{"id":1430,"date":"2024-08-28T18:18:50","date_gmt":"2024-08-28T10:18:50","guid":{"rendered":"http:\/\/www.spiceandwolf.com.cn\/?p=1430"},"modified":"2024-08-28T18:18:51","modified_gmt":"2024-08-28T10:18:51","slug":"jvm-interview","status":"publish","type":"post","link":"http:\/\/www.spiceandwolf.com.cn\/index.php\/jvm-interview\/","title":{"rendered":"JVM\u57fa\u7840\u9762\u8bd5\u9898"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u5bf9\u8c61\u521b\u5efa\u6d41\u7a0b<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>Student student = new Student();<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"693\" height=\"1024\" src=\"http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/08\/image-31.png\" alt=\"\" class=\"wp-image-1431\" srcset=\"http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/08\/image-31.png 693w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/08\/image-31-203x300.png 203w\" sizes=\"auto, (max-width: 693px) 100vw, 693px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">new String(&#8220;xyz&#8221;)\u4f1a\u521b\u5efa\u51e0\u4e2a\u5bf9\u8c61<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>String s = new String(\"xyz\");<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u65f6\uff0c\u4f1a\u6309\u4e00\u4e0b\u6d41\u7a0b\u6267\u884c\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>JVM\u4f1a\u5224\u65ad\u5b57\u9762\u91cf&#8221;xyz&#8221;\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u7684stringtable\u4e2d\u662f\u5426\u80fd\u627e\u5230\u5bf9\u5e94\u7684\u8bb0\u3002\n<ul class=\"wp-block-list\">\n<li>\u6ca1\u6709\uff0c\u5219\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u521b\u5efa&#8221;xyz&#8221;\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u5e76\u5728stringtable\u4e2d\u589e\u52a0\u5bf9\u5e94\u7684\u952e\u503c\u5bf9\u6307\u5411\u5f53\u524d\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u6709\uff0c\u5219\u8fd4\u56destringtable\u5bf9\u5e94\u8bb0\u5f55\u4e2d\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u5f15\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>new String\u5bf9\u8c61\u3002new\u4f1a\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u6839\u636e\u5df2\u7ecf\u52a0\u8f7d\u7684String\u7c7b\u5728\u5806\u4e2d\u5b9e\u4f8b\u5316\u4e00\u4e2aString\u5bf9\u8c61\uff0c\u800c\u6839\u636eString\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff0c\u8be5String\u5bf9\u8c61\u540c\u6837\u4f1a\u5f15\u7528\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u5730\u5740\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u6240\u4ee5\u6709\u4e24\u79cd\u53ef\u80fd\u7ed3\u679c\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u4e4b\u524d\u5e76\u6ca1\u6709\u5bf9\u5e94\u5b57\u9762\u91cf\u7684\u5b57\u7b26\u4e32\u8bb0\u5f55\uff0c\u5219\u4f1a\u521b\u5efa\u4e24\u4e2a\u5bf9\u8c61\uff0c\u5206\u522b\u662f&#8221;abc&#8221;\u5b57\u7b26\u4e32\u5e38\u91cf\u548cString\u7c7b\u5b9e\u4f8b\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u4e4b\u524d\u5b58\u5728\u5bf9\u5e94\u5b57\u9762\u91cf\u7684\u5b57\u7b26\u4e32\uff0c\u5219\u53ea\u4f1a\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5c31\u662fString\u7c7b\u5b9e\u4f8b\u5bf9\u8c61\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u5143\u7a7a\u95f4\u6765\u66ff\u6362\u6c38\u4e45\u4ee3\uff1f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b57\u7b26\u4e32\u5b58\u5728\u6c38\u4e45\u4ee3\u4e2d\uff0c\u5bb9\u6613\u51fa\u73b0\u6027\u80fd\u95ee\u9898\u548c\u6c38\u4e45\u4ee3\u5185\u5b58\u6ea2\u51fa\u3002<\/li>\n\n\n\n<li>\u7c7b\u53ca\u65b9\u6cd5\u7684\u4fe1\u606f\u7b49\u6bd4\u8f83\u96be\u786e\u5b9a\u5176\u5927\u5c0f\uff0c\u56e0\u6b64\u5bf9\u4e8e\u6c38\u4e45\u4ee3\u7684\u5927\u5c0f\u6307\u5b9a\u6bd4\u8f83\u56f0\u96be\uff0c\u592a\u5c0f\u5bb9\u6613\u51fa\u73b0\u6c38\u4e45\u4ee3\u6ea2\u51fa\uff0c\u592a\u5927\u5219\u5bb9\u6613\u5bfc\u81f4\u8001\u5e74\u4ee3\u6ea2\u51fa\u3002<\/li>\n\n\n\n<li>\u6c38\u4e45\u4ee3\u4f1aGC\u5e26\u6765\u4e0d\u5fc5\u8981\u7684\u590d\u6742\u5ea6\uff0c\u5e76\u4e14\u56de\u6536\u6548\u7387\u4f4e\u3002<\/li>\n\n\n\n<li>Oracle\u8ba1\u5212\u5c06HotSpot\u4e0eJRockit\u5408\u4e8c\u4e3a\u4e00\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236<\/h2>\n\n\n\n<p>java\u6e90\u6587\u4ef6\u5230jvm\u4e2d\u8fd0\u884c\uff0c\u9700\u8981\u7ecf\u8fc7\u7f16\u8bd1\u548c\u7c7b\u52a0\u8f7d\u4e24\u4e2a\u8fc7\u7a0b\uff0c\u5176\u4e2d\u7c7b\u52a0\u8f7d\u9700\u8981\u7c7b\u52a0\u8f7d\u5668\u7684\u53c2\u4e0e\uff0cJVM\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u4f1a\u4ea7\u751f\u4e09\u4e2a\u7c7b\u52a0\u8f7d\u5668\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"426\" src=\"http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/image-9-1024x426.png\" alt=\"\" class=\"wp-image-1153\" srcset=\"http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/image-9-1024x426.png 1024w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/image-9-300x125.png 300w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/image-9-768x319.png 768w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/image-9-1536x639.png 1536w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/image-9-2048x852.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bootstrap ClassLoader\uff08\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\uff09\u3002\u52a0\u8f7d$JAVA_HOME\u4e2d jre\/lib\/rt.jar jre\/lib\/resource.jar\u91cc\u6240\u6709\u7684class\u6216Xbootclassoath\u9009\u9879\u7f6e\u9876\u7684jar\u5305\u3002<\/li>\n\n\n\n<li>Extension ClassLoader\uff08\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff09\u3002\u52a0\u8f7djava\u5e73\u53f0\u4e2d\u6269\u5c55\u529f\u80fd\u7684\u4e00\u4e9bjar\u5305\uff0c\u5305\u62ecjre\/ext\/*.jar\u6216 -Djava.ext.dirs\u6267\u884c\u76ee\u5f55\u4e0b\u7684jar\u5305\u3002<\/li>\n\n\n\n<li>Application ClassLoadder\uff08\u5e94\u7528\u7c7b\u52a0\u8f7d\u5668\uff09\u3002\u52a0\u8f7dclasspath\u4e2d\u6307\u5b9a\u7684jar\u5305\u53caDjava.class.path\u9501\u5236\u5b9a\u76ee\u5f55\u4e0b\u7684\u7c7b\u548cjar\u5305\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u903b\u8f91\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"574\" src=\"http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/\u622a\u5c4f2024-07-12-17.38.18-1024x574.png\" alt=\"\" class=\"wp-image-1154\" srcset=\"http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/\u622a\u5c4f2024-07-12-17.38.18-1024x574.png 1024w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/\u622a\u5c4f2024-07-12-17.38.18-300x168.png 300w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/\u622a\u5c4f2024-07-12-17.38.18-768x431.png 768w, http:\/\/www.spiceandwolf.com.cn\/wp-content\/uploads\/2024\/07\/\u622a\u5c4f2024-07-12-17.38.18.png 1362w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u7684\u597d\u5904\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b89\u5168\u6027\u3002<\/li>\n\n\n\n<li>\u907f\u514d\u91cd\u590d\u52a0\u8f7d\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">JVM\u5783\u573e\u56de\u6536\u673a\u5236<\/h2>\n\n\n\n<p>JVM\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u9700\u8981\u88ab\u5783\u573e\u56de\u6536\u7684\u5173\u952e\u5c31\u662f\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4ecd\u5728\u88ab\u4f7f\u7528\uff0c\u6ca1\u6709\u88ab\u4f7f\u7528\u5219\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\u3002\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5f15\u7528\u8ba1\u6570\u5668\u3002\u8be5\u65b9\u6cd5\u4f1a\u4e3a\u6bcf\u4e00\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e2a\u5f15\u7528\u8ba1\u6570\u5668\uff0c\u7528\u6765\u7edf\u8ba1\u5bf9\u8c61\u88ab\u5f15\u7528\u7684\u6b21\u6570\uff0c\u5f53\u5f15\u7528\u6b21\u6570\u964d\u4e3a0\u65f6\uff0c\u5bf9\u8c61\u5c31\u80fd\u88ab\u5783\u573e\u56de\u6536\uff0c\u5982\u679c\u5f15\u7528\u6b21\u6570\u5927\u4e8e0\u5219\u4e0d\u80fd\u88ab\u5783\u573e\u56de\u6536\u3002\n<ul class=\"wp-block-list\">\n<li>\u4f18\u70b9\u3002\u5b9e\u73b0\u7b80\u5355\u3002<\/li>\n\n\n\n<li>\u7f3a\u70b9\u3002\u9700\u8981\u989d\u5916\u7684\u5185\u5b58\u7a7a\u95f4\u5b58\u50a8\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u5668\u3002<\/li>\n\n\n\n<li>\u95ee\u9898\u3002\u5b58\u5728\u5bf9\u8c61\u5faa\u73af\u5f15\u7528\u4f46\u662f\u4e24\u4e2a\u5bf9\u8c61\u5df2\u7ecf\u4f7f\u7528\u5b8c\u7684\u60c5\u51b5\uff0c\u56e0\u4e3a\u4e24\u4e2a\u5faa\u73af\u5f15\u7528\u5bf9\u8c61\u7684\u5f15\u7528\u6b21\u6570\u4e00\u76f4\u5927\u4e8e0\uff0c\u6240\u4ee5\u90fd\u4e0d\u4f1a\u88ab\u56de\u6536\uff0c\u8fd9\u5c31\u9020\u6210\u4e86\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u53ef\u8fbe\u6027\u5206\u6790\u3002\u8be5\u7b97\u6cd5\u7684\u57fa\u672c\u601d\u8def\u5c31\u662f\u5c06GC ROOT\u5bf9\u8c61\u4f5c\u4e3a\u8d77\u70b9\uff0c\u5411\u4e0b\u641c\u7d22\u548cGC root\u5bf9\u8c61\u6709\u76f4\u63a5\u6216\u95f4\u63a5\u5f15\u7528\u5173\u7cfb\u7684\u5bf9\u8c61\uff0c\u5982\u679c\u8fd9\u4e9b\u5bf9\u8c61\u53ef\u8fbe\uff0c\u5c31\u8868\u793a\u4ecd\u5728\u4f7f\u7528\uff0c\u4e0d\u80fd\u88ab\u5783\u573e\u56de\u6536\uff0c\u5982\u679c\u4e0d\u53ef\u8fbe\u5219\u8868\u793a\u5df2\u7ecf\u4e0d\u9700\u8981\u4f7f\u7528\u4e86\uff0c\u5c31\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\u3002\u76ee\u524d\u4e3b\u6d41\u7684\u5783\u573e\u56de\u6536\u65b9\u6848\u90fd\u662f\u91c7\u7528\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5bf9\u8c61\u521b\u5efa\u6d41\u7a0b new String(&#8220;xyz&#8221;)\u4f1a\u521b\u5efa\u51e0\u4e2a\u5bf9\u8c61 \u5728\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u65f6\uff0c\u4f1a\u6309 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25,85,86],"tags":[],"class_list":["post-1430","post","type-post","status-publish","format-standard","hentry","category-code","category-interview","category-java"],"_links":{"self":[{"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1430"}],"version-history":[{"count":4,"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1430\/revisions"}],"predecessor-version":[{"id":1518,"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1430\/revisions\/1518"}],"wp:attachment":[{"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1430"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.spiceandwolf.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}