java interview questions multiple choice

MVC (view-model-Controller) design pattern.12. What is the difference between the pop-up selection menu (Choice) and the list?The choice is presented in a compact form that requires a drop-down to see all the options. Only one option can be selected at a time in choice. List can have multiple elements visible at the s

-synchronization, using atomic classes (atomic concurrent classes), implementing concurrent locks, using the volatile keyword, and using immutable classes and thread-safe classes. You can learn more in the thread safety tutorial. How does the volatile keyword work in Java? When we use the volatile keyword to modify a variable, the thread will read the variable directly and not cache it. This ensures that the variables read by the thread are consistent

Dark Horse programmer ---- java-based operators, keyboard input, if switch statements, related Interview Questions, ---- javaswitch ------ Java training, Android training, iOS training, and. Net training. We look forward to communicating with you! ------- 1: Operator (master)(1) Arithmetic Operators A: +,-, *,/, %, ++

. 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

Job-hopping is not frequent, but has participated in a lot of interviews (telephone interview, face to faces interview), large/small companies, Internet/traditional software company, batter (above his business, lack of actual combat experience, hang off), also face, fortunately not because of failure and discouraged, in the process of constantly check gaps, developed a practical, Trace, continuous improveme

Java Algorithm interview questions: What are the methods for sorting? List. Use JAVA to implement a fast sorting. Select bubble quick set to sort by at least four methods, java Algorithm Package com. swift; import java. util. arra

implemented by another internal class.Third, the difference between static nested class and inner class is that the more you say, the better (the more general the interview questions are ).Nested class (generally C ++) and inner class (generally Java ). The biggest difference between Java internal classes and C ++ Nes

., 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

understand the process of solving the problem, and find out what the individual has done, how to do, and what has been harvested. This is the accumulation of experience. The company ultimately needs to contribute to the work of the staff, so the need for experienced people to help solve the problem, then the ability to solve problems and thinking is very important. For students who do not have much experience, such as a new graduate or an intern, then they need a good foundation and some person

Summary and Induction of JAVA interview questions of Niuke Network (1), Niuke javaPreface Today, I saw an article on explaining the Spring framework in the Nuggets. The article mentioned Niu Ke's interview questions. As a result, I downloaded the Niuke web app and found that

First, let's talk about the differences among final, finally, and finalize. Second, can Anonymous Inner Class (Anonymous internal Class) be extends (inherited) other classes, or implements (implemented) interface (interface )? Third, the difference between Static Nested Class and Inner Class is that the more you say, the better (the more general the interview questions are ). Fourth, the difference between

Lock, Object lock, class lock?40. What happens if a thread inside a synchronization block throws an exception?41. What is the difference between concurrent programming (concurrency) parallel programming (parallellism)?42, how to ensure that the results of multi-threaded i++ correct?43. What happens to a thread if a run-time exception occurs?44. How do I share data between two threads?45. What is the role of the producer consumer model?46, how to wake up a blocked thread?47. What is the thread s

The Java Collection framework is the foundation of the Java programming language and is an important knowledge point in the Java interview. Here, I've listed some important questions and answers about the Java collection.In additi

The Java Collection framework is the foundation of the Java programming language and is an important knowledge point in the Java interview. Here, I've listed some important questions and answers about the Java collection.In additi

corresponding action, while the user's data to fill the corresponding actionform, and then the Actionform is distributed to action for processing.3.Action automatically calls the Excute method, in which the action takes the user-filled data from the Actionform and invokes the model (JavaBean) for processing, and then displays the results of the processing in a different view (JSP page)struts-config.xml:struts 's configuration file .It says that each user's request is handled and forwarded throu

　 The Java Collection Framework is the most frequently asked question of Java interviewing, and it is necessary to understand the powerful features of Java technology to master the set framework. Here are some practical questions, often asked in the core Java

Java interview question Summary 2 (Continuous updates), java questions 1. How to format a date Answer:Date now = new Date (); SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd hh: mm: ss "); String formatNow = sdf. format (now ); The formatNow variable is the formatted date. 2. What are several implementation m

Java Collection related interview questions and answers Interview questions1.JavaWhat is a collection frame? What are some of the advantages of a collection framework? There are collections in each programming language, and the original Java version contains several collect

115 Java Interview Questions and answers-ultimate list (I), 115 java This article will discuss various types of interview questions in Java interviews, which allow employers to test ca

system quickly fails to make a false error alarm immediately. In Java, quick failures are related to iterators. If a iterator is created on the collection object, other threads are "structured" to modify the collection object, and the concurrent Modification exception (Concurrentmodificationexception) is thrown.8, how to make HashMap synchronization?The HASHMAP can be synchronized by using map m = Collections.synchronizedmap (HASHMAP).9, when to use