face recognition using java

Java face test-frame nine 81, what are the benefits of using the spring framework? Lightweight: Spring is lightweight, the basic version is about 2MB. Control reversal: Spring enables loose coupling through control inversion, and objects give them dependencies, rather than creating or locating dependent objects. Aspect-oriented programming (AOP): Spring supports

string object is required for each different string. At this point, you should consider using the StringBuffer class, which allows you to modify instead of creating a new object for each different string. Also, the conversion of these two kinds of objects is very easy. 3. can a string be inherited? No, because string is similar to the final class .4. strings=new string ("xyz"); How many string objects are created? Two or one, "xyz" corresponds to an

Java face test questions-generic article 14 139. What is generics in Java? What are the benefits of using generics? Generics are a new feature of the Java SE 1.5, the essence of which is a parameterized type, which means that the data type being manipulated is specified as

. Part 3:persistence and CLI are used with BOLTDB, which is better for go language support.Recommend a Java in-house learning Group: 725633148, the group to find management free to receive learning materials and videos. Nothing wrong is free to collect! Big man small white are welcome, we learn together progress together!But we are using Java to implement, BOLTDB

1, to finalize the understanding:The finalize- method name. is part of the operating mechanism of the GC operation, and the Finalize method is called when the GC operation is performed. Java technology allows use Finalize () method to do the necessary cleanup before the garbage collector clears the object from memory. This method is called by the garbage collector to this object when it determines that the object is not referenced. It is defined in th

precipitous start, asking some tricky questions about the details of HashMap's more basic. The interviewer may ask the following questions:"Do you know how HashMap works?" "Do you know how the HashMap get () method works?" ”You may be able to answer, "I didn't look up the standard Java API, you can look at Java source code or open JDK." "I can use Google to find the answer." ” But some interviewers might b

? Session interface: A CRUD operation that is responsible for persisting objects. Session is a first-level cache, lightweight, thread insecure.Sessionfactory interface: Responsible for initializing hibernate, which acts as a proxy for the data storage source, and is responsible for creating session objects, which are used in Factory mode, Sessionfactory is a level two cache, heavyweight.Configuration Interface: Responsible for configuring and starting Hibernate, creating Sessionfactory objects.

high concurrency strategy)Backstage: (Managing objects)Front end: CSS HTML js jqueryBack end: Springmvc Spring MyBatisDatabase: MySQLPicture Separation frame: Jersey23. What is restful (representation State transformation) architecture?(1) Each URI represents a resource;(2) between the client and the server, the transmission of such resources of some kind of performance layer;(3) The client through four HTTP verbs, the server-side resources to operate, to achieve "performance layer State transf

Java face test list for first-line internet companyJava Key knowledge Multithreading (thread state, thread concurrency, synchronized and lock differences and underlying principles, commonly used locks and their use of scenes and principles, Volatile and threadlocal solve the problem, the implementation of CAs in Java Thread pooling principles and implementations

back. c) Consistency: Things are in a consistent state before and after they are executed D) Persistence: the operation of a thing with multiple data is permanent E) Isolation: When a thing is working on the data, another thing can not manipulate the data, that is, multiple concurrent things are isolated from each other. 28. Struts Work Flow A) The client sends a request to the servlet container b) The request passes through some column filtering by Filterdispatcher call, Filterdispatch through

configuration file) Why did the author name This here the input property instead of the error attribute?④action after execution, to return to the result view, this result view is represented by a Actionforward object, The Actionforward object is associated to a JSP page by configuration in the Struts-config.xml configuration file because the program uses the logical name set for the JSP page in the Struts-config.xml configuration file, which enables the action program code to be implemented wit

java face test-persistence layer 10 91, what is ORM.Object-Relational mapping (object-relational Mapping, or ORM) is a technique to solve the problem of mismatch between the object-oriented model of program and database; To put it simply, ORM is to automatically persist objects in a program to relational databases or to convert rows from relational database tables into

suspend all other worker threads (user threads) when it is garbage collected. Is the default new generation collector in JVM client mode. For environments that limit a single CPU, the serial collector is naturally able to achieve the highest single-threaded collection efficiency due to the lack of thread interaction overhead.Parnew (parallel GC) collectorIf you want to learn Java engineering, high performance and distributed, in Layman's. Micro-servi

Java Background development face test Java basic JVM related JUC concurrency related Spring distributed correlation algorithm data structure design pattern database Redis cache related network related other Java Basics Arrays.sort realization principle and collection realization principleThe difference between a foreac

Java is an object-oriented design language, so exceptions are encapsulated in Java, and we just have to know how to handle exceptions.Exceptions overviewException: An exception is an error that occurs while the Java program is running.Exception Origin: The problem is also a real life of a specific transaction, can also be described in the form of

, and the data is not converted, and these classes are subclasses of InputStream and OutputStream.Character-oriented operations manipulate data in characters, convert binary data to characters at read time, and convert characters to binary data when writing, which are subclasses of reader and writer.Summary: The InputStream (input)/outputstream (output) is the suffix of the byte stream;The word stream is the suffix of reader (input)/writer (output).Extension:

starts, it reads the Web. xml file in all of the WebApps directories, and then parses and reads the servlet registration information. The servlet classes that are registered in each app are then loaded and instantiated in a reflection manner. (sometimes also instantiated on first request)When a servlet is registered, add Java bosom friend of the public to organize some of the major companies commonly used to interview pen questions, for everyone in t

we don't want to repeat, we should use set. (2) Some collection classes allow the initial capacity to be specified, so if we can estimate the number of storage elements, we could use it to avoid a hash or resize. (3) Based on interface programming, rather than on implementation programming, it allows us to easily change implementations later. (4) Always use type-safe generics to avoid classcastexception at run time. (5) using the immutable class

client code that invokes the method Makearray: A calls the Makearray method to get the array, B joins the elements into the array, C iterates through the array, and outputs all the element foo.3). Explains how linkedlist and vectors are different for storing foo.4.java method parameter passing, under what circumstances is the value of the pass-through, what is the difference between these two ways?5. Describe the relationship between classes/interfac

LinkedList, and if you need to quickly randomly access elements, you should use ArrayList. If the program is in a single-threaded environment, or if access is done only in one thread, it is more efficient to consider non-synchronous classes, and if multiple threads may operate on a class at the same time, the synchronized classes should be used. Pay special attention to the operation of the hash table, and the object as key should correctly replicate the Equals and Hashcode methods.