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Concise answers to several java interview questions, concise java interview questions The difference between equal and = in java: The equal method is used to compare object references unless it is overwritten (such as String class and basic type package class. And ==except for comparing basic types, it is a comparison value. In other cases, it is a comparison reference address. Java adapter mode? Turn all m

C/c ++ common interview questions, interview questions 1. What is the role of static in C? (1) Hide. When we compile multiple files at the same time, all global variables and functions without the static prefix have global visibility. Therefore, we use static to define functions with the same name and variables with the same name in different files, you don't have to worry about naming conflicts.(2) The sec

Interview knowledge points, computer network interview knowledge points 1. Box Model Standard CSS box model = content + padding + border + margin; IE box model: content + margin (content already contains padding + margin ); 2. In-row elements? Block-level elements? Empty element? Line Elements: a, B, span, img, input, strong, select, label, em, button, textarea Block-level elements: div, ul, li, dl, dt, dd,

Front-end interview preparation Notes 1, interview preparation notes I. Common web security and protection principles 1. SQL Injection principles The SQL command is inserted into the web form to submit or enter the query string of the domain name or page request, and finally the server is deceived to execute malicious SQL commands. In general, there are the following points: 1. Never trust your input. to ve

current variable in the register (working memory) is indeterminate and needs to be read from main memory; Synchronized is the lock of the current variable, and other threads are blocked only if the variable is accessible to the front-thread.(3) volatile does not cause thread blocking, and synchronized can cause thread blocking.(4)volatile can only synchronize the value of a variable between the thread memory and the main memory, while synchronized synchronizes the values of all variables betwee

1 , what are the aspects of object-oriented features ?　　The object-oriented programming language has 4 main features: encapsulation, inheritance, abstraction, polymorphism, etc.Details:http://www.cnblogs.com/guweiwei/p/6599289.html2 , access modifiers public,private,protected, and what is the difference between not writing (the default)? 　　Defaults to default when members of a class do not write access adornments. The default is equivalent to exposing (public) to other classes in the same packag

: The above can solve the POST request garbled problem. There are two garbled methods for GET request Chinese parameter:Modify the Tomcat profile add code to match the project code as follows: Another way to re-encode parameters: StringuserName =newString (Request.getparamter ("UserName"). GetBytes ("Iso8859-1"), "Utf-8") Iso8859-1 is the tomcat default encoding, and the Tomcat encoded content needs to be encoded by utf-8What is

Java's current heat has declined, but there are still a lot of people who learn java. Java's post is also a lot of infiltration. So, those classic Java knowledge points, you can see the problem can say 123? Come and have a look.The difference between 1.JDK and JRE What is the difference between 2.final, finally, and finalize?3. The difference between threads and processesHow does the HashMap in 4.Java work?What is the purpose of garbage collection in 5.Java? When does garbage collection take pla

of STRUTS1 is mainly implemented by Actionform, which is similar to JavaBean, which contains several readable and writable properties for storing data and data validation. In general, an action is equipped with a actionform.Struts1 views are primarily implemented by JSPs. The data that the JSP displays can come from actionform, or it can be the data that the action holds in scope (request,session,application). Of course, using struts's own labels can be a great simplification.After using STRUTS

Mvc: Definition of MVC:M: Business logic processing. "Business model"V: The part that handles the display of the data. "such as XML layout file"C:activity handles user interaction issues. "Activity in MVC plays the role of C." Features of MVC:① and low coupling.②, scalability is good.③ and module responsibilities are clearly divided. An example of MVC is detailed: Summarize:①, the use of MVC design patterns, so that the project has a very good scalability and maintenance.②, contro

requirements graphically in various phases of software development; IBMRational Rose is one of the many UML modeling tools in the requirements phase, often used in drawing examples, class diagrams, sequential graphs. 15. Describe the tool class that you exported, and indicate the maximum amount of data POI (combining cell objects and background color applications) Finally here also found some of Baidu Library interview questions: A lot of content, no

Java interview Knowledge point of database interview 1. Primary key Super Key candidate key foreign key Primary key: A combination of data columns or attributes that are uniquely and fully identified in a database table for storing data objects. A data column can have only one primary key, and the value of a primary key cannot be missing, that is, it cannot be null. Super key: An attribute set that unique

Win in interview Java multithreading (11), interview java Multithreading121. What is a thread? A thread is the smallest unit that the operating system can schedule operations. It is included in the process and is the actual operating unit of the process. Programmers can program with multiple processors. You can use multiple threads to speed up computing-intensive tasks. For example, if a thread needs 100 mi

Spring Interview Questions and Answers, Spring interview questions Spring Overview 1. What is spring? Spring is an open source development framework for java Enterprise applications. Spring is mainly used to develop Java applications, but some extensions are used to build web applications on the J2EE platform. The Spring framework aims to simplify Java enterprise-level application development and promote go

structure if the index structure is not specified. To delete an index syntax:DROP INDEX Table_name.index_name[,table_name.index_name]Description:table_name: The name of the table where the index resides. Index_name: The name of the index to remove. Use system stored procedure:sp_helpindex to view the index information for the specified table. The execution code is as follows:Exec sp_helpindex Book1;15, in the project may encounter this situation, the company will be out of the report, but the b

Java basic interview (1) and java basic interview 1. When I use the final keyword to modify a variable, can the reference not be changed, or can the referenced variable not be changed? When you use the final keyword to modify a variable, it is suggested that the variable cannot be changed, and the content in the object to which the referenced variable points can still be changed. For example, for the follow

Interview Questions: Differences and connections between distributed and cluster, Interview Questions Cluster I. Differences:In a word, distributed systems work in parallel, and clusters work in tandem.1. Distributed refers to the distribution of different services in different places. A cluster refers to the combination of several servers to implement the same service.Every node in the distributed archite

Introduction to common interview pen questions, interview pen questions 1. # include # Include Using namespace std; Void main () { Int c = 5; If (c ++ = 5) { Printf ("% d \ n", c --); Printf ("% d", c ); } Else { Printf ("% d", c ++ ); } System ("pause "); } Answer: 6, 5 2. int x = 3, y = 4, z = 5, t = 2, n = 5; Printf ("% d \ n", (t> 0 )(! (X + y)

C ++ interview questions, interview questions Run the following code: 1 A * pa = new A [10]; 2 delete pa; The constructor and destructor of Class A are executed () times respectively.A.1, 1 B .10, 10 C.1, 10 D.10, 1 Test: # Define _ CRT_SECURE_NO_WARNINGS # include Test results: Because it is delete p rather than delete [] p, only P [0] is parsed.

C/c ++ interview Summary (3) Interview Summary 7. Differences between vector and list (this is also frequently asked)Like arrays, a vector has a continuous memory space and the starting address remains unchanged. This is very efficient for random reads (that is, all our [] operators ), because the memory is continuous. If we want to insert or delete elements, we need to copy and move the current elements. I