face recognition using java

. Calculate 2 times 8 with the most efficient method?A: 2 13. Does the array have the length () method? Does the String have the length () method?Answer: The array does not have the length () method and has the length property. String has the length () method.14. How do I jump out of the current multiple nested loops in Java?A: Before the outermost loop, add a tag such as a, and then use break A; You can jump out of multiple loops. (Support for tagged

threadlocal, Blocking Queue, counting semaphore and concurrenthashmap are more prevalent. 15 Java Multi-threaded face questions and answers 1 Now there are T1, T2, T3 three threads, how do you ensure that T2 after T1 execution, T3 after the implementation of T2 execution? This threading problem is usually asked in the first round or during the phone interview to see if you are familiar with the join met

The system has organized a bit of questions about Java, including Basic, Javaweb, frame, database, multi-threaded, concurrent articles, algorithms and so on, updated in succession. Other aspects such as the front end and so on the face of the questions are also in the collation, there will be.Note: At the end of the article there are benefits!1. String s = new string ("xyz"); how many stringobject have been

Common Java face question questions: What if the Main method is declared private?Answer: Can compile normally, but will prompt "Main method is not public" when run.Question: What is the difference between a reference and a pass in Java?Answer: A pass-through refers to an address rather than the value itself, and a pass value is a copy of the passed value.Question

variables must be part of the class. In addition to the basic data types, the rest are used as class objects, including arrays. Objects combine data and methods to encapsulate them in a class so that each object can implement its own characteristics and behavior. C + + allows functions and variables to be defined as global. In addition, the structure and union in C + + is removed in Java, eliminating unnecessary hassles.Automatic memory managementAll

the two tags, 115. What does the implied object mean? What are the hidden objects?JSP implied objects are some Java objects in the page, and the JSP container allows these Java objects to be used by developers. Developers can use them directly without a clear statement. JSP implicit objects are also called predefined variables. The following lists the implied objects in the JSP page: Application

1. What is generics in Java? What are the benefits of using generics?Generics are a new feature of Java SE 1.5, and the nature of generics is a parameterized type, meaning that the data type being manipulated is specified as a parameter.Benefits:1. Type safety, providing type detection during compilation2, front and rear compatible3, the generalization code, the

Link above: Click to jumpGarbage collector (Garbage collectors)What is the purpose of garbage collection in 35.Java? When does garbage collection take place?The purpose of garbage collection is to identify and discard objects that the app is no longer using to free and reuse resources.What will 36.system.gc () and RUNTIME.GC () do?These two methods are used to prompt the JVM for garbage collection. However,

used by an expression or scriptlet. The added declaration must be wrapped up with the start and end Tags.114. what is an expression?"the list is very long and can be released in the top, middle, and bottom"A JSP expression is a Web server that converts the value of a script language expression into a string object that is inserted into the data stream returned to the Client. The expression is defined between the two tags, 115. what does the implied object mean? What are the hidden objects?JSP i

Java face test-frame eight 71, talk about your understanding of struts. 1. Struts is a web-layer framework designed in the MVC pattern, which is actually a servlet, the servlet named Actionservlet, or a subclass of Actionservlet. We can hand over all requests that meet a feature in the Web.xml file to this servlet, which then refer to a configuration file to assign each request separately to the different

to more of the differences.HashSet in 47.Java, how does the interior work? (Answer answer)The interior of the HashSet is implemented using HashMap. Since the MAP requires key and value, all keys have a default value. Similar to Hashmap,hashset does not allow duplicate keys, only a null key is allowed, meaning that only one null object is allowed in HashSet.48. Write a piece of code to remove an element whi

does not have an entity class corresponding to how to solve?77, introducing Hibernate's Level two cacheWhat is 78,JDO?79,hibernate the difference between a one-to-many and many-to-two associations??How is 80,hibernate delayed loading?Win in the interview of the Java Framework (9)81, what are the benefits of using the spring framework?What is the usual implementation of ApplicationContext? 83, what is sprin

does not have an entity class corresponding to how to solve?77, introducing Hibernate's Level two cacheWhat is 78,JDO?79,hibernate the difference between a one-to-many and many-to-two associations??How is 80,hibernate delayed loading?Win in the interview of the Java Framework (9)81, what are the benefits of using the spring framework?What is the usual implementation of ApplicationContext? 83, what is sprin

through Wait/notify/notifyall, Await/signal/signalall, for example, blocking queues Blockingqueue is designed to share data between 22, how to use the right wait ()? Use if or while? The wait () method should be called in a loop, because when the thread gets to the CPU to start executing, other conditions may not be met, so it is better to have the loop detection condition satisfied before processing. The following is a standard code for using