{"id":1429,"date":"2023-07-12T13:25:52","date_gmt":"2023-07-12T05:25:52","guid":{"rendered":"https:\/\/fireinsect.top\/?p=1429"},"modified":"2023-07-21T10:16:08","modified_gmt":"2023-07-21T02:16:08","slug":"%e9%9d%a2%e8%af%95%e9%a2%98%e6%95%b4%e7%90%86","status":"publish","type":"post","link":"https:\/\/fireinsect.top\/index.php\/2023\/07\/12\/%e9%9d%a2%e8%af%95%e9%a2%98%e6%95%b4%e7%90%86\/","title":{"rendered":"\u9762\u8bd5\u9898\u6574\u7406"},"content":{"rendered":"\n<p>\u8be5\u6587\u7ae0\u8f6c\u81eacsdn\uff0c\u624b\u6253\u4e00\u904d\u52a0\u6df1\u8bb0\u5fc6\uff08\u72d7\u5934\uff09<\/p>\n\n\n\n<!--more-->\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h4>1. JDK\u548cJRE\u7684\u533a\u522b<\/h4>\n<p>JDK\uff1aJava Development Kit\u7684\u7b80\u79f0\uff0cjava\u5f00\u53d1\u5de5\u5177\u5305\uff0c\u63d0\u4f9b\u4e86java\u7684\u5f00\u53d1\u73af\u5883\u548c\u8fd0\u884c\u73af\u5883<\/p>\n<p>JRE\uff1aJava Runtime Environment\u7684\u7b80\u79f0\uff0cJava\u8fd0\u884c\u73af\u5883\uff0c\u4e3ajava\u7684\u8fd0\u884c\u63d0\u4f9b\u4e86\u6240\u9700\u73af\u5883<\/p>\n<h4>2. ==\u548cequals\u7684\u533a\u522b<\/h4>\n<p>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b==\u7684\u6548\u679c\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u5982\u4e0b\u6240\u793a<\/p>\n<ul>\n<li>\u57fa\u672c\u7c7b\u578b\uff1a\u6bd4\u8f83\u7684\u662f\u503c\u662f\u5426\u76f8\u540c\uff1b<\/li>\n<li>\u5f15\u7528\u7c7b\u578b\uff1a\u6bd4\u8f83\u7684\u662f\u5f15\u7528\uff08\u5730\u5740\uff09\u662f\u5426\u76f8\u540c\uff1b<\/li>\n<\/ul>\n<pre><code class=\"language-java\">String x=&quot;string&quot;;\nString y=&quot;string&quot;;\nString z= new String(&quot;string&quot;);\nx==y;\/\/true\nx==z;\/\/false\nx.equals(y);\/\/true\nx.equals(z);\/\/true\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684x\u548cy\u76f4\u63a5\u4f7f\u7528&quot;string&quot;\uff0c\u8fd9\u91cc\u662f\u76f4\u63a5\u5728\u5e38\u91cf\u6c60\u91cc\u521b\u5efa\u4e86\u5b57\u7b26\u4e32\uff0c\u5e76\u7ed9\u4e0e\u4e24\u8005\u4e00\u8d77\u5f15\u7528\uff0c\u6240\u4ee5==\u662ftrue\uff0c\u800cnew String()\u65b9\u6cd5\u91cd\u5199\u5f00\u8f9f\u4e86\u5185\u5b58\u7a7a\u95f4\uff0c\u6240\u4ee5\u4e3afalse\u3002<\/p>\n<p>\u800cequals()\u65b9\u6cd5\u672c\u8d28\u4e0a\u662f==\uff0c\u4f46\u5982String\u3001Integer\u91cd\u5199\u4e86equals\u65b9\u6cd5\uff0c\u628a\u5b83\u53d8\u6210\u4e86\u503c\u7684\u6bd4\u8f83\u3002\u800c\u5982\u679c\u6211\u4eec\u81ea\u5df1\u521b\u5efa\u7684\u7c7b\u5e76\u6ca1\u6709\u91cd\u5199equals\u65b9\u6cd5\uff0c\u5176\u9ed8\u8ba4\u6bd4\u8f83\u7684\u4f9d\u7136\u662f\u5f15\u7528\u3002<\/p>\n<h4>3.\u4e24\u4e2a\u5bf9\u8c61\u7684hashCode()\u76f8\u540c\uff0c\u5219equals\uff08\uff09\u4e5f\u4e00\u5b9a\u4e3atrue\uff0c\u5bf9\u5417\uff1f<\/h4>\n<p>\u4e0d\u5bf9\uff0c\u5982<\/p>\n<pre><code class=\"language-java\">String str1=&quot;\u901a\u8bdd&quot;;\nString str2=&quot;\u91cd\u5730&quot;;\n<\/code><\/pre>\n<p>\u4e24\u8005hashCode\u662f\u76f8\u7b49\u7684\uff0c\u4f46\u5b9e\u9645\u4e0aequals\u5e76\u4e0d\u76f8\u540c\uff0c\n\u539f\u56e0\u662fhashCode\u76f8\u7b49\u4ec5\u4ec5\u8868\u793a\u4e24\u8005\u952e\u503c\u5bf9\u7684\u54c8\u5e0c\u503c\u76f8\u7b49\uff0c\u4f46\u5e76\u4e0d\u4e00\u5b9a\u8868\u793a\u952e\u503c\u5bf9\u76f8\u7b49\uff0c\u4f46\u53cd\u4e4b\uff0cequals\u4e3atrue\uff0chashCode\u5c31\u4e00\u5b9a\u76f8\u7b49\u3002<\/p>\n<h4>4.final\u5728java\u4e2d\u7684\u7528\u5904<\/h4>\n<ul>\n<li>final\u4fee\u9970\u7684\u7c7b\u53eb\u6700\u7ec8\u7c7b\uff0c\u8be5\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f<\/li>\n<li>final\u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u80fd\u88ab\u91cd\u5199<\/li>\n<li>final\u4fee\u9970\u7684\u53d8\u91cf\u53eb\u5e38\u91cf\uff0c\u5fc5\u987b\u5b9e\u73b0\u521d\u59cb\u5316\uff0c\u521d\u59cb\u5316\u4e4b\u540e\u503c\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u4e86\uff0c\u4e0e\u4e4b\u533a\u5206\u7684\u662f\u88abstatic\u4fee\u9970\u7684\u53d8\u91cf\u53eb\u9759\u6001\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<h4>5.java\u4e2d\u7684Math.round(-1.5)\u7b49\u4e8e\u591a\u5c11<\/h4>\n<p>\u7b49\u4e8e-1\uff0c\u8be5\u65b9\u6cd5\u4e3a\u201c\u56db\u820d\u4e94\u5165\u201d\u65b9\u6cd5\uff0c\u4f46\u5b9e\u9645\u4f7f\u7528\u53d6\u6574\u662f\u5411\u53f3\u53d6\u6574\u7684\uff0c\u56e0\u6b64\u4e3a-1\u3002<\/p>\n<h4>6.String\u5c5e\u4e8e\u57fa\u7840\u7684\u6570\u636e\u7c7b\u578b\u5417\uff1f<\/h4>\n<p>\u4e0d\u5c5e\u4e8e\uff0cJava\u7684\u57fa\u7840\u6570\u636e\u7c7b\u578b\u6709\n<strong><em>byte\u3001boolean\u3001char\u3001short\u3001int\u3001float\u3001long\u3001double<\/em><\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h4>7.Java\u4e2d\u7684\u64cd\u4f5c\u5b57\u7b26\u4e32\u6709\u54ea\u4e9b\u7c7b\uff0c\u5b83\u4eec\u4e4b\u95f4\u7684\u533a\u522b\uff1f<\/h4>\n<p>\u64cd\u4f5c\u5b57\u7b26\u4e32\u7684\u7c7b\u6709\uff1aString\u3001StringBuffer\u3001StringBuilder\u3002\nString\u548cStringBuffer\u3001StringBuilder\u6700\u5927\u7684\u533a\u522b\u5728\u4e8e\uff0cStringBuffer\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800cStringBuilder\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4f46StringBuilder\u7684\u6027\u80fd\u5374\u9ad8\u4e8eStringBuffer\uff0c\u6240\u4ee5\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u63a8\u8350\u4f7f\u7528StringBuilder\uff0c\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528StringBuffer\u3002<\/p>\n<h4>8.String str=&quot;i&quot;\u548cString str=new String(&quot;i&quot;)\u4e00\u6837\u5417\uff1f<\/h4>\n<p>\u4e0d\u4e00\u6837\uff0c\u4e24\u8005\u5185\u5b58\u5206\u914d\u65b9\u5f0f\u4e0d\u540c\uff0c\u4f7f\u7528=&quot;i&quot;\u65b9\u5f0f\uff0cjava\u865a\u62df\u673a\u4f1a\u5c06\u5176\u5206\u914d\u5230\u5e38\u91cf\u6c60\uff0c\u5982\u679c\u5e38\u91cf\u6c60\u5185\u5b58\u5728\uff0c\u5219\u6307\u5411\u5e38\u91cf\u6c60\u5185\u7684string\uff0c\u800cnew String\u5219\u4f1a\u88ab\u5206\u914d\u5230\u5806\u5185\u5b58\u4e2d\u3002<\/p>\n<h4>9.\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u53cd\u8f6c<\/h4>\n<p>\u4f7f\u7528StringBuilder\u6216\u8005StringBuffer\u7684reverse()\u65b9\u6cd5\u3002<\/p>\n<h4>10.String\u7c7b\u7684\u5e38\u7528\u65b9\u6cd5\u6709\uff1f<\/h4>\n<ul>\n<li>indexOF():\u8fd4\u56de\u6307\u5b9a\u5b57\u7b26\u7684\u7d22\u5f15\u3002<\/li>\n<li>charAt():\u8fd4\u56de\u6307\u5b9a\u7d22\u5f15\u5904\u7684\u5b57\u7b26\u3002<\/li>\n<li>replace()\uff1a\u5b57\u7b26\u4e32\u66ff\u6362\u3002<\/li>\n<li>trim():\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7a7a\u767d<\/li>\n<li>split():\u5206\u5272\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u4e00\u4e2a\u5206\u5272\u540e\u7684\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/li>\n<li>getBytes():\u8fd4\u56de\u5b57\u7b26\u4e32\u7684byte\u7c7b\u578b\u6570\u7ec4\u3002<\/li>\n<li>length():\u8fd4\u56de\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/li>\n<li>toLowerCase():\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u5b57\u6bcd\u3002<\/li>\n<li>toUpperCase():\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd\u3002<\/li>\n<li>substring():\u622a\u53d6\u5b57\u7b26\u4e32\u3002<\/li>\n<li>equals():\u5b57\u7b26\u4e32\u6bd4\u8f83\u3002<\/li>\n<\/ul>\n<h4>11.\u62bd\u8c61\u7c7b\u5fc5\u987b\u8981\u6709\u62bd\u8c61\u65b9\u6cd5\u5417\uff1f<\/h4>\n<p>\u4e0d\u9700\u8981\uff0c\u62bd\u8c61\u7c7b\u4e0d\u4e00\u5b9a\u8981\u6709\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n<h4>12.\u666e\u901a\u7c7b\u548c\u62bd\u8c61\u7c7b\u6709\u54ea\u4e9b\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>\u666e\u901a\u7c7b\u4e0d\u80fd\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\uff0c\u62bd\u8c61\u7c7b\u53ef\u4ee5\u3002<\/li>\n<li>\u62bd\u8c61\u7c7b\u4e0d\u80fd\u76f4\u63a5\u5b9e\u4f8b\u5316\uff0c\u666e\u901a\u7c7b\u53ef\u4ee5\u3002<\/li>\n<\/ul>\n<h4>13.\u62bd\u8c61\u7c7b\u80fd\u4f7f\u7528final\u4fee\u9970\u5417\uff1f<\/h4>\n<p>\u4e0d\u80fd\uff0c\u5b9a\u4e49\u62bd\u8c61\u7c7b\u5c31\u662f\u8ba9\u5176\u4ed6\u7c7b\u7ee7\u627f\u7684\uff0c\u5982\u679c\u5b9a\u4e49\u4e3afinal\u8be5\u7c7b\u5c31\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u8fd9\u6837\u5c31\u4ea7\u751f\u77db\u76fe\u4e86\u3002<\/p>\n<h4>14.\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>\u5b9e\u73b0\uff1a\u62bd\u8c61\u7c7b\u7684\u5b50\u7c7b\u4f7f\u7528extends\u6765\u7ee7\u627f\uff1b\u63a5\u53e3\u5fc5\u987b\u4f7f\u7528implments\u6765\u5b9e\u73b0\u63a5\u53e3\u3002<\/li>\n<li>\u6784\u9020\u51fd\u6570\uff1a\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u6784\u9020\u51fd\u6570\uff0c\u63a5\u53e3\u4e0d\u80fd\u3002<\/li>\n<li>\u5b9e\u73b0\u6570\u91cf\uff1a\u7c7b\u53ef\u4ee5\u6709\u591a\u4e2a\u63a5\u53e3\uff0c\u4f46\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u62bd\u8c61\u7c7b\u3002<\/li>\n<li>\u8bbf\u95ee\u4fee\u9970\u7b26\uff1a\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u9ed8\u8ba4\u4f7f\u7528public\u4fee\u9970\uff0c\u62bd\u8c61\u7c7b\u4e2d\u7684\u65b9\u6cd5\u53ef\u4ee5\u662f\u4efb\u610f\u8bbf\u95ee\u4fee\u9970\u7b26\u3002<\/li>\n<\/ul>\n<h4>15.Java\u4e2d\u7684IO\u6d41\u5206\u4e3a\u51e0\u79cd\uff1f<\/h4>\n<p>\u6309\u529f\u80fd\u6765\u5206\uff1a\u8f93\u5165\u6d41\uff08input\uff09\u3001\u8f93\u51fa\u6d41\uff08output\uff09<\/p>\n<p>\u6309\u7c7b\u578b\u6765\u5206\uff1a\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41<\/p>\n<p>\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u7684\u533a\u522b\u662f\uff1a\u5b57\u8282\u6d41\u63098\u4f4d\u4f20\u8f93\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u8f93\u5165\u8f93\u51fa\u6570\u636e\uff0c\u5b57\u7b26\u6d41\u630916\u4f4d\u4f20\u8f93\u4ee5\u5b57\u7b26\u4f4d\u5355\u4f4d\u8f93\u5165\u8f93\u51fa\u6570\u636e\u3002<\/p>\n<h4>16.BIO\u3001NIO\u3001AIO\u6709\u4ec0\u4e48\u533a\u522b<\/h4>\n<ul>\n<li>BIO\uff1aBlock IO\u540c\u6b65\u963b\u585e\u5f0fIO\uff0c\u5c31\u662f\u6211\u4eec\u5e73\u5e38\u4f7f\u7528\u7684\u4f20\u7edfIO\uff0c\u5b83\u7684\u7279\u70b9\u662f\u6a21\u5f0f\u7b80\u5355\u4f7f\u7528\u65b9\u4fbf\uff0c\u5e76\u53d1\u5904\u7406\u80fd\u529b\u4f4e\u3002<\/li>\n<li>NIO\uff1aNon IO\u540c\u6b65\u975e\u963b\u585eIO\uff0c\u662f\u4f20\u7edfIO\u7684\u5347\u7ea7\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u901a\u8fc7CHannel\uff08\u901a\u9053\uff09\u901a\u8baf\uff0c\u5b9e\u73b0\u4e86\u591a\u8def\u590d\u7528\u3002<\/li>\n<li>AIO\uff1aAsynchronous IO \u662fNIO\u7684\u5347\u7ea7\uff0c\u4e5f\u53ebNIO2\uff0c\u5b9e\u73b0\u4e86\u5f02\u6b65\u975e\u5835\u585eIO\uff0c\u5f02\u6b65IO\u7684\u64cd\u4f5c\u57fa\u4e8e\u4e8b\u4ef6\u548c\u56de\u8c03\u673a\u5236\u3002<\/li>\n<\/ul>\n<h4>17.Files\u7684\u5e38\u7528\u65b9\u6cd5\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n<ul>\n<li>Files.exists():\u68c0\u6d4b\u6587\u4ef6\u8def\u5f84\u662f\u5426\u5b58\u5728\u3002<\/li>\n<li>Files.createFile():\u521b\u5efa\u6587\u4ef6\u3002<\/li>\n<li>Files.createDirectory():\u521b\u5efa\u6587\u4ef6\u5939\u3002<\/li>\n<li>Files.delete():\u5220\u9664\u4e00\u4e2a\u6587\u4ef6\u6216\u76ee\u5f55\u3002<\/li>\n<li>Files.copy():\u590d\u5236\u6587\u4ef6\u3002<\/li>\n<li>Files.move():\u79fb\u52a8\u6587\u4ef6\u3002<\/li>\n<li>Files.size():\u67e5\u770b\u6587\u4ef6\u4e2a\u6570\u3002<\/li>\n<li>Files.read():\u8bfb\u53d6\u6587\u4ef6\u3002<\/li>\n<li>Files.write():\u5199\u5165\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<h4>18.java\u5bb9\u5668\u6709\u54ea\u4e9b\uff1f<\/h4>\n<p>Java\u5bb9\u5668\u5206\u4e3aCollection\u548cMap\u4e24\u5927\u7c7b\uff0c\u5176\u4e0b\u6709\u8bb8\u591a\u5b50\u7c7b<\/p>\n<ul>\n<li>Collection\n<ul>\n<li>List\n<ul>\n<li>ArrayList<\/li>\n<li>LinkedList<\/li>\n<li>Vector<\/li>\n<li>Stack<\/li>\n<\/ul>\n<\/li>\n<li>Set\n<ul>\n<li>HashSet<\/li>\n<li>LinkedHashSet<\/li>\n<li>TreeSet<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Map\n<ul>\n<li>HashMap\n<ul>\n<li>LinkedHashMap<\/li>\n<\/ul>\n<\/li>\n<li>TreeMap<\/li>\n<li>ConcurrentHashMap<\/li>\n<li>Hashtable<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h4>19.Collection\u548cCollections\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>Collection\u662f\u4e00\u4e2a\u96c6\u5408\u63a5\u53e3\uff0c\u5b83\u63d0\u4f9b\u4e86\u5bf9\u96c6\u5408\u5bf9\u8c61\u8fdb\u884c\u57fa\u672c\u64cd\u4f5c\u7684\u901a\u7528\u63a5\u53e3\u65b9\u6cd5\uff0c\u6240\u6709\u96c6\u5408\u90fd\u662f\u5b83\u7684\u5b50\u7c7b\uff0c\u6bd4\u5982List\u3001Set\u7b49\u3002<\/li>\n<li>Collections\u662f\u4e00\u4e2a\u5305\u88c5\u7c7b\uff0c\u5305\u542b\u4e86\u5f88\u591a\u9759\u6001\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\uff0c\u5c31\u50cf\u4e00\u4e2a\u5de5\u5177\u7c7b\u3002<\/li>\n<\/ul>\n<h4>20.List\u3001Set\u3001Map\u4e4b\u95f4\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<p>List\u3001Set\u3001Map\u7684\u4e3b\u8981\u533a\u522b\u4e3a\u4e24\u4e2a\u65b9\u9762\uff1a\u5143\u7d20\u662f\u5426\u6709\u5e8f\u3001\u662f\u5426\u5141\u8bb8\u5143\u7d20\u91cd\u590d\u3002\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>\u5b50\u7c7b<\/th>\n<th>\u5143\u7d20\u6709\u5e8f<\/th>\n<th>\u5141\u8bb8\u5143\u7d20\u91cd\u590d<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>List<\/td>\n<td><\/td>\n<td>\u662f<\/td>\n<td>\u662f<\/td>\n<\/tr>\n<tr>\n<td>Set<\/td>\n<td>AbstractSet<\/td>\n<td>\u5426<\/td>\n<td>\u5426<\/td>\n<\/tr>\n<tr>\n<td>Set<\/td>\n<td>HashSet<\/td>\n<td>\u5426<\/td>\n<td>\u5426<\/td>\n<\/tr>\n<tr>\n<td>Set<\/td>\n<td>TreeSet<\/td>\n<td>\u662f\uff08\u4e8c\u53c9\u6811\u6392\u5e8f\uff09<\/td>\n<td>\u5426<\/td>\n<\/tr>\n<tr>\n<td>Map<\/td>\n<td>AbstractMap<\/td>\n<td>\u5426<\/td>\n<td>Key\u503c\u5fc5\u987b\u552f\u4e00\uff0cvalue\u53ef\u91cd\u590d<\/td>\n<\/tr>\n<tr>\n<td>Map<\/td>\n<td>HashMap<\/td>\n<td>\u5426<\/td>\n<td>Key\u503c\u5fc5\u987b\u552f\u4e00\uff0cvalue\u53ef\u91cd\u590d<\/td>\n<\/tr>\n<tr>\n<td>Map<\/td>\n<td>TreeMap<\/td>\n<td>\u662f\uff08\u4e8c\u53c9\u6811\u6392\u5e8f\uff09<\/td>\n<td>Key\u503c\u5fc5\u987b\u552f\u4e00\uff0cvalue\u53ef\u91cd\u590d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>21.HashMap\u548cHashtable\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>\u5b58\u50a8\uff1aHashMap\u5141\u8bb8key\u548cvalue\u4e3anull\uff0c\u800cHashtable\u4e0d\u5141\u8bb8\u3002<\/li>\n<li>\u7ebf\u7a0b\u5b89\u5168\uff1aHashtable\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800cHashMap\u662f\u4e0d\u5b89\u5168\u7684\u3002<\/li>\n<li>\u63a8\u8350\u4f7f\u7528\uff1a\u5728Hashtable\u7684\u7c7b\u6ce8\u91ca\u53ef\u4ee5\u770b\u5230\uff0cHashtable\u662f\u4fdd\u7559\u7c7b\u4e0d\u5efa\u8bae\u4f7f\u7528\uff0c\u63a8\u8350\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528HashMap\u4ee3\u66ff\uff0c\u5982\u679c\u9700\u8981\u591a\u7ebf\u7a0b\u4f7f\u7528\u5219\u7528ConcurrentHashMap\u4ee3\u66ff\u3002<\/li>\n<\/ul>\n<h4>22.\u5982\u4f55\u51b3\u5b9a\u4f7f\u7528HashMap\u8fd8\u662fTreeMap\uff1f<\/h4>\n<p>\u5bf9\u4e8e\u5728Map\u4e2d\u63d2\u5165\u3001\u5220\u9664\u3001\u5b9a\u4f4d\u4e00\u4e2a\u5143\u7d20\u8fd9\u7c7b\u64cd\u4f5c\uff0cHashMap\u662f\u6700\u597d\u7684\u9009\u62e9\uff0c\u56e0\u4e3a\u76f8\u5bf9\u800c\u8a00HashMap\u7684\u63d2\u5165\u4f1a\u66f4\u5feb\uff0c\u4f46\u5982\u679c\u4f60\u8981\u5bf9\u4e00\u4e2akey\u96c6\u5408\u8fdb\u884c\u6709\u5e8f\u7684\u904d\u5386\uff0c\u90a3TreeMap\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n<h4>23.\u8bf4\u4e00\u4e0bHashMap\u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n<p>HashMap\u662f\u7ed9\u4e88Hash\u7b97\u6cd5\u5b9e\u73b0\u7684\uff0c\u5b83\u901a\u8fc7put\uff08key\uff0cvalue\uff09\u65b9\u6cd5\u5b58\u50a8\uff0cget\uff08key\uff09\u65b9\u6cd5\u83b7\u53d6\uff0c\u5f53\u4f20\u5165\u503c\u65f6\uff0cHashMap\u4f1a\u6839\u636ekey\u7684HashCode()\u7684\u54c8\u5e0c\u503c\u518d\u6b21\u8ba1\u7b97hash\u503c\uff08\u76f8\u5f53\u4e8e\u4e24\u6b21hash\u8ba1\u7b97\uff09\uff0c\u6839\u636e\u54c8\u5e0c\u503c\u5c06value\u4fdd\u5b58\u5728bucket\u91cc\u3002\u5f53\u8ba1\u7b97\u51fa\u7684\u54c8\u5e0c\u76f8\u540c\u65f6\uff08\u54c8\u5e0c\u51b2\u7a81\uff09\uff0cHashMap\u4f1a\u4f7f\u7528\u94fe\u8868\u548c\u7ea2\u9ed1\u6811\u6765\u5b58\u50a8\u76f8\u540chash\u503c\u7684value\u3002<br>\n\u5f53map\u7684\u6570\u7ec4\u957f\u5ea6\u5927\u4e8e\u7b49\u4e8e64\uff0c\u94fe\u8868\u957f\u5ea6\u5927\u4e8e\u7b49\u4e8e8\uff0c\u518d\u6b21\u5411\u8be5\u94fe\u8868put\u65f6\uff0c\u4f1a\u8fdb\u884c\u6811\u5316\u3002<br>\n\u6570\u7ec4\u957f\u5ea6\u5c0f\u4e8e64\uff0c\u94fe\u8868\u957f\u5ea6\u5c0f\u4e8e6\u65f6\u4f1a\u53cd\u6811\u5316\u3002<\/p>\n<h4>24.\u8bf4\u4e00\u4e0bHashSet\u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n<p>HashSet\u662f\u57fa\u4e8eHashMap\u5b9e\u73b0\u7684\uff0cHashSet\u5e95\u5c42\u4f7f\u7528HashMap\u6765\u4fdd\u5b58\u6240\u6709\u5143\u7d20\uff0c\u56e0\u6b64HashSet\u7684\u5b9e\u73b0\u6bd4\u8f83\u7b80\u5355\uff0c\u5176\u76f8\u5173\u64cd\u4f5c\u57fa\u672c\u90fd\u662f\u76f4\u63a5\u8c03\u7528HashMap\u5e95\u5c42\u7684\u76f8\u5173\u65b9\u6cd5\u5b9e\u73b0\u7684\uff0cHashSet\u4e0d\u5141\u8bb8\u91cd\u590d\u7684\u503c\u3002<\/p>\n<h4>25.ArrayList\u548cLinkedList\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<ul>\n<li>\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff1aArrayList\u662f\u52a8\u6001\u6570\u7ec4\u7684\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff0c\u800cLinkedList\u662f\u53cc\u5411\u94fe\u8868\u5b9e\u73b0\u3002<\/li>\n<li>\u968f\u673a\u8bbf\u95ee\u6548\u7387\uff1a\u5728\u968f\u673a\u8bbf\u95ee\u4e0b\uff0cArrayList\u6548\u7387\u66f4\u9ad8\uff0c\u56e0\u4e3aLinkedList\u662f\u7ebf\u6027\u7684\u6570\u636e\u5b58\u50a8\uff0c\u9700\u8981\u79fb\u52a8\u6307\u9488\u4ece\u524d\u5f80\u540e\u4f9d\u6b21\u67e5\u627e\u3002<\/li>\n<li>\u589e\u52a0\u548c\u5220\u9664\u6548\u7387\uff1a\u5728\u975e\u9996\u5c3e\u7684\u589e\u5220\u4e2d\uff0cLinkedList\u6548\u7387\u66f4\u9ad8\uff0c\u56e0\u4e3aArrayList\u5728\u589e\u5220\u64cd\u4f5c\u65f6\u4f1a\u5f71\u54cd\u6570\u7ec4\u5185\u5176\u4ed6\u6570\u636e\u7684\u4e0b\u6807\u3002<\/li>\n<\/ul>\n<h4>26.\u5982\u4f55\u5b9e\u73b0\u6570\u7ec4\u548cList\u4e4b\u95f4\u7684\u8f6c\u6362\uff1f<\/h4>\n<ul>\n<li>\u6570\u7ec4\u8f6cList\uff1a\u4f7f\u7528Arrays.asList(array)\u8fdb\u884c\u8f6c\u6362<\/li>\n<li>List\u8f6c\u6570\u7ec4\uff1a\u4f7f\u7528List\u81ea\u5e26\u7684toArray()\u65b9\u6cd5\u8f6c\u6362\u3002<\/li>\n<\/ul>\n<h4>27.ArrayList\u548cVector\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<ul>\n<li>\u7ebf\u7a0b\u5b89\u5168\uff1aVector\u4f7f\u7528\u4e86Synchronized\u65b9\u6cd5\u6765\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\uff0c\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800cArrayList\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>\n<li>\u6027\u80fd\uff1aArrayList\u5728\u6027\u80fd\u65b9\u9762\u8981\u4f18\u4e8eVector\u3002<\/li>\n<li>\u6269\u5bb9\uff1aArrayList\u548cVector\u90fd\u4f1a\u6839\u636e\u5b9e\u9645\u7684\u9700\u8981\u52a8\u6001\u7684\u8c03\u6574\u5bb9\u91cf\uff0c\u53ea\u4e0d\u8fc7Vector\u6269\u5bb9\u6bcf\u6b21\u589e\u52a01\u500d\uff0c\u800cArrayList\u53ea\u589e\u52a0\u4e00\u534a\u3002<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h4>28.Array\u548cArrayList\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>Array\u53ef\u4ee5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5bf9\u8c61\uff0cArrayList\u53ea\u80fd\u5b58\u50a8\u5bf9\u8c61<\/li>\n<li>Array\u662f\u6307\u5b9a\u56fa\u5b9a\u5927\u5c0f\u7684\uff0c\u800cArrayList\u5927\u5c0f\u662f\u81ea\u52a8\u62d3\u5c55\u7684\u3002<\/li>\n<li>Array\u5185\u7f6e\u65b9\u6cd5\u6ca1\u6709ArrayList\u591a\uff0c\u6bd4\u5982addAll\u3001removeAll\u3001iteration\u7b49\u3002<\/li>\n<\/ul>\n<h4>29.\u5728Queue\u4e2dpoll()\u548cremove()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>\u76f8\u540c\u70b9\uff1a\u90fd\u662f\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u5e76\u5728\u961f\u5217\u4e2d\u5220\u9664\u8fd4\u56de\u7684\u5bf9\u8c61\u3002<\/li>\n<li>\u4e0d\u540c\u70b9\uff1a\u5982\u679c\u6ca1\u6709\u5143\u7d20poll()\u4f1a\u8fd4\u56denull\uff0c\u800cremove()\u4f1a\u76f4\u63a5\u629b\u51faNoSuchElementException\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<h4>30.\u54ea\u4e9b\u96c6\u5408\u7c7b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff1f<\/h4>\n<p>Vector\u3001Hashtable\u3001Stack\u90fd\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c\u50cfHashMap\u5219\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e0d\u8fc7\u5728JDK1.5\u4e4b\u540e\u968f\u7740Java.util.concurrent\u5e76\u53d1\u5305\u7684\u51fa\u73b0\uff0c\u5b83\u4eec\u4e5f\u6709\u4e86\u81ea\u5df1\u5bf9\u5e94\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\uff0c\u6bd4\u5982HashMap\u5bf9\u5e94\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\u5c31\u662fConcurrentHashMap\u3002<\/p>\n<h4>31.\u8fed\u4ee3\u5668Iterator\u7684\u4ec0\u4e48\uff1f<\/h4>\n<p>Iterator\u63a5\u53e3\u63d0\u4f9b\u904d\u5386\u4efb\u4f55Collection\u7684\u63a5\u53e3\u3002\u6211\u4eec\u53ef\u4ee5\u4ece\u4e00\u4e2aCollection\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u65b9\u6cd5\u6765\u83b7\u53d6\u8fed\u4ee3\u5668\u5b9e\u4f8b\u3002\u8fed\u4ee3\u5668\u53d6\u4ee3\u4e86Java\u96c6\u5408\u6846\u67b6\u4e2d\u7684Enumeration\uff0c\u8fed\u4ee3\u5668\u5141\u8bb8\u8c03\u7528\u8005\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u79fb\u9664\u5143\u7d20\u3002<\/p>\n<h4>32.Iterator\u600e\u4e48\u4f7f\u7528\uff1f\u6709\u4ec0\u4e48\u7279\u70b9\uff1f<\/h4>\n<p>Iterator\u4f7f\u7528\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-java\">List&lt;String&gt; list =new ArrayList&lt;&gt;();\nIterator&lt;String&gt; it=list.iterator();\nwhile(it.hasNext()){\n    String obj=it.next();\n    System.out.println(obj);\n}\n<\/code><\/pre>\n<p>Iterator\u7684\u7279\u70b9\u662f\u66f4\u5b89\u5168\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u786e\u4fdd\uff0c\u5728\u5f53\u524d\u904d\u5386\u7684\u96c6\u5408\u5143\u7d20\u88ab\u66f4\u6539\u65f6\uff0c\u4f1a\u629b\u51faConcurrentModificationException\u5f02\u5e38\u3002<\/p>\n<h4>33.Iterator\u548cListIterator\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>Iterator\u53ef\u4ee5\u904d\u5386Set\u548cList\u96c6\u5408\uff0c\u800cListIterator\u53ea\u80fd\u904d\u5386List\u3002<\/li>\n<li>Iterator\u53ea\u80fd\u5355\u5411\u904d\u5386\uff0c\u800cListIterator\u53ef\u4ee5\u53cc\u5411\u904d\u5386\u3002<\/li>\n<li>ListIterator\u4eceIterator\u63a5\u53e3\u7ee7\u627f\uff0c\u7136\u540e\u6dfb\u52a0\u4e86\u4e00\u4e9b\u989d\u5916\u7684\u529f\u80fd\uff0c\u6bd4\u5982\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\u3001\u66ff\u6362\u5143\u7d20\u3001\u83b7\u53d6\u524d\u540e\u5143\u7d20\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n<h4>34.\u600e\u4e48\u786e\u4fdd\u4e00\u4e2a\u96c6\u5408\u4e0d\u80fd\u88ab\u4fee\u6539\uff1f<\/h4>\n<p>\u53ef\u4ee5\u4f7f\u7528Collections.unmodifiableCollection(Collection c) \u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u53ea\u8bfb\u96c6\u5408\uff0c\u8fd9\u6837\u6539\u53d8\u96c6\u5408\u7684\u4efb\u4f55\u64cd\u4f5c\u90fd\u4f1a\u629b\u51faJava.lang.UnsupportedOperationException\u5f02\u5e38\u3002\u5982\uff1a<\/p>\n<pre><code class=\"language-java\">List&lt;String&gt; list=new ArrayList&lt;&gt;();\nlist.add(&quot;x&quot;);\nCollection&lt;String&gt; clist=Collections.unmodifiableCollection(list);\nclist.add(&quot;y&quot;);\/\/\u62a5\u9519\n<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h4>35.\u5e76\u884c\u548c\u5e76\u53d1\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>\u5e76\u884c\uff1a\u591a\u4e2a\u5904\u7406\u5668\u6216\u591a\u6838\u5904\u7406\u5668\u540c\u65f6\u5904\u7406\u591a\u4e2a\u4efb\u52a1\u3002<\/li>\n<li>\u5e76\u53d1\uff1a\u591a\u4e2a\u4efb\u52a1\u5728\u540c\u4e00\u4e2aCPU\u6838\u4e0a\uff0c\u6309\u7ec6\u5206\u7684\u65f6\u95f4\u7247\u8f6e\u6d41\u6267\u884c\uff0c\u4ece\u903b\u8f91\u4e0a\u6765\u770b\u90a3\u4e9b\u4efb\u52a1\u662f\u540c\u65f6\u6267\u884c\u3002<\/li>\n<\/ul>\n<h4>36.\u7ebf\u7a0b\u548c\u8fdb\u7a0b\u7684\u533a\u522b\uff1f<\/h4>\n<p>\u4e00\u4e2a\u7a0b\u5e8f\u4e0b\u81f3\u5c11\u6709\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0b\u81f3\u5c11\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0b\u4e5f\u53ef\u4ee5\u6709\u591a\u4e2a\u7ebf\u7a0b\u6765\u589e\u52a0\u7a0b\u5e8f\u7684\u6267\u884c\u901f\u5ea6\u3002\n\u8fdb\u7a0b\u662f\u8d44\u6e90\u5206\u914d\u7684\u6700\u5c0f\u5355\u4f4d\uff0c\u7ebf\u7a0b\u662fCpu\u8c03\u5ea6\u7684\u6700\u5c0f\u5355\u4f4d<\/p>\n<h4>37.\u5b88\u62a4\u7ebf\u7a0b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<p>\u5b88\u62a4\u8fdb\u7a0b\u662f\u8fd0\u884c\u5728\u540e\u53f0\u7684\u4e00\u79cd\u7279\u6b8a\u8fdb\u7a0b\u3002\u5b83\u72ec\u7acb\u4e8e\u63a7\u5236\u7ec8\u7aef\u5e76\u4e14\u5468\u671f\u6027\u5730\u6267\u884c\u67d0\u79cd\u4efb\u52a1\u6216\u7b49\u5f85\u5904\u7406\u67d0\u79cd\u53d1\u751f\u7684\u4e8b\u4ef6\u3002<\/p>\n<h4>38.\u521b\u5efa\u7ebf\u7a0b\u7684\u51e0\u79cd\u65b9\u6cd5<\/h4>\n<ol>\n<li>\u7ee7\u627fThread\u91cd\u5199run\u65b9\u6cd5\n2.\u5b9e\u73b0Runnable\u63a5\u53e3\n3.\u5b9e\u73b0Callable\u63a5\u53e3<\/li>\n<\/ol>\n<h4>39.\u8bf4\u4e00\u4e0brunnable\u548ccallable\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<p>runnable\u6ca1\u6709\u8fd4\u56de\u503c\uff0ccallable\u53ef\u4ee5\u62ff\u5230\u8fd4\u56de\u503c\uff0ccallable\u53ef\u4ee5\u770b\u505a\u662frunnable\u7684\u8865\u5145\u3002<\/p>\n<h4>40.\u7ebf\u7a0b\u6709\u54ea\u4e9b\u72b6\u6001\uff1f<\/h4>\n<p>\u7ebf\u7a0b\u7684\u72b6\u6001\uff1a<\/p>\n<ul>\n<li>NEW \u5c1a\u672a\u542f\u52a8<\/li>\n<li>RUNNABLE \u6b63\u5728\u6267\u884c\u4e2d<\/li>\n<li>BLOCKED \u963b\u585e\u7684(\u88ab\u540c\u6b65\u9501\u6216\u8005IO\u9501\u963b\u585e)<\/li>\n<li>WAITING \u6c38\u4e45\u7b49\u5f85\u72b6\u6001<\/li>\n<li>TIMED_WAITING \u7b49\u5f85\u6307\u5b9a\u7684\u65f6\u95f4\u91cd\u5199\u88ab\u5524\u9192\u7684\u72b6\u6001<\/li>\n<li>TERMINATED \u6267\u884c\u5b8c\u6210<\/li>\n<\/ul>\n<h4>41.sleep()\u548cwait()\u65b9\u6cd5\u7684\u533a\u522b<\/h4>\n<ul>\n<li>\u7c7b\u7684\u4e0d\u540c\uff1asleep()\u6765\u81eaThread\u7c7b\uff0cwait()\u6765\u81eaObject<\/li>\n<li>\u91ca\u653e\u9501\uff1asleep()\u4e0d\u91ca\u653e\u9501\uff0cwait()\u91ca\u653e\u9501<\/li>\n<li>\u7528\u6cd5\u4e0d\u540c\uff1asleep()\u65f6\u95f4\u5230\u81ea\u52a8\u5524\u9192\uff0cwait()\u53ea\u80fd\u7528notify()\/notifyAll()\u6765\u5524\u9192<\/li>\n<\/ul>\n<h4>42.notify()\u548cnotifyAll()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<p>notifyAll()\u4f1a\u5524\u9192\u6240\u6709\u7ebf\u7a0b\uff0c\u8ba9\u6240\u6709\u7ebf\u7a0b\u53bb\u4e89\u62a2\u9501\uff0cnotify()\u4e4b\u540e\u4f1a\u968f\u673a\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u8ba9\u5b83\u81ea\u5df1\u53bb\u4e89\u62a2\u9501\u3002\n\u6240\u6709\u672c\u8d28\u5728\u5e94\u7528\u4e0a\uff0c\u4e24\u8005\u7684\u4f7f\u7528\u662f\u4e00\u6837\u7684\uff0c\u4f46\u7531\u4e8e\u4f7f\u7528notify()\u662f\u968f\u673a\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5b58\u5728\u67d0\u4e00\u7ebf\u7a0b\u59cb\u7ec8\u4e0d\u88ab\u5524\u9192\u7684\u60c5\u51b5\uff0c\u56e0\u6b64\u4e00\u534a\u4f7f\u7528notifyAll()\u6765\u8ba9\u7ebf\u7a0b\u81ea\u5df1\u4e89\u593a\u3002<\/p>\n<h4>43.\u7ebf\u7a0b\u7684run()\u548cstart()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<p>start()\u65b9\u6cd5\u7528\u4e8e\u542f\u52a8\u7ebf\u7a0b\uff0crun()\u65b9\u6cd5\u7528\u4e8e\u6267\u884c\u7ebf\u7a0b\u7684\u8fd0\u884c\u65f6\u4ee3\u7801\u3002run()\u53ef\u4ee5\u91cd\u590d\u8c03\u7528\uff0c\u800cstart()\u53ea\u80fd\u8c03\u7528\u4e00\u6b21\u3002<\/p>\n<h4>44.\u521b\u5efa\u7ebf\u7a0b\u6c60\u6709\u54ea\u51e0\u79cd\u65b9\u5f0f\uff1f<\/h4>\n<ul>\n<li>newSingleThreadExecutor():\u7279\u70b9\u662f\u5de5\u4f5c\u7ebf\u7a0b\u6570\u76ee\u88ab\u9650\u5236\u4e3a1\uff0c\u64cd\u4f5c\u4e00\u4e2a\u65e0\u754c\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u6240\u4ee5\u5b83\u4fdd\u8bc1\u4e86\u6240\u6709\u4efb\u52a1\u90fd\u662f\u88ab\u987a\u5e8f\u6267\u884c\uff0c\u6700\u591a\u4f1a\u6709\u4e00\u4e2a\u4efb\u52a1\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\uff0c\u5e76\u4e14\u4e0d\u5141\u8bb8\u662f\u4e00\u79cd\u6539\u52a8\u7ebf\u7a0b\u6c60\u5b9e\u529b\uff0c\u56e0\u6b64\u53ef\u4ee5\u907f\u514d\u5176\u6539\u53d8\u7ebf\u7a0b\u6570\u76ee\uff1b<\/li>\n<li>newCachedThreadPool():\u5b83\u662f\u4e00\u79cd\u7528\u6765\u5904\u7406\u5927\u91cf\u77ed\u65f6\u95f4\u5de5\u4f5c\u4efb\u52a1\u7684\u7ebf\u7a0b\u6c60\uff0c\u5177\u6709\u51e0\u4e2a\u9c9c\u660e\u7279\u70b9\uff1a\u5b83\u4f1a\u8bd5\u56fe\u7f13\u5b58\u7ebf\u7a0b\u5e76\u91cd\u7528\uff0c\u5f53\u65e0\u7f13\u5b58\u7ebf\u7a0b\u53ef\u7528\u65f6\uff0c\u5c31\u4f1a\u521b\u5efa\u65b0\u7684\u7ebf\u7a0b\uff1b\u5982\u679c\u7ebf\u7a0b\u95f2\u7f6e\u65f6\u95f4\u8d85\u8fc760\u79d2\uff0c\u5219\u88ab\u7ec8\u6b62\u5e76\u79fb\u51fa\u7f13\u5b58\uff1b\u957f\u65f6\u95f4\u95f2\u7f6e\u65f6\uff0c\u8fd9\u79cd\u7ebf\u7a0b\u6c60\uff0c\u4e0d\u4f1a\u6d88\u8017\u4ec0\u4e48\u8d44\u6e90\u3002\u5176\u5185\u90e8\u4f7f\u7528SynchronousQueue\u4f5c\u4e3a\u5de5\u4f5c\u961f\u5217\u3002<\/li>\n<li>newFixedThreadPool():\u91cd\u7528\u6307\u5b9a\u6570\u76ee\uff08nThreads\uff09\u7684\u7ebf\u7a0b\uff0c\u5176\u80cc\u540e\u4f7f\u7528\u7684\u662f\u65e0\u754c\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u4efb\u4f55\u65f6\u5019\u6700\u591a\u6709nThread\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u662f\u6d3b\u52a8\u7684\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4efb\u52a1\u6570\u91cf\u8d85\u8fc7\u4e86\u6d3b\u52a8\u961f\u5217\u7684\u6570\u76ee\uff0c\u5c06\u5728\u5de5\u4f5c\u961f\u5217\u4e2d\u7b49\u5f85\u7a7a\u95f2\u7ebf\u7a0b\u51fa\u73b0\uff1b\u5982\u679c\u6709\u5de5\u4f5c\u7ebf\u7a0b\u9000\u51fa\uff0c\u5c06\u4f1a\u6709\u65b0\u7684\u5de5\u4f5c\u7ebf\u7a0b\u88ab\u521b\u5efa\uff0c\u4ee5\u8865\u8db3nThreads\u3002<\/li>\n<li>newSingleThreadScheduledExecutor():\u521b\u5efa\u5355\u7ebf\u7a0b\u6c60\uff0c\u8fd4\u56deScheduledExecutorService\uff0c\u53ef\u4ee5\u8fdb\u884c\u5b9a\u65f6\u6216\u5468\u671f\u6027\u7684\u5de5\u4f5c\u8c03\u5ea6\u3002<\/li>\n<li>newScheduledThreadPool(int corePoolSize):\u548cnewSingleThreadScheduledExecutor()\u7c7b\u4f3c\uff0c\u521b\u5efa\u7684\u662f\u4e00\u4e2aScheduledExecutorService\uff0c\u53ef\u4ee5\u8fdb\u884c\u5b9a\u65f6\u6216\u5468\u671f\u6027\u7684\u5de5\u4f5c\u8c03\u5ea6\uff0c\u533a\u522b\u5728\u4e8e\u5355\u4e00\u5de5\u4f5c\u7ebf\u7a0b\u8fd8\u662f\u591a\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u3002<\/li>\n<li>newWorkStealingPool(int parallelism)\uff1ajava 8 \u52a0\u5165\u7684\u521b\u5efa\u65b9\u6cd5\uff0c\u5185\u90e8\u4f1a\u6784\u5efaForkJoinPool\uff0c\u5229\u7528Work-Stealing\u7b97\u6cd5\uff0c\u5e76\u884c\u5730\u5904\u7406\u4efb\u52a1\uff0c\u4e0d\u4fdd\u8bc1\u5904\u7406\u987a\u5e8f\u3002\nThreadPoolExecutor()\uff1a\u662f\u6700\u539f\u59cb\u7684\u7ebf\u7a0b\u6c60\u521b\u5efa\u3002<\/li>\n<\/ul>\n<h3>45.\u7ebf\u7a0b\u6c60\u90fd\u6709\u54ea\u4e9b\u72b6\u6001\uff1f<\/h3>\n<ul>\n<li>RUNNING\uff1a\u8fd9\u662f\u6700\u6b63\u5e38\u7684\u72b6\u6001\uff0c\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\uff0c\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/li>\n<li>SHUTDOWN\uff1a\u4e0d\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u4e0d\u518d\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u4e2d\u65ad\u6b63\u5728\u6267\u884c\u4efb\u52a1\u7684\u7ebf\u7a0b\u3002<\/li>\n<li>STOP\uff1a\u4e0d\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u4e0d\u518d\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u4e2d\u65ad\u6b63\u5728\u6267\u884c\u4efb\u52a1\u7684\u7ebf\u7a0b\u3002<\/li>\n<li>TIDYING\uff1a\u6240\u6709\u7684\u4efb\u52a1\u90fd\u9500\u6bc1\u4e86\uff0cworkCount\u4e3a0\uff0c\u7ebf\u7a0b\u6c60\u7684\u72b6\u6001\u8f6c\u6362\u4e3aTIDYING\u72b6\u6001\u65f6\uff0c\u4f1a\u6267\u884c\u94a9\u5b50\u65b9\u6cd5terminated()<\/li>\n<li>TERMINATED:terminated()\u65b9\u6cd5\u7ed3\u675f\u540e\uff0c\u7ebf\u7a0b\u6c60\u72b6\u6001\u4f1a\u53d8\u4e3a\u6b64\u72b6\u6001\u3002<\/li>\n<\/ul>\n<h4>46.\u7ebf\u7a0b\u6c60\u4e2dsubmit()\u548cexecute()\u65b9\u6cd5\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>execute()\uff1a\u53ea\u80fd\u6267\u884cRunnable\u7c7b\u578b\u7684\u4efb\u52a1<\/li>\n<li>submit()\uff1a\u53ef\u4ee5\u6267\u884cRunnable\u548cCallable\u7c7b\u578b\u7684\u4efb\u52a1\u3002<\/li>\n<\/ul>\n<h4>47.\u5728Java\u7a0b\u5e8f\u4e2d\u600e\u4e48\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u7684\u8fd0\u884c\u5b89\u5168\uff1f<\/h4>\n<ol>\n<li>\u4f7f\u7528\u5b89\u5168\u7c7b\uff0c\u6bd4\u5982java.util.concurrent\u4e0b\u7684\u7c7b<\/li>\n<li>\u4f7f\u7528\u81ea\u52a8\u9501synchronized\u3002<\/li>\n<li>\u4f7f\u7528\u624b\u52a8\u9501Lock\u3002<\/li>\n<\/ol>\n<h4>48.\u4ec0\u4e48\u662f\u6b7b\u9501<\/h4>\n<p>\u5f53\u7ebf\u7a0bA\u6301\u6709\u72ec\u5360\u9501a\uff0c\u5e76\u5c1d\u8bd5\u53bb\u83b7\u53d6\u72ec\u5360\u9501b\u7684\u540c\u65f6\uff0c\u7ebf\u7a0bB\u6301\u6709\u72ec\u5360\u9501b\uff0c\u5e76\u5c1d\u8bd5\u83b7\u53d6\u72ec\u5360\u9501a\u7684\u60c5\u51b5\u4e0b\uff0c\u5c31\u4f1a\u53d1\u751fAB\u4e24\u4e2a\u9501\u7531\u4e8e\u4e92\u76f8\u6301\u6709\u5bf9\u65b9\u9700\u8981\u7684\u9501\uff0c\u800c\u53d1\u751f\u963b\u585e\u7684\u73b0\u8c61\uff0c\u6211\u4eec\u79f0\u4e4b\u6b7b\u9501\u3002<\/p>\n<h4>49.\u6b7b\u9501\u7684\u6761\u4ef6<\/h4>\n<ol>\n<li>\u4e92\u65a5\u539f\u5219\uff1a\u540c\u4e00\u8d44\u6e90\u540c\u65f6\u53ea\u80fd\u7531\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u53d6<\/li>\n<li>\u4e0d\u53ef\u62a2\u5360\uff1a\u4e0d\u53ef\u4ee5\u5f3a\u884c\u5265\u593a\u7ebf\u7a0b\u62a2\u5360\u7684\u8d44\u6e90<\/li>\n<li>\u8bf7\u6c42\u548c\u4fdd\u6301\uff1a\u7ebf\u7a0b\u5728\u8bf7\u6c42\u5176\u4ed6\u8d44\u6e90\u65f6\uff0c\u5bf9\u6301\u6709\u8d44\u6e90\u4fdd\u6301\u4e0d\u653e<\/li>\n<li>\u5faa\u73af\u7b49\u5f85\u6761\u4ef6\uff1a\u5728\u4e92\u76f8\u7b49\u5f85\u8d44\u6e90\u4e2d\uff0c\u5f62\u6210\u95ed\u73af<\/li>\n<\/ol>\n<h4>50.\u600e\u4e48\u9632\u6b62\u6b7b\u9501<\/h4>\n<ul>\n<li>\u5c3d\u91cf\u4f7f\u7528\u4f7f\u7528tryLock\u7684\u65b9\u6cd5\uff0c\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\uff0c\u8d85\u65f6\u53ef\u4ee5\u9000\u51fa\u9632\u6b62\u6b7b\u9501\u3002<\/li>\n<li>\u5c3d\u91cf\u4f7f\u7528Java.util.concurrent\u7c7b\u6765\u4ee3\u66ff\u81ea\u5df1\u7684\u624b\u5199\u9501<\/li>\n<li>\u5c3d\u91cf\u964d\u4f4e\u9501\u7684\u4f7f\u7528\u7c92\u5ea6\uff0c\u5c3d\u91cf\u4e0d\u8981\u51e0\u4e2a\u529f\u80fd\u7528\u540c\u4e00\u628a\u9501<\/li>\n<li>\u5c3d\u91cf\u51cf\u5c11\u540c\u6b65\u7684\u4ee3\u7801\u5757<\/li>\n<\/ul>\n<h4>51.ThreadLocal\u662f\u4ec0\u4e48\uff1f\u6709\u54ea\u4e9b\u4f7f\u7528\u573a\u666f\uff1f<\/h4>\n<p>ThreadLocal\u4e3a\u6bcf\u4e2a\u4f7f\u7528\u8be5\u53d8\u91cf\u7684\u7ebf\u7a0b\u63d0\u4f9b\u72ec\u7acb\u7684\u53d8\u91cf\u526f\u672c\uff0c\u6240\u4ee5\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u72ec\u7acb\u5730\u6539\u53d8\u81ea\u5df1\u7684\u526f\u672c\uff0c\u800c\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u7ebf\u7a0b\u6240\u5bf9\u5e94\u7684\u526f\u672c\u3002\nThreadLocal\u7684\u7ecf\u5178\u4f7f\u7528\u573a\u666f\u662f\u6570\u636e\u5e93\u8fde\u63a5\u548csession\u7ba1\u7406\u7b49\u3002<\/p>\n<h4>52.\u8bf4\u4e00\u4e0bsynchronized\u5e95\u5c42\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n<p>synchronized\u662f\u7531\u4e00\u5bf9monitorenter\/monitorexit\u6307\u4ee4\u5b9e\u73b0\u7684\uff0cmonitor\u5bf9\u8c61\u662f\u540c\u6b65\u7684\u57fa\u672c\u5b9e\u73b0\u5355\u4f4d\uff0c\u5728java6\u4e4b\u524d\uff0cmonitor\u7684\u5b9e\u73b0\u5b8c\u5168\u4f9d\u9760\u64cd\u4f5c\u7cfb\u7edf\u5185\u90e8\u7684\u4e92\u65a5\u9501\uff0c\u56e0\u4e3a\u9700\u8981\u8fdb\u884c\u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u5207\u6362\uff0c\u6240\u4ee5\u540c\u6b65\u64cd\u4f5c\u662f\u4e00\u4e2a\u65e0\u5dee\u522b\u7684\u91cd\u91cf\u7ea7\u64cd\u4f5c\uff0c\u6027\u80fd\u4e5f\u5f88\u4f4e\u3002\u4f46\u5728Java6\u7684\u65f6\u5019\uff0c\u865a\u62df\u673a\u5bf9\u6b64\u8fdb\u884c\u4e86\u6539\u8fdb\uff0c\u63d0\u4f9b\u4e86\u4e09\u79cd\u4e0d\u540c\u7684monitor\u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u5e38\u8bf4\u7684\u4e09\u79cd\u4e0d\u540c\u7684\u9501\uff1a\u504f\u5411\u9501\u3001\u8f7b\u91cf\u7ea7\u9501\u3001\u91cd\u91cf\u7ea7\u9501\uff0c\u5927\u5927\u6539\u8fdb\u4e86\u5176\u6027\u80fd\u3002<\/p>\n<h4>53.synchronized\u548cvolatile\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<ul>\n<li>volatile\u662f\u53d8\u91cf\u4fee\u9970\u7b26\uff0csynchronized\u662f\u4fee\u9970\u7c7b\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u6bb5\u3002<\/li>\n<li>volatile\u4ec5\u80fd\u5b9e\u73b0\u53d8\u91cf\u7684\u4fee\u6539\u53ef\u89c1\u6027\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027\uff1b\u800csynchronized\u5219\u53ef\u4ee5\u4fdd\u8bc1\u53d8\u91cf\u7684\u4fee\u6539\u53ef\u89c1\u6027\u548c\u539f\u5b50\u6027\u3002<\/li>\n<li>volition\u4e0d\u4f1a\u9020\u6210\u7ebf\u7a0b\u7684\u963b\u585e\uff0csynchronized\u53ef\u80fd\u4f1a\u9020\u6210\u7ebf\u7a0b\u7684\u963b\u585e\u3002<\/li>\n<\/ul>\n<h4>54.synchronized\u548cLock\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>synchronized\u53ef\u4ee5\u7ed9\u7c7b\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u52a0\u9501\uff1b\u800clock\u53ea\u80fd\u7ed9\u4ee3\u7801\u5757\u52a0\u9501\u3002<\/li>\n<li>synchronized\u4e0d\u9700\u8981\u624b\u52a8\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\uff0c\u4f7f\u7528\u7b80\u5355\uff0c\u53d1\u751f\u5f02\u5e38\u4f1a\u81ea\u52a8\u91ca\u653e\u9501\uff0c\u4e0d\u4f1a\u9020\u6210\u6b7b\u9501\uff1b\u800clock\u9700\u8981\u81ea\u5df1\u52a0\u9501\u548c\u91ca\u653e\u9501\uff0c\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\u6ca1\u6709\u91ca\u653e\uff0c\u4f1a\u9020\u6210\u6b7b\u9501\u3002<\/li>\n<li>\u63d0\u4f9bLock\u53ef\u4ee5\u77e5\u9053\u6709\u6ca1\u6709\u6210\u529f\u83b7\u53d6\u5230\u9501\uff0c\u800csynchronized\u65e0\u6cd5\u529e\u5230\u3002<\/li>\n<\/ul>\n<h4>55.synchronized\u548cReentrantLock\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<p>synchronized\u65e9\u671f\u7684\u5b9e\u73b0\u6bd4\u8f83\u4f4e\u6548\uff0c\u5bf9\u6bd4ReentrantLock\uff0c\u5927\u591a\u6570\u573a\u666f\u6027\u80fd\u90fd\u76f8\u5dee\u8f83\u5927\uff0c\u4f46\u662f\u5728Java6\u4e2d\u5bf9synchronized\u8fdb\u884c\u4e86\u975e\u5e38\u591a\u7684\u6539\u8fdb\u3002\n\u4e3b\u8981\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>ReentrantLock \u4f7f\u7528\u8d77\u6765\u6bd4\u8f83\u7075\u6d3b\uff0c\u4f46\u5fc5\u987b\u6709\u91ca\u653e\u9501\u7684\u914d\u5408\u52a8\u4f5c\u3002<\/li>\n<li>ReentrantLock\u5fc5\u987b\u624b\u52a8\u83b7\u53d6\u4e0e\u91ca\u653e\u9501\uff0c\u800csynchronized\u4e0d\u9700\u8981\u624b\u52a8\u91ca\u653e\u548c\u5f00\u542f\u9501\u3002<\/li>\n<li>ReentrantLock \u53ea\u9002\u5408\u4e8e\u4ee3\u7801\u5757\u9501\uff0c\u800csynchronized\u53ef\u7528\u4e8e\u88c5\u9970\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u7b49\u3002<\/li>\n<\/ul>\n<h4>56.\u8bf4\u4e00\u4e0batomic\u7684\u539f\u7406\uff1f<\/h4>\n<p>atomic\u4e3b\u8981\u5229\u7528CAS\u548cvolatile\u548cnative\u65b9\u6cd5\u6765\u4fdd\u8bc1\u539f\u5b50\u64cd\u4f5c\uff0c\u4ece\u800c\u907f\u514dsynchronized\u7684\u9ad8\u5f00\u9500\uff0c\u6267\u884c\u6548\u7387\u5927\u4e3a\u63d0\u5347\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h3>\u53cd\u5c04<\/h3>\n<h4>57.\u4ec0\u4e48\u662f\u53cd\u5c04<\/h4>\n<p>\u53cd\u5c04\u662f\u5728\u8fd0\u884c\u4e2d\u7684\u7684\u72b6\u6001\uff0c\u5bf9\u4e8e\u4efb\u610f\u7c7b\uff0c\u90fd\u80fd\u591f\u77e5\u9053\u8fd9\u4e2a\u7c7b\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff1b\u5bf9\u4e8e\u4efb\u610f\u5bf9\u8c61\uff0c\u90fd\u80fd\u591f\u8c03\u7528\u5b83\u7684\u4efb\u610f\u4e00\u4e2a\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u8fd9\u79cd\u52a8\u6001\u83b7\u53d6\u7684\u4fe1\u606f\u4ee5\u53ca\u52a8\u6001\u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5\u7684\u529f\u80fd\u79f0\u4e4b\u4e3a\u53cd\u5c04\u673a\u5236\u3002<\/p>\n<h4>58.\u4ec0\u4e48\u662fJava\u5e8f\u5217\u5316\uff0c\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u5e8f\u5217\u5316\uff1f<\/h4>\n<p>java\u5e8f\u5217\u5316\u662f\u4e3a\u4e86\u4fdd\u5b58\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u80fd\u591f\u628a\u8fd9\u4e2a\u72b6\u6001\u518d\u8bfb\u51fa\u6765\u3002\n\u9700\u8981\u5e8f\u5217\u5316\u7684\u573a\u666f<\/p>\n<ol>\n<li>\u60f3\u628a\u5185\u5b58\u4e2d\u5bf9\u8c61\u7684\u72b6\u6001\u4fdd\u5b58\u81f3\u6587\u4ef6\u6216\u6570\u636e\u5e93\u4e2d\u3002<\/li>\n<li>\u60f3\u901a\u8fc7\u5957\u63a5\u5b57\u5728\u7f51\u7edc\u4e0a\u4f20\u9012\u5bf9\u8c61\u3002<\/li>\n<li>\u7bb1\u901a\u8fc7RMI\u4f20\u8f93\u5bf9\u8c61<\/li>\n<\/ol>\n<h4>59.\u52a8\u6001\u4ee3\u7406\u662f\u4ec0\u4e48\uff1f\u6709\u54ea\u4e9b\u5e94\u7528\uff1f<\/h4>\n<p>\u52a8\u6001\u4ee3\u7406\u662f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b\n\u52a8\u6001\u4ee3\u7406\u7684\u5e94\u7528\u6709spring aop\uff0c\u6d4b\u8bd5\u6846\u67b6\u7684\u540e\u7aefmock\u3001rpc\u3001Java\u6ce8\u89e3\u5bf9\u8c61\u83b7\u53d6\u7b49\u3002<\/p>\n<h4>60.\u600e\u4e48\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406<\/h4>\n<p>JDK\u539f\u751f\u52a8\u6001\u4ee3\u7406\u548ccglib\u52a8\u6001\u4ee3\u7406\u3002JDK\u539f\u751f\u52a8\u6001\u4ee3\u7406\u662f\u57fa\u4e8e\u63a5\u53e3\u5b9e\u73b0\u7684\uff0c\u800ccglib\u662f\u57fa\u4e8e\u7ee7\u627f\u5f53\u524d\u7c7b\u7684\u5b50\u7c7b\u5b9e\u73b0\u7684\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h4>61.\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u514b\u9686<\/h4>\n<p>\u514b\u9686\u7684\u5bf9\u8c61\u53ef\u80fd\u5305\u542b\u4e00\u4e9b\u5df2\u7ecf\u4fee\u6539\u8fc7\u7684\u5c5e\u6027\uff0c\u800cnew\u51fa\u6765\u7684\u5bf9\u8c61\u7684\u5c5e\u6027\u90fd\u8fd8\u662f\u521d\u59cb\u5316\u65f6\u5019\u7684\u503c\uff0c\u6240\u4ee5\u5f53\u9700\u8981\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u6765\u4fdd\u5b58\u5f53\u524d\u5bf9\u8c61\u7684\u201c\u72b6\u6001\u201d\u5c31\u9700\u8981\u514b\u9686\u4e86\u3002<\/p>\n<h4>62.\u5982\u4f55\u5b9e\u73b0\u5bf9\u8c61\u514b\u9686\uff1f<\/h4>\n<ul>\n<li>\u5b9e\u73b0Cloneable\u63a5\u53e3\u5e76\u91cd\u5199Object\u7c7b\u7684clone()\u65b9\u6cd5\u3002<\/li>\n<li>\u5b9e\u73b0Serializable\u63a5\u53e3\uff0c\u901a\u8fc7\u5bf9\u8c61\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u5b9e\u73b0\u514b\u9686\uff0c\u53ef\u4ee5\u5b9e\u73b0\u771f\u6b63\u7684\u6df1\u5ea6\u514b\u9686\u3002<\/li>\n<\/ul>\n<h4>63.\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n<ul>\n<li>\u6d45\u62f7\u8d1d\uff1a\u5f53\u5bf9\u8c61\u88ab\u590d\u5236\u65f6\u53ea\u590d\u5236\u5b83\u672c\u8eab\u548c\u5176\u4e2d\u5305\u542b\u7684\u503c\u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\uff0c\u800c\u5f15\u7528\u7c7b\u578b\u7684\u6210\u5458\u5bf9\u8c61\u5e76\u6ca1\u6709\u590d\u5236\u3002<\/li>\n<li>\u6df1\u62f7\u8d1d\uff1a\u9664\u4e86\u590d\u5236\u5bf9\u8c61\u672c\u8eab\u5916\uff0c\u5bf9\u8c61\u6240\u5305\u542b\u7684\u6240\u6709\u6210\u5458\u53d8\u91cf\u4e5f\u5c06\u590d\u5236\u3002<\/li>\n<\/ul>\n<h3>Java Web<\/h3>\n<h4>64.JSP\u548cservlet\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<p>JSP\u662fservlet\u6280\u672f\u7684\u62d3\u5c55\uff0c\u672c\u8d28\u4e0a\u662fservlet\u7684\u7b80\u6613\u65b9\u5f0f\u3002<\/p>\n<h4>65.session\u548ccookie\u5728\u533a\u522b<\/h4>\n<ul>\n<li>\u5b58\u50a8\u4f4d\u7f6e\u4e0d\u540c\uff1asession\u5b58\u50a8\u5728\u670d\u52a1\u5668\u7aef\uff0ccookie\u5b58\u50a8\u5728\u6d4f\u89c8\u5668<\/li>\n<li>\u5b89\u5168\u6027\u4e0d\u540c\uff1acookie\u5b89\u5168\u6027\u4e00\u822c\uff0c\u53ef\u4ee5\u88ab\u7be1\u6539\u548c\u4f2a\u9020<\/li>\n<li>\u5bb9\u91cf\u548c\u4e2a\u6570\u9650\u5236\uff1acookie\u5b58\u5728\u5bb9\u91cf\u9650\u5236\uff0c\u540c\u4e00\u7ad9\u70b9\u4e0b\u7684cookie\u4e5f\u6709\u4e2a\u6570\u9650\u5236<\/li>\n<li>\u5b58\u50a8\u591a\u6837\u6027\uff1acookie\u53ea\u80fd\u5b58\u50a8\u5728\u6d4f\u89c8\u5668\uff0csession\u53ef\u4ee5\u5b58\u50a8\u5728Redis\uff0c\u6570\u636e\u5e93\u7b49<\/li>\n<\/ul>\n<h4>66.session\u7684\u5de5\u4f5c\u539f\u7406<\/h4>\n<p>session\u5de5\u4f5c\u539f\u7406\u662f\u5ba2\u6237\u7aef\u767b\u5f55\u5b8c\u6210\u540e\uff0c\u670d\u52a1\u5668\u4f1a\u521b\u5efa\u5bf9\u5e94\u7684session\uff0c\u521b\u5efa\u4e4b\u540e\u4f1a\u5c06session\u7684id\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u518d\u5b58\u50a8\u5230\u6d4f\u89c8\u5668\u3002\u8fd9\u6837\u6bcf\u6b21\u5411\u670d\u52a1\u5668\u8bf7\u6c42\u65f6\u90fd\u4f1a\u5e26\u7740sessionid\uff0c\u670d\u52a1\u5668\u62ff\u5230sessionid\u4e4b\u540e\u5728\u5185\u5b58\u627e\u5230\u4e0e\u4e4b\u5bf9\u5e94\u7684session\u5373\u53ef\u3002<\/p>\n<h4>67.\u5982\u4f55\u907f\u514dSQL\u6ce8\u5165<\/h4>\n<ul>\n<li>\u4f7f\u7528\u9884\u5904\u7406PreparedStatement\u3002<\/li>\n<li>\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fc7\u6ee4\u6389\u5b57\u7b26\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<h3>\u5f02\u5e38<\/h3>\n<h4>74.throw\u548cthrows\u7684\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>throw:\u662f\u771f\u5b9e\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38<\/li>\n<li>throws:\u58f0\u660e\u53ef\u80fd\u4f1a\u629b\u51fa\u7684\u5f02\u5e38<\/li>\n<\/ul>\n<h4>75.final\u3001finally\u3001finalize\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<ul>\n<li>final:\u662f\u4fee\u9970\u7b26\uff0c\u5982\u679c\u4fee\u9970\u7c7b\uff0c\u6b64\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\uff1b\u5982\u679c\u4fee\u9970\u65b9\u6cd5\u548c\u53d8\u91cf\uff0c\u8868\u793a\u6b64\u65b9\u6cd5\u548c\u53d8\u91cf\u4e0d\u80fd\u88ab\u4fee\u6539\uff0c\u53ea\u80fd\u4f7f\u7528\u3002<\/li>\n<li>finally\uff1a\u662ftry{}catch{}finally{}\u7684\u6700\u540e\u4e00\u6b65\uff0c\u65e0\u8bba\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\uff0c\u90fd\u4f1a\u6267\u884c\u3002<\/li>\n<li>finalize:\u662fobject\u7c7b\u7684\u65b9\u6cd5\uff0c\u5728\u5783\u573e\u6536\u96c6\u5668\u6267\u884c\u7684\u65f6\u5019\u88ab\u56de\u6536\u5bf9\u8c61\u7684\u6b64\u65b9\u6cd5\u4f1a\u88ab\u8c03\u7528\u3002<\/li>\n<\/ul>\n<h4>76.try-catch-finally\u54ea\u4e2a\u90e8\u5206\u53ef\u4ee5\u7701\u7565\uff1f<\/h4>\n<p>catch\u548cfinally\u90fd\u53ef\u4ee5\u7701\u7565\uff0c\u4f46\u6700\u591a\u7701\u7565\u5176\u4e2d\u4e00\u4e2a\u3002<\/p>\n<h4>77.try-catch-finally\u3002\u5982\u679ccatch\u4e2dreturn\u4e86\uff0cfinally\u8fd8\u4f1a\u6267\u884c\u5417\uff1f<\/h4>\n<p>finally\u4e00\u5b9a\u4f1a\u6267\u884c\uff0c\u5982\u679creturn\u4e86\uff0creturn\u4f1a\u5728finally\u6267\u884c\u4e4b\u540e\u6267\u884c\u3002<\/p>\n<h4>78.\u5e38\u89c1\u7684\u5f02\u5e38\u6709\u54ea\u4e9b\uff1f<\/h4>\n<ul>\n<li>NullPointerException 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Socket\u5f02\u5e38<\/li>\n<\/ul>\n<h3>\u7f51\u7edc<\/h3>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u8be5\u6587\u7ae0\u8f6c\u81eacsdn\uff0c\u624b\u6253\u4e00\u904d\u52a0\u6df1\u8bb0\u5fc6\uff08\u72d7\u5934\uff09<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-1429","post","type-post","status-publish","format-standard","hentry","category-15"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1429"}],"collection":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/comments?post=1429"}],"version-history":[{"count":16,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1429\/revisions"}],"predecessor-version":[{"id":1458,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1429\/revisions\/1458"}],"wp:attachment":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/media?parent=1429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/categories?post=1429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/tags?post=1429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}