face recognition using java

client is requested to save the Cookie value, and the subsequent request to the same server uses aThe Cookie header returns it to the server. Compared to other technologies, one of the advantages of cookies is that after the end of a browser session, evenIt can still retain its value after the client computer restarts. See: http://blog.csdn.net/xh16319/article/details/84643194). Session: Bind an object to a session using the SetAttribute (String str,

First, the Java Foundation1. What do you know about Java modifiers and their respective usage mechanisms? (Public, abstract, final, synchronized, super ...) ）01.public: Allow all customers to access02.protected: Used only in this package, in this class, and in subclasses of the class03.private: Only allowed in this class04.abstract: No implementation is provided and the subclass is required to provide the i

do I ensure that n threads can access n resources without causing a deadlock?When using multithreading, a very simple way to avoid deadlocks is to specify the order in which locks are acquired and force threads to acquire locks in the order specified. Therefore, if all the threads lock and release the lock in the same order, there will be no deadlock.such as resource ABCD, that all threads must acquire a resource to apply for B resources, and so on10

31. String s = new string ("xyz"); how many stringobject have been created? Can I inherit the String class?Two or one is possible, "XYZ" corresponds to an object, the object is placed in a string constant buffer, and the constant "XYZ" is the one in the buffer, no matter how many times it occurs. NewString creates a new object every time it is written, it creates a new string object using the contents of the constant "XYZ" object. If ' xyz ' had been

longer needed, but because long-life-cycle objects hold their references and cannot be recycled, this is where memory leaks occur in Java, in layman's words, Is that the programmer might have created an object that would never be used in the future, and this object has been referenced, that is, the object is useless but cannot be reclaimed by the garbage collector, which is a possible memory leak in Java,

is the ability to create and modify XML documents using Java programming Capabilities.The above XML interview questions are collected from many programmers, but they are useful to everyone who uses XML technology. XML is becoming more and more important because of its platform independence, and XML is widely used for cross-platform data transmission (xpath,xslt,xquery). Although XML has drawbacks such as r

the Object class, so all of the classes inherit it. Subclasses override the Finalize () method to defragment system resources or perform other cleanup work. The Finalize () method is invoked on this object before the garbage collector deletes the object. Second, Anonymous Inner class (anonymous inner Class) can extends (inherit) other classes, can implements (implement) interface (interface)? An anonymous inner class is an inner class without a name. You cannot extends (inherit) other classes,

Java face question ($) 1. Describe the banking business you are familiar with, the more detailed the betterBanking Experience: Mobile banking Online Banking Experience How to pay Transfer understand the basic business2, understand the control of workflow, approval process and accounting processing?How to implement workflow, approval process in Java, How does

. Because indexes require additional storage space and processing, those unnecessary indexes can slow query response time. It is necessary to periodically refactor the index.:ALTER INDEX 18) Replace distinct with exists:Avoid using DISTINCT in the SELECT clause when submitting a query that contains one-to-many table information, such as a departmental table and an employee table. It is generally possible to consider replacing with exist, EXISTS makes

in Java code!(21) Avoid using not on indexed columns typically,We want to avoid using not on indexed columns, and not to have the same effect as using functions on indexed columns. When Oracle "encounters" not, he stops using the index instead of performing a full-table sca

to invoke the object's notify () method, it releases the lock on the object so that other waiting threads can get the object lock. Since all of these methods require a thread to hold the lock on the object, this can only be done by synchronization, so they can only be called in a synchronous method or in a synchronous block.15. Why is the sleep () and yield () method of the thread class static?The sleep () and yield () methods of the thread class will run on the currently executing thread. So i

container, and the interceptor does not depend on the servlet container3. Interceptors only work on action requests, while filters can work on almost all requests4. The interceptor can access the action context, the object in the value stack, and the filter cannot5, in the life cycle of the action, the interceptor can be called multiple times, and the filter is only called once when the container is initializedInterceptors: Is programming in the face

object can catch the exception and handle it. Java exception handling is achieved through 5 keywords: try, catch, throw, throws, and finally. OneThe case is a try to execute a program, if an exception occurs, the system throws (throws) an exception, then you can use its type to catch (catch) it, or finally (finally) by the default processor to handle;A try is used to designate a piece of program that prevents all "exceptions";The catch clause immedia

example, for the following program, no matter how many instance objects are created, only one Staticvar variable is always assigned, and each instance object is created, the Staticvar adds 1; However, each instance object is created, a Instancevar is assigned. That is, multiple instancevar may be assigned, and each Instancevar value is only added 1 times.public class varianttest{ publicstatic int staticvar = 0; Publicint instancevar = 0; Publicvarianttest () {

1. Can I include more than one class (not an inner class) in a ". Java" source file? What are the restrictions?A: Yes, but there can only be one public class and if there is a public class, the name of the file should be the same as the name of the class.2. Does Java have goto?A: Reserved words in Java are not currently used in Java3. Tell me the difference betwe

consider using the StringBuffer class directly when you need to append strings. Reference answer:The String class is an immutable class, where the string value cannot be changed once it is initialized. StringBuffer is a mutable string class, string-like buffer that can modify the value of a string .3 The difference between StringBuffer and StringbiulderStringBuffer is a thread-safe string buffer, and StringBuilder is not thread-safe .4 wrapper type?T

improves the reusability of the application Controller: When the user clicks the Submit button in the Web page, the controller accepts the request and invokes the appropriate model to process the request. The corresponding view is then called according to the result of the processing to display the results of the processing. MVC process: First the controller accepts the user's request, invokes the corresponding model for business processing, and returns the data to the controller. The

These days of Java training class, constantly wake up their understanding of Java (too long, the University of the Quick Forget clean), some of the interesting questions, are in the Java details (alas, I am the kind of people who see the pit on the jump, a Do wrong), the following to share:1) write in Java program when

Java face test-multithreaded article 13 121, what is the thread. A thread is the smallest unit of operation that the operating system can perform, which is included in the process and is the actual unit of operation in the process. Programmers can do multiprocessor programming through it, and you can use multithreading to speed up compute-intensive tasks. For example, if a thread completes a task for 100

, does not exist, throws an exception-Requires_new Always Create new transactions-Not_supported The presence of a transaction is suspended, and a non-transactional operation has been performed-Never always executes non-transactional and throws an exception if a transaction is currently present-Nested embedded transaction15. What is a di mechanism? Dependency Injection (Dependecy injection) and control inversion (inversion of controls) are the same concept, specifically: when a role requires anot