{"id":203304,"date":"2025-05-22T09:52:51","date_gmt":"2025-05-22T01:52:51","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203304\/"},"modified":"2025-05-22T09:52:51","modified_gmt":"2025-05-22T01:52:51","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-java-%e4%b8%ad-a-x-%e4%bc%9a%e5%bc%95%e5%8f%91-int-%e8%bd%ac-char-%e6%8d%9f%e5%a4%b1%e7%b2%be%e5%ba%a6-%e9%94%99%e8%af%af%ef%bc%8c%e8%80%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203304\/","title":{"rendered":"\u4e3a\u4ec0\u4e48 Java \u4e2d \\” \\’a\\’ + x \\” \u4f1a\u5f15\u53d1 \\”int \u8f6c char \u635f\u5931\u7cbe\u5ea6\\” \u9519\u8bef\uff0c\u800c \\” \\’a\\’ + 1 \\” \u5374\u4e0d\u4f1a\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u4e3a\u4ec0\u4e48 Java \u4e2d \\” \\’a\\’ + x \\” \u4f1a\u5f15\u53d1 \\”int \u8f6c char \u635f\u5931\u7cbe\u5ea6\\” \u9519\u8bef\uff0c\u800c \\” \\’a\\’ + 1 \\” \u5374\u4e0d\u4f1a\uff1f <\/h1>\n

\u7f16\u7a0b\u5e76\u4e0d\u662f\u4e00\u4e2a\u673a\u68b0\u6027\u7684\u5de5\u4f5c\uff0c\u800c\u662f\u9700\u8981\u6709\u601d\u8003\uff0c\u6709\u521b\u65b0\u7684\u5de5\u4f5c\uff0c\u8bed\u6cd5\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u5219\u662f\u4f9d\u9760\u4eba\u7684\u601d\u7ef4\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u575a\u6301\u5b66\u4e60\u548c\u66f4\u65b0\u81ea\u5df1\u7684\u77e5\u8bc6\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300a\u4e3a\u4ec0\u4e48 Java \u4e2d \\” \\’a\\’ + x \\” \u4f1a\u5f15\u53d1 \\”int \u8f6c char \u635f\u5931\u7cbe\u5ea6\\” \u9519\u8bef\uff0c\u800c \\” \\’a\\’ + 1 \\” \u5374\u4e0d\u4f1a\uff1f \u300b\uff0c\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\uff0c\u5728\u8fd9\u53ef\u4ee5\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5f00\u53d1\u80fd\u529b\u7684\u63d0\u5347\u3002<\/p>\n

<\/p>\n

java \u4e2d char \u7c7b\u578b\u7684\u8ba1\u7b97\u6280\u5de7<\/strong><\/p>\n

\u5728 java \u4e2d\uff0cchar \u7c7b\u578b\u4ee3\u8868\u5355\u4e2a unicode \u5b57\u7b26\uff0c\u5b83\u7684\u503c\u8303\u56f4\u4e0e java \u6807\u51c6\u5e93\u4e2d\u5b9a\u4e49\u7684 char \u7c7b\u4e00\u81f4\u3002\u7136\u800c\uff0c\u5bf9\u4e8e char \u7c7b\u578b\u7684\u8ba1\u7b97\uff0c\u6709\u65f6\u9700\u8981\u7406\u89e3 java \u7684\u7c7b\u578b\u8f6c\u6362\u673a\u5236\u3002<\/p>\n

\u95ee\u9898\uff1a’a’ + x \u4e0e ‘a’ + 1<\/strong><\/p>\n

\u4ee5\u4e0b\u4ee3\u7801\u5f15\u53d1\u4e86\u521d\u5b66\u8005\u7684\u7591\u95ee\uff1a<\/p>\n

    int x = 1;\n    char c1 = 'a' + x;\n    char c2 = 'a'+ 1;<\/pre>\n
\u4e3a\u4ec0\u4e48 c1 \u4f1a\u5f15\u53d1\u201cint \u8f6c char \u635f\u5931\u7cbe\u5ea6\u201d\u7684\u9519\u8bef\uff0c\u800c c2 \u5374\u4e0d\u4f1a\uff1f<\/p>\n
\u7b54\u6848\uff1a\u5e38\u91cf\u8868\u8fbe\u5f0f<\/strong><\/p>\n
java \u8bed\u8a00\u89c4\u8303 (jls) \u4e2d\u7684 5.2 \u8282\u5b9a\u4e49\u4e86\u8d4b\u503c\u4e0a\u4e0b\u6587\u4e2d\u5141\u8bb8\u7684\u7c7b\u578b\u8f6c\u6362\uff0c\u5176\u4e2d\u5305\u62ec\u4e86 char \u7c7b\u578b\uff1a<\/p>\n
\n
\u5982\u679c\u8868\u8fbe\u5f0f\u662f byte\u3001short\u3001char \u6216 int \u7c7b\u578b\u7684\u5e38\u91cf\u8868\u8fbe\u5f0f\uff0c\u5219\uff1a<\/p>\n
    \n
  • \u5982\u679c\u53d8\u91cf\u662f byte\u3001short \u6216 char \u7c7b\u578b\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u7f29\u5c0f\u539f\u8bed\u8f6c\u6362\uff0c\u4e14\u5e38\u91cf\u8868\u8fbe\u5f0f\u7684\u503c\u53ef\u5728\u53d8\u91cf\u7c7b\u578b\u4e2d\u8868\u793a\u3002<\/li>\n<\/ul>\n<\/blockquote>\n
    \u5728 ‘a’ + 1 \u4e2d\uff0c\u8868\u8fbe\u5f0f\u662f\u4e00\u4e2a\u5e38\u91cf\uff0c\u5373\u4e00\u4e2a int \u503c\uff0c\u5e76\u4e14\u5b83\u7684\u503c\uff0898\uff09\u53ef\u4ee5\u5728 char \u7c7b\u578b\u4e2d\u8868\u793a\uff0c\u56e0\u6b64\u8fd9\u79cd\u8f6c\u6362\u662f\u5141\u8bb8\u7684\u3002<\/p>\n
    \u7136\u800c\uff0c’a’ + x \u4e0d\u662f\u4e00\u4e2a\u5e38\u91cf\u8868\u8fbe\u5f0f\uff0c\u56e0\u4e3a\u53d8\u91cf x \u662f\u4e00\u4e2a\u672a\u77e5\u7684 int \u503c\u3002\u7f16\u8bd1\u5668\u65e0\u6cd5\u786e\u5b9a\u8f6c\u6362\u662f\u5426\u4f1a\u9020\u6210\u7cbe\u5ea6\u635f\u5931\u3002\u56e0\u6b64\uff0c\u4e3a\u4e86\u9632\u6b62\u6f5c\u5728\u7684\u6570\u636e\u4e22\u5931\uff0c\u7f16\u8bd1\u5668\u7981\u6b62\u5c06\u975e\u5e38\u91cf\u8868\u8fbe\u5f0f\u7f29\u5c0f\u4e3a char \u7c7b\u578b\u3002<\/p>\n
    \u56e0\u6b64\uff0c\u5f53 ‘a’ + x \u8f6c\u6362\u4e3a char \u65f6\u4f1a\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\uff0c\u800c ‘a’ + 1 \u5219\u4e0d\u4f1a\u3002<\/p>\n
    \u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u4e3a\u4ec0\u4e48 Java \u4e2d \\” \\’a\\’ + x \\” \u4f1a\u5f15\u53d1 \\”int \u8f6c char \u635f\u5931\u7cbe\u5ea6\\” \u9519\u8bef\uff0c\u800c \\” \\’a\\’ + 1 \\” \u5374\u4e0d\u4f1a\uff1f \u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u4e3a\u4ec0\u4e48 Java \u4e2d \\&#82...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203304","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203304","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203304"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203304\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}