{"id":800,"date":"2020-07-08T09:24:09","date_gmt":"2020-07-08T01:24:09","guid":{"rendered":"http:\/\/www.eait.co\/?p=800"},"modified":"2020-07-08T09:24:09","modified_gmt":"2020-07-08T01:24:09","slug":"java%e7%bc%96%e7%a8%8b%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/notes.coremix.net\/?p=800","title":{"rendered":"java\u7f16\u7a0b\u5165\u95e8"},"content":{"rendered":"<h1>Java\u7f16\u7a0b\u5165\u95e8<\/h1>\n<h2>\u6570\u636e\u7c7b\u578b<\/h2>\n<ul>\n<li>\n<p>\u8ba1\u7b97\u673a\u4e2d\u7684\u6700\u5c0f\u5355\u4f4d<\/p>\n<ul>\n<li>1B = 8bit   &#8212;-&gt; 1010 10101<\/li>\n<li>1kB = 1024B <\/li>\n<li>1M=1024kb<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>1GB = 1024M<\/p>\n<ul>\n<li>1TB=1024G<\/li>\n<li>1PB=1024T<\/li>\n<li>1EB =1024PB<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\u4e8c\u8fdb\u5236 110110  :1 * 2^5 + 1 * 2^4 + 0 * 2^3 .... + 0 * 2^0\n\u5341\u8fdb\u5236 342  :  3 * 10^2 + 4 * 10^1  + 2 * 10^0\n  2 \n4 \n8\n16\n32\n64\n128\n256\n512\n1024<\/code><\/pre>\n<\/li>\n<li>\n<p>\u53d8\u91cf : \u53d8\u5316\u7684\u91cf<\/p>\n<\/li>\n<li>\n<p>\u5e38\u91cf : \u4e0d\u53d8\u7684\u91cf<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/strong><\/p>\n<h4>KN-\u516b\u79cd\u6570\u636e\u7c7b\u578b\u548c\u957f\u5ea6<\/h4>\n<ul>\n<li>\n<p><strong>\u6574\u6570\u7c7b\u578b<\/strong><\/p>\n<ul>\n<li>byte : 1\u5b57\u8282(8\u4f4d)<\/li>\n<li>short : 2\u4e2a\u5b57\u8282 <\/li>\n<li>int : 4\u4e2a\u5b57\u8282<\/li>\n<li>long: 8\u4e2a\u5b57\u8282<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u6d6e\u70b9\u6570\u7c7b\u578b<\/strong><\/p>\n<ul>\n<li>\n<p>float : 4\u4e2a\u5b57\u8282\u5c0f\u6570  :\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/p>\n<\/li>\n<li>\n<p>double: 8\u4e2a\u5b57\u8282\u7684\u5c0f\u6570 : \u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570(\u7cbe\u5ea6\u9ad8\u4e00\u70b9)<\/p>\n<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\u5341\u8fdb\u5236 : 1.1  1*10^1 + 1*10^-1 =1.1\n\u4e8c\u8fdb\u5236 : 1.1  1.*2^1 + 1*2^-1 = 1+0.5=1.5\n\n\u601d\u8003:1.75\u600e\u4e48\u7528\u4e8c\u8fdb\u5236\u8868\u793a\n\u662f\u4e0d\u662f\u4efb\u4f55\u7684\u5341\u8fdb\u5236\u5c0f\u6570\u90fd\u80fd\u7531\u4e8c\u8fdb\u5236\u8868\u793a!<\/code><\/pre>\n<\/li>\n<li>\n<p>Boolean:<strong>\u5e03\u5c14\u7c7b\u578b<\/strong> :1\u4e2a\u5b57\u8282<\/p>\n<ul>\n<li>true<\/li>\n<li>false<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u5b57\u7b26\u7c7b\u578b<\/strong><\/p>\n<ul>\n<li>char : 2\u4e2a\u5b57\u8282  &#8211;&gt; 1\u4e2a\u5b57\u7b26 \u6bd4\u5982:&#8217;\u6e05&#8217;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/strong><\/p>\n<ul>\n<li>String :\u5b57\u7b26\u4e32 (\u591a\u4e2a\u5b57\u7b26\u7ec4\u6210)<\/li>\n<li>\u6570\u7ec4 (\u5b58\u591a\u4e2a\u540c\u7c7b\u578b\u7684\u6570\u636e)<\/li>\n<li>\u7c7b<\/li>\n<li>\u540e\u9762\u4f1a\u8bb2\u7684<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u5f00\u59cb\u5199\u4ee3\u7801<\/h2>\n<h3>Java\u6807\u8bc6\u7b26<\/h3>\n<p><strong>\u6807\u8bc6\u7b26<\/strong>: java\u4e2d\u6807\u8bc6\u7684\u5355\u8bcd\u7b26\u53f7: \u7c7b\u540d  \u53d8\u91cf\u540d  \u5bf9\u8c61\u540d  \u65b9\u6cd5\u540d :\u9700\u8981\u7a0b\u5e8f\u5458\u81ea\u5df1\u8d77\u540d\u5b57! \u8d77\u540d\u8981\u89c4\u8303<\/p>\n<ul>\n<li>$ ,\u6570\u5b57, \u4e0b\u5212\u7ebf, \u5b57\u6bcd\u7ec4\u6210\n<ul>\n<li>\u4e0d\u80fd\u7528\u6570\u5b57\u5f00\u5934! (\u4f46\u662f\u5b57\u6bcd\u540e\u9762\u53ef\u4ee5\u8ddf\u6570\u5b57)<\/li>\n<li>\u4e00\u822c\u4e0d\u7528$\u5f00\u5934<\/li>\n<li>\u4e25\u683c\u533a\u5206\u5927\u5c0f\u5199<\/li>\n<li>\u4e0d\u80fd\u4f7f\u7528\u5173\u952e\u5b57 <\/li>\n<li>java\u7a0b\u5e8f\u4e2d\u88ab\u8d4b\u4e88\u7279\u6b8a\u542b\u4e49\u7684\u5355\u8bcd(\u4e0d\u80fd\u7528\u4e8e\u6807\u8bc6\u7b26\u8d77\u540d)<\/li>\n<li>\u4fdd\u7559\u5b57: \u88abjava\u7559\u4e0b\u6765\u505a\u540e\u5907\u7528\u7684\u4e00\u4e9b\u5355\u8bcd(\u4ee5\u540e\u53ef\u80fd\u6210\u4e3a\u5173\u952e\u5b57)<br \/>\n<h4>KN-\u5927\u5c0f\u9a7c\u5cf0\u7684\u5e94\u7528\u573a\u666f<\/h4>\n<\/li>\n<li><strong>\u547d\u540d\u89c4\u5219<\/strong><\/li>\n<li>\u5927\u9a7c\u5cf0: \u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u90fd\u5927\u5199!  &#8212;&#8211;&gt;\u7528\u4e8e\u7c7b\u540d\u7684\u4f7f\u7528<\/li>\n<li>\u5c0f\u9a7c\u5cf0: \u9996\u5b57\u6bcd\u5c0f\u5199,\u540e\u9762\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199 &#8212;&gt; \u65b9\u6cd5! \u53d8\u91cf! &#8230;.<\/li>\n<li>\u5177\u4f53\u770b\u516c\u53f8\u8981\u6c42!!<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u5173\u952e\u5b57<\/h3>\n<p>IDEA\u4e2d\u663e\u793a\u6a59\u8272\u7684\u5355\u8bcd(\u8001\u5e08\u7684\u4e3b\u9898)<\/p>\n<p>Java\u7a0b\u5e8f\u4e2d\u88ab\u8d4b\u4e88\u7279\u6b8a\u542b\u4e49\u7684\u5355\u8bcd<\/p>\n<ul>\n<li>\n<p>\u5173\u952e\u5b57\u90fd\u662f\u5c0f\u5199\u7684<\/p>\n<ul>\n<li>\n<p>\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u6570\u636e\u7c7b\u578b<\/p>\n<\/li>\n<li>\n<p>\u6570\u636e\u7c7b\u578b\u7684\u503c(boolean\u7c7b\u578b\u503c)<\/p>\n<\/li>\n<li>\n<p>\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5: if else for<\/p>\n<\/li>\n<li>\n<p>\u8bbf\u95ee\u63a7\u5236\u6743\u9650 :public &#8230;.<\/p>\n<\/li>\n<li>\n<p>\u53d8\u91cf\u6216\u8005\u65b9\u6cd5\u7684\u4fee\u9970: static<\/p>\n<\/li>\n<li>\n<p>\u5f02\u5e38\u5904\u7406: try catch <\/p>\n<\/li>\n<\/ul>\n<p>&#8230;&#8230;&#8230;<\/p>\n<\/li>\n<\/ul>\n<p>\u4e3b\u65b9\u6cd5: \u662f\u7a0b\u5e8f\u7684\u5165\u53e3!<\/p>\n<pre><code class=\"language-java\"> public static void main(String[] args) {\n }<\/code><\/pre>\n<h3>\u8fd0\u7b97\u7b26<\/h3>\n<h4>\u7b97\u672f\u8fd0\u7b97\u7b26<\/h4>\n<ul>\n<li>+<\/li>\n<li>&#8211;<\/li>\n<li>*<\/li>\n<li>\/<\/li>\n<li>\n<p>% (\u53d6\u4f59)<\/p>\n<pre><code class=\"language-java\">public class TestClass {\n  public static void main(String[] args) {\n      \/\/\u53d8\u91cf:\u53ef\u53d8\u5316\u7684\u503c ----&gt;   byte :\u6570\u636e\u7c7b\u578b\n      \/\/               a : \u53d8\u91cf\u540d\n      \/\/               = : \u8d4b\u503c\u7b26\u53f7!\n      \/\/               4 : \u53d8\u91cf\u503c\n      byte a = 5;\n      byte b = 2;\n      \/\/a=10; \u53d8\u91cf\u53ef\u4ee5\u53d8\u5316\u503c\n      \/\/System.out.println(a);\n\n      \/\/\u5e38\u91cf:\u4e0d\u53ef\u53d8\u5316\u7684\u503c -----&gt; final : \u5173\u952e\u5b57(\u4fee\u9970\u5e38\u91cf ,....)\n      \/\/            int : \u6570\u636e\u7c7b\u7c7b\u578b\n      \/\/            c : \u53d8\u91cf\u540d\n      \/\/            = : \u8d4b\u503c\u7b26\u53f7!\n      \/\/            1 : \u5e38\u91cf\u503c\n      final int c =1;\n      \/\/c=10;\u5e38\u91cf\u4e0d\u80fd\u4fee\u6539\u503c!\n      System.out.println(a%b); \/\/\u53d6\u4f59 5 \u00f7 2 = 2 ......1(\u53d6\u4f59)\n\n  }\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<h4>\u5173\u7cfb\u8fd0\u7b97\u7b26\uff1a\u5224\u65ad\u7ed3\u679c\u662f\u4e00\u4e2aboolean\u503c\uff01\uff08\u53ea\u6709true \u548cfalse\uff09<\/h4>\n<ul>\n<li><code>&gt;<\/code><\/li>\n<li><code>&lt;<\/code><\/li>\n<li><code>==<\/code><\/li>\n<li><code>!=<\/code><\/li>\n<li><code>&gt;=<\/code><\/li>\n<li>\n<p><code>&lt;=<\/code><\/p>\n<pre><code class=\"language-java\">public class Test_02 {\n  public static void main(String[] args) {\n      int a =10;\n      int b =20;\n      System.out.println(a&gt;=b);\n\n  }\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n<h4>\u6761\u4ef6\u8fd0\u7b97\u7b26\uff08\u4e0e\u6216\u975e\uff09(boolean\u503c\u7684\u8fd0\u7b97)<\/h4>\n<ul>\n<li>&amp; \uff1a\u4e0e\u7b26\u53f7  &#8211;&gt; \u4e24\u8005\u6761\u4ef6\u90fd\u6ee1\u8db3\u4e86 \u5c31\u4e3atrue \u5426\u5219\u4e3afalse<\/li>\n<li>| \uff1a\u6216\u7b26\u53f7   &#8211;&gt;  \u4e24\u8005\u6761\u4ef6\u6ee1\u8db3\u5176\u4e2d\u4e00\u4e2a\u5c31\u4e3atrue ,\u90fd\u672a\u8fbe\u5230\u4e3afalse<\/li>\n<li>\uff01\uff1a\u53d6\u53cd <\/li>\n<\/ul>\n<h3>\u6ce8\u91ca<\/h3>\n<p>\u6ce8\u91ca: java\u7f16\u8bd1\u5668\u4e0d\u4f1a\u53bb\u7ffb\u8bd1\u7684\u5185\u5bb9<\/p>\n<ul>\n<li>\u5355\u884c\u6ce8\u91ca   :  \/\/<\/li>\n<li>\u591a\u884c\u6ce8\u91ca : \/*\u56de\u8f66    <code>\/ * \u5f00\u59cb * \/\u7ed3\u675f <\/code><\/li>\n<li>\u6587\u6863\u6ce8\u91ca: \/*<em>\u56de\u8f66   \u548c\u591a\u884c\u6ce8\u91ca\u7684\u533a\u522b\u5c31\u662f\u7b2c\u4e00\u884c\u6709\u4e24\u4e2a <\/em> <\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Java\u7f16\u7a0b\u5165\u95e8 \u6570\u636e\u7c7b\u578b \u8ba1\u7b97\u673a\u4e2d\u7684\u6700\u5c0f\u5355\u4f4d 1B = 8bit &#8212;-&gt; 1010 101 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,28],"tags":[],"class_list":["post-800","post","type-post","status-publish","format-standard","hentry","category-java"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts\/800","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=800"}],"version-history":[{"count":1,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts\/800\/revisions"}],"predecessor-version":[{"id":801,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts\/800\/revisions\/801"}],"wp:attachment":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}