jvm interview questions

Common Database interview questions and database questions Paradigm 1: Each column in a database table is a basic data item that cannot be further divided. values or duplicate attributes are not allowed. For example, if a table contains a phone number field, the value has a mobile phone number, there is another seat number, which does not match.Summary: fields c

Js interview questions-inheritance of js, js questions-js Js is a flexible language. There are often multiple ways to implement a function. ECMAScript does not have a clear Inheritance Mechanism, but is achieved through imitation. According to the characteristics of js, js implementation inheritance has the following common methods:1. Use object impersonating to

10 classic Java interview questions and classic java questions 1. How does Java's HashMap work? HashMap is a key value for the data structure. Each key has a corresponding value. The key is to identify such a value. Based on the hashing principle, HashMap stores and obtains objects through put () and get () methods. When we pass a key-value pair to the put () m

Computer Network interview questions, computer network questions 1,OSI Layer-7 protocol,Layer-4 TCP/IP protocol,Five-Layer Protocol mentioned in instructor Xie xiiren's online textbookComparison Note: (1) OSI's layer-7 protocol is only a theoretical protocol, which is not actually used. (2) the architecture of the layer-4 TCP/IP protocol in practice. (3) The fiv

Ddchuxing -- Summary of php interview questions and ddchuxingphp questions 1. Differences between echo and print Echo has no return value. print has return value 1. If the execution fails, false is returned. echo outputs faster than print because no return value exists. echo can output one or more strings, print can only output one string. print can be used for c

PHP interview questions, php questions Tip: Set the PHP file character encoding header ("content-type: text/html; charset = UTF-8") before the test code "); 1. 1.1 Use PHP to get the current time and print it. Format: 22:19:30 2. 2.1 convert string to array $ Str = "www.baidu.com ";$ Arr_str =Explode('.', $ Str );Print_r ($ arr_str); // Array ([0] => www [1] =>

Java interview questions, java questions 1. storage structures used by stacks and queues Chain storage and sequential Storage 2. understanding of time complexity and space complexityTime Complexity: Number of statement executions in an algorithm, which is T (n). When n changes, it is O (f (n). For example, constant O (1 ), O (n2), O (nlog2n)Space complexity: t

This article focuses on the question of Ajax questions and answers, you can take a look at the interview of those who are how to issue, and see what the correct answer is. Now, let's see this article. 1. Do you interact with the background during work? Well, can you tell me a few parameters in the encapsulated Ajax? URL: The address where the request was sent. Type: The request method (post or get) defaults

Summary of interview questions and summary of questions 1. Describe the animation mechanism in detail2. Describe the event mechanism3. Description: Measure and Layout. Draw process. When the size of a subclass changesWhat kind of chain reaction will it cause?4. What are the four main components of Android? 4 startup modes of Activity5. Start the Service in two w

[Programmer interview questions selected 100 questions] 11. Search for binary tree images.[Question] Enter a binary search tree and convert it to its image. That is, in the converted Binary Search Tree, the nodes in the left subtree are greater than those in the right subtree. Use recursive and cyclic methods to convert tree images. For example, enter: 8/\6 10/\/

PHP Interview Questions and Answers, php Questions and answers 1. Write a function to implement the following functions:Convert the string "open_door" to "OpenDoor" and "make_by_id" to "MakeById ".Function str_change ($ str ){$ Str = str_replace ("_", "", $ str );$ Str = ucwords ($ str );$ Str = str_replace ("", "", $ str );Return $ str ;} 2. Write a program to c

Summary of HTML interview questions H5, questions h51. What are the new features of H5 and what elements are removed? How to deal with the compatibility of new h5 labels in browsers and how to distinguish between html and html5 1. html5 is not a subset of SGL (General Markup Language), but includes: image, location, storage, multitasking, and other functions. 2.

Multithreading and concurrency issues are one of the questions that interviewers prefer to ask in a Java technology interview. Here, the most important questions are listed from the interview point of view, but you should still have a solid grasp of Java multithreading Basics to meet the future problems. (Proofing Note

Common Database interview questions and database questions1. Foreign key candidates for primary key superkeys Primary key: A combination of data columns or attributes that are unique and fully identified for the stored data objects in the database table.A data column can have only one primary key.And the value of the primary key cannot be missing, that is, it cannot be Null ). Superkeys: The attribute set t

Activity interview questions, activity questionsWhat is Activity? Activity is one of the four main components of Android. Generally, a user interface corresponds to an Activity. At the same time, Activity is a subclass of Context, and it also implements the Window interface and KeyEvent interface to process the Window-User Interaction Events.Briefly describe the lifecycle of the Activity Activity lifecycle

Select an appropriate function declaration for the user-defined function is_leap. Is_leap uses 2000 as the default year. Php programmer recruitment questions: Problem 1. select the appropriate answer and fill in the blank space PHP is a ______ scripting language based on the ______ engine. PHP is most often used to develop dynamic ______ In addition, it can also be used to generate ______ (and others) documents. A. dynamic, PHP, database, HTML B. embe

Java interview questions, java questions1/** 2 * write a function. It accepts an integer (assuming length) and returns an array. The length of the array is length, 3 * the content in the array is a random value ranging from 0 to (length-1) and cannot be repeated. 4*5 * If the length is 5, the array may be [, 4]. 6*7 * @ author Administrator 8*9 */10 11 import java. util. arrayList; 12 import java. util. lis

., GC can avoid memory leaks and stack overflow, effectively improve the efficiency of memory utilization, It also frees programmers from tedious memory management.The string S=new string ("xyz"); How many stringobject are created?2, 1 in the text pool, 1 in the heap, first create 1 "XYZ" objects in the text pool, and then copy an "XYZ" object in the heap and assign it to the reference S.Ninth, Math.Round (11.5) How much? Math.Round (-11.5) how much?Math.Round (x) equals (int) Math.floor (x+o.5f

Address: http://zhedahht.blog.163.com/blog/static/254111742007127104759245/ Question: enter a binary search tree and convert it into a sorted two-way linked list. You must not create any new node. You only need to adjust the pointer point. For example, Binary Search Tree10/\6 14/\/\4 8 12 16Convert to a two-way linked list 4 = 6 = 8 = 10 = 12 = 14 = 16. Analysis: This is Microsoft's interview question. Many tree-related

. After creating an array or an object in the heap, you can also define a special variable in the stack that is equal to the first address of the array or object in the heap memory, and this variable in the stack becomes the reference variable of the array or object. The reference variable in the stack can then be used in the program to access an array or an object in the heap, which is equivalent to a name that is an array or an object.2 0. Can i cast int to a variable of type byte?What happens