{"id":310097,"date":"2024-05-20T21:42:04","date_gmt":"2024-05-20T13:42:04","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/310097.html"},"modified":"2024-05-20T21:42:19","modified_gmt":"2024-05-20T13:42:19","slug":"java-%e4%b8%ad-define-%e6%80%8e%e4%b9%88%e5%ae%9a%e4%b9%89%e5%b8%b8%e9%87%8f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/310097.html","title":{"rendered":"java \u4e2d define \u600e\u4e48\u5b9a\u4e49\u5e38\u91cf"},"content":{"rendered":"

\"java<\/p>\n

\u5728Java\u4e2d\u5b9a\u4e49\u5e38\u91cf\u4e3b\u8981\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528final<\/code>\u5173\u952e\u5b57<\/strong>\u3001\u901a\u8fc7\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b<\/strong>\u3002\u5e38\u91cf\u662f\u5728\u7f16\u7a0b\u4e2d\u7528\u4e8e\u8868\u793a\u4e0d\u53ef\u6539\u53d8\u7684\u503c\u7684\u5b9e\u4f53\u3002\u5728Java\u4e2d\uff0c\u5e38\u91cf\u901a\u5e38\u4ee5\u5168\u90e8\u5927\u5199\u5b57\u6bcd\u8868\u793a\uff0c\u5355\u8bcd\u4e4b\u95f4\u7528\u4e0b\u5212\u7ebf\u5206\u9694\u3002\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u66f4\u6539\u7684\u53d8\u91cf\uff0c\u4e00\u65e6\u7ed9\u5b83\u8d4b\u4e86\u521d\u503c\u4e4b\u540e\uff0c\u5c31\u4e0d\u5141\u8bb8\u5bf9\u5176\u518d\u6b21\u8d4b\u503c\u3002\u800c\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b\u5219\u610f\u5473\u7740\u7c7b\u7684\u5b9e\u4f8b\u4e00\u65e6\u88ab\u521b\u5efa\uff0c\u5b83\u7684\u4efb\u4f55\u5c5e\u6027\u90fd\u4e0d\u80fd\u66f4\u6539\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u7c7b\u7684\u6240\u6709\u6210\u5458\u53d8\u91cf\u8bbe\u7f6e\u4e3afinal\u5e76\u4e14\u4e0d\u63d0\u4f9b\u4fee\u6539\u5b83\u4eec\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

\u73b0\u5728\uff0c\u6211\u4eec\u5c06\u91cd\u70b9\u5c55\u5f00\u63cf\u8ff0\u4f7f\u7528final<\/code>\u5173\u952e\u5b57<\/strong>\u6765\u5b9a\u4e49\u5e38\u91cf\u3002final<\/code>\u5173\u952e\u5b57\u53ef\u4ee5\u7528\u4e8e\u53d8\u91cf\u3001\u65b9\u6cd5\u548c\u7c7b\u3002\u5f53\u7528\u4e8e\u53d8\u91cf\u65f6\uff0c\u8fd9\u4e2a\u53d8\u91cf\u7684\u503c\u4e0d\u80fd\u53d1\u751f\u53d8\u5316\uff0c\u5373\u53d8\u4e3a\u5e38\u91cf\u3002\u58f0\u660e\u4e3afinal<\/code>\u7684\u53d8\u91cf\u5fc5\u987b\u5728\u5b9a\u4e49\u65f6\u6216\u8005\u5728\u6784\u9020\u51fd\u6570\u4e2d\u521d\u59cb\u5316\uff0c\u4e4b\u540e\u5c31\u4e0d\u80fd\u518d\u88ab\u8d4b\u503c\u3002\u4f8b\u5982\uff0cpublic static final String COMPANY_NAME = "Tech Corp";<\/code> \u8fd9\u6837\u58f0\u660e\u540e\uff0cCOMPANY_NAME<\/code>\u5c31\u4f5c\u4e3a\u4e00\u4e2a\u5e38\u91cf\uff0c\u5b83\u7684\u503c\u5728\u7a0b\u5e8f\u8fd0\u884c\u671f\u95f4\u4e0d\u53ef\u66f4\u6539\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528FINAL\u5173\u952e\u5b57<\/h2>\n<\/p>\n

\u5b9a\u4e49\u5e38\u91cf<\/h3>\n<\/p>\n

\u5728\u7c7b\u4e2d\u5b9a\u4e49\u5e38\u91cf\u6700\u5e38\u89c1\u7684\u65b9\u5f0f\u662f\u5c06\u53d8\u91cf\u58f0\u660e\u4e3apublic static final<\/code>\u3002public<\/code>\u8868\u793a\u8fd9\u4e2a\u5e38\u91cf\u53ef\u4ee5\u88ab\u4efb\u610f\u5916\u90e8\u7c7b\u8bbf\u95ee\uff0cstatic<\/code>\u610f\u5473\u7740\u4e0d\u9700\u8981\u5b9e\u4f8b\u5316\u5c31\u53ef\u4ee5\u8bbf\u95ee\uff0cfinal<\/code>\u5219\u4fdd\u8bc1\u4e86\u53d8\u91cf\u7684\u4e0d\u53ef\u53d8\u6027\u3002<\/p>\n<\/p>\n

public class Constants {<\/p>\n
    public static final String APPLICATION_NAME = "My Application";<\/p>\n
    public static final int VERSION_CODE = 1;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6700\u4f73\u5b9e\u8df5<\/h3>\n<\/p>\n
\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u5e38\u91cf\u65f6\u5e94\u5f53\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\uff0c\u4f8b\u5982\uff1a\u4fdd\u8bc1\u547d\u540d\u6e05\u6670\u3001\u6613\u61c2\u3001\u4e0e\u529f\u80fd\u76f8\u5173\uff0c\u8fd8\u8981\u6ce8\u610f\u907f\u514d\u56e0\u8fc7\u5ea6\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u800c\u5bfc\u81f4\u7684\u7075\u6d3b\u6027\u4e0b\u964d\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b<\/h2>\n<\/p>\n
\u7c7b\u7684\u5b9a\u4e49<\/h3>\n<\/p>\n
\u8981\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7c7b\uff0c\u9700\u8981\u786e\u4fdd\u7c7b\u7684\u6240\u6709\u6210\u5458\u53d8\u91cf\u90fd\u662ffinal<\/code>\u7684\uff0c\u7c7b\u672c\u8eab\u4e5f\u5fc5\u987b\u88ab\u58f0\u660e\u4e3afinal<\/code>\uff0c\u4ee5\u9632\u6b62\u5176\u4ed6\u7c7b\u7ee7\u627f\u5b83\u5e76\u6539\u53d8\u5b83\u7684\u5c5e\u6027\u3002<\/p>\n<\/p>\n
public final class ImmutableClass {<\/p>\n
    private final String propertyName;<\/p>\n
    public ImmutableClass(String propertyName) {<\/p>\n
        this.propertyName = propertyName;<\/p>\n
    }<\/p>\n
    public String getPropertyName() {<\/p>\n
        return propertyName;<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u4e0d\u53ef\u53d8\u7c7b<\/h3>\n<\/p>\n
\u4e0d\u53ef\u53d8\u7c7b\u4e00\u65e6\u88ab\u5b9e\u4f8b\u5316\uff0c\u5176\u5c5e\u6027\u5c31\u4e0d\u80fd\u88ab\u66f4\u6539\u3002\u8fd9\u6837\u7684\u7c7b\u53ef\u4ee5\u5b89\u5168\u5730\u88ab\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\uff0c\u65e0\u9700\u8003\u8651\u540c\u6b65\u95ee\u9898\uff0c\u662f\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u4e00\u79cd\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u679a\u4e3e\u7c7b\u578b<\/h2>\n<\/p>\n
\u7528\u4e8e\u5b9a\u4e49\u5e38\u91cf\u96c6<\/h3>\n<\/p>\n
\u679a\u4e3e\uff08enumeration\uff09\u7c7b\u578b\u4e5f\u662f\u5b9a\u4e49\u5e38\u91cf\u7684\u4e00\u79cd\u65b9\u6cd5\u3002\u679a\u4e3e\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u7c7b\u7c7b\u578b\uff0c\u53ef\u4ee5\u6709\u81ea\u5df1\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u3002\u6bcf\u4e00\u4e2a\u679a\u4e3e\u5143\u7d20\u90fd\u662f\u679a\u4e3e\u7c7b\u578b\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u4e14\u662fpublic static final<\/code>\u7684\u3002<\/p>\n<\/p>\n
public enum Direction {<\/p>\n
    NORTH, EAST, SOUTH, WEST;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u679a\u4e3e\u7684\u4f18\u52bf<\/h3>\n<\/p>\n
\u679a\u4e3e\u4e0d\u4ec5\u53ef\u4ee5\u627f\u8f7d\u6570\u636e\uff0c\u8fd8\u80fd\u63d0\u4f9b\u884c\u4e3a\u3002\u8fd9\u4f7f\u5f97\u679a\u4e3e\u8f83\u4e4b\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u5e38\u91cf\u66f4\u52a0\u7075\u6d3b\u548c\u5f3a\u5927\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u7c7b\u63a5\u53e3\u5b9a\u4e49\u5e38\u91cf<\/h2>\n<\/p>\n
\u5e38\u91cf\u63a5\u53e3\u6a21\u5f0f<\/h3>\n<\/p>\n
\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u5e38\u91cf\u662f\u4e00\u79cd\u8f83\u65e7\u7684\u5b9e\u8df5\u65b9\u5f0f\uff0c\u901a\u5e38\u4e0d\u63a8\u8350\u4f7f\u7528\u3002\u5728\u5386\u53f2\u4ee3\u7801\u4e2d\uff0c\u6709\u65f6\u4f1a\u770b\u5230\u8fd9\u6837\u7684\u63a5\u53e3\u53ea\u7528\u6765\u5b9a\u4e49\u5e38\u91cf\u3002<\/p>\n<\/p>\n
public interface ConstantInterface {<\/p>\n
    String ERROR_MESSAGE = "Error occurred";<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u6ce8\u610f<\/h3>\n<\/p>\n
\u4e0d\u8fc7\uff0c\u7531\u4e8e\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u4f1a\u7ee7\u627f\u8fd9\u4e9b\u5e38\u91cf\uff0c\u4f1a\u5bfc\u81f4\u63a5\u53e3\u548c\u5b9e\u73b0\u7c7b\u4e4b\u95f4\u7684\u4e0d\u5fc5\u8981\u7684\u8026\u5408\uff0c\u56e0\u6b64\u5f53\u524d\u4e3b\u6d41\u7684\u505a\u6cd5\u662f\u907f\u514d\u4f7f\u7528\u5e38\u91cf\u63a5\u53e3\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5e38\u91cf\u76f8\u5173\u8bbe\u8ba1\u6a21\u5f0f<\/h2>\n<\/p>\n
\u5355\u4f8b\u6a21\u5f0f<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u6574\u4e2a\u5e94\u7528\u53ea\u9700\u8981\u4e00\u4e2a\u4e0d\u53d8\u7684\u5b9e\u4f8b\u65f6\uff0c\u5982\u914d\u7f6e\u6587\u4ef6\uff0c\u53ef\u4f7f\u7528\u5355\u4f8b\uff08Singleton\uff09\u6a21\u5f0f\u6765\u4fdd\u8bc1\u53ea\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u4e14\u8fd9\u4e2a\u5b9e\u4f8b\u5728\u5168\u5c40\u53ef\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6a21\u5f0f<\/h3>\n<\/p>\n
\u901a\u8fc7\u521b\u5efa\u5bf9\u8c61\u7684\u4e0d\u53ef\u53d8\u526f\u672c\uff0c\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b89\u5168\u6027\uff0c\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6a21\u5f0f\u901a\u5e38\u548c\u4e0d\u53ef\u53d8\u7c7b\u7ed3\u5408\u4f7f\u7528\uff0c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
\u516d\u3001\u603b\u7ed3<\/h2>\n<\/p>\n
\u786e\u4fdd\u4ee3\u7801\u7684\u6e05\u6670\u6027\u548c\u7a33\u5b9a\u6027<\/strong>\u662f\u4f7f\u7528\u5e38\u91cf\u7684\u4e3b\u8981\u76ee\u7684\u3002\u5728Java\u4e2d\uff0c\u63a8\u8350\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u6216\u8005\u679a\u4e3e\u7c7b\u578b\u6765\u5b9a\u4e49\u5e38\u91cf\uff0c\u800c\u4e0d\u53ef\u53d8\u7c7b\u5219\u7528\u4e8e\u521b\u5efa\u5176\u5b9e\u4f8b\u4e0d\u53ef\u53d8\u7684\u5bf9\u8c61\u3002\u9075\u5faa\u826f\u597d\u7684\u7f16\u7801\u5b9e\u8df5\uff0c\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u5065\u58ee\u3001\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
Q\uff1a\u5728Java\u4e2d\uff0c\u5982\u4f55\u5b9a\u4e49\u5e38\u91cf\uff1f<\/strong>
\nA\uff1a\u5728Java\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5173\u952e\u5b57final<\/code>\u6765\u5b9a\u4e49\u5e38\u91cf\u3002\u5e38\u91cf\u662f\u4e00\u79cd\u4e0d\u80fd\u88ab\u6539\u53d8\u7684\u503c\uff0c\u4e00\u65e6\u88ab\u5b9a\u4e49\uff0c\u5176\u503c\u5c06\u4fdd\u6301\u4e0d\u53d8\u3002\u6211\u4eec\u53ef\u4ee5\u5c06final<\/code>\u5173\u952e\u5b57\u4e0e\u6570\u636e\u7c7b\u578b\u548c\u53d8\u91cf\u540d\u79f0\u4e00\u8d77\u4f7f\u7528\uff0c\u6765\u521b\u5efa\u4e00\u4e2a\u5e38\u91cf\u3002<\/p>\n
Q\uff1a\u5982\u4f55\u5728Java\u4e2d\u58f0\u660e\u4e00\u4e2a\u5e38\u91cf\uff1f<\/strong>
\nA\uff1a\u8981\u5728Java\u4e2d\u58f0\u660e\u4e00\u4e2a\u5e38\u91cf\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5c06\u4e00\u4e2a\u6574\u6570\u5e38\u91cf\u58f0\u660e\u4e3afinal int MAX_VALUE = 100;<\/code>\u3002\u8fd9\u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aMAX_VALUE<\/code>\u7684\u5e38\u91cf\uff0c\u5176\u503c\u4e3a100\uff0c\u5e76\u4e14\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/p>\n
Q\uff1a\u5e38\u91cf\u548c\u53d8\u91cf\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
\nA\uff1a\u5e38\u91cf\u548c\u53d8\u91cf\u5728Java\u4e2d\u6709\u4e00\u4e9b\u91cd\u8981\u7684\u533a\u522b\u3002\u9996\u5148\uff0c\u5e38\u91cf\u7684\u503c\u5728\u58f0\u660e\u540e\u4e0d\u80fd\u88ab\u4fee\u6539\uff0c\u800c\u53d8\u91cf\u7684\u503c\u53ef\u4ee5\u968f\u65f6\u6539\u53d8\u3002\u5176\u6b21\uff0c\u5e38\u91cf\u901a\u5e38\u7528\u5927\u5199\u5b57\u6bcd\u8868\u793a\uff0c\u4fbf\u4e8e\u533a\u5206\u3002\u6700\u540e\uff0c\u5e38\u91cf\u5728\u7a0b\u5e8f\u4e2d\u53ef\u4ee5\u63d0\u4f9b\u56fa\u5b9a\u7684\u6570\u503c\u6216\u8005\u5176\u4ed6\u5e38\u91cf\uff0c\u800c\u53d8\u91cf\u53ef\u4ee5\u6839\u636e\u9700\u8981\u5b58\u50a8\u4e0d\u540c\u7684\u503c\u3002\u5728\u58f0\u660e\u5e38\u91cf\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528final<\/code>\u5173\u952e\u5b57\u6765\u4f7f\u5176\u4e0d\u53ef\u53d8\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Java\u4e2d\u5b9a\u4e49\u5e38\u91cf\u4e3b\u8981\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528final\u5173\u952e\u5b57\u3001\u901a\u8fc7\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b\u3002\u5e38\u91cf\u662f\u5728\u7f16\u7a0b\u4e2d\u7528\u4e8e\u8868\u793a\u4e0d\u53ef\u6539\u53d8\u7684\u503c […]","protected":false},"author":3,"featured_media":310120,"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\/310097"}],"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=310097"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/310097\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/310120"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=310097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=310097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=310097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}