{"id":3391,"date":"2026-07-01T02:08:26","date_gmt":"2026-07-01T02:08:26","guid":{"rendered":"https:\/\/csofferprep.com\/paypal-swe-oa-hackerrank-oop-api-debug\/"},"modified":"2026-07-02T00:00:05","modified_gmt":"2026-07-02T00:00:05","slug":"paypal-swe-oa-hackerrank-oop-api-debug","status":"publish","type":"post","link":"https:\/\/csofferprep.com\/en\/oa\/paypal-swe-oa-hackerrank-oop-api-debug\/","title":{"rendered":"PayPal SWE OA \u9762\u7ecf\uff5cHackerRank\u3001Java OOP \u4e0e API Debug \u9898\u578b\u89e3\u6790"},"content":{"rendered":"<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/csofferprep.com\/wp-content\/uploads\/2026\/07\/csofferprep_paypal_oa_2026-07-01.png\" alt=\"PayPal OA \u9762\u7ecf\u914d\u56fe\" \/><\/figure>\n<p>PayPal OA \u7684\u8282\u594f\u6bd4\u8f83\u50cf\u4e00\u573a\u538b\u7f29\u7248\u6280\u672f\u9762\uff1aHackerRank \u4e0a\u9650\u65f6\u505a\u9898\uff0c\u9898\u76ee\u4e0d\u53ea\u770b\u7b97\u6cd5\u7b54\u6848\uff0c\u4e5f\u4f1a\u770b Java\/OOP \u4ee3\u7801\u7ec4\u7ec7\u3001\u8fb9\u754c\u5904\u7406\u548c\u89e3\u91ca\u80fd\u529b\u3002\u51c6\u5907\u65f6\u4e0d\u8981\u53ea\u5237\u5355\u70b9\u7b97\u6cd5\uff0c\u6700\u597d\u628a\u5806\u3001\u6808\u3001\u53cc\u6307\u9488\u3001HTTP\/API \u57fa\u7840\u548c\u5c0f\u578b\u7c7b\u8bbe\u8ba1\u653e\u5728\u540c\u4e00\u5957\u7ec3\u4e60\u91cc\u3002\u6392\u67e5\u6d41\u7a0b\u548c\u8f6e\u6b21\u65f6\uff0c\u53ef\u4ee5\u5148\u770b\u8fd9\u4efd <a href=\"https:\/\/www.interviewquery.com\/guides\/paypal-software-engineer\" target=\"_blank\" rel=\"noopener\">PayPal Software Engineer Interview Guide<\/a>\uff0c\u518d\u6309\u81ea\u5df1\u7684\u5c97\u4f4d\u8865\u5f3a\u8bed\u8a00\u548c\u540e\u7aef\u57fa\u7840\u3002<\/p>\n<h2>\u7b2c\u4e00\u9898\uff1a\u4ea4\u6613\u4e8b\u4ef6\u7a97\u53e3\u7edf\u8ba1<\/h2>\n<h3>\u9898\u76ee\u63cf\u8ff0<\/h3>\n<p>\u7ed9\u5b9a\u4e00\u7ec4\u652f\u4ed8\u4e8b\u4ef6 <code>events = [(userId, merchantId, amount, timestamp)]<\/code>\uff0c\u518d\u7ed9\u4e00\u4e2a\u7a97\u53e3\u957f\u5ea6 <code>k<\/code> \u5206\u949f\uff0c\u8981\u6c42\u8f93\u51fa\u6bcf\u4e2a\u7528\u6237\u5728\u4efb\u610f\u8fde\u7eed\u7a97\u53e3\u5185\u7684\u6700\u9ad8\u4ea4\u6613\u603b\u989d\u3002\u8f93\u5165\u5df2\u7ecf\u6309\u65f6\u95f4\u6392\u5e8f\uff0c\u540c\u4e00\u4e2a\u7528\u6237\u4f1a\u51fa\u73b0\u591a\u6b21\uff0c\u540c\u4e00\u4e2a\u65f6\u95f4\u70b9\u4e5f\u4f1a\u6709\u591a\u7b14\u4ea4\u6613\u3002\u8ffd\u95ee\u8981\u6c42\u652f\u6301\u53ea\u7edf\u8ba1\u6210\u529f\u4ea4\u6613\uff0c\u5e76\u5728\u91d1\u989d\u76f8\u540c\u7684\u65f6\u5019\u8fd4\u56de\u66f4\u65e9\u51fa\u73b0\u7684\u7a97\u53e3\u3002<\/p>\n<h3>\u89e3\u9898\u601d\u8def<\/h3>\n<p>\u5148\u6309 <code>userId<\/code> \u5206\u7ec4\u5904\u7406\uff0c\u7ec4\u5185\u7528\u53cc\u6307\u9488\u7ef4\u62a4 <code>[left, right]<\/code> \u8fd9\u4e2a\u65f6\u95f4\u7a97\u53e3\u3002<code>right<\/code> \u6bcf\u6b21\u52a0\u5165\u4e00\u7b14\u4ea4\u6613\uff0c\u7a97\u53e3\u603b\u989d\u52a0\u4e0a\u5f53\u524d\u91d1\u989d\uff1b\u5f53 <code>timestamp[right] - timestamp[left] &gt; k * 60<\/code> \u65f6\uff0c\u6301\u7eed\u79fb\u52a8 <code>left<\/code> \u5e76\u6263\u6389\u79bb\u5f00\u7684\u91d1\u989d\u3002\u6bcf\u6b21\u7a97\u53e3\u5408\u6cd5\u540e\u66f4\u65b0\u7b54\u6848\u3002\u6210\u529f\u4ea4\u6613\u7684\u8fc7\u6ee4\u4e0d\u8981\u653e\u5728\u7a97\u53e3\u5916\u5355\u72ec\u5efa\u65b0\u6570\u7ec4\uff0c\u76f4\u63a5\u5728\u52a0\u5165\u548c\u79fb\u51fa\u65f6\u5224\u65ad\u72b6\u6001\uff0c\u53ef\u4ee5\u5c11\u4e00\u6b21\u5185\u5b58\u590d\u5236\u3002\u91d1\u989d\u76f8\u540c\u8fd4\u56de\u66f4\u65e9\u7a97\u53e3\u65f6\uff0c\u6bd4\u8f83\u5f53\u524d\u7a97\u53e3\u5de6\u7aef\u65f6\u95f4\u548c\u5df2\u8bb0\u5f55\u65f6\u95f4\u3002<strong>\u590d\u6742\u5ea6<\/strong>\uff1a\u6bcf\u4e2a\u7528\u6237\u7684\u6307\u9488\u53ea\u524d\u8fdb\uff0c\u6574\u4f53\u65f6\u95f4 O(n)\uff0c\u989d\u5916\u7a7a\u95f4 O(u)\uff0c\u5176\u4e2d <code>u<\/code> \u662f\u7528\u6237\u6570\u3002<\/p>\n<h2>\u7b2c\u4e8c\u9898\uff1aJava OOP \u8ba2\u5355\u72b6\u6001\u673a<\/h2>\n<h3>\u9898\u76ee\u63cf\u8ff0<\/h3>\n<p>\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5316\u7248\u4ed8\u6b3e\u8ba2\u5355\u72b6\u6001\u673a\u3002\u8ba2\u5355\u4ece <code>CREATED<\/code> \u5f00\u59cb\uff0c\u652f\u6301 <code>authorize()<\/code>\u3001<code>capture()<\/code>\u3001<code>refund()<\/code>\u3001<code>cancel()<\/code> \u56db\u4e2a\u64cd\u4f5c\u3002\u975e\u6cd5\u72b6\u6001\u8f6c\u6362\u8981\u629b\u51fa\u6e05\u6670\u9519\u8bef\uff1b\u91cd\u590d\u8c03\u7528\u540c\u4e00\u4e2a\u64cd\u4f5c\u4e0d\u80fd\u628a\u8ba2\u5355\u5e26\u5230\u9519\u8bef\u72b6\u6001\uff1b\u6bcf\u6b21\u72b6\u6001\u53d8\u5316\u8981\u8bb0\u5f55\u4e00\u6761\u5ba1\u8ba1\u65e5\u5fd7\u3002\u8ffd\u95ee\u8981\u6c42\u652f\u6301\u4e0d\u540c\u652f\u4ed8\u6e20\u9053\u7684\u624b\u7eed\u8d39\u8ba1\u7b97\u3002<\/p>\n<h3>\u89e3\u9898\u601d\u8def<\/h3>\n<p>\u628a\u72b6\u6001\u8f6c\u6362\u8868\u5199\u6e05\u695a\uff0c\u6bd4\u5728\u6bcf\u4e2a\u65b9\u6cd5\u91cc\u5806 <code>if else<\/code> \u66f4\u7a33\u3002\u53ef\u4ee5\u7528 <code>EnumMap&lt;State, Set&lt;Action&gt;&gt;<\/code> \u8868\u793a\u5141\u8bb8\u7684\u52a8\u4f5c\uff0c\u518d\u7528\u4e00\u4e2a\u79c1\u6709\u65b9\u6cd5 <code>transition(action, nextState)<\/code> \u505a\u6821\u9a8c\u3001\u66f4\u65b0\u72b6\u6001\u548c\u5199\u5ba1\u8ba1\u65e5\u5fd7\u3002\u624b\u7eed\u8d39\u8ba1\u7b97\u5355\u72ec\u62bd\u6210 <code>FeePolicy<\/code> \u63a5\u53e3\uff0c\u4fe1\u7528\u5361\u3001\u4f59\u989d\u3001PayPal wallet \u5404\u81ea\u5b9e\u73b0\uff0c\u8ba2\u5355\u5bf9\u8c61\u53ea\u4f9d\u8d56\u63a5\u53e3\u3002\u91cd\u590d\u8c03\u7528 <code>capture()<\/code> \u65f6\uff0c\u5982\u679c\u8ba2\u5355\u5df2\u7ecf\u662f <code>CAPTURED<\/code>\uff0c\u76f4\u63a5\u8fd4\u56de\u5f53\u524d\u72b6\u6001\u548c\u65e5\u5fd7\uff0c\u4e0d\u518d\u8ffd\u52a0\u65b0\u7684 capture \u8bb0\u5f55\uff1b\u5982\u679c\u5df2\u7ecf <code>REFUNDED<\/code> \u6216 <code>CANCELLED<\/code>\uff0c\u629b\u51fa\u4e1a\u52a1\u9519\u8bef\u3002\u8fd9\u4e2a\u9898\u7684\u5f97\u5206\u70b9\u4e0d\u5728\u7c7b\u540d\uff0c\u800c\u5728\u72b6\u6001\u8fb9\u754c\u3001\u5e42\u7b49\u5904\u7406\u548c\u6d4b\u8bd5\u7528\u4f8b\u3002<\/p>\n<h2>\u7b2c\u4e09\u9898\uff1aAPI Debug \u4e0e\u91cd\u8bd5\u903b\u8f91<\/h2>\n<h3>\u9898\u76ee\u63cf\u8ff0<\/h3>\n<p>\u7ed9\u4e00\u6bb5\u8c03\u7528\u98ce\u63a7\u670d\u52a1\u7684\u4ee3\u7801\uff0c\u4ee3\u7801\u5728\u9047\u5230 <code>429<\/code>\u3001<code>500<\/code> \u548c\u7f51\u7edc\u8d85\u65f6\u65f6\u4f1a\u76f4\u63a5\u5931\u8d25\u3002\u8981\u6c42\u4fee\u590d\u5b83\uff1a\u5bf9\u53ef\u91cd\u8bd5\u9519\u8bef\u505a\u6307\u6570\u9000\u907f\uff0c\u4fdd\u7559\u6700\u5927\u91cd\u8bd5\u6b21\u6570\uff1b\u5bf9 <code>400\/401\/403<\/code> \u8fd9\u7c7b\u9519\u8bef\u7acb\u5373\u8fd4\u56de\uff1b\u8bf7\u6c42\u5fc5\u987b\u5e26\u5e42\u7b49\u952e\uff0c\u65e5\u5fd7\u91cc\u4e0d\u80fd\u6253\u5370\u5b8c\u6574 token\u3002\u8ffd\u95ee\u8981\u6c42\u89e3\u91ca GET \u548c POST \u7684\u533a\u522b\uff0c\u4ee5\u53ca\u4e3a\u4ec0\u4e48\u652f\u4ed8\u7c7b\u63a5\u53e3\u9700\u8981\u5e42\u7b49\u952e\u3002<\/p>\n<h3>\u89e3\u9898\u601d\u8def<\/h3>\n<p>\u5148\u628a\u9519\u8bef\u5206\u6210\u4e09\u7c7b\uff1a\u4e0d\u53ef\u91cd\u8bd5\u3001\u53ef\u91cd\u8bd5\u3001\u672a\u77e5\u9519\u8bef\u3002\u53ef\u91cd\u8bd5\u5206\u652f\u7528 <code>for attempt in range(maxRetries + 1)<\/code> \u63a7\u5236\u6b21\u6570\uff0c\u9000\u907f\u65f6\u95f4\u53ef\u4ee5\u4ece <code>baseDelay<\/code> \u5f00\u59cb\u7ffb\u500d\uff0c\u5e76\u52a0\u4e00\u4e2a\u5f88\u5c0f\u7684 jitter\uff0c\u907f\u514d\u5e76\u53d1\u8bf7\u6c42\u540c\u65f6\u6253\u56de\u540e\u7aef\u3002\u5e42\u7b49\u952e\u653e\u5728 header\uff0c\u4f8b\u5982 <code>Idempotency-Key<\/code>\uff0c\u540c\u4e00\u7b14\u4e1a\u52a1\u8bf7\u6c42\u5931\u8d25\u540e\u91cd\u8bd5\u65f6\u5fc5\u987b\u4fdd\u6301\u4e00\u81f4\u3002\u65e5\u5fd7\u53ea\u8bb0\u5f55\u72b6\u6001\u7801\u3001requestId\u3001\u4e1a\u52a1 orderId \u548c token \u7684\u540e\u56db\u4f4d\u3002GET \u9002\u5408\u8bfb\u8d44\u6e90\uff0cPOST \u9002\u5408\u521b\u5efa\u6216\u89e6\u53d1\u52a8\u4f5c\uff1b\u652f\u4ed8 capture\/refund \u7528 POST \u65f6\uff0c\u5e42\u7b49\u952e\u80fd\u9632\u6b62\u7f51\u7edc\u8d85\u65f6\u540e\u91cd\u590d\u6263\u6b3e\u6216\u91cd\u590d\u9000\u6b3e\u3002\u6d4b\u8bd5\u7528\u4f8b\u8981\u8986\u76d6\u6210\u529f\u3001429 \u540e\u6210\u529f\u3001\u8d85\u8fc7\u91cd\u8bd5\u6b21\u6570\u3001401 \u7acb\u5373\u5931\u8d25\u3001\u65e5\u5fd7\u8131\u654f\u4e94\u7c7b\u3002<\/p>\n<h2>\u5907\u8003\u5efa\u8bae<\/h2>\n<p>PayPal OA \u4e0d\u9002\u5408\u53ea\u6309\u9898\u53f7\u5237\u3002\u7b97\u6cd5\u90e8\u5206\u8981\u628a\u6808\u3001\u5806\u3001\u53cc\u6307\u9488\u3001\u6811\u548c\u5b57\u7b26\u4e32\u6574\u7406\u6210\u6a21\u677f\uff1bJava \u90e8\u5206\u8981\u80fd\u5199\u51fa\u53ef\u6d4b\u7684\u7c7b\uff0c\u800c\u4e0d\u662f\u53ea\u8bb2\u6982\u5ff5\uff1bAPI Debug \u8981\u80fd\u89e3\u91ca\u72b6\u6001\u7801\u3001\u5e42\u7b49\u3001\u8d85\u65f6\u548c\u65e5\u5fd7\u8131\u654f\u3002\u7ec3\u4e60\u65f6\u7ed9\u81ea\u5df1 90 \u5206\u949f\uff0c\u5148\u628a\u4e24\u9053\u4e3b\u903b\u8f91\u5199\u5b8c\uff0c\u518d\u8865\u5f02\u5e38\u5206\u652f\u548c\u590d\u6742\u5ea6\u8bf4\u660e\u3002<\/p>\n<h2>FAQ<\/h2>\n<h3>PayPal OA \u9700\u8981\u91cd\u70b9\u51c6\u5907 Java \u5417\uff1f<\/h3>\n<p>\u5982\u679c\u5c97\u4f4d\u63cf\u8ff0\u504f\u540e\u7aef\u6216\u5e73\u53f0\u5de5\u7a0b\uff0cJava\/OOP \u7684\u51c6\u5907\u5f88\u6709\u4ef7\u503c\u3002\u81f3\u5c11\u8981\u719f\u6089\u63a5\u53e3\u3001\u679a\u4e3e\u3001\u5f02\u5e38\u3001\u96c6\u5408\u7c7b\u3001\u7ebf\u7a0b\u5b89\u5168\u57fa\u7840\u548c\u5355\u5143\u6d4b\u8bd5\u5199\u6cd5\u3002<\/p>\n<h3>API Debug \u9898\u600e\u4e48\u7ec3\uff1f<\/h3>\n<p>\u627e\u4e00\u6bb5\u771f\u5b9e\u4e1a\u52a1\u98ce\u683c\u7684 HTTP client \u4ee3\u7801\uff0c\u81ea\u5df1\u52a0\u4e0a\u91cd\u8bd5\u3001\u8d85\u65f6\u3001\u5e42\u7b49\u952e\u3001\u65e5\u5fd7\u8131\u654f\u548c\u9519\u8bef\u5206\u7c7b\u3002\u53ea\u4f1a\u5199\u7b97\u6cd5\u9898\uff0c\u9047\u5230\u8fd9\u79cd\u5de5\u7a0b\u9898\u4f1a\u5f88\u5403\u4e8f\u3002<\/p>\n<h2>\u5173\u4e8e CSOFFERPREP<\/h2>\n<p>\u8fdb VO \u4e4b\u524d\uff0c\u53ef\u4ee5\u627e CSOFFERPREP \u505a\u5b9e\u65f6\u9762\u8bd5\u52a9\u653b\u548c\u5907\u8003\u8f85\u5bfc\u3002CSOFFERPREP \u6df1\u8015\u5317\u7f8e IT \u884c\u4e1a\u591a\u5e74\uff0c\u5df2\u5e2e\u52a9\u4e07\u4f59\u540d\u5b66\u751f\u8fdb\u5165\u5168\u7403 500 \u5f3a\u4f01\u4e1a\u3002\u5bfc\u5e08\u6765\u81ea\u4e00\u7ebf\u5927\u5382\u8d44\u6df1\u5de5\u7a0b\u5e08\u548c\u9762\u8bd5\u5b98\uff0c\u5bf9 PayPal \u8fd9\u7c7b\u6ce8\u91cd\u5de5\u7a0b\u843d\u5730\u7684\u516c\u53f8\u7684\u9762\u8bd5\u5957\u8def\u5f88\u719f\u6089\u3002\u65e0\u8bba\u662f OA\u8f85\u52a9\u3001OA \u8f85\u5bfc\u3001VO \u8f85\u52a9\u3001VO \u6a21\u62df\u9762\u8bd5\u3001VO \u8f85\u52a9\u8fd8\u662f\u7cfb\u7edf\u8bbe\u8ba1\u8f85\u52a9\uff0c\u90fd\u53ef\u4ee5\u83b7\u5f97\u66f4\u6709\u9488\u5bf9\u6027\u7684\u51c6\u5907\u65b9\u6848\uff1a<a href=\"https:\/\/csofferprep.com\/price\/\" target=\"_blank\" rel=\"noopener\">CSOFFERPREP \u00b7 \u670d\u52a1\u8be6\u60c5<\/a><\/p>\n<h2>\u53c2\u8003\u6765\u6e90<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.interviewquery.com\/guides\/paypal-software-engineer\" target=\"_blank\" rel=\"noopener\">PayPal Software Engineer Interview Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.glassdoor.com\/Interview\/PayPal-Software-Engineer-Interview-Questions-EI_IE9848.0%2C6_KO7%2C24.htm\" target=\"_blank\" rel=\"noopener\">PayPal Software Engineer Interview Questions<\/a><\/li>\n<li><a href=\"https:\/\/leetcode.com\/problems\/next-greater-element-ii\/\" target=\"_blank\" rel=\"noopener\">Next Greater Element II<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>PayPal SWE OA \u9762\u7ecf\u590d\u76d8\uff0c\u8986\u76d6 HackerRank \u9650\u65f6\u9898\u3001Java OOP \u72b6\u6001\u673a\u3001API Debug\u3001\u5e42\u7b49\u91cd\u8bd5\u548c\u5907\u8003\u91cd\u70b9\u3002<\/p>","protected":false},"author":4,"featured_media":3390,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-3391","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oa","resize-featured-image"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"PayPal SWE OA \u9762\u7ecf\u590d\u76d8\uff0c\u8986\u76d6 HackerRank \u9650\u65f6\u9898\u3001Java OOP \u72b6\u6001\u673a\u3001API Debug\u3001\u5e42\u7b49\u91cd\u8bd5\u548c\u5907\u8003\u91cd\u70b9\u3002\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Jassi Chen\"\/>\n\t<meta name=\"google-site-verification\" 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