{"id":40339,"date":"2024-11-26T16:47:14","date_gmt":"2024-11-26T08:47:14","guid":{"rendered":"https:\/\/fwq.ai\/blog\/40339\/"},"modified":"2024-11-26T16:47:14","modified_gmt":"2024-11-26T08:47:14","slug":"%e7%90%86%e8%a7%a3-java-%e5%86%85%e5%ad%98%e6%a8%a1%e5%9e%8b%ef%bc%9a%e5%a0%86%e5%92%8c%e6%a0%88%e8%a7%a3%e9%87%8a","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/40339\/","title":{"rendered":"\u7406\u89e3 Java \u5185\u5b58\u6a21\u578b\uff1a\u5806\u548c\u6808\u89e3\u91ca"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173241126754550.jpg\" class=\"aligncenter\" title=\"\u7406\u89e3 Java \u5185\u5b58\u6a21\u578b\uff1a\u5806\u548c\u6808\u89e3\u91ca\u63d2\u56fe\" alt=\"\u7406\u89e3 Java \u5185\u5b58\u6a21\u578b\uff1a\u5806\u548c\u6808\u89e3\u91ca\u63d2\u56fe\" \/><\/p>\n<p>\u4e86\u89e3 java \u5982\u4f55\u5904\u7406\u6309\u503c\u4f20\u9012\u548c\u6309\u5f15\u7528\u4f20\u9012\u540e\uff0c\u4e0b\u4e00\u6b65\u662f\u66f4\u6df1\u5165\u5730\u7814\u7a76 java \u7684\u5185\u5b58\u6a21\u578b\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u6211\u4eec\u5c06\u63a2\u8ba8\u5806\u548c\u6808\u2014\u2014java \u5185\u5b58\u7ba1\u7406\u7684\u4e24\u4e2a\u5173\u952e\u7ec4\u4ef6\u3002\u6e05\u695a\u5730\u7406\u89e3\u8fd9\u4e9b\u6982\u5ff5\u5c06\u5e2e\u52a9\u60a8\u7f16\u5199\u9ad8\u6548\u7684\u4ee3\u7801\u3002<\/p>\n<h2> java\u4e2d\u7684\u5806\u548c\u6808\u662f\u4ec0\u4e48\uff1f <\/h2>\n<p>\u5728java\u4e2d\uff0c\u7a0b\u5e8f\u4f7f\u7528\u7684\u5185\u5b58\u5206\u4e3a\u4e24\u4e2a\u4e3b\u8981\u533a\u57df\uff1a<\/p>\n<p>1.\u5806\u5185\u5b58\uff1a\u7528\u4e8e\u5bf9\u8c61\u548c\u7c7b\u5b9e\u4f8b\u7684\u52a8\u6001\u5206\u914d\u3002<\/p>\n<p>2.stack memory\uff1a\u7528\u4e8e\u5b58\u50a8\u65b9\u6cd5\u8c03\u7528\u7ec6\u8282\u3001\u5c40\u90e8\u53d8\u91cf\u548c\u5f15\u7528\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<h3> \u5806\u5185\u5b58\uff1a\u52a8\u6001\u5185\u5b58\u6c60 <\/h3>\n<ul>\n<li>\u7528\u9014\uff1a\u5806\u662f\u5b58\u50a8\u6240\u6709\u5bf9\u8c61\u53ca\u5176\u5b9e\u4f8b\u53d8\u91cf\uff08\u5b57\u6bb5\uff09\u7684\u5730\u65b9\u3002<\/li>\n<li>\u7279\u70b9\uff1a \u7531\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u3002\u5bf9\u8c61\u4fdd\u7559\u5728\u5806\u4e2d\uff0c\u76f4\u5230\u4e0d\u518d\u88ab\u5f15\u7528\u4e3a\u6b62\uff0c\u6b64\u65f6\u5b83\u4eec\u5c31\u6709\u8d44\u683c\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002\u5728\u8fd0\u884c\u65f6\u5206\u914d\u3002<\/li>\n<li>\u7528\u6cd5\u793a\u4f8b\uff1a \u4f7f\u7528 new \u5173\u952e\u5b57\u521b\u5efa\u7684\u4efb\u4f55\u5bf9\u8c61\u90fd\u9a7b\u7559\u5728\u5806\u4e2d\u3002<\/li>\n<\/ul>\n<h4> \u5806\u6808\u5185\u5b58\uff1a\u6267\u884c\u4e0a\u4e0b\u6587 <\/h4>\n<ul>\n<li>\u7528\u9014\uff1a\u5806\u6808\u7528\u4e8e\u7ba1\u7406\u65b9\u6cd5\u6267\u884c\u548c\u5c40\u90e8\u53d8\u91cf\uff08\u539f\u8bed\u548c\u5bf9\u8c61\u5f15\u7528\uff09\u3002\u200b\u200b<\/li>\n<li>\u7279\u70b9\uff1a \u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684\u5806\u6808\uff08\u7ebf\u7a0b\u672c\u5730\u5185\u5b58\uff09\u3002\u9075\u5faa\u540e\u8fdb\u5148\u51fa (lifo) \u539f\u5219\u3002\u5f53\u65b9\u6cd5\u88ab\u8c03\u7528\u548c\u8fd4\u56de\u65f6\u81ea\u52a8\u5206\u914d\u548c\u91ca\u653e\u3002<\/li>\n<li>\u7528\u6cd5\u793a\u4f8b\uff1a \u65b9\u6cd5\u8c03\u7528\u3001\u5c40\u90e8\u53d8\u91cf\u548c\u5bf9\u8c61\u5f15\u7528\u90fd\u5b58\u50a8\u5728\u5806\u6808\u4e2d\u3002<\/li>\n<\/ul>\n<h2> \u5806\u4e0e\u5806\u6808\uff1a\u4e3b\u8981 <\/h2>\n<table>\n<thead>\n<tr>\n<th>feature<\/th>\n<th>stack<\/th>\n<th>heap<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>storage<\/strong><\/td>\n<td>method calls, local variables<\/td>\n<td>objects and instance variables<\/td>\n<\/tr>\n<tr>\n<td><strong><\/strong><\/td>\n<td>lifo (fast)<\/td>\n<td>dynamic access (slower)<\/td>\n<\/tr>\n<tr>\n<td><strong>thread ownership<\/strong><\/td>\n<td>thread-local<\/td>\n<td>shared across all threads<\/td>\n<\/tr>\n<tr>\n<td><strong>lifetime<\/strong><\/td>\n<td>limited to method execution<\/td>\n<td>exists until garbage collected<\/td>\n<\/tr>\n<tr>\n<td><strong>size<\/strong><\/td>\n<td>smaller and fixed<\/td>\n<td>larger and grows dynamically<\/td>\n<\/tr>\n<tr>\n<td><strong>management<\/strong><\/td>\n<td>automatically managed<\/td>\n<td>managed by garbage collector<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2> \u5806\u548c\u6808\u5982\u4f55\u534f\u540c\u5de5\u4f5c <\/h2>\n<p>\u8981\u4e86\u89e3\u5806\u548c\u5806\u6808\u5982\u4f55\u4ea4\u4e92\uff0c\u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\u6309\u503c\u4f20\u9012\u548c\u6309\u5f15\u7528\u4f20\u9012\uff1a<\/p>\n<ol>\n<li>\u539f\u59cb\u7c7b\u578b\uff1a \u76f4\u63a5\u5b58\u50a8\u5728\u6808\u4e2d\u3002 \u4f5c\u4e3a\u526f\u672c\u6309\u503c\u4f20\u9012\u3002<\/li>\n<li>\u5bf9\u8c61\u53c2\u8003\uff1a \u5f15\u7528\uff08\u5185\u5b58\u5730\u5740\uff09\u5b58\u50a8\u5728\u5806\u6808\u4e2d\u3002 \u5b9e\u9645\u7684\u5bf9\u8c61\u5b58\u50a8\u5728\u5806\u4e2d\u3002 \u5f53\u4f20\u9012\u7ed9\u65b9\u6cd5\u65f6\uff0c\u5f15\u7528\u88ab\u590d\u5236\uff0c\u4f46\u5b83\u4ecd\u7136\u6307\u5411\u540c\u4e00\u4e2a\u5806\u5bf9\u8c61\u3002<\/li>\n<\/ol>\n<h2> \u4ee3\u7801\u793a\u4f8b\uff1a\u5b9e\u9645\u7684\u5806\u548c\u6808 <\/h2>\n<p>\u8ba9\u6211\u4eec\u5206\u6790\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\u6765\u4e86\u89e3\u5806\u548c\u5806\u6808\u5185\u5b58\u662f\u5982\u4f55\u4f7f\u7528\u7684\u3002<\/p>\n<pre>class person {\n    string name;\n\n    person(string name) {\n        this.name = name;\n    }\n}\n\npublic class heapstackexample {\n    public static void main(string[] args) {\n        int number = 10; \/\/ stored in the stack\n        person person = new person(\"alice\"); \/\/ reference in stack, object in heap\n\n        system.out.println(\"before: \" + person.name); \/\/ output: alice\n        modifyperson(person);\n        system.out.println(\"after: \" + person.name); \/\/ output: bob\n    }\n\n    public static void modifyperson(person p) {\n        p.name = \"bob\"; \/\/ modifies the object in the heap\n    }\n}\n\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5185\u5b58\u5d29\u6e83\uff1a<\/p>\n<ul>\n<li>\u5806\u6808\u5185\u5b58\uff1a\n<ul>\n<li>number\uff1a\u76f4\u63a5\u5b58\u50a8\u5728\u6808\u4e2d\u3002<\/li>\n<li>person\uff1a\u5b58\u50a8\u5728\u6808\u4e2d\u7684\u5f15\u7528\uff0c\u6307\u5411\u5806\u4e2d\u7684person\u5bf9\u8c61\u3002<\/li>\n<li>p\uff1a\u4eba\u5458\u5f15\u7528\u7684\u526f\u672c\uff0c\u4e5f\u5b58\u50a8\u5728\u5806\u6808\u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5806\u5185\u5b58\uff1a\n<ul>\n<li>\u4e00\u4e2a\u5177\u6709\u540d\u79f0\u5b57\u6bb5\u7684 person \u5bf9\u8c61\uff08\u6700\u521d\u4e3a\u201calice\u201d\uff0c\u4fee\u6539\u540e\u4e3a\u201cbob\u201d\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2> \u65b9\u6cd5\u8c03\u7528\u5982\u4f55\u5f71\u54cd\u5806\u6808 <\/h2>\n<p>\u8c03\u7528\u65b9\u6cd5\u65f6\uff1a<\/p>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5806\u6808\u5e27\u6765\u5b58\u50a8\uff1a\n<ul>\n<li>\u65b9\u6cd5\u53c2\u6570\u3002<\/li>\n<li>\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n<li>\u5b9e\u4f8b\u65b9\u6cd5\u5bf9\u5f53\u524d\u5bf9\u8c61\uff08this\uff09\u7684\u5f15\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5f53\u8be5\u65b9\u6cd5\u8fd4\u56de\u65f6\uff0c\u5176\u5806\u6808\u5e27\u5c06\u88ab\u5220\u9664\uff0c\u4ece\u800c\u91ca\u653e\u5185\u5b58\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre>public class stackdemo {\n    public static void main(string[] args) {\n        int result = calculate(5); \/\/ call method, push stack frame\n        system.out.println(result); \/\/ output: 25\n    }\n\n    public static int calculate(int n) {\n        return n * n; \/\/ stack frame includes 'n'\n    }\n}\n\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li>mn\u65b9\u6cd5\u4e3a\u81ea\u5df1\u521b\u5efa\u4e00\u4e2a\u6808\u5e27\u3002<\/li>\n<li>\u5f53\u8c03\u7528calculate(5)\u65f6\uff0c\u4f1a\u63a8\u9001\u4e00\u4e2a\u65b0\u7684\u5806\u6808\u5e27\u3002<\/li>\n<li>\u8ba1\u7b97\u5b8c\u6210\u540e\uff0c\u5176\u6846\u67b6\u5c06\u5f39\u51fa\uff0c\u5e76\u91ca\u653e\u5185\u5b58\u3002<\/li>\n<\/ul>\n<h2> \u5806\u548c\u5806\u6808\u7684\u5e38\u89c1\u95ee\u9898 <\/h2>\n<ul>\n<li>\n<p>stackerror\uff1a<br \/> \u5f53\u5806\u6808\u5185\u5b58\u4e0d\u8db3\u65f6\u53d1\u751f\uff0c\u901a\u5e38\u662f\u7531\u4e8e\u6df1\u5ea6\u9012\u5f52\u6216\u65e0\u9650\u65b9\u6cd5\u8c03\u7528\u3002<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b\uff1a<\/p>\n<\/li>\n<\/ul>\n<pre>public class stackoverflowexample {\n    public static void recursivemethod() {\n        recursivemethod(); \/\/ infinite recursion\n    }\n\n    public static void main(string[] args) {\n        recursivemethod();\n    }\n}\n\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<ul>\n<li>\n<p>\u5185\u5b58\u4e0d\u8db3\u9519\u8bef\uff1a\u5806\u7a7a\u95f4\uff1a<br \/> \u5f53\u5806\u5df2\u6ee1\u4e14\u65e0\u6cd5\u4e3a\u65b0\u5bf9\u8c61\u5206\u914d\u66f4\u591a\u5185\u5b58\u65f6\u53d1\u751f\u3002<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b\uff1a<\/p>\n<\/li>\n<\/ul>\n<pre>import java.util.ArrayList;\n\npublic class HeapOverflowExample {\n    public static void main(String[] args) {\n        ArrayList&lt;int[]&gt; list = new ArrayList&lt;&gt;();\n        while (true) {\n            list.add(new int[100000]); \/\/ Keep allocating memory\n        }\n    }\n}\n\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<h2> \u4f18\u5316\u5806\u548c\u5806\u6808\u7684\u4f7f\u7528 <\/h2>\n<h4> \u5806\uff1a <\/h4>\n<ul>\n<li>\u4ec5\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u5bf9\u8c61\u3002<\/li>\n<li>\u5bf9\u6602\u8d35\u6216\u91cd\u590d\u7684\u5bf9\u8c61\u4f7f\u7528\u5bf9\u8c61\u6c60\u3002<\/li>\n<li>\u907f\u514d\u521b\u5efa\u4e0d\u5fc5\u8981\u7684\u5f15\u7528\uff0c\u4ece\u800c\u963b\u6b62\u5783\u573e\u56de\u6536\u3002<\/li>\n<\/ul>\n<h3> \u5806\uff1a <\/h3>\n<ul>\n<li>\u907f\u514d\u6df1\u5ea6\u9012\u5f52\u3002<\/li>\n<li>\u4f7f\u7528\u6709\u6548\u7684\u7b97\u6cd5\u6765\u51cf\u5c11\u65b9\u6cd5\u8c03\u7528\u7684\u6b21\u6570\u3002<\/li>\n<\/ul>\n<h2> \u8981\u70b9 <\/h2>\n<ul>\n<li>\u5806\u548c\u6808\u4e00\u8d77\u5de5\u4f5c\uff1a\n<ul>\n<li>\u5bf9\u8c61\u5b58\u50a8\u5728\u5806\u4e2d\uff0c\u800c\u5f15\u7528\u548c\u5c40\u90e8\u53d8\u91cf\u5b58\u50a8\u5728\u5806\u6808\u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5806\u6808\u66f4\u5feb\u4f46\u6709\u9650\uff1a\n<ul>\n<li>\u5b83\u4f1a\u968f\u7740\u65b9\u6cd5\u8c03\u7528\u800c\u81ea\u52a8\u589e\u5927\u548c\u7f29\u5c0f\u3002<\/li>\n<li>\u4e13\u4e3a\u4e34\u65f6\u3001\u7ebf\u7a0b\u672c\u5730\u6570\u636e\u800c\u8bbe\u8ba1\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5806\u66f4\u5927\u4f46\u5171\u4eab\uff1a\n<ul>\n<li>\u7528\u4e8e\u9700\u8981\u5728\u5355\u4e2a\u65b9\u6cd5\u8c03\u7528\u4e4b\u5916\u4fdd\u7559\u7684\u5bf9\u8c61\u3002<\/li>\n<li>\u7531\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u4e86\u89e3\u9650\u5236\uff1a\n<ul>\n<li>\u901a\u8fc7\u53d7\u63a7\u9012\u5f52\u907f\u514d\u3002<\/li>\n<li>\u4f18\u5316\u5bf9\u8c61\u521b\u5efa\u4ee5\u907f\u514d\u5806\u5185\u5b58\u95ee\u9898\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u6df1\u5165\u4e86\u89e3 java \u4e2d\u5806\u548c\u6808\u5185\u5b58\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u60a8\u5c06\u80fd\u591f\u66f4\u597d\u5730\u7f16\u5199\u9ad8\u6548\u3001\u65e0\u9519\u8bef\u7684\u7a0b\u5e8f\uff0c\u5e76\u4e86\u89e3 java \u5982\u4f55\u5728\u5e55\u540e\u7ba1\u7406\u5185\u5b58\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u7406\u89e3 Java \u5185\u5b58\u6a21\u578b\uff1a\u5806\u548c\u6808\u89e3\u91ca\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>\u4e86\u89e3 java \u5982\u4f55\u5904\u7406\u6309\u503c\u4f20\u9012\u548c\u6309\u5f15\u7528\u4f20\u9012\u540e\uff0c\u4e0b\u4e00\u6b65\u662f\u66f4\u6df1\u5165\u5730\u7814\u7a76 java \u7684\u5185\u5b58\u6a21\u578b\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u6211\u4eec\u5c06\u63a2\u8ba8\u5806\u548c\u6808\u2014\u2014java \u5185\u5b58\u7ba1\u7406\u7684\u4e24\u4e2a\u5173\u952e\u7ec4\u4ef6\u3002\u6e05\u695a\u5730\u7406\u89e3\u8fd9\u4e9b\u6982\u5ff5\u5c06\u5e2e\u52a9\u60a8\u7f16\u5199\u9ad8\u6548\u7684\u4ee3\u7801\u3002 java\u4e2d\u7684\u5806\u548c\u6808\u662f\u4ec0\u4e48\uff1f \u5728java\u4e2d\uff0c\u7a0b\u5e8f\u4f7f\u7528\u7684\u5185\u5b58\u5206\u4e3a\u4e24\u4e2a\u4e3b\u8981\u533a\u57df\uff1a 1.\u5806\u5185\u5b58\uff1a\u7528\u4e8e\u5bf9\u8c61\u548c\u7c7b\u5b9e\u4f8b\u7684\u52a8\u6001\u5206\u914d\u3002 2.stack memory\uff1a\u7528\u4e8e\u5b58\u50a8\u65b9\u6cd5\u8c03\u7528\u7ec6\u8282\u3001\u5c40\u90e8\u53d8\u91cf\u548c\u5f15\u7528\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u5806\u5185\u5b58\uff1a\u52a8\u6001\u5185\u5b58\u6c60 \u7528\u9014\uff1a\u5806\u662f\u5b58\u50a8\u6240\u6709\u5bf9\u8c61\u53ca\u5176\u5b9e\u4f8b\u53d8\u91cf\uff08\u5b57\u6bb5\uff09\u7684\u5730\u65b9\u3002 \u7279\u70b9\uff1a \u7531\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u3002\u5bf9\u8c61\u4fdd\u7559\u5728\u5806\u4e2d\uff0c\u76f4\u5230\u4e0d\u518d\u88ab\u5f15\u7528\u4e3a\u6b62\uff0c\u6b64\u65f6\u5b83\u4eec\u5c31\u6709\u8d44\u683c\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002\u5728\u8fd0\u884c\u65f6\u5206\u914d\u3002 \u7528\u6cd5\u793a\u4f8b\uff1a \u4f7f\u7528 new \u5173\u952e\u5b57\u521b\u5efa\u7684\u4efb\u4f55\u5bf9\u8c61\u90fd\u9a7b\u7559\u5728\u5806\u4e2d\u3002 \u5806\u6808\u5185\u5b58\uff1a\u6267\u884c\u4e0a\u4e0b\u6587 \u7528\u9014\uff1a\u5806\u6808\u7528\u4e8e\u7ba1\u7406\u65b9\u6cd5\u6267\u884c\u548c\u5c40\u90e8\u53d8\u91cf\uff08\u539f\u8bed\u548c\u5bf9\u8c61\u5f15\u7528\uff09\u3002\u200b\u200b \u7279\u70b9\uff1a \u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684\u5806\u6808\uff08\u7ebf\u7a0b\u672c\u5730\u5185\u5b58\uff09\u3002\u9075\u5faa\u540e\u8fdb\u5148\u51fa (lifo) \u539f\u5219\u3002\u5f53\u65b9\u6cd5\u88ab\u8c03\u7528\u548c\u8fd4\u56de\u65f6\u81ea\u52a8\u5206\u914d\u548c\u91ca\u653e\u3002 \u7528\u6cd5\u793a\u4f8b\uff1a \u65b9\u6cd5\u8c03\u7528\u3001\u5c40\u90e8\u53d8\u91cf\u548c\u5bf9\u8c61\u5f15\u7528\u90fd\u5b58\u50a8\u5728\u5806\u6808\u4e2d\u3002 \u5806\u4e0e\u5806\u6808\uff1a\u4e3b\u8981 feature stack heap storage method calls, local variables objects and instance variables lifo (fast) dynamic access (slower) thread ownership thread-local shared across all threads lifetime limited 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