jswipe faq

Win7 64-bit mysql 5.7 download and installation FAQ, win75.7 1. Download MySQL from the official website: This is what we are looking for, win7 64-bit Click to download; Yes, we do not need to log on to the registration. Just click the one in the red line. 2. installation and configuration: Decompress the package to the local Folder: Go to the directory and copy the my-default.ini file and rename it my. ini Open my. ini for configuration C

the object in the Cenozoic to survive for some time and do not create too large objects and arrays to avoid directly in the Laosheng generation object. Pemanet Generation Space ShortageIncrease Perm Gen space to avoid too many static objects. The average size of the GC promoted to Laosheng is greater than the remaining space of the Laosheng generationControl the proportion of the new generation and the old generation. Call System.GC manually ()Garbage collection should not be trigge

(minor) recycling operations. For servers that require low latency and less CPU. The general single CPU turns on incremental mode.-xx:parallelcmsthreads=nThe number of threads used by the concurrent garbage collector to mark the scan Garbage collection Statistics-xx:+printgcOutput GC log, summary log.-xx:+printgcdetailsPrint GC logs detailing the logs for each zone.-xx:+printgctimestampsPrint GC logs detailing the GC run time logs. The timestamp of the output GC is shown in the form of a base

, thread stack informationHeap Detail Summary informationDisplays summary information for heap dump, including heap basic information, environment, System properties, and threads on heap dumps.analysis of Class object in heapShows all classes used within the heap, as well as the number of instances and the size of their usage. The default is reversed by the number of instances.in-heap object instance detailsThe class can enter instance details for the specified class, including details for each

for up to a specified waiting time was in this state.One thread waits for another thread to wake up within a time threshold, and the threshold is returned to the runnable state.Enter the Timed_waiting state using the following methods: Call Thread.Sleep () Call Object.wait () exceeds the time threshold value Call Thread.Join () exceeds the time threshold value Call Locksupport.parknanos (Object,long) Call Locksupport.parkuntil (Object,long) TERMINATEDA thread that

IOS interview FAQ, ios interview1. jesus has 13 disciples, and one of them is the traitor who sold Jesus. Please use exclusion to find the traitor: 13 people sat around and started reporting cyclically from the first person and counted to three, the last person left is the traitor.Int people [13] = {1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 }; Int count = 0; // used to record the number of reports Int number = 13; // record the number of living persons I

if it does not, it stores the 3 in and then points a to 3. then the int b = 3 is processed, and after the reference variable of B is created, because there are already 3 values in the stack, B points directly to 3. In this case, A and B both point to 3. At this point, if a=4 again, then the compiler will re-search the stack for a value of 4, if not, then store 4 in, and a point to 4, if already, then direct a to it. Therefore the change of a value does not affect the value of B. Java

size of the data area required by the program module in order to allocate its memory when it enters a program module in operation. Like the stacks we know in data structures, stack storage allocations are distributed according to the principles of advanced post-out. Heap-StorageHeap storage allocations are specifically responsible for the memory allocation of data structures that are not determined by the storage requirements at compile time or at runtime.For example, variable-length strings

STD has a function called Getline, which is to read each line from the input file and save the line in a string, each line is identified by a newline character (\ n).It's prototype is,istream Getline (istream is, string str);If you want to traverse an input text file, you can write the following code:#include When the end of the file is encountered, the function automatically stops extracting the string, then the corresponding while loop condition is judged false and jumps out of the loop.The ne

solve the problem of shared key encryption. Public key encryption uses a pair of asymmetric keys. One is the private key (The secret key), and the public key (the public key), where the private key is not known to anyone, and public keys are free to advertise.Encryption method:Send the end of the cipher, use the other's public key for encryption processing, the other party receives the encrypted information, use the private key to decrypt the ciphertext.In this way, you do not need to send the

session, and if there is a direct return 2, If there is no judge whether it is lazy, if it is not directly access to the database retrieval, found that the record returned, not to throw exception 3, if it is lazy need to establish a proxy object, the object's initialized property is the False,target property is null 4, When accessing the properties of the obtained proxy object, the database is retrieved, and if a record is found, the object of the record is copied to the target of the proxy obj

1. Error occurred during compile run: syntaxerror:non-ascii character ' \xe7 ' in file. , but no encoding declared; See http://python.org/dev/peps/pep-0263/for detailsCause of the problem: Python does not support encoding in the source file by defaultWorkaround: Follow the wrong recommendation URL to view http://www.python.org/peps/pep-0263.html1. Add the following comment code to the header of the file:# coding=Example: # Coding=utf-8Second, add the following two lines of comment code at the he

Python crawler interview FAQ Do you know the synchronization and Asynchronization of threads? Thread Synchronization: multiple threads access the same resource at the same time and wait for the end of resource access, wasting time and reducing efficiency Thread Asynchronization: accesses other resources at the same time during idle waiting for resource access, implementing multi-thread Mechanism Do you know the synchronization and Asynchronizati

decimal operation. Note: Be sure to use the BigDecimal (String) constructor, and never use BigDecimal (double) . Using BigDecimal correctly, the program can print out the results we expect 0.90:Import Java.math.BigDecimal;public class change1{public static void Main (String args[]) {System.out.println (New BigDecimal ("2.00"). Subtract (New BigDecimal ("1.10"));}}In summary, avoid the use of float and double in places where precise answers are needed, and use int, long, or bigdecimal for curren

length limit, the limit is mainly the length of the URL limit, the post data can be very large.3. Post is safer than get, data is not visible on the address bar. Parameters are not saved in the browser history or Web server log4. For data type restrictions, get only allow ASCII characters, post no limit. also allows binary data5.get Back button/refresh is harmless, and post data is resubmitted (the browser should tell the user that the data will be resubmitted). 6.get can be saved as a bookmark

What is a class? Type consists of a set of States and operations that can be transformed between various States;class provides a set of actions and a set of data to describe the abstract concept of a type object. Class interface Design principles "Simplified View": consciously hide unnecessary details, reduce the likelihood of user error;"Vocabulary of Usesrs": Reduces user learning curve. What is encapsulation Encapsulation is intended to prevent unauthorized access to informa

corresponding componentsThe fast-cutting framework is the leading web front-end engineer in China to develop a framework in some respects closer to the habits and needs of our domestic developers, the potential is great.CSS Precedence1. inline > inline = external (inline and external dependent order to determine)3. Selector relationship:id> element > class selector >4. Property selector > class SelectorDetermine priority based on CSS weight values (4 types)1. Name selector a b c D2. Embedded 1

Alibaba JAVA Development interview FAQ Summary 4Three main features of java Encapsulation, inheritance, and PolymorphismDifferences between abstract classes and interfaces Java Abstract class:Classes modified using the abstract keyword are called abstract classes.Abstract methods are called abstract methods.Features:1. Classes containing abstract methods must be declared as abstract classes (whether or not they contain other general methods) (otherwis

put the general in front, the more dedicated to the back explain the 4 code: read the code, The first line height:100px; Everybody is universal, IE6 IE7 FF all show 100px to the second line *height:300px; FF does not recognize this attribute, IE6 IE7, so FF also display 100px, and IE6 IE7 the first row to get the height property to cover, all show 300px to the third row _height:200px; only IE6 know, So IE6 again covered the height in the second row and finally showed 200px so that three browse

operating system at logon, sets environment variables for environment files before reading your own profile.User-level~/.profile, each user can use this file to enter shell information that is specific to their own use.~/.BASHRC, the file contains bash information dedicated to its own bash shell, which is read when it is logged in and every time a new shell is opened.~/.pam_environment, user-level environment variable settings file.Example:We want to add the Java configuration to the system env