{"id":137,"date":"2023-05-11T21:08:10","date_gmt":"2023-05-11T13:08:10","guid":{"rendered":"https:\/\/www.escook.cn\/?p=137"},"modified":"2023-09-26T21:09:43","modified_gmt":"2023-09-26T13:09:43","slug":"dart-%e5%9f%ba%e7%a1%80-final-%e5%92%8c-const","status":"publish","type":"post","link":"https:\/\/www.escook.cn\/index.php\/2023\/05\/11\/dart-%e5%9f%ba%e7%a1%80-final-%e5%92%8c-const\/","title":{"rendered":"Dart \u57fa\u7840 – final \u548c const"},"content":{"rendered":"
\n

\u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe<\/strong> \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01<\/p>\n<\/blockquote>\n

1. final \u548c const \u7684\u5171\u540c\u70b9<\/h2>\n

\u65e0\u8bba\u662f final<\/strong> \u8fd8\u662f const<\/strong>\uff0c\u90fd\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u90a3\u4e9b\u4e0d\u5141\u8bb8\u88ab\u4fee\u6539<\/strong>\u7684\u53d8\u91cf\u503c\u3002\u8fd9\u4e00\u7279\u70b9\u548c\u5176\u5b83\u8bed\u8a00\u4e2d\u7684\u201c\u5e38\u91cf\u201d\u7c7b\u4f3c\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n

void main(List<String> args) {\n  \/\/ 1. \u4f7f\u7528 final \u5b9a\u4e49\u5e38\u91cf name \u5e76\u8d4b\u503c\n  final String name = 'zs';\n  print(name);\n\n  \/\/ 2. \u4f7f\u7528 const \u5b9a\u4e49\u5e38\u91cf nickname \u5e76\u8d4b\u503c\n  const String nickname = 'ls';\n  print(nickname);\n\n  \/\/ 3. \u65e0\u8bba name \u8fd8\u662f nickname \u90fd\u65e0\u6cd5\u4f7f\u7528 = \u91cd\u65b0\u8d4b\u503c\uff0c\n  \/\/    \u6240\u4ee5\u4e0b\u9762\u7684\u4e24\u884c\u4ee3\u7801\u4f1a\u7f16\u8bd1\u5931\u8d25\n  name = 'liulongbin';\n  nickname = 'escook';\n}<\/code><\/pre>\n
\u56e0\u6b64\uff0c\u6211\u4eec\u4eca\u540e\u5982\u679c\u60f3\u5b9a\u4e49\u5e38\u91cf<\/strong>\u5e76\u7acb\u5373\u8d4b\u521d\u503c<\/strong>\uff08\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u521d\u503c\u7279\u6307\u660e\u786e\u7684\u5b57\u9762\u91cf\u503c<\/strong>\uff09\uff0c\u65e0\u8bba\u4f7f\u7528 final \u8fd8\u662f const \u90fd\u53ef\u4ee5\u3002<\/p>\n
2. final \u548c const \u7684\u533a\u522b<\/h2>\n
\u6b63\u6240\u8c13\u5b58\u5728\u5373\u5408\u7406\uff0cdart \u65e2\u7136\u63d0\u4f9b\u4e86 final \u548c const \u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\uff0c\u90a3\u4e48\u5b83\u4eec\u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f<\/strong>\u4e0b\u80af\u5b9a\u5b58\u5728\u5dee\u522b\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5e76\u638c\u63e1\u4ee5\u4e0b 3 \u70b9\u533a\u522b\u3002<\/p>\n
2.1 \u533a\u522b 1<\/h3>\n
\n
const \u8868\u793a\u7f16\u8bd1\u65f6\u5fc5\u987b\u7ed9\u51fa\u786e\u5207\u7684\u6700\u7ec8\u503c<\/strong>\uff0cfinal \u8868\u793a\u8fd0\u884c\u65f6\u53ef\u4ee5\u52a8\u6001\u751f\u6210<\/strong>\u4e00\u4e2a\u6700\u7ec8\u7684\u503c\u3002<\/p>\n<\/blockquote>\n
\u7b2c\u4e00\u4e2a\u533a\u522b\u662f\u6700\u91cd\u8981\u7684\u3002\u638c\u63e1\u7b2c\u4e00\u4e2a\u533a\u522b\u7684\u5173\u952e<\/strong>\u662f\u80fd\u5426\u6b63\u786e\u533a\u5206<\/strong>\u4ec0\u4e48\u53eb\u201c\u786e\u5207\u7684\u6700\u7ec8\u503c<\/strong>\u201d\uff0c\u4ec0\u4e48\u53eb\u201c\u52a8\u6001\u751f\u6210\u6700\u7ec8\u503c<\/strong>\u201d\u3002<\/p>\n
    \n
  1. \u786e\u5207\u7684\u6700\u7ec8\u503c\uff1a\u5373\u5b57\u9762\u91cf\u503c\uff0c\u4f8b\u5982\u6570\u5b57 1<\/code>\uff0c\u5b57\u7b26\u4e32 'abc'<\/code>\uff0c\u5e03\u5c14\u503c true<\/code>\uff0c\u5bf9\u8c61\u3001\u6570\u7ec4\u7b49\u90fd\u662f\u660e\u786e\u7684\u503c\u3002<\/li>\n
  2. \u52a8\u6001\u751f\u6210\u6700\u7ec8\u503c\uff1a\u5373\u503c\u662f\u52a8\u6001\u751f\u6210\u7684\uff0c\u4f8b\u5982\u968f\u673a\u6570<\/strong>\u3001\u52a8\u6001\u83b7\u53d6\u7cfb\u7edf\u7684\u65f6\u95f4<\/strong>\u7b49\u3002<\/li>\n<\/ol>\n
    \u4f8b\u5982\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u52a8\u6001\u751f\u6210\u4e86 10 \u4ee5\u5185\u7684\u968f\u673a\u6574\u6570\uff0c\u5e76\u628a\u968f\u673a\u751f\u6210\u7684\u6574\u6570\u8d4b\u503c\u7ed9\u5e38\u91cf age\uff0c\u6b64\u65f6\u5b9a\u4e49\u5e38\u91cf age \u65f6\u4e0d\u80fd\u4f7f\u7528 const\uff0c\u53ea\u80fd\u4f7f\u7528 final\uff1a<\/p>\n
    \/\/ \u5bfc\u5165 \u6838\u5fc3\u7c7b\u5e93 math\nimport 'dart:math';\n\nvoid main(List<String> args) {\n  \/\/ \u8c03\u7528 Random() \u5f97\u5230\u4e00\u4e2a\u968f\u673a\u6570\u751f\u6210\u5668\n  \/\/ \u518d\u8c03\u7528\u968f\u673a\u6570\u751f\u6210\u5668\u7684 nextInt(n) \u51fd\u6570\uff0c\u751f\u6210 0-n \u4e4b\u95f4\u7684\u968f\u673a\u6574\u6570\uff08\u5305\u62ec0\uff0c\u4f46\u4e0d\u5305\u62ecn\uff09\n  \/\/ \u8fd9\u91cc\u4e0d\u80fd\u7528 const\uff0c\u53ea\u80fd\u7528 final\u3002\u56e0\u4e3a Random().nextInt(10) \u7684\u503c\u201c\u662f\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7684\u201d\uff01\n  final int age = Random().nextInt(10);\n  print(age);\n}<\/code><\/pre>\n
    \u518d\u4f8b\u5982\uff0c\u628a\u5f53\u524d\u65f6\u95f4\u8d4b\u503c\u7ed9\u5e38\u91cf dt\uff0c\u5728\u5b9a\u4e49\u5e38\u91cf dt \u65f6\u4e0d\u80fd\u4f7f\u7528 const\uff0c\u53ea\u80fd\u7528 final\u3002\u56e0\u4e3a dt \u7684\u503c\u4e0d\u662f\u5199\u6b7b\u7684\u5b57\u9762\u91cf\u503c\uff0c\u800c\u662f\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7684\uff1a<\/p>\n
    void main(List<String> args) {\n  \/\/ \u8fd9\u91cc\u53ea\u80fd\u7528 final\n  final DateTime dt = DateTime.now();\n  print(dt);\n}<\/code><\/pre>\n
    \u6700\u540e\uff0c\u8fd8\u6709\u4e00\u4e2a\u6ce8\u610f\u70b9\u9700\u8981\u7279\u522b\u63d0\u9192\u4e0b\uff1a\u5982\u679c\u6211\u4eec\u60f3\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u5e38\u91cf\uff0c\u968f\u540e\u518d\u7ed9\u8fd9\u4e2a\u5e38\u91cf\u8d4b\u503c\uff0c\u6b64\u65f6\u53ea\u80fd\u7528 final\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    void main(List<String> args) {\n  \/\/ 1. \u4f7f\u7528 final \u5148\u5b9a\u4e49\u540d\u4e3a name \u7684\u7a7a\u767d\u5e38\u91cf\n  final String name;\n  \/\/ 2. \u5728\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u52a8\u6001\u628a\u5e38\u91cf name \u7684\u503c\u8d4b\u503c\u4e3a\u5b57\u7b26\u4e32 'liulongbin'\n  name = 'liulongbin';\n  print(name);\n}<\/code><\/pre>\n
    2.2 \u533a\u522b 2<\/h3>\n
    \n
    const \u5b9a\u4e49\u7684\u5e38\u91cf\u503c\u5728\u5185\u5b58\u4e2d\u4f1a\u88ab\u590d\u7528\uff1bfinal \u5b9a\u4e49\u7684\u5e38\u91cf\u54ea\u6015\u503c\u76f8\u540c\uff0c\u5728\u5185\u5b58\u4e2d\u4e5f\u4f1a\u88ab\u91cd\u590d\u5b9a\u4e49\u3002<\/p>\n<\/blockquote>\n
    \u4f7f\u7528 const \u5b9a\u4e49\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u6570\u7ec4\uff0c\u5206\u522b\u662f s1 \u548c s2\u3002\u8c03\u7528 identical(\u5bf9\u8c611, \u5bf9\u8c612)<\/code> \u51fd\u6570\u53ef\u4ee5\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u662f\u5426\u76f8\u540c\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    void main(List<String> args) {\n  \/\/ \u4f7f\u7528 const \u5b9a\u4e49\u4e24\u4e2a\u5e38\u91cf s1 \u548c s2\uff0c\u5206\u522b\u6307\u5411\u201c\u81ea\u5df1\u7684\u201d\u5b57\u9762\u91cf\u6570\u7ec4\n  const List<String> s1 = ['a', 'b', 'c'];\n  const List<String> s2 = ['a', 'b', 'c'];\n\n  \/\/ identical() \u51fd\u6570\u7528\u6765\u68c0\u67e5\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u6307\u5411\u540c\u4e00\u4e2a\u5185\u5b58\u5730\u5740\u3002\n  \/\/ \u6253\u5370\u7684\u7ed3\u679c\u662f true\uff0c\n  \/\/ \u8bc1\u660e s1 \u548c s2 \u6307\u5411\u540c\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff0cs1 \u548c s2 \u5171\u75281\u4e2a ['a', 'b', 'c'] \u5b58\u50a8\u7a7a\u95f4\uff0c\n  \/\/ \u5373 \u201cconst \u5b9a\u4e49\u7684\u5e38\u91cf\u503c\u5728\u5185\u5b58\u4e2d\u4f1a\u88ab\u590d\u7528\u201d\n  print(identical(s1, s2));\n}<\/code><\/pre>\n
    \u5982\u679c\u628a\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u7684 const<\/code> \u66ff\u6362\u6210 final<\/code>\uff0c\u518d\u6b21\u8c03\u7528 identical(\u5bf9\u8c611, \u5bf9\u8c612)<\/code> \u51fd\u6570\uff0c\u53d1\u73b0\u6253\u5370\u7684\u503c\u53d8\u6210\u4e86 false\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    void main(List<String> args) {\n  \/\/ \u4f7f\u7528 final \u5b9a\u4e49\u4e24\u4e2a\u5e38\u91cf s1 \u548c s2\uff0c\u5206\u522b\u6307\u5411\u201c\u81ea\u5df1\u7684\u201d\u5b57\u9762\u91cf\u6570\u7ec4\n  final List<String> s1 = ['a', 'b', 'c'];\n  final List<String> s2 = ['a', 'b', 'c'];\n\n  \/\/ identical() \u51fd\u6570\u7528\u6765\u68c0\u67e5\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u6307\u5411\u540c\u4e00\u4e2a\u5185\u5b58\u5730\u5740\u3002\n  \/\/ \u6253\u5370\u7684\u7ed3\u679c\u662f false\uff0c\n  \/\/ \u8bc1\u660e s1 \u548c s2 \u6307\u5411\u4e0d\u540c\u7684\u5185\u5b58\u5730\u5740\uff0c\u5728\u5185\u5b58\u4e2d\u5206\u522b\u4e3a s1 \u548c s2 \u5f00\u8f9f\u4e86\u81ea\u5df1\u7684 ['a', 'b', 'c'] \u5b58\u50a8\u7a7a\u95f4\uff0c\n  \/\/ \u5373 \u201cfinal \u5b9a\u4e49\u7684\u5e38\u91cf\u54ea\u6015\u503c\u76f8\u540c\uff0c\u5728\u5185\u5b58\u4e2d\u4e5f\u4f1a\u88ab\u91cd\u590d\u5b9a\u4e49\u201d\n  print(identical(s1, s2));\n}<\/code><\/pre>\n
    2.3 \u533a\u522b 3<\/h3>\n
    \n
    \u975e final\uff0c\u975e const \u7684\u53d8\u91cf\u662f\u53ef\u4ee5\u88ab\u4fee\u6539\u7684\uff0c\u5373\u4f7f\u8fd9\u4e9b\u53d8\u91cf\u66fe\u7ecf\u5f15\u7528\u8fc7 const \u503c\u3002<\/p>\n<\/blockquote>\n
    \u53d8\u91cf\u7684\u672c\u8d28\u662f\u201c\u6570\u636e\u53ef\u53d8\u6027\u201d\u3002\u5982\u679c\u53d8\u91cf\u66fe\u7ecf\u5f15\u7528\u8fc7\u5176\u5b83\u5e38\u91cf\u7684\u503c\uff0c\u4e5f\u4e0d\u4f1a\u5f71\u54cd\u6211\u4eec\u540e\u7eed\u4fee\u6539\u8fd9\u4e2a\u53d8\u91cf\u7684\u503c\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    void main(List<String> args) {\n  \/\/ 1. \u5b9a\u4e49 const \u5e38\u91cf name \u5e76\u8d4b\u521d\u503c\n  const name = 'liulongbin';\n  \/\/ 2. \u628a\u5e38\u91cf name \u7684\u503c\u8d4b\u503c\u7ed9\u53d8\u91cf username\n  \/\/  \u2605\u53d8\u91cf username \u5f15\u7528\u4e86\u5e38\u91cf name \u7684\u503c\n  var username = name;\n  \/\/ 3. \u8f93\u51fa username \u7684\u503c\u662f\u5b57\u7b26\u4e32 liulongbin\n  print(username);\n\n  \/\/ 4. \u628a\u53d8\u91cf username \u7684\u503c\u53d8\u66f4\u4e3a\u5b57\u7b26\u4e32 escook\n  \/\/  \u2605\u867d\u7136\u53d8\u91cf username \u66fe\u7ecf\u5f15\u7528\u8fc7\u5e38\u91cf name \u7684\u503c\uff0c\n  \/\/  \u2605\u4f46\u662f\uff0c\u8fd9\u4e0d\u4f1a\u5f71\u54cd\u6211\u4eec\u4e3a username \u91cd\u65b0\u8d4b\u503c\uff0c\u56e0\u4e3a username \u672c\u8d28\u4e0a\u662f\u201c\u53d8\u91cf\u201d\n  username = 'escook';\n  \/\/ 5. \u518d\u6b21\u8f93\u51fa username \u7684\u503c\uff0c\u662f\u5b57\u7b26\u4e32 escook\n  print(username);\n}<\/code><\/pre>\n
    3. \u603b\u7ed3<\/h2>\n
      \n
    1. const \u548c final \u90fd\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u90a3\u4e9b\u4e0d\u5141\u8bb8\u88ab\u4fee\u6539<\/strong>\u7684\u53d8\u91cf\u503c\u3002\u5982\u679c\u521d\u59cb\u503c\u662f\u5b57\u9762\u91cf\uff0c\u90a3\u4e48\u540e\u7eed\u4e0d\u80fd\u4fee\u6539\u5b83\u4eec\u7684\u503c\u3002<\/li>\n
    2. \u5982\u679c\u5e38\u91cf\u7684\u503c\u662f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210<\/strong>\u7684\uff0c\u5219\u53ea\u80fd\u4f7f\u7528 final<\/strong> \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u5e38\u91cf\u3002<\/li>\n
    3. const<\/strong> \u5b9a\u4e49\u7684\u5e38\u91cf\u503c\u5728\u5185\u5b58\u4e2d\u4f1a\u88ab\u590d\u7528<\/strong>\uff0c\u800c final<\/strong> \u5b9a\u4e49\u7684\u5e38\u91cf\u503c\u54ea\u6015\u770b\u4e0a\u53bb\u4e00\u6837\uff0c\u5728\u5185\u5b58\u4e2d\u4e5f\u4f1a\u5f00\u8f9f\u4e0d\u540c\u7684\u7a7a\u95f4<\/strong>\u8fdb\u884c\u5b58\u50a8\u3002<\/li>\n
    4. \u53d8\u91cf\u54ea\u6015\u66fe\u7ecf\u5f15\u7528\u8fc7\u5e38\u91cf\u7684\u503c\uff0c\u4e5f\u4e0d\u5f71\u54cd\u6211\u4eec\u540e\u7eed\u7ed9\u8fd9\u4e2a\u53d8\u91cf\u8d4b\u65b0\u503c\u3002<\/li>\n<\/ol>\n
      \n
      \u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe<\/strong> \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
      \u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01 1. final \u548c const \u7684\u5171\u540c\u70b9 \u65e0\u8bba\u662f final \u8fd8\u662f const\uff0c\u90fd\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u90a3\u4e9b\u4e0d\u5141\u8bb8\u88ab\u4fee\u6539\u7684\u53d8\u91cf\u503c\u3002\u8fd9\u4e00\u7279\u70b9\u548c\u5176\u5b83\u8bed\u8a00\u4e2d\u7684\u201c\u5e38\u91cf\u201d\u7c7b\u4f3c\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a void main(List<String> args) { \/\/ 1. \u4f7f\u7528 final \u5b9a\u4e49\u5e38\u91cf name \u5e76\u8d4b\u503c final String name = 'zs'; print(name); \/\/ 2. \u4f7f\u7528 const \u5b9a\u4e49\u5e38\u91cf nickname \u5e76\u8d4b\u503c const String nickname = 'ls'; print(nickname); \/\/ 3. \u65e0\u8bba name \u8fd8\u662f nickname \u90fd\u65e0\u6cd5\u4f7f\u7528 = \u91cd\u65b0\u8d4b\u503c\uff0c \/\/ \u6240\u4ee5\u4e0b\u9762\u7684\u4e24\u884c\u4ee3\u7801\u4f1a\u7f16\u8bd1\u5931\u8d25 name = 'liulongbin'; nickname = 'escook'; } \u56e0\u6b64\uff0c\u6211\u4eec\u4eca\u540e\u5982\u679c\u60f3\u5b9a\u4e49\u5e38\u91cf\u5e76\u7acb\u5373\u8d4b\u521d\u503c\uff08\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u521d\u503c\u7279\u6307\u660e\u786e\u7684\u5b57\u9762\u91cf\u503c\uff09\uff0c\u65e0\u8bba\u4f7f\u7528 final \u8fd8\u662f const \u90fd\u53ef\u4ee5\u3002 2. final \u548c const \u7684\u533a\u522b \u6b63\u6240\u8c13\u5b58\u5728\u5373\u5408\u7406\uff0cdart \u65e2\u7136\u63d0\u4f9b\u4e86 final \u548c const \u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\uff0c\u90a3\u4e48\u5b83\u4eec\u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\u80af\u5b9a\u5b58\u5728\u5dee\u522b\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5e76\u638c\u63e1\u4ee5\u4e0b 3 \u70b9\u533a\u522b\u3002 2.1 \u533a\u522b 1 const \u8868\u793a\u7f16\u8bd1\u65f6\u5fc5\u987b\u7ed9\u51fa\u786e\u5207\u7684\u6700\u7ec8\u503c\uff0cfinal \u8868\u793a\u8fd0\u884c\u65f6\u53ef\u4ee5\u52a8\u6001\u751f\u6210\u4e00\u4e2a\u6700\u7ec8\u7684\u503c\u3002 \u7b2c\u4e00\u4e2a\u533a\u522b\u662f\u6700\u91cd\u8981\u7684\u3002\u638c\u63e1\u7b2c\u4e00\u4e2a\u533a\u522b\u7684\u5173\u952e\u662f\u80fd\u5426\u6b63\u786e\u533a\u5206\u4ec0\u4e48\u53eb\u201c\u786e\u5207\u7684\u6700\u7ec8\u503c\u201d\uff0c\u4ec0\u4e48\u53eb\u201c\u52a8\u6001\u751f\u6210\u6700\u7ec8\u503c\u201d\u3002 \u786e\u5207\u7684\u6700\u7ec8\u503c\uff1a\u5373\u5b57\u9762\u91cf\u503c\uff0c\u4f8b\u5982\u6570\u5b57 1\uff0c\u5b57\u7b26\u4e32 'abc'\uff0c\u5e03\u5c14\u503c true\uff0c\u5bf9\u8c61\u3001\u6570\u7ec4\u7b49\u90fd\u662f\u660e\u786e\u7684\u503c\u3002 \u52a8\u6001\u751f\u6210\u6700\u7ec8\u503c\uff1a\u5373\u503c\u662f\u52a8\u6001\u751f\u6210\u7684\uff0c\u4f8b\u5982\u968f\u673a\u6570\u3001\u52a8\u6001\u83b7\u53d6\u7cfb\u7edf\u7684\u65f6\u95f4\u7b49\u3002 \u4f8b\u5982\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u52a8\u6001\u751f\u6210\u4e86 10 \u4ee5\u5185\u7684\u968f\u673a\u6574\u6570\uff0c\u5e76\u628a\u968f\u673a\u751f\u6210\u7684\u6574\u6570\u8d4b\u503c\u7ed9\u5e38\u91cf age\uff0c\u6b64\u65f6\u5b9a\u4e49\u5e38\u91cf age \u65f6\u4e0d\u80fd\u4f7f\u7528 const\uff0c\u53ea\u80fd\u4f7f\u7528 final\uff1a \/\/ \u5bfc\u5165 \u6838\u5fc3\u7c7b\u5e93 math import 'dart:math'; void main(List<String> args) { \/\/ \u8c03\u7528 Random() \u5f97\u5230\u4e00\u4e2a\u968f\u673a\u6570\u751f\u6210\u5668 \/\/ \u518d\u8c03\u7528\u968f\u673a\u6570\u751f\u6210\u5668\u7684 nextInt(n) \u51fd\u6570\uff0c\u751f\u6210 0-n \u4e4b\u95f4\u7684\u968f\u673a\u6574\u6570\uff08\u5305\u62ec0\uff0c\u4f46\u4e0d\u5305\u62ecn\uff09 \/\/ \u8fd9\u91cc\u4e0d\u80fd\u7528 const\uff0c\u53ea\u80fd\u7528 final\u3002\u56e0\u4e3a Random().nextInt(10) \u7684\u503c\u201c\u662f\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7684\u201d\uff01 final int age = Random().nextInt(10); print(age); } \u518d\u4f8b\u5982\uff0c\u628a\u5f53\u524d\u65f6\u95f4\u8d4b\u503c\u7ed9\u5e38\u91cf dt\uff0c\u5728\u5b9a\u4e49\u5e38\u91cf dt \u65f6\u4e0d\u80fd\u4f7f\u7528 const\uff0c\u53ea\u80fd\u7528 final\u3002\u56e0\u4e3a dt \u7684\u503c\u4e0d\u662f\u5199\u6b7b\u7684\u5b57\u9762\u91cf\u503c\uff0c\u800c\u662f\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7684\uff1a void main(List<String> args) { \/\/ \u8fd9\u91cc\u53ea\u80fd\u7528 final final DateTime dt = DateTime.now(); print(dt); } \u6700\u540e\uff0c\u8fd8\u6709\u4e00\u4e2a\u6ce8\u610f\u70b9\u9700\u8981\u7279\u522b\u63d0\u9192\u4e0b\uff1a\u5982\u679c\u6211\u4eec\u60f3\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u5e38\u91cf\uff0c\u968f\u540e\u518d\u7ed9\u8fd9\u4e2a\u5e38\u91cf\u8d4b\u503c\uff0c\u6b64\u65f6\u53ea\u80fd\u7528 final\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a void main(List<String> args) { \/\/ 1. \u4f7f\u7528 final \u5148\u5b9a\u4e49\u540d\u4e3a name \u7684\u7a7a\u767d\u5e38\u91cf final String name; \/\/ 2. \u5728\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u52a8\u6001\u628a\u5e38\u91cf name \u7684\u503c\u8d4b\u503c\u4e3a\u5b57\u7b26\u4e32 'liulongbin' name = 'liulongbin'; print(name); } 2.2 \u533a\u522b 2 const \u5b9a\u4e49\u7684\u5e38\u91cf\u503c\u5728\u5185\u5b58\u4e2d\u4f1a\u88ab\u590d\u7528\uff1bfinal \u5b9a\u4e49\u7684\u5e38\u91cf\u54ea\u6015\u503c\u76f8\u540c\uff0c\u5728\u5185\u5b58\u4e2d\u4e5f\u4f1a\u88ab\u91cd\u590d\u5b9a\u4e49\u3002 \u4f7f\u7528 const \u5b9a\u4e49\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u6570\u7ec4\uff0c\u5206\u522b\u662f s1 \u548c s2\u3002\u8c03\u7528 identical(\u5bf9\u8c611, \u5bf9\u8c612) \u51fd\u6570\u53ef\u4ee5\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u662f\u5426\u76f8\u540c\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a void main(List<String> args) { \/\/ \u4f7f\u7528 const \u5b9a\u4e49\u4e24\u4e2a\u5e38\u91cf s1 \u548c s2\uff0c\u5206\u522b\u6307\u5411\u201c\u81ea\u5df1\u7684\u201d\u5b57\u9762\u91cf\u6570\u7ec4 const List<String> s1 = ['a', 'b', 'c']; const List<String> s2 = ['a', 'b', 'c']; \/\/ identi…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[9],"class_list":["post-137","post","type-post","status-publish","format-standard","hentry","category-dart","tag-dart"],"_links":{"self":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/comments?post=137"}],"version-history":[{"count":3,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/137\/revisions"}],"predecessor-version":[{"id":582,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/137\/revisions\/582"}],"wp:attachment":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/media?parent=137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/categories?post=137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/tags?post=137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}