face recognition using java

permissions for applets? Try to enumerate the ways in which Java application or applets can communicate with servlet/jsp.31. Brief description of logical operations (e.g. ,|) With conditional actions (such as ,| |) The difference.32. Briefly describe the connection and differences between Java Server Page and Servlet.33. Describe the similarities and differences between synchronized and Java.util.concurren

, Spring's efforts have been to reduce complexity, decoupling, and less code.My feeling is that complexity does not come out of thin air, and it does not disappear from thin air, but moves from one place to another.While mastering spring can reduce a lot of unnecessary work, mastering spring itself becomes a complex thing.Spring's XML, annotated configuration, EL expression, the DSL, complicates a lot of simple things and brings more trouble when spring Boot auto-configuration fails.28. Distribu

Object-oriented programming (OOP)Java is a computer programming language that supports concurrency, class-based, and object-oriented. The advantages of object-oriented software development are listed below:• Code development is modular and easier to maintain and modify.• code reuse.• Enhance the reliability and flexibility of your code.• Increase the understandable nature of the code.Object-oriented programming has many important features, such as enc

. Do/while structure at the end of the loop to determine whether the next iteration will continue. The do structure executes at least one loop body.17. Question: What is the locale class?Answer: The locale class is used to dynamically adjust the output of the program according to the locale.18. Question: What is the principle of object-oriented programming?Answer: There are three main points, polymorphism, inheritance and encapsulation.19. Question: Introduction of the principles of successionAn

(Numberformat.getinstance (locale.germany). Format (4032.3f)); // 4.032,3Formatting currencies using the default localeSystem.out.println (Numberformat.getcurrencyinstance (). Format (40324.31f)); // $40,324.31Format currency using locale settingsFormat currency using the Dutch locale:System.out.println (numberformat.getcurrencyinstance ( "NL")). Format (40324.3

, the maximum can be set to the size of memory 70% or 80% of the appearance?? Open the slow query log, add parameters: Log-queries-not-using-indexes, easy to put the system in the index of the SQL statement to fully grasp the optimization?? Query analysis through explain to see if there is no index, the number of rows accessed rows?? Turn off skip_name_resolve to reduce the consumption of reverse DNS resolutionIn addition, there are some actual writin

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 controller invokes the corresponding view to

Not accumulate Kuibu not even thousands of miles, here will continue to collect and update the Java Foundation related questions, currently has collected 100 questions.1. What is the B/s structure? What is the C/s architecture b/S (browser/server), browser/server program c/S (client/server), client/server, desktop applications2. What do you know about network protocols?HTTP: Hypertext Transfer ProtocolFTP: File Transfer ProtocolSMPT: Simp

This part is mainly the open source Java EE framework aspect content, including Hibernate, MyBatis, Spring, Spring mvc and so on, because Struts2 already is the outdated, here does not discuss Struts2 's face question, moreover, This article also provides a simple discussion of enterprise application architectures, large Web site architectures, and application server optimizations, which are believed to be

Tag: Is the console representation of the Loop action Ace callback theory file21. 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. (Java supports tagged break and continue statements that are somewhat similar to goto statements in C and C + +, but like avoiding goto, avoid

121, what is a thread? A thread is the smallest unit that the operating system can perform operations on, which is included in the process and is the actual operating unit of the process. Programmers can use it for multiprocessor programming, and you can speed up operations-intensive tasks using multithreading. For example, if a thread takes 100 milliseconds to complete a task, it takes 10 milliseconds to complete the task with 10 threads.122, what is

class has been provided in the program, and using custom exceptions is meaningless26. The following program runs the result (D)public class Test {public int div (int a, int b) {try {return a/b;}catch (Exception e) {System.out.println ("Exception");}catch (NullPointerException e) {System.out.println ("ArithmeticException");}catch (ArithmeticException e) {System.out.println ("ArithmeticException");} finally {System.out.println ("finally");}return 0;}pu

, how to optimize?Definition of reflection mechanism:is in the running state, for any one class, can know all the properties and methods of this class, any object can be invoked through the reflection mechanism of a class of any method, the dynamic acquisition of class information and the function of dynamic call class object method is called Java reflection mechanism.The effect of reflection:1. Dynamically create an instance of the class, bind the cl

environment because all aspects of it are not synchronized decorated. Therefore, it is also more efficient than stringbuffer.Ii. Java Basics-Collections and ArraysWhat is a 18.Java set 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 collection cla

139. What are 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, t

declaration in Java and is used to declare a variable that is subsequently used by an expression or scriptlet. The added declaration must be wrapped up with the start and end tags.114. What is an expression?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

related to link1 Byid related to IDTwo Byxpath and Bycssselector left.My most common thing byxpath (or cssselector) because in many cases, HTML tag properties are not well-regulated and cannot be located by a single attribute, this time only using XPath can be used to re-implement the positioning of the unique elementIn fact the fastest positioning should belong to Byid, because the ID is unique, but most developers do not set the ID5. Where to go to

1.GC What's that? Why is there a GC?GC is the meaning of garbage collection (Gabage Collection), memory processing is where programmers are prone to problems, forgetting or wrong memory recycling can cause program or system instability or even crashes, The GC functionality provided by Java can automatically monitor whether an object exceeds the scope to achieve the purpose of automatically reclaiming memory, and the

requestedJsp:usebean Find or instantiate a JavaBeanJsp:setproperty Setting properties for JavaBeanJsjp:getproperty output the properties of a JavaBeanJsp:forward forwardingJsp:plugin generates an OBJECT tag for a Java plug-in based on browser type7. The difference between GET and POSTThe Get and post methods in the form, respectively, correspond to the Get and post methods in the HTTP protocol during data transmission.Get is used to fetch data from t

elements in the list. So its performance is O (1). Example 2: The performance of a linear search for an array or list is O (n), because we need to iterate through all the elements to find the elements we need.40. What are the best practices related to the Java collection framework? (1) Select the correct collection type as needed. For example, if you specify a size, we will choose an array instead of a ArrayList. If we want to traverse a map in order