java scenario based interview questions

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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 u

object is accessed, nullpointerexception is thrown. Another scenario is that Java allows programmers to extend this semantic check. programmers can create their own exceptions and choose when to use the throw keyword to cause exceptions. All exceptions are subclasses of Java. Lang. thowable. 3. What is the difference between sleep () and wait?A: Sleep () is a th

Some days ago, I wrote an article in the blog Park, how to introduce my project experience in the interview, Harvest more than 2000 clicks, which undoubtedly inspired me to continue to share the enthusiasm, today I come to share another interview can even help everyone to reverse the skills, this article is from the Java Web Lightweight Development

Java Internet for interview-Message Queuing-application scenario 1 Asynchronous processing Scene Description: After the user registers, needs to send the registration mail and the registration message. The traditional approach has two kinds of 1 serial ways; 2. Parallel mode. (1) Serial mode: The registration information will be written to the database after th

. JavaScript Common objects6, commonly used in JavaScript value assignment method, for radio button, check box, such as the value assignment method. (Baidu can, JavaScript common basis)7, jquery value Assignment Basic method.8. Get the value of the radio button, get the value of the check box, get the value of the drop-down list, go to the value of the check box, get the value of the radio button Group, text box, text field assignment.9, the Append of jquery and appendto difference.10, the CSS B

of the lock interface in Java than the synchronized block? You need to implement an efficient cache that allows multiple users to read, but only one user is allowed to write in order to maintain its integrity, how will you implement it?The biggest advantage of the lock interface in multi-threaded and concurrent programming is that they provide a lock for both read and write, which satisfies high-performance data structures and conditional blocking th

execution.Surround notification is one of the most common types of notifications. Most interception-based AOP frameworks, such as Nanning and JBOSS4, provide only surround notifications.The concept of pointcut (pointcut) and connection point matching is the key to AOP, which makes AOP different from other old technologies that simply provide interception functionality.The pointcut enables the location notification (advice) to be independent of the OO

databaseHibernate's first-level cache is provided by the session, so it only exists in the session's lifetime, when the program calls save (), update (), Saveorupdate (), and calls the query interface List,filter, Iterate, if there are no corresponding objects in the session cache, hibernate will add the object to the first level cache and the cache will disappear when the session is closed.Hibernate's first-level cache is built into the session, cannot be uninstalled, and can not be configured

Java interview questions, java questions1. simple principles and applications of the Exception Handling Mechanism in C ++ or Java.When a JAVA program violates the JAVA Semantic Rules, the JAVA