{"id":38181,"date":"2024-11-26T16:42:56","date_gmt":"2024-11-26T08:42:56","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38181\/"},"modified":"2024-11-26T16:42:56","modified_gmt":"2024-11-26T08:42:56","slug":"java%e5%ad%97%e8%8a%82%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38181\/","title":{"rendered":"java\u5b57\u8282\u6570\u7ec4\u600e\u4e48\u7528"},"content":{"rendered":"<blockquote><p>\n  java \u5b57\u8282\u6570\u7ec4\u7528\u4e8e\u5b58\u50a8\u539f\u59cb\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u6bcf\u4e2a\u5143\u7d20\u4e3a 8 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570 (0~255)\u3002\u53ef\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u521b\u5efa\u5b57\u8282\u6570\u7ec4\uff1a\u521b\u5efa\u5b57\u8282\u6570\u7ec4\uff1abyte[] bytearray = new byte[length]\u8bbf\u95ee\u5143\u7d20\uff1abytearray[index]\u8bbe\u7f6e\u5143\u7d20\uff1abytearray[index] = value\u5e38\u89c1\u64cd\u4f5c\uff1a\u83b7\u53d6\u957f\u5ea6\uff1abytearray.length\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1anew string(bytearray)\u8f6c\u6362\u4e3a\u5341\u516d\u8fdb\u5236\u5b57\u7b26\u4e32\uff1aarrays.tostring(bytearray)\u590d\u5236\u6570\u7ec4\uff1aarra\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/14\/2024111410190330776.jpg\" class=\"aligncenter\" title=\"java\u5b57\u8282\u6570\u7ec4\u600e\u4e48\u7528\u63d2\u56fe\" alt=\"java\u5b57\u8282\u6570\u7ec4\u600e\u4e48\u7528\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u5b57\u8282\u6570\u7ec4\u7684\u7528\u6cd5<\/strong><\/p>\n<p>Java \u4e2d\u7684\u5b57\u8282\u6570\u7ec4\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u539f\u59cb\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u6570\u7ec4\u3002\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a 8 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\uff0c\u5176\u503c\u5728 0 \u5230 255 \u4e4b\u95f4\u3002<\/p>\n<p><strong>\u521b\u5efa\u5b57\u8282\u6570\u7ec4<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u521b\u5efa\u5b57\u8282\u6570\u7ec4\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>byte[] byteArray = new byte[length];<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d length \u662f\u8981\u521b\u5efa\u7684\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<p><strong>\u8bbf\u95ee\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/strong><\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u6cd5\u8bbf\u95ee\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n<pre>byteArray[index]<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d index \u662f\u8981\u8bbf\u95ee\u7684\u5143\u7d20\u7684\u7d22\u5f15\u3002<\/p>\n<p><strong>\u8bbe\u7f6e\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/strong><\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u6cd5\u8bbe\u7f6e\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n<pre>byteArray[index] = value;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d value \u662f\u8981\u8bbe\u7f6e\u7684\u65b0\u503c\u3002<\/p>\n<p><strong>\u5e38\u89c1\u7684\u64cd\u4f5c<\/strong><\/p>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u521b\u5efa\u548c\u8bbf\u95ee\u64cd\u4f5c\u5916\uff0c\u8fd8\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u5e38\u89c1\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li> <strong>\u83b7\u53d6\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6\uff1a<\/strong>byteArray.length<\/li>\n<li> <strong>\u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1a<\/strong>new String(byteArray)<\/li>\n<li> <strong>\u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u4e3a\u5341\u516d\u8fdb\u5236\u5b57\u7b26\u4e32\uff1a<\/strong>Arrays.toString(byteArray)<\/li>\n<li> <strong>\u5c06\u5b57\u8282\u6570\u7ec4\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\uff1a<\/strong>Arrays.copyOf(byteArray, newLength)<\/li>\n<li> <strong>\u6bd4\u8f83\u4e24\u4e2a\u5b57\u8282\u6570\u7ec4\uff1a<\/strong>Arrays.equals(byteArray1, byteArray2)<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u521b\u5efa\u3001\u8bbf\u95ee\u548c\u8bbe\u7f6e\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n<pre>byte[] byteArray = new byte[5];\nbyteArray[0] = 10;\nbyteArray[1] = 20;\nbyteArray[2] = 30;\nbyteArray[3] = 40;\nbyteArray[4] = 50;\n\nSystem.out.println(byteArray[0]); \/\/ \u8f93\u51fa\uff1a10\nbyteArray[2] = 35; \/\/ \u8bbe\u7f6e\u7b2c\u4e09\u4e2a\u5143\u7d20<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<ul>\n<li>\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u662f\u65e0\u7b26\u53f7\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u7684\u8303\u56f4\u662f 0 \u5230 255\u3002<\/li>\n<li>\u8bbf\u95ee\u8d85\u51fa\u8303\u56f4\u7684\u7d22\u5f15\u4f1a\u5bfc\u81f4 ArrayIndexOutOfBoundsException \u5f02\u5e38\u3002<\/li>\n<li>\u5b57\u8282\u6570\u7ec4\u662f\u5bf9\u8c61\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b58\u50a8\u4e3a\u53d8\u91cf\u6216\u4f20\u9012\u7ed9\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u5b57\u8282\u6570\u7ec4\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u5b57\u8282\u6570\u7ec4\u7528\u4e8e\u5b58\u50a8\u539f\u59cb\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u6bcf\u4e2a\u5143\u7d20\u4e3a 8 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570 (0~255)\u3002\u53ef\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u521b\u5efa\u5b57\u8282\u6570\u7ec4\uff1a\u521b\u5efa\u5b57\u8282\u6570\u7ec4\uff1abyte[] bytearray = new byte[length]\u8bbf\u95ee\u5143\u7d20\uff1abytearray[index]\u8bbe\u7f6e\u5143\u7d20\uff1abytearray[index] = value\u5e38\u89c1\u64cd\u4f5c\uff1a\u83b7\u53d6\u957f\u5ea6\uff1abytearray.length\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1anew string(bytearray)\u8f6c\u6362\u4e3a\u5341\u516d\u8fdb\u5236\u5b57\u7b26\u4e32\uff1aarrays.tostring(bytearray)\u590d\u5236\u6570\u7ec4\uff1aarra Java \u5b57\u8282\u6570\u7ec4\u7684\u7528\u6cd5 Java \u4e2d\u7684\u5b57\u8282\u6570\u7ec4\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u539f\u59cb\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u6570\u7ec4\u3002\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a 8 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\uff0c\u5176\u503c\u5728 0 \u5230 255 \u4e4b\u95f4\u3002 \u521b\u5efa\u5b57\u8282\u6570\u7ec4 \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u521b\u5efa\u5b57\u8282\u6570\u7ec4\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b byte[] byteArray = new byte[length]; \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d length \u662f\u8981\u521b\u5efa\u7684\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6\u3002 \u8bbf\u95ee\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20 \u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u6cd5\u8bbf\u95ee\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1a byteArray[index] \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d index \u662f\u8981\u8bbf\u95ee\u7684\u5143\u7d20\u7684\u7d22\u5f15\u3002 \u8bbe\u7f6e\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20 \u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u6cd5\u8bbe\u7f6e\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1a byteArray[index] = value; \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d value \u662f\u8981\u8bbe\u7f6e\u7684\u65b0\u503c\u3002 \u5e38\u89c1\u7684\u64cd\u4f5c \u9664\u4e86\u57fa\u672c\u7684\u521b\u5efa\u548c\u8bbf\u95ee\u64cd\u4f5c\u5916\uff0c\u8fd8\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u5e38\u89c1\u64cd\u4f5c\uff1a \u83b7\u53d6\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6\uff1abyteArray.length \u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1anew String(byteArray) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-38181","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38181","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=38181"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38181\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38181"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38181"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}