7ee7\u627f<\/h4>\n<p>class Animal {<br \/>\n  void move() {<br \/>\n    print(&#039;moving&#039;);<br \/>\n  }<br \/>\n}<\/p>\n<p>class Dog extends Animal {<br \/>\n  void bark() {<br \/>\n    print(&#039;bark&#039;);<br \/>\n  }<br \/>\n}<\/p>\n<p>Dog&#xff1a;<\/p>\n<ul>\n<li>\u81ea\u52a8\u62e5\u6709 move<\/li>\n<li>\u8fd8\u53ef\u4ee5\u65b0\u589e\u81ea\u5df1\u7684\u884c\u4e3a<\/li>\n<\/ul>\n<hr \/>\n<h4>3\ufe0f\u20e3 \u91cd\u5199&#xff08;override&#xff09;<\/h4>\n<p>class Dog extends Animal {<br \/>\n  &#064;override<br \/>\n  void move() {<br \/>\n    print(&#039;Dog is running&#039;);<br \/>\n  }<br \/>\n}<\/p>\n<p>&#x1f4cc; \u7528 &#064;override \u660e\u786e\u8868\u793a\u91cd\u5199\u7236\u7c7b\u884c\u4e3a\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u591a\u6001&#xff08;Polymorphism&#xff09;<\/h3>\n<p>\u8fd9\u662f\u6700\u91cd\u8981\u3001\u4e5f\u662f\u6700\u62bd\u8c61\u7684\u4e00\u70b9\u3002<\/p>\n<hr \/>\n<h4>1\ufe0f\u20e3 \u4ec0\u4e48\u662f\u591a\u6001&#xff1f;<\/h4>\n<p>\u4e00\u53e5\u8bdd\u7406\u89e3&#xff1a;<\/p>\n<p>\u540c\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u4e0d\u540c\u5bf9\u8c61&#xff0c;\u6709\u4e0d\u540c\u8868\u73b0<\/p>\n<hr \/>\n<h4>2\ufe0f\u20e3 \u591a\u6001\u793a\u4f8b<\/h4>\n<p>abstract class Animal {<br \/>\n  void move();<br \/>\n}<\/p>\n<p>class Dog extends Animal {<br \/>\n  &#064;override<br \/>\n  void move() {<br \/>\n    print(&#039;Dog runs&#039;);<br \/>\n  }<br \/>\n}<\/p>\n<p>class Bird extends Animal {<br \/>\n  &#064;override<br \/>\n  void move() {<br \/>\n    print(&#039;Bird flies&#039;);<br \/>\n  }<br \/>\n}<\/p>\n<hr \/>\n<h4>3\ufe0f\u20e3 \u9762\u5411\u62bd\u8c61\u7f16\u7a0b<\/h4>\n<p>void makeMove(Animal animal) {<br \/>\n  animal.move();<br \/>\n}<\/p>\n<p>\u8fd9\u91cc&#xff1a;<\/p>\n<ul>\n<li>\u4e0d\u5173\u5fc3\u5177\u4f53\u7c7b\u578b<\/li>\n<li>\u53ea\u5173\u5fc3\u662f\u5426\u9075\u5b88 Animal \u89c4\u5219<\/li>\n<\/ul>\n<p>&#x1f4cc; \u8fd9\u5c31\u662f\u591a\u6001\u7684\u7cbe\u9ad3\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001\u4e09\u5927\u7279\u6027\u5982\u4f55\u534f\u540c\u5de5\u4f5c&#xff1f;<\/h3>\n<p>\u6765\u770b\u4e00\u4e2a\u5b8c\u6574\u793a\u4f8b&#xff1a;<\/p>\n<p>abstract class Shape {<br \/>\n  double area();<br \/>\n}<\/p>\n<p>class Circle extends Shape {<br \/>\n  final double r;<\/p>\n<p>  Circle(this.r);<\/p>\n<p>  &#064;override<br \/>\n  double area() {<br \/>\n    return 3.14 * r * r;<br \/>\n  }<br \/>\n}<\/p>\n<p>class Square extends Shape {<br \/>\n  final double side;<\/p>\n<p>  Square(this.side);<\/p>\n<p>  &#064;override<br \/>\n  double area() {<br \/>\n    return side * side;<br \/>\n  }<br \/>\n}<\/p>\n<p>\u7edf\u4e00\u4f7f\u7528&#xff1a;<\/p>\n<p>void printArea(Shape shape) {<br \/>\n  print(shape.area());<br \/>\n}<\/p>\n<p>&#x1f4cc; \u8fd9\u5c31\u662f&#xff1a;<\/p>\n<ul>\n<li>\u5c01\u88c5&#xff1a;\u9690\u85cf\u8ba1\u7b97\u7ec6\u8282<\/li>\n<li>\u7ee7\u627f&#xff1a;\u5171\u4eab Shape \u89c4\u5219<\/li>\n<li>\u591a\u6001&#xff1a;\u4e0d\u540c\u5f62\u72b6\u4e0d\u540c\u5b9e\u73b0<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e03\u3001Flutter \u4e3a\u4ec0\u4e48\u5927\u91cf\u4f9d\u8d56\u4e09\u5927\u7279\u6027&#xff1f;<\/h3>\n<p>Flutter \u672c\u8d28\u4e0a\u662f&#xff1a;<\/p>\n<p>\u4e00\u4e2a\u7531\u65e0\u6570 Widget \u7ec4\u6210\u7684\u9762\u5411\u5bf9\u8c61\u7cfb\u7edf<\/p>\n<ul>\n<li>Widget \u662f\u62bd\u8c61\u6982\u5ff5<\/li>\n<li>StatelessWidget \/ StatefulWidget \u662f\u7ee7\u627f<\/li>\n<li>build \u65b9\u6cd5\u662f\u591a\u6001<\/li>\n<\/ul>\n<p>\u4f60\u5b66\u5230\u8fd9\u91cc&#xff0c;\u5df2\u7ecf\u7ad9\u5728\u4e86 Flutter \u8bbe\u8ba1\u7684\u95e8\u53e3\u3002<\/p>\n<hr \/>\n<h3>\u516b\u3001\u65b0\u624b\u5e38\u89c1\u8bef\u533a<\/h3>\n<p>\u274c \u8fc7\u5ea6\u7ee7\u627f \u274c \u7c7b\u5c42\u7ea7\u592a\u6df1 \u274c \u7528\u7ee7\u627f\u89e3\u51b3\u6240\u6709\u95ee\u9898<\/p>\n<p>&#x1f4cc; Flutter \u66f4\u504f\u5411&#xff1a;<\/p>\n<p>\u7ec4\u5408 &gt; \u7ee7\u627f<\/p>\n<p>&#xff08;\u8fd9\u4e2a\u601d\u60f3\u540e\u9762\u4f1a\u4e13\u95e8\u8bb2&#xff09;<\/p>\n<hr 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