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message queue identifiers. Message Queuing overcomes the disadvantages of less signal transmission information, only unformatted byte stream, and limited buffer size. Shared storage sharedmemory: Shared memory is the mapping of memory that can be accessed by other processes, which is created by a process, but can be accessed by multiple processes. Shared memory is the fastest IPC approach and is specifically designed for low-efficiency operation of other interprocess communication modes. It

Spring is an open-source, lightweight framework whose core is inversion of control (IOC) and aspect-oriented programming (AOP).As a business layer framework, spring is a good way to integrate the presentation layer with the persistence layer.IOC: Writes the creation and dependency of a class to a configuration file, allowing the dependency of an object to be injected by a configuration file instead of being active to new, allowing for loose coupling.Popular point is: the creation of the object o

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

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 thread executi

of very long strings, asking for strings that meet the requirements, such as the destination string: 1231******3***2, 12*****3 These are all going to find out.11. There are n strings of length m+1,If the last m character of a string matches the first m characters of a string, then two strings can be joined,Ask these n strings to be a maximum number of strings and return an error if a loop occurs.12. Find the maximum distance between any two nodes in a binary tree,The two-node distance is define

first is to complete the initialization of the object by constructing the method, the subclass constructor method by default calls the parent class construction method, through super () way(1). The parent class has a default constructor method, and the constructor of the subclass executes super () by default, and the constructor method of the parent class is invoked to instantiate(2). The parent class does not have a default construction method (which is definitely handwritten by the constructo

the thread pool (thread pool)?A: In object-oriented programming, it takes time to create and destroy objects because you create an object to acquire memory resources or other resources. More so in Java, virtual machines will attempt to track each object so that it can be garbage collected after the object is destroyed. Therefore, one of the means to improve the efficiency of the service process is to minimize the number of objects created and destroyed, especially the resource-intensive object

),77. The following statements are overloaded or duplicate declarationsint max (int *ia, int sz);int max (int *, int = 10);Their difference is one with default parameters and one without default parameters.Because the argument lists are different only by default, they are not overloaded, but they are repeated declarations.78. Write a C function that gives the number of bits in a byte that are placed 1.　　int count (char tmp) {int count = 0;for (int i = 0; i 　　79. Programming QuestionsWrite a func

Title DescriptionXiao Ming is very interested in the probability problem recently. One day, Xiao Ming and Xiao Red play a probability game, first Xiao Ming gives a letter and a word, and then by the small red to calculate the probability that the letter appears in this word. Letters are case insensitive.For example, the given letter is a and the word is Apple, then the probability is 0.20000.InputThe input contains multiple sets of test data. Each group of data contains one letter and one word.

of the p-r curve is very small , which may cause p to remain low or fast (because it is not easy to predict correctly), R quickly reaches near 1, similar to the two curves in figure (d), where the performance of different models can be more clearly reflected by using the P-r curve. There is a reference to read: the relationship between Precision-recall and ROC Curves, not yet read, leave a name here first.[The understanding of the relationship between the two curves is also very shallow, the la

Little Q is designing a street lamp placement scheme for a road of length n.To make the problem easier, small Q treats the road as n squares, where it needs to be illuminated. Indicates that the barrier lattice that does not need to be illuminated is denoted by ' X '.Small q now to set some street lights on the road, for the position of the street lamp, this lamp can illuminate pos-1, POS, pos + 1 of these three positions.Little Q hopes to place as few streetlights as possible to illuminate all

methods of the object-oriented, such as: __new__, __init__ 63 How to determine a function or a method? 64 static methods and class methods differ? 65 enumerates the special members in object-oriented and the scenario. 66 1, 2, 3, 4, 5 can be composed of how many different and no duplicates of three digits. 67 What is reflection? and application scenarios? Metaclass effect? and application scenarios? 69 implements the singleton mode in as many ways as possible. The wording of the 70 ador

the object)Set Loadonstartup in three different situations:(1) Loadonstartup In the case of negative numbers, the Web container is not instantiated when it is started, and is instantiated the first time it is requested.(2) loadonstartup > 0When the Web container starts, it is instantiated, the order is small to large, and the smaller the positive integer is first instantiated.(3) Loadonstartup = 0When the Web container is started, it is instantiated, equivalent to the maximum positive integer,

is set to NULL, will the garbage collector immediately release the memory occupied by the object?No, in the next garbage collection cycle, this object will be recoverable.100. What is the difference between a serial (serial) collector and a throughput (throughput) collector?The throughput collector uses a parallel version of the new generation garbage collector, which is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, whic

constructor that completes a member-to-member copy of the default copy constructor15. What is a depth copy?A shallow copy is the creation of an object that initializes it with a ready-made object simply by copying the member (simple assignment) without copying the resources assigned to the member (such as assigning dynamic memory to its pointer variable members); Deep copy is when an object is created, if the resource is allocated, you need to define your own copy constructor. So that not only

class contains an iterative method that can return an iterator instance. Iterators can delete elements of the underlying collection during the iteration, but they cannot call the collection's remove (Object Obj) directly, and can be removed through the Remove () method of the iterator .What is the difference between 24.Iterator and listiterator?Their differences are listed below:The iterator can be used to traverse the set and list collection, but Listiterator can only traverse the list.Iterato

stack if (strlen($str)==0){return [true, []];}Else if (strlen($str)==1){return [false, $ls];} while ($sp+1Count($ls)){//If the end of the stack character matches the next character in the stack if ($ls[$sp]=='['$ls[$sp+1]==']'){//Delete these two characters Array_splice($ls, $sp, 2); if ($sp>0){//stack tail pointer forward 1 bits--$sp;} }Else{//into the stack++$sp;} }if (Count($ls)==0){return [true, []];}Else{Echo implode($ls), "\ n"; return [false, $ls];}}/*** Complete par

also divert, ssh-copy-id-i ssh/id_rsa.pub [email protected], also enter the root password of a server in the middle.5) Done, now the AB between the landing has no longer need password.5. A simple description of the seven levels of the OSI reference ModelPhysical layer: Network cable, optical cable, copper wire These things can be seen by the naked eye.Data Link layer: frame, MAC addressNetwork layer: Packet, IP addressTransport layer: TCP protocol, UDP protocolSession Layer: Establish session,

sent to the memcached are completely atomic. If you send a set command and a GET command for the same data at the same time, they do not affect each other. They will be serialized and executed successively. Even in multithreaded mode, all commands are atomic unless the program has a bug:)The command sequence is not atomic. If you get an item with a GET command, modify it, and then want to set it back to memcached, we don't guarantee that the item is not manipulated by another process (process,

this button to gray disabled state can call function (EnableWindow)13. The message to redraw the window is (WM_PAINT)V. Advanced Programming/Other1. To assign a value to the absolute address 0x100000, we can use * (int*) 0x100000 = 1234;So if you want the program to jump to the absolute address 0x100000 to execute, what should be done? Please write the code* ((Void (*) ()) 0x100000) (); Jump with function pointer2. It is known that the 0x64 is the data port of the keyboard, and when a key on th