face recognition using java

the runtime polymorphism16. What is hibernate lazy loading? Why should I use lazy loading?The so-called lazy loading, is delayed loading or delayed loading.When the amount of data we access is too large, obviously the cache is inappropriate, because the content capacity is limited, in order to reduce the concurrency, reduce the consumption of system resources, we let the data when needed to load, then we use lazy loading.Hibernate provides lazy loading of propertiesA. Lazy loading of entity obj

the stored record has a value of two, or because it stores a null value;8. After a week, the project manager assigned the task to you, the content of the task is to add a new * * function for an existing module , it is expected that you two days after the completion, but the actual implementation of the process you have completed the task in one day, What do you plan to do for the rest of the day? 9. which project has the greatest harvest in the past work? What is the harvest? What kind of role

First, the choice questionThe encoding format used internally by 1.java is C, Unicode, which is used uniformly within the JVM, using Unicode representation.2.Public class Threads2 Implements runnable{Public void run () {System. Out.println ("run.");throw New RuntimeException ("problem");}Public static void Main (String[] args) {thread t = new thread (new Threads2 ());T.start ();System. Out.println ("End of

parent class is overwritten.6. The difference between Collection and collections(1) collection is the ancestor interface of the collection class, and the main interface of inheriting with him is set and list.(2) Collections is a helper class for a collection class that provides a series of static methods for searching, sorting, threading, and so on for various collections.7.Java anomalies (including exception and error) are categorized as checked exc

1) Design a Java program, customize the Exception class, enter a string from the keyboard, if the string value is "ABC", throw exception information, if you enter from the keyboard other strings, do not throw an exception.Import Java.util.Scanner;Class MyException extends exception{Private String errormsg;Getter and Setter methodsPublic myexception (String errormsg) {this.errormsg=errormsg;}@OverridePublic String toString () {return errormsg;}}public

function explicitly.The garbage collector can only reclaim memory that is used by objects created by the new keyword, and some of the memory that is used in this way (such as calling C + + local methods) is recycled. Then you need to use Finalize (). Because the free () function is required to release memory in C + +, the Java program calls the Finalize () method to free memory when calling C + +.9. List and briefly explain several common garbage col

}SYSTEM.OUT.PRINTLN ("y=" + y),//Y or 0, no self-increment}public static void method4 (int x, int y) {if ((x = =) (++y) Gt 0) {//null operation}SYSTEM.OUT.PRINTLN ("y=" + y);//Y becomes 1, since the increase, indicating that although x==33 is not established, but ++y the execution of the!!! }public static void Method5 () {int b = 0x0f;//16 is automatically converted to decimal int c = 0x31;//16 is automatically converted to decimal int d = b c;//bitwise AND operation (computer will eventually

() }, "JSON", success:function (data) { $ ("#login"). Text (json.stringify (data)); // this is where the string is encapsulated into a JSON object form }, error:function (data) { // return failure prompt } }) ; Advantages:1. The biggest point is that the page has no refresh and gives the user a very good experience.2. Use asynchronous to communicate with the server, do not need to interrupt the user operation, have more rapid response

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

with a short code. Convert multiple spaces to a space (5 points)String s = "s tr in G";S=s.replaceall ("+", "");7. Using the socket to write a program, the client sends a request to the server side (to send a string), the service side to send feedback information. (10 points)TCP protocolOnline examples many find themselves. Code too long8. Implement Oracle paging queries with SQL statements. (10 points)SELECT * FROM (select ROWNUM rn,t.* from TableNa

Yes, but even if you write this class, it doesn't work.This issue involves the delegate mechanism of the loader, in the class loader's structure diagram (below),Bootstrap is the top-level parent class, Extclassloader is a subclass of the Bootstrap class, and Extclassloader is also the parent of AppclassloaderHere in java.lang.String, for example, when I use this class, the Java virtual Opportunity loads the bytecode of the Java.lang.String class into

corresponding interceptor), ⑧ the data object into the level two cache; ⑨ returns the data object. What is the difference between the list method and the iterate method of the 14.Query interface? A: Each object returned by the ①list () method is complete (each property in the object is populated with a field in the table), the list method cannot take advantage of the cache, it is write-only to the first-level cache, and the ②iterate method can take full advantage of the first-level cache, which

corresponding interceptor), ⑧ the data object into the level two cache; ⑨ returns the data object. What is the difference between the list method and the iterate method of the 14.Query interface? A: Each object returned by the ①list () method is complete (each property in the object is populated with a field in the table), the list method cannot take advantage of the cache, it is write-only to the first-level cache, and the ②iterate method can take full advantage of the first-level cache, which

used. In summary, an instance variable must be created before it can be used by the object, and a static variable can be referenced directly using the class name.For 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 instancev

IOC in spring?What is di?For:IOC is control reversal, so-called inversion refers to the application itself is not responsible for the creation and maintenance of dependent objects, and this task to the third party is the spring to deal with, this is the right to create objects to the third party, control reversal is the transfer of control rightsdi is a dependency injection. Dependency injection, the spring dynamically injects dependent objects into the component during execution.When the IOC c

Preface Today, in the Nuggets, I saw an article about the spring framework for the presentation, which referred to the face test of the cow net. So I downloaded the Cattle Network app, found the interview topic is very rich. I chose the Java aspect of the face test to do a bit. 10 topics for a group of interview questions, finished, I found myself a lot of wrong

with this.Superuse super in the Java class to refer to the composition of the parent class, use this to refer to the current object , and if a class inherits from another class, when we new the instance object of the subclass, there will be a parent class object inside the subclass object. How do you refer to the parent object inside? Using Super to refer to, this refers to a reference to the current objec

threadsClass Demo implements Runnable{public void Run () {for (int i = 0;ipublic class Main{public static void Main (string[] args) throws Exception{new thread ()//Line Cheng Zi class {public void Run () {for (int i = 0;iMulti-threaded interview questions:1.Class Text implements Runnable{public void Run (Thread t) {}}//failed to compile? What is the hypothetical failure error?failed with overwrite of Run method not implementedChange Law One:Abstract class Text implements Runnable{public void Ru

1.Java ArrayList time Elapsed Delete elementThe key to the problem is whether the interviewer is using the ArrayList remove () or the Iterator remove () method. is to use the correct way to implement the sample code that removes the element during traversal without the concurrentmodificationexception exception.When we traverse the ArrayList, we need to delete the element that satisfies the condition, and th

-interface or implementation class of collection. Map is an interface.Each Entry in 2.Map holds two objects, which is a key value, and Map may hold the same value object but the key object must be unique.3. TreeMap also maintains a sort order by Comparator or comparable.4. You can have a random null value in Map, but there can be at most one null key. Some of the most popular implementations of the 5.Map interface are HashMap, Linkedhashmap, Hashtable, and TreeMap. (HashMap, TreeMap most commonl