face recognition using java

, enjoy the meta-mode.There are 11 types of behavioral Patterns: Strategy mode, template method mode, observer mode, iteration sub-mode, responsibility chain mode, Command mode, Memo mode, state mode, visitor mode, mediator mode, interpreter mode.How Java calls C, C + + language;interface and callback; the principle of callback; Write a callback demo;Generic principles, examples, analysis and dispatch;The difference between abstract class and interfac

1. What is the difference between equals and = =?　　= = Determines whether two variables or instances are pointing to the same memory addressEquals is to determine whether the values in the memory address pointed to by two variables or instances are the same2. What are the common methods of object?　　Method Equals () tests whether two objects are equalMethod Clone () for object copyMethod GetClass () Returns the class object associated with the current objectMethod Notify (), Notifyall (), wait ()

answer is before return, but to be more granular, it should be done in the middle of return.Take a look at the running results of the following program code:public class Test {public static void Main (string[] args) {SYSTEM.OUT.PRINTLN (Test ());} static int test() { int x = 1; try { return x; } finally { ++x; } } } ---------执行结果 --------- 1 运行结果是1，为什么呢？主函数调用子函数并得到结果的过程，好比主函数准备一个空罐子，当子函数要返回结

The red check for exceptions is whether eclipse will prompt you for a try catch or throws.Non-check exception is/0,nullpointexception, data out-of-bounds access Indexofoutbounds exceptionError: The most common oom error, as well as Classnotfoundeerror,stackoverflowerror :The question generalization of Java exception processing surface1. What is the difference between error and exception?Error indicates system-level errors, is a

mode.In fact, there are two types: concurrency mode and thread pool mode.Most familiar: single-instance modeA singleton object (Singleton) is a common design pattern. In Java applications, singleton objects guarantee that only one instance of the object exists in a JVM.4.describe some of the special features you would like to implement from what package? Java.util is the Java Utility Toolkit, which contain

this iterator is generated by the collection class through the factory method.Each collection class may return different iterator specific types, but they all implement the iterator interface, so we don't need to care what kind of iterator it is, it just needs to get the iterator interface, which is the benefit of the interface, the power of object-oriented.To ensure that the traversal process is complete, you must ensure that the contents of the collection are not changed during traversal (exc

TwoHow to create a thread:(There is a third way, you can understand it in Baidu itself)A. Inheriting the Thread classInherit the thread, then rewrite the Run method, use the new object directly, and then call the start () method, and the thread is turned on.B. Implementing the Runnable InterfaceClass A implements the Runnable interface, overriding the Run method, using the object A with new out of a, and the object in the new thread with a as its arg

One, the difference between vector and ArrayList1,vector is thread-synchronized, so it is thread-safe, and ArrayList is thread-asynchronous and unsafe. If the thread security factors are not taken into account, the ArrayList efficiency is generally higher.2, if the number of elements in the collection is greater than the length of the current collection array, the vector growth rate is 100% of the current array length, while the ArrayList growth rate is 50% of the current array length. Vector ha

Description: The content of this article is to read the "deep understanding of Java Virtual Machine: JVM advanced features and best practices" to add to the impression and understanding, then recorded the important content. 1 straight to the pointI used to see a Java face test, but I thought it was simple, but I ran the code, but the result was not what I imagine

As a junior students, will soon go to internship, but always feel that they even a beginner novice is inferior, hey. Found himself even the threshold of the programmer has not entered, a little sad, but sad useless, hard forward is what we should do now.Here are some of the Java-based questions I have previously extracted from the Internet at school. Just as usual review, deepen their knowledge level, no other use.Say Arraylist,vector, LinkedList's st

verification) We understand the role of this module as a facet, telling us that it is a functional module. We can think of it as a facet. To put it bluntly, we write a class. Write a method in this class that deals with the same effect in the core business.We also need to know two keyword:　connection point (Joinpoint), a simple understanding is the method defined in the tangent module. Is the method in the definition class above.　pointcut (Pointcut). Is the collection of connection points, whic

introductionHibernate is an open source object-relational mapping framework that is very lightweight for JDBCObject encapsulation, which allows Java programmers to manipulate the database at will using object programming thinking.Hibernate can be used in any application where JDBC is used, either in the Java client program orCan be used in servlet/jsp Web applic

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 .Back to top 4 ty

code (you need to add or remove some code in the late code, just modify the parent class code)Iii. Steps of Succession:1. Extract the properties and methods from multiple classes to create a parent class2. After subclasses use the extends keyword to complete inheritance, subclass extends parent class3. You can call the code of the parent class in the subclassNote: A single inheritance in Java, only one parent after the extends keywordSubclass access

integer is the object, which points to the object with a reference. When you need to put something in the arraylist,hashmap, such as the int,double type is not put in, because the container is loaded with object, this is the need for these built-in type of outer covering class. Each of the built-in types in Java has a corresponding overlay class.8, the difference between the run-time exception and the general exceptionJava provides two main types of

1. Java Three systems (one system)Javase:java standard Edition, Desktop System Standards Edition. Javase contains classes that support the development of Javaweb services and provides the basis for Javaplatform,enterprise edition.Javame:java micro Edition, suitable for micro versions of embedded devices. Includes a flexible user interface, robust security model, many built-in network protocols, and more.Javaee:java Enterprise Edition, server applicati

1, introduce the structure of collection frameThe collection is a very important knowledge point in Java, which is divided into three data structures: list, Set, Map and queue. Their structural relationships in Java are as follows:The collection interface is the parent interface of list, Set, and queue.The set interface has two common implementation classes: HashSet and TreeSet. The common interfaces of the

overflow zone 2, how HashMap in Java is implemented We can understand it as " array of list ". HashMap is actually implemented as a linear array, so the container that can be understood to store the data is a linear array.So how does a linear array implement key-value pairs to access data? Here HashMap has to do some processing.1. First hashmap inside a static inner class entry is implemented. Its important attributes are key,

Java Face Test-javaweb Chapter seven 61,JDBC the basic steps to access a database.1, load Driver2, get the connection object through the DriverManager object connection3, getting the session through the Connection object4, through the session of data additions and deletions to check, packaging objects5, close the resource 62, tell me the difference between preparedstatement and statement.1, efficiency: pr

differentiate iterator from the two aspects of enumeration: Iterator allows the removal of elements from the underlying collection. The method name of the iterator is standardized. How does 9.Hashmap sync?When we need a synchronized hashmap, there are two options: Use Collections.synchronizedmap (.. ) to synchronize the HashMap. Using the Concurrenthashmap The preferred choice between these two options is to use Co