從外包到拿下阿里offer,這2年5個月13天到底發生了什麼?

{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"開篇介紹","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"個人背景:","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"不說太多廢話,但起碼要讓你先對我有一個基本的瞭解。本人畢業於浙江某二本院校,算是科班出身,畢業後就進了一家外包公司做開發,當然不是阿里的外包,具體什麼公司就不透露了,在外包一呆就呆了整整2年多,直到現在才從外包離開,如今拿到阿里的offer準備入職了。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"闡述原因:","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在外包公司的兩年裏,作爲一名菜雞,確實非常合格,技術沒什麼長進,眼見也沒有提升,沒規劃沒未來,讓人實在焦慮,之所以開始改變自己也是家庭發生了變故,才讓自己開始思考人生。身邊很多人感嘆過,能從外包逆襲,算是傳奇,所以今天想要分享一下個人的經歷,希望能夠鼓勵到一些與我有相似經歷的同行。","attrs":{}}]},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"注意:這次面試過程比較長,內容繁多,在文章中我基本上簡述了,文章裏的面試題完整版和我個人的總結方法經驗(面試學習和刷題筆記),都整理有PDF完整版,有需要的可以見下圖添加上小助手即可獲取到了","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}],"attrs":{}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/92/9254a45db72389767cc7770b3867a989.png","alt":null,"title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/98/98955d934f4c3cbca4945717f6ebc881.jpeg","alt":"2年5個月13天,從外包到拿下阿里offer,沒想到屌絲也能有今天","title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"阿里一角","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"阿里巴巴Java崗面試題分享","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"1.HashMap 的內部結構?內部原理?和 HashTable 的區別,假如發⽣了 hash 碰撞,如何設計能讓遍歷效率⾼?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"2.講一講講講","attrs":{}},{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":" ","attrs":{}},{"type":"text","text":"ConcurrentHashMap吧。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"3.講一下JVM虛擬機內存結構,以及它們的作⽤。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"4.講講JVM的類加載過程&&雙親委派模型。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"5.談談Java的垃圾回收算法。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"6.談談Java垃圾回收的觸發條件。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"7.synchronized和Lock的區別。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"8.volatile的作⽤,爲什麼會出現變量讀取不⼀致的情況,與 synchronized 的區別?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"9.++i","attrs":{}},{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":" ","attrs":{}},{"type":"text","text":"在多線程環境下是否存在問題,怎麼解決?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"10.講一講Thread.sleep() 和 Thread.yield() 區別?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"11.講講常⽤的容器類?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"12.如何去除 ArrayList 的重複元素?","attrs":{}}]},{"type":"bulletedlist","content":[{"type":"listitem","attrs":{"listStyle":null},"content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"直接採⽤ HashSet 即可。作爲它的參數,然後再 addAll。但這種⽅式不能保證原來的順序,如果要求順序,可以使⽤ LinkedHashSet 即可。","attrs":{}}]}]}],"attrs":{}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"13.講講 Java 的泛型擦除,泛型主要是爲了解決什麼問題?如何⽤泛型做 Json 的解析的?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"14.談談 Java 的 Error 和 Exception 的區別聯繫。","attrs":{}}]},{"type":"bulletedlist","content":[{"type":"listitem","attrs":{"listStyle":null},"content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Error 和 Exception 均集成⾃ Throwable,但 Error ⼀般指的是和虛擬機相關的問題,⽐如系統崩潰,虛擬機錯誤,OOM 等,遇到這樣的錯誤,程序應該被終⽌。⽽ Exception 表示程序可以處理的異常,可以捕獲並且可能恢復。","attrs":{}}]}]}],"attrs":{}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"15.說一下軟引⽤和弱引⽤的區別?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"16.成員變量和靜態⽅法可以被重寫麼?重寫的規則是怎樣的?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"17.內部類訪問局部變量的時候,爲什麼變量必須加上fifinal修飾符?","attrs":{}}]},{"type":"bulletedlist","content":[{"type":"listitem","attrs":{"listStyle":null},"content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"因爲⽣命週期不同。","attrs":{}}]}]}],"attrs":{}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"18.什麼情況會造成內存泄漏?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"19.什麼是線程死鎖,如何解決?","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"20.十億條淘寶購買記錄,怎麼獲取出現最多的前十個 ?","attrs":{}}]},{"type":"bulletedlist","content":[{"type":"listitem","attrs":{"listStyle":null},"content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"這是一道典型的有限內存的海量數據處理的題目。一般這類題目的解答無非是以下幾種:","attrs":{}}]}]},{"type":"listitem","attrs":{"listStyle":null},"content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"分治,hash映射,堆排序,雙層桶劃分,Bloom 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