{"id":275557,"date":"2024-05-16T14:30:36","date_gmt":"2024-05-16T06:30:36","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/275557.html"},"modified":"2024-05-16T14:30:44","modified_gmt":"2024-05-16T06:30:44","slug":"java-%e9%a1%b9%e7%9b%ae%e4%bb%a3%e7%a0%81%e4%b8%ad%e7%9a%84-import-%e8%af%ad%e5%8f%a5%e6%80%8e%e4%b9%88%e4%bd%bf%e7%94%a8-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/275557.html","title":{"rendered":"java \u9879\u76ee\u4ee3\u7801\u4e2d\u7684 import \u8bed\u53e5\u600e\u4e48\u4f7f\u7528"},"content":{"rendered":"

\"java<\/p>\n

Java \u9879\u76ee\u4ee3\u7801\u4e2d\u7684 import \u8bed\u53e5\u4e3b\u8981\u7528\u4e8e\u5f15\u5165\u5176\u4ed6\u5305\u4e2d\u7684\u7c7b\u3001\u63a5\u53e3\u6216\u5176\u4ed6\u6210\u5458\u3001\u7b80\u5316\u7c7b\u540d\u7684\u4f7f\u7528<\/strong>\uff0c\u5141\u8bb8\u6211\u4eec\u76f4\u63a5\u901a\u8fc7\u7b80\u5355\u7684\u540d\u79f0\u5f15\u7528\uff0c\u7701\u53bb\u4e86\u7f16\u5199\u5b8c\u6574\u8def\u5f84\u7684\u9ebb\u70e6\u3002import\u8bed\u53e5\u4f4d\u4e8epackage\u8bed\u53e5\u4e4b\u540e\u3001\u7c7b\u5b9a\u4e49\u4e4b\u524d\u3002\u5177\u4f53\u4f7f\u7528\u65f6\uff0c\u53ef\u4ee5\u6309\u9700\u5bfc\u5165\u5355\u4e2a\u7c7b\u3001\u6216\u8005\u5bfc\u5165\u6574\u4e2a\u5305\u4e0b\u7684\u6240\u6709\u7c7b\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 import java.util.List;<\/code> \u5c06\u53ea\u5bfc\u5165List\u63a5\u53e3\uff0c\u800c\u4f7f\u7528 import java.util.*;<\/code> \u5c06\u5bfc\u5165java.util\u5305\u4e2d\u7684\u6240\u6709\u7c7b\u548c\u63a5\u53e3\u3002\u5355\u4e2a\u7c7b\u5bfc\u5165\u662f\u6700\u4f73\u5b9e\u8df5\u4e4b\u4e00<\/strong>\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u51cf\u5c11\u547d\u540d\u51b2\u7a81\u7684\u98ce\u9669\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002\u8be6\u7ec6\u5730\u8bf4\uff0c\u4f7f\u7528\u5355\u4e2a\u7c7b\u5bfc\u5165\u53ef\u4ee5\u6e05\u6670\u5730\u663e\u793a\u4ee3\u7801\u4e2d\u4f7f\u7528\u4e86\u54ea\u4e9b\u5916\u90e8\u7c7b\uff0c\u8fd9\u5bf9\u7ef4\u62a4\u5927\u578b\u9879\u76ee\u6765\u8bf4\u662f\u975e\u5e38\u6709\u5e2e\u52a9\u7684\u3002<\/p>\n<\/p>\n

\u4e00\u3001IMPORT \u8bed\u53e5\u7684\u57fa\u672c\u4f5c\u7528<\/h3>\n<\/p>\n

\u5728Java\u7f16\u7a0b\u4e2d\uff0cimport\u8bed\u53e5\u7684\u51fa\u73b0\u6781\u5927\u5730\u7b80\u5316\u4e86\u4ee3\u7801\u7684\u590d\u6742\u6027\u3002\u5f00\u53d1\u8005\u65e0\u9700\u6bcf\u6b21\u90fd\u4e66\u5199\u957f\u4e32\u7684\u5305\u540d\uff0c\u901a\u8fc7\u4f7f\u7528import\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bbf\u95ee\u5176\u4ed6\u5305\u4e2d\u7684\u7c7b\u6216\u63a5\u53e3\u3002\u5728\u5177\u4f53\u7f16\u7a0b\u65f6\uff0cimport\u8bed\u53e5\u8d77\u5230\u4e86\u6865\u6881\u7684\u4f5c\u7528\uff0c\u5b83\u544a\u8bc9Java\u7f16\u8bd1\u5668\u53bb\u54ea\u91cc\u67e5\u627e\u7528\u6237\u8981\u4f7f\u7528\u7684\u7c7b\u3002\u8fd9\u4e0d\u4ec5\u63d0\u5347\u4e86\u5f00\u53d1\u6548\u7387\uff0c\u8fd8\u8ba9\u4ee3\u7801\u53d8\u5f97\u66f4\u52a0\u6e05\u6670\u3001\u6613\u4e8e\u7406\u89e3\u3002<\/p>\n<\/p>\n

\u4e8c\u3001IMPORT \u8bed\u53e5\u7684\u4f7f\u7528\u89c4\u8303<\/h3>\n<\/p>\n

A\u3001\u5355\u4e2a\u7c7b\u5bfc\u5165<\/h4>\n<\/p>\n

\u5f53\u53ea\u9700\u8981\u67d0\u4e2a\u7279\u5b9a\u7684\u7c7b\u6216\u8005\u63a5\u53e3\u65f6\uff0c\u63a8\u8350\u4f7f\u7528\u5355\u4e2a\u7c7b\u5bfc\u5165\u3002\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u660e\u786e\u5730\u6307\u51fa\u4ee3\u7801\u4e2d\u9700\u8981\u54ea\u4e9b\u5916\u90e8\u7684\u7c7b\u6216\u63a5\u53e3\uff0c\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u53ca\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n

import java.util.ArrayList;<\/p>\n
<\/code><\/pre>\n<\/p>\n
B\u3001\u540c\u4e00\u5305\u5185\u591a\u4e2a\u7c7b\u5bfc\u5165<\/h4>\n<\/p>\n
\u5f53\u9700\u8981\u4f7f\u7528\u540c\u4e00\u5305\u4e2d\u7684\u591a\u4e2a\u7c7b\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u661f\u53f7\uff08*\uff09\u6765\u5b9e\u73b0\u6279\u91cf\u5bfc\u5165\u3002\u7136\u800c\uff0c\u8fd9\u79cd\u505a\u6cd5\u5e76\u4e0d\u63a8\u8350\uff0c\u56e0\u4e3a\u5b83\u53ef\u80fd\u4f1a\u5bfc\u5165\u4e0d\u5fc5\u8981\u7684\u7c7b\uff0c\u4f7f\u7f16\u8bd1\u901f\u5ea6\u7565\u5fae\u964d\u4f4e\uff0c\u4e5f\u53ef\u80fd\u5f15\u53d1\u547d\u540d\u51b2\u7a81\u3002<\/p>\n<\/p>\n
import java.util.*;<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001IMPORT \u548c\u5305\u7684\u5173\u7cfb<\/h3>\n<\/p>\n
import\u8bed\u53e5\u4e0eJava\u7684\u5305(package)\u673a\u5236\u7d27\u5bc6\u76f8\u5173\u3002\u5305\u7528\u4e8e\u7ec4\u7ec7\u7c7b\u548c\u63a5\u53e3\uff0c\u4ee5\u907f\u514d\u547d\u540d\u51b2\u7a81\u3002\u5f53\u5bfc\u5165\u4e0d\u540c\u5305\u4e2d\u7684\u7c7b\u65f6\uff0cimport\u7684\u4f5c\u7528\u5c31\u51f8\u663e\u51fa\u6765\u4e86\u3002\u5b83\u80fd\u544a\u8bc9\u7f16\u8bd1\u5668\u6240\u9700\u7c7b\u7684\u786e\u5207\u4f4d\u7f6e\uff0c\u4ece\u800c\u6b63\u786e\u7f16\u8bd1\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u56db\u3001\u9759\u6001 IMPORT \u7684\u4f7f\u7528<\/h3>\n<\/p>\n
Java 5 \u5f15\u5165\u4e86\u9759\u6001\u5bfc\u5165\uff08static import\uff09\uff0c\u5b83\u53ef\u4ee5\u5bfc\u5165\u7c7b\u7684\u9759\u6001\u516c\u5171\u6210\u5458\uff08\u5982\u53d8\u91cf\u548c\u65b9\u6cd5\uff09\uff0c\u800c\u65e0\u9700\u6bcf\u6b21\u90fd\u6307\u5b9a\u7c7b\u540d\u3002<\/p>\n<\/p>\n
import static java.lang.Math.*;<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u9759\u6001\u5bfc\u5165\u540e\uff0c\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528Math\u7c7b\u4e2d\u7684\u9759\u6001\u65b9\u6cd5\uff0c\u5982 sqrt(double)<\/code>\uff0c\u800c\u65e0\u9700\u4e66\u5199 Math.sqrt(double)<\/code>\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5bfc\u5165\u7c7b\u7684\u6700\u4f73\u5b9e\u8df5<\/h3>\n<\/p>\n
\u5728\u7f16\u7801\u65f6\uff0c\u8981\u9075\u5b88\u4e00\u5b9a\u7684\u6700\u4f73\u5b9e\u8df5\u539f\u5219\uff0c\u4ee5\u4fdd\u6301\u4ee3\u7801\u7684\u6e05\u6670\u548c\u9ad8\u6548\uff1a<\/p>\n<\/p>\n
    \n
  • \u5c3d\u53ef\u80fd\u4f7f\u7528\u5355\u4e2a\u7c7b\u5bfc\u5165\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u661f\u53f7(*)\u5bfc\u5165\u3002<\/li>\n
  • \u4fdd\u6301import\u8bed\u53e5\u7684\u987a\u5e8f\u548c\u7ec4\u7ec7\uff0c\u5982\u5c06\u6807\u51c6Java\u5e93\u3001\u7b2c\u4e09\u65b9\u5e93\u548c\u81ea\u5df1\u7684\u5305\u5206\u5f00\u5217\u51fa\u3002<\/li>\n
  • \u4f7f\u7528IDE\u7684\u7ec4\u7ec7import\u529f\u80fd\uff0c\u4ee5\u79fb\u9664\u672a\u4f7f\u7528\u7684import\u8bed\u53e5\uff0c\u9632\u6b62\u7c7b\u51b2\u7a81\u548c\u51cf\u5c11\u7f16\u8bd1\u8d1f\u62c5\u3002<\/li>\n<\/ul>\n
    \u7ecf\u8fc7\u7cbe\u5fc3\u7684\u7ba1\u7406\u548c\u7ec4\u7ec7\uff0cimport\u8bed\u53e5\u80fd\u591f\u63d0\u9ad8Java\u9879\u76ee\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u9002\u5f53\u4f7f\u7528import\u8bed\u53e5\u4e0d\u4ec5\u80fd\u591f\u63d0\u5347\u5f00\u53d1\u6548\u7387\uff0c\u8fd8\u80fd\u907f\u514d\u6f5c\u5728\u7684\u9519\u8bef\uff0c\u662fJava\u7f16\u7a0b\u4e2d\u4e00\u4e2a\u4e0d\u53ef\u5ffd\u89c6\u7684\u8981\u7d20\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
    1. \u5728 Java \u9879\u76ee\u4ee3\u7801\u4e2d\uff0cimport \u8bed\u53e5\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n
    import \u8bed\u53e5\u7528\u4e8e\u5bfc\u5165\u5176\u4ed6\u7c7b\u7684\u5b9a\u4e49\uff0c\u4ee5\u4fbf\u5728\u5f53\u524d\u4ee3\u7801\u6587\u4ef6\u4e2d\u53ef\u4ee5\u76f4\u63a5\u5f15\u7528\u8fd9\u4e9b\u7c7b\uff0c\u800c\u4e0d\u9700\u8981\u5199\u51fa\u5b8c\u6574\u7684\u5305\u540d\u8def\u5f84\u3002\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8282\u7701\u4ee3\u7801\u91cf\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n
    2. \u5728 Java \u9879\u76ee\u4ee3\u7801\u4e2d\uff0c\u5982\u4f55\u6b63\u786e\u4f7f\u7528 import \u8bed\u53e5\uff1f<\/strong><\/p>\n
    \u8981\u6b63\u786e\u4f7f\u7528 import \u8bed\u53e5\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3\u88ab\u5bfc\u5165\u7c7b\u7684\u5b8c\u6574\u5305\u540d\u8def\u5f84\u3002\u7136\u540e\uff0c\u5728\u9700\u8981\u4f7f\u7528\u8be5\u7c7b\u7684\u5730\u65b9\uff0c\u4f7f\u7528import\u8bed\u53e5\u5bfc\u5165\u8be5\u7c7b\u5373\u53ef\u3002\u4f8b\u5982\uff0c\u5982\u679c\u9700\u8981\u4f7f\u7528java.util\u5305\u4e0b\u7684ArrayList\u7c7b\uff0c\u53ef\u4ee5\u5728\u4ee3\u7801\u6587\u4ef6\u7684\u5f00\u5934\u4f7f\u7528 import java.util.ArrayList; \u8fd9\u6837\u5c31\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 ArrayList \u800c\u4e0d\u9700\u8981\u5199\u51fa\u5b8c\u6574\u7684\u5305\u540d\u8def\u5f84\u3002<\/p>\n
    \u540c\u65f6\uff0c\u5982\u679c\u591a\u4e2a\u7c7b\u4f4d\u4e8e\u540c\u4e00\u4e2a\u5305\u4e0b\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26\u5bfc\u5165\u6574\u4e2a\u5305\uff0c\u4f8b\u5982 import java.util.<\/em>; \u8fd9\u6837\u5c31\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 java.util \u5305\u4e0b\u7684\u6240\u6709\u7c7b\u3002<\/p>\n
    3. \u5728 Java \u9879\u76ee\u4ee3\u7801\u4e2d\u4f7f\u7528 import \u8bed\u53e5\u65f6\u6709\u54ea\u4e9b\u6ce8\u610f\u4e8b\u9879\uff1f<\/strong><\/p>\n
    \u5728\u4f7f\u7528 import \u8bed\u53e5\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n
      \n
    • \u4e0d\u8981\u5bfc\u5165\u4e0d\u9700\u8981\u7684\u7c7b\uff0c\u907f\u514d\u5bfc\u5165\u8fc7\u591a\u65e0\u7528\u7684\u7c7b\uff0c\u589e\u52a0\u4ee3\u7801\u7684\u590d\u6742\u6027\u548c\u6df7\u4e71\u5ea6\u3002<\/li>\n
    • \u5f53\u5bfc\u5165\u7684\u7c7b\u5b58\u5728\u547d\u540d\u51b2\u7a81\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b8c\u6574\u7684\u5305\u540d\u8def\u5f84\u6765\u5f15\u7528\u9700\u8981\u4f7f\u7528\u7684\u7c7b\uff0c\u907f\u514d\u51b2\u7a81\u3002<\/li>\n
    • \u5728\u4e0d\u540c\u7684\u4ee3\u7801\u6587\u4ef6\u4e2d\uff0c\u5982\u679c\u9700\u8981\u4f7f\u7528\u76f8\u540c\u7684\u7c7b\uff0c\u53ef\u4ee5\u5728\u6bcf\u4e2a\u6587\u4ef6\u4e2d\u90fd\u4f7f\u7528 import \u8bed\u53e5\u5bfc\u5165\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5b8c\u6574\u7684\u5305\u540d\u8def\u5f84\u6765\u5f15\u7528\uff0c\u6839\u636e\u5177\u4f53\u60c5\u51b5\u9009\u62e9\u66f4\u597d\u7684\u65b9\u5f0f\u3002<\/li>\n
    • \u5982\u679c\u5bfc\u5165\u7684\u7c7b\u4f4d\u4e8e\u5176\u4ed6\u5305\u4e2d\uff0c\u9700\u8981\u786e\u4fdd\u8be5\u7c7b\u6240\u5728\u7684\u5305\u662f\u5728\u7f16\u8bd1\u8def\u5f84\u4e0b\uff0c\u5426\u5219\u4f1a\u51fa\u73b0\u65e0\u6cd5\u627e\u5230\u7c7b\u7684\u7f16\u8bd1\u9519\u8bef\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"Java \u9879\u76ee\u4ee3\u7801\u4e2d\u7684 import \u8bed\u53e5\u4e3b\u8981\u7528\u4e8e\u5f15\u5165\u5176\u4ed6\u5305\u4e2d\u7684\u7c7b\u3001\u63a5\u53e3\u6216\u5176\u4ed6\u6210\u5458\u3001\u7b80\u5316\u7c7b\u540d\u7684\u4f7f\u7528\uff0c\u5141\u8bb8\u6211\u4eec\u76f4 […]","protected":false},"author":3,"featured_media":275570,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/275557"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=275557"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/275557\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/275570"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=275557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=275557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=275557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}