# 針對 Oracle 企業管理器項目的實際 Java 面試問題 > 原文： [https://howtodoinjava.com/interview-questions/real-java-interview-questions-asked-for-oracle-enterprise-manager-project/](https://howtodoinjava.com/interview-questions/real-java-interview-questions-asked-for-oracle-enterprise-manager-project/) [Oracle 企業管理器](https://www.oracle.com/technetwork/oem/enterprise-manager/overview/index.html "oracle enterprise manager")可幫助私有和公共云服務提供商在釋放管理資源的同時，將云服務的速度提高十倍。 這是來自 Oracle 的非常受歡迎的產品。 *HowToDoInJava* 的讀者之一，**Sreenath Ravva**，出現在上述產品（即 oracle 企業管理器）職位的采訪中。 他與我分享了以下列出的問題，以便我可以與大家分享，希望在任何美好的一天中對我們中的幾個人都沒有好處。 注意：我已嘗試在網頁上放置鏈接，以供您參考以下面試問題的答案。 它們可能不足以涵蓋該主題，但是它們可以幫助您入門。 ## 第一輪（電話）java 面試題 **1）您可以開始講述自己和您的項目嗎？** <https://www.youtube.com/embed/CumOvDWnUDY?feature=oembed> **2）什么是 Java 中的抽象和封裝？** – [https://howtodoinjava.com/object-oriented/understanding-abstraction-in-java/](//howtodoinjava.com/object-oriented/understanding-abstraction-in-java/) – [https://howtodoinjava.com/object-oriented/encapsulation-in-java-and-its-relation-with-abstraction/](//howtodoinjava.com/object-oriented/encapsulation-in-java-and-its-relation-with-abstraction/) **3）方法重載規則？ 我們可以在子類中重載超類方法嗎？ 該示例進行了討論。** 1. [https://howtodoinjava.com/2013/07/15/what-is-polymorphism-in-java](//howtodoinjava.com/object-oriented/what-is-polymorphism-in-java/) 2. [http://stackoverflow.com/questions/10901259/java-overloading-rules](https://stackoverflow.com/questions/10901259/java-overloading-rules) **4）方法覆蓋規則？** [http://docs.oracle.com/javase/tutorial/java/IandI/override.html]( http://docs.oracle.com/javase/tutorial/java/IandI/override.html) **5）Java 中的擴大和縮小？ 討論發生在例子上嗎？** [http://stackoverflow.com/questions/16781649/real-world-application-of-widening-narrowing-conversion](https://stackoverflow.com/questions/16781649/real-world-application-of-widening-narrowing-conversion) **6）我在代碼中可以只有`try`塊嗎？** 不。您至少需要`catch`塊或`finally`塊以及`try`塊。（直到 Java 6） 如“Ievgen”在評論中提到的，從 JDK 7 開始，您可以使用[`try-with-resources`](//howtodoinjava.com/java-7/automatic-resource-management-with-try-with-resources-in-java-7/)帶有“可選的”`catch`或`finally`塊。 ```java try (FileInputStream f = new FileInputStream("ttt")) { System.out.println("t"); } ``` **7）線程：生產者和消費者的問題？** * [http://en.wikipedia.org/wiki/Producer-consumer_problem](https://en.wikipedia.org/wiki/Producer-consumer_problem) * [http://howtodoinjava.com/java-5/how-to-use-blockingqueue-and-threadpoolexecutor-in-java/](//howtodoinjava.com/java-5/how-to-use-blockingqueue-and-threadpoolexecutor-in-java/) **8）為什么在`Object`類中定義了`wait()`，`notify()`和`notifyAll()`？** * [http://howtodoinjava.com/2013/03/04/core-java-interview-questions-series-part-2/](//howtodoinjava.com/java/interviews-questions/core-java-interview-questions-series-part-2/) * [http://stackoverflow.com/questions/17840397/concept-behind-putting-wait-notify-methods-in-object-class](https://stackoverflow.com/questions/17840397/concept-behind-putting-wait-notify-methods-in-object-class) **9）我們可以覆蓋`wait()`或`notify()`方法嗎？** 在`Object.java`中，方法`getClass()`，`notify()`，`notifyAll()`和三個`wait()`方法是最終的，因此您無法覆蓋它們。 **10）`wait()`，`sleep()`和`yield()`之間的區別？** [http://stackoverflow.com/questions/9700871/what-is-difference-between-sleep-method-and-yield-method-of-multi-threading](https://stackoverflow.com/questions/9700871/what-is-difference-between-sleep-method-and-yield-method-of-multi-threading) **11）解釋線程類中的`join()`方法** [http://stackoverflow.com/questions/18479771/java-multithreading-concept-and-join-method](https://stackoverflow.com/questions/18479771/java-multithreading-concept-and-join-method) ## 第二輪（面對面）java 面試題 **1) 您可以開始講述自己和您的項目嗎？** *請參閱上面列表中的第一個問題。* **2）您是否遇到內存不足錯誤？ 如果是，您如何解決？ 告訴不同的情況為什么會這樣？** [http://stackoverflow.com/questions/37335/how-to-deal-with-java-lang-outofmemoryerror-java-heap-space-error-64mb-heap](https://stackoverflow.com/questions/37335/how-to-deal-with-java-lang-outofmemoryerror-java-heap-space-error-64mb-heap) **3）數據庫連接泄漏？** [http://blogs.msdn.com/b/snehadeep/archive/2009/04/28/connection-leak-its-symptoms-and-troubleshooting.aspx](https://blogs.msdn.com/b/snehadeep/archive/2009/04/28/connection-leak-its-symptoms-and-troubleshooting.aspx) **4）編寫一個程序，使用第三個變量將兩個數字互換？** ```java import java.io.*; public class SwappingNumberWithoutThirdVariable { public static void main(String[] args)throws IOException { int a = 0 ,b = 1; System.out.println("a = "+a); System.out.println("b = "+b); //Beginning of Swapping a = a + b; b = a - b; a = a - b; //End of Swapping System.out.println("The numbers after swapping are"); System.out.println("a = "+a); System.out.println("b = "+b); } } ``` **5）編寫程序以對數組進行排序并刪除重復項？** [http://stackoverflow.com/questions/17967114/how-to-remove-dumoments-from-an-array-in-java](https://stackoverflow.com/questions/17967114/how-to-remove-duplicates-from-an-array-in-java) **6）在單例上編寫程序？** [https://howtodoinjava.com/design-patterns/singleton-design-pattern-in-java/](//howtodoinjava.com/design-patterns/singleton-design-pattern-in-java/) **7）我有兩個包含整數的數組。 編寫一個程序來合并這兩個數組并刪除重復的元素？ 最后，我需要一個應該具有唯一元素的數組？** [http://stackoverflow.com/questions/5057156/merging-lists-into-a-single-array-with-unique-elements](https://stackoverflow.com/questions/5057156/merging-lists-into-a-single-array-with-unique-elements) **8）編寫程序以使用 JDBC 和結果集從表中獲取數據？** [https://howtodoinjava.com/2013/11/24/jdbc-select-query-example/](//howtodoinjava.com/misc/jdbc-select-query-example/) **9）如何從`HashMap`獲取數據？** [https://howtodoinjava.com/java/interviews-questions/how-hashmap-works-in-java/](//howtodoinjava.com/java/collections/how-hashmap-works-in-java/) **10）`Vector`和`ArrayList`之間的區別？** <https://howtodoinjava.com/java/collections/useful-java-collection-interview-questions/> **11）睡眠和等待之間的區別？** [https://howtodoinjava.com/2013/03/08/difference-between-sleep-and-wait/](//howtodoinjava.com/java/multi-threading/difference-between-sleep-and-wait/) **12）還問了一些 sql 查詢。** 練習一下。 **13）編寫程序來打印斐波那契數列？** ```java public class FibonacciSampleCode { public static void main(String[] args) { FibonacciSampleCode fs = new FibonacciSampleCode(); fs.fibonacci(); } public void fibonacci() { int numb1 = 1; int numb2 = 1; int temp = 0; Scanner input=new Scanner(System.in); System.out.println("How Many Terms? (Up To 45)"); int x=input.nextInt(); x=x-2; System.out.println(numb1); System.out.println(numb2); for (int i = 0; i < x; i++) { System.out.println(numb1 + numb2 + " "); temp = numb1; numb1 = numb2; numb2 = temp + numb2; } } } ``` **14）我們可以像下面的代碼一樣編寫`try catch`塊嗎？** ```java try { try { } } catch() { } ``` [https://howtodoinjava.com/2012/12/why-try-catch-finally-blocks-require-braces/](//howtodoinjava.com/for-fun-only/why-try-catch-finally-blocks-require-braces/) **15）`finally`塊有什么用？** [http://stackoverflow.com/questions/15768645/what-is-the-benefit-to-use-finally-after-try-catch-block-in-java](https://stackoverflow.com/questions/15768645/what-is-the-benefit-to-use-finally-after-try-catch-block-in-java) **16）`final`關鍵字有什么用？** [http://en.wikipedia.org/wiki/Final_%28Java%29](https://en.wikipedia.org/wiki/Final_%28Java%29) **17）我可以將類聲明為靜態嗎？** [http://stackoverflow.com/questions/2376938/why-cant-a-java-class-be-de-clared-as-static](https://stackoverflow.com/questions/2376938/why-cant-a-java-class-be-declared-as-static) **18）什么是靜態方法和靜態變量？** [http://stackoverflow.com/questions/7815664/static-method-and-static-variable-java](https://stackoverflow.com/questions/7815664/static-method-and-static-variable-java) **19）我可以將一個類聲明為私有類嗎？** [http://docs.oracle.com/javase/tutorial/java/javaOO/classdecl.html](https://docs.oracle.com/javase/tutorial/java/javaOO/classdecl.html) **20）如果我在`try`塊中寫`return`會發生什么？ `finally`會執行嗎？ 如果寫入`system.exit()`，`finally`塊會怎樣？** [http://stackoverflow.com/questions/65035/does-finally-always-execute-in-java](https://stackoverflow.com/questions/65035/does-finally-always-execute-in-java) **21）為什么要更改公司？** [http://www.linkedin.com/groups/How-do-you-answer-Why-1792709.S.54631120](https://www.linkedin.com/groups/How-do-you-answer-Why-1792709.S.54631120 ) 沒有人期望你說實話...?? 這是他在寫給我有關此問題的郵件時回想的所有**面試問題**。 我們希望這會對計劃下一次與 oracle 進行面試的我們某些人有所幫助。 **祝您學習愉快！**