face recognition java

The difference between ArrayList and LinkedListDo you know optimistic lock, pessimistic lock? Under what circumstances are you pessimistic with optimism?The role of the volatile keywordIs the i++ atomic?Continue to cross-examine the memory modelWhy to set up working memory and main memoryRemember that the JVM book has a working memory analogy to the processor cache, so that's what it says.Let's just say the GC process.Just said the new generation of memory recycling is interrupted. Say that you

Java provides the wrapper type for each primitive type:-Original type: boolean,char,byte,short,int,long,float,double-Package Type: boolean,character,byte,short,integer,long,float,doubleCase one:classAutounboxingtest { Public Static voidMain (string[] args) {Integer a=NewInteger (3); Integer b=3;//automatically boxing 3 into an integer type intc =3; System. out. println (A = = B);//false Two references do not reference the same objectSystem. out

public class Main {public static class Mycallable implements callablePublic Integer Call () throws Exception {return 1;} }public static void Main (string[] args) {mycallable callable=new mycallable (); futuretaskthread t=new Thread (Task); try {t.start (); System.out.println (Task.get ()); } catch (Interruptedexception e) {//TODO Auto-generated catch blocke.printstacktrace (); } catch (Executionexception e) {//TODO auto-generated catch blocke.printstacktrace (); } }Operating system allocation t

external classes, and cannot access non-static members of external classes.② member inner classes are free to reference external member variables and methods (including private)③ local inner classes cannot be modified by permissions modifiers such as public and static④ Anonymous inner classes cannot use class, extends, implements, no constructors, must inherit classes, or implement interfaces, thus creating only one anonymous inner class instance. In addition, local inner class constraints also

Time limit: 1 seconds Space limit: 32768K Topic Description The number that contains only the factors 2, 3, and 5 is called the Ugly number (Ugly numbers). For example, 6, 8 are ugly numbers, but 14 is not, because it contains factor 7. We used to think of 1 as the first ugly number. Find the nth ugly number in order from small to large.Import Java.util.arraylist;public class Solution {public int getuglynumber_solution (int index) {/* timed out: int ugly=0; int COUNT=1;//1 is the f

3, A, B, c three people playing cards, played a total of 100, the results of each disk are saved in the score table. Please use SQL The statement identifies the maximum score of each of the three people in which innings, the output bureau number and the highest score. Field name Property Note Id Int ( self-increment ) Bureau number Optiona Int The results of armour Optionb Int B's Results

-order traversal of the following two-fork trees are written:3. What's wrong with the following procedure?public class Something{public static void Main (string[] args) {SomeThing s=new SomeThing (); System.out.println ("The S.dosomething () is" +dosomething ());} Public String dosomething () {return ' do something ';}}4. Insert sort and bubble sort which is good, why?5. What are the output results of the following programs?public class Test{public static int y=8;public staitic void main (string

implementation), they all complete the map interface, the main difference is that the HASHMAP allows null (NULL) key value (key), because of non-thread security, in the case of only one thread access, More efficient than Hashtable.HashMap allows NULL to be used as a entry key or value, and Hashtable is not allowed.HashMap hashtable contains method removed, changed to Containsvalue and ContainsKey. Because the contains method is easy to cause misunderstanding.Hashtable inherits from the dictiona

) {e.printstacktrace (); } } } } After the run, the print results become ACBACB. To avoid this uncertainty related to JVM scheduling. The a,b,c three threads need to be started in a certain order, with the final code as follows: Public classMyThreadPrinter2ImplementsRunnable {PrivateString name; PrivateObject prev; PrivateObject Self; PrivateMyThreadPrinter2 (String name, Object prev, object self) { This. Name =name; This. prev =prev; This. Self =Self ; } @Overrid

daemon thread? What's the use?22, how to interrupt a thread? How to ensure the interruption of business is not affected?23. What is the yield () method used for?24. What is the difference between a re-entry lock and a synchronized lock?25. What kinds of usages do synchronized have?26. What does the Fork/join framework do?27, how to pass parameters to the thread?28. Talk about thread-safe and unsafe collections.29, what is the CAS algorithm? What are the applications in multi-threading.30. What

Java array face questions ask. 5 Which of the following array definitions is wrong. and add a single-line comment to the wrong answer and write the reason for the error. A,float[]=new Float[3]; B, float f2[]=new float[]; C, float[] f1=new float[3];. D, boolean[] b={"true", "false", "true"};. E, double f4[]={1,3,5}; F, int f5[]=new int[3]{2,3,4}; G, float f4[]={1.2,3.0,5.4}; Collect 188****0365 | Browse 415

Js|server How to use Java Server Face (JFS) in Eclipse+myeclipse: Create a JSF project based on MyEclipse's introduction to the JSF Creation wizard. The details are as follows: 1.J2EE's WEB Project Project creation 2. Add JSF packages to the project (adding JSF capabilities to a WEB project) create the related packages and configuration files. 3. Add JFS page (a special format file in JSP) Note: There are g

creating thread objects and saves system resources. Just like the original to the cafeteria to play rice is everyone to see who Rob Win, who first grab who first eat, have a thread after eating, is lined up, today I have a good relationship with you, you first come to dinner. For example: An application to work with the network, there are many steps need to access the network, in order not to block the main thread, each step to create threads, in-line and network interaction, with the thread po

must implement, on the other hand, it can define the default method body for the subclasses to use or overwrite directly. In addition, it can define its own instance variables for use by subclasses through inheritance. Applications for 3.interfaceA. Classes and classes require a specific interface to reconcile, rather than how they are implemented.B. As an identity that is capable of implementing a specific function, it can also be a purely identifying interface method that does not exist.C. Th

know where this erroneous thinking from.16.public interface Set Look at the document.22. "An abstract class can inherit an entity class, but only if the entity class must have a clear constructor." "What do you mean, who rules?"27. This is more complex, such aspublic class Main {public static void Main (string[] args) {SYSTEM.OUT.PRINTLN (Test ());}public static Boolean test () {Boolean B = false;try {return B = 4 > 3;} finally {System.out.println (b);return false;}}}As can be seen in this exam

instantiated bean is configured according to the spring context, which is the IOC injection.If the bean implements the Beannameaware interface, it invokes the Setbeanname (String Beanid) method It implements, which is passed the ID of the bean in the spring configuration file.If the bean implements the Beanfactoryaware interface, it invokes the setbeanfactory () that it implements, passing the spring factory itself (which can be obtained in this way to other beans).If the bean implements the Ap

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

technology or a platform or a framework? The Java EE itself is a standard, a standard platform for the development of enterprise distributed applications.The Java EE is also a framework, including JDBC,JNDI,RMI,JMS,EJB,JTA and other technologies 6: How do I jump out of the current multiple nested loops in Java? In Java