property or member variable in a block that needs to reference an external controller, be sure to use weak references, especially member variables like _testid, where many people do not use weak references and cause memory to be freed.For objects that are normally created, because they are now arc projects, remember that the golden rule of memory management can be solved.18, which third-party libraries have been used?If you've ever developed an app and answered that you haven't used a third-par
IOS interview questions (2) and ios interview questions
1. Functions of readwrite, readonly, assign, retain, copy, and nonatomic attributes.
2. When to use delegate and Notification?
Iii. Target-Action Mechanism
4. When is t
JAVA engineer interview questionsZookeeper
I went to a company for an interview today. I felt dizzy with my brains. I didn't make a few algorithm questions. The questions were relatively simple. I should have prepared myself, but the status was not good, after the
picture suffix 2, how to suffix is tampered with, then each file has a magic digital file upload-magic number5, the principle and implementation of Message Queuing Answer: 1, Message Queuing Principle 2, comprehensible message queue ActiveMQVi. Database Aspects1. The MySQL query field area is not case-sensitive?Answer: Do not differentiate, even if the value is not differentiated (I asked at the time, the area of the application of the size of the meaning of what, the interviewer did not say)2,
Cisco network engineer interview questions
23 Cisco Network interview questions for Cisco senior after-sales network engineers
1. In the current 6509 and 7609, The sup720 switched bandwidth to 720 GB. Can it be said that 7609/6509 can replace part of the GSR status?
Find an internship to find the heart tired, so in the school BBS found a Sina's scattered strokes.First do a pen test, the title is as follows.1. List the UNIX signals you know and explain their use2, give you an IP address, write its unsigned 32-bit representation3, give you some HTTP stuff post request, data, Cookie,url, write an HTTP header.4. Briefly describe some shell commandsTop/mv/find/sar/touch/wc/chmod/df/strace5, write a program in PHP, print out this month's calendar6, simple SQL que
integer.In other words, a mutex can only be used for mutually exclusive access to a resource, and it cannot implement multi-threaded mutex issues for multiple resources.The semaphore can realize multi-thread mutual exclusion and synchronization of multiple homogeneous resources.When the semaphore is a single-valued semaphore, it is also possible to complete mutually exclusive access to a resource.3. The lock and unlock of the mutex must be used by the same thread, the semaphore can be freed by
Interviewer: A girl in her twenties, less than 30
A. come up with a good question, let the cool milk in the cool leader and the cool milk in the cool leader's leeching sheath be excited? 0 minutes.
For example, the "aabbcddef" character string must be output"
I started to understand the question wrong. The program I wrote was wrong. I wrote it again after prompted. :
Sian O M engineer interview questions
1. What are the functions of the following Linux commands?
Chkconfig -- level 3 sendmail on
Tar-czvf test.tar.gz ./
Chown-R www: www/usr/local/apache/htdocs/
[-D/data1/logs] mv/data1/logs/data1/logs. old
Rsync 192.168.0.200: software.tar.gz.
Rpm-ivh sina. rpm
 One of the interview questions for C/C ++, a Linux Application Development Engineer: synchronization of multi-threaded programs in Linux
Reference: three methods for Linux Thread Synchronization
In Linux, the most common three methods of thread synchronization are mutex lock, condition variable,
Regular Interview Questions and answers by a ribaba Java engineer, Baba java
1. Implementation of Spring AOP and IOC
2. Distributed message queue and distributed cache
Message Queue: RabbitMQ, Kafka
Ø database How are you usually optimized, what other tools are used to optimize no, how to use the
Ø Now there is a lot of tables to correlate the query SQL, the child table data is very much, then you only from the SQL point of view of the SQL statement optimization, do not need to consider the index, predicate
Ø you don't have a Java project, do you?
Ø your major is to control the direction, why do the current direction
O you have any que
What is the hidden content of this post after a PHP programmer's classic interview and a written examination question? 201712195421.rar (41.35KB, Downloads: 1) 2010-10-1322: 37 uploads and downloads: 1 Original Post address: http://phpjava.org/thread-25-1-1.htmlthis article comes from the PHP programmer's classical interview Analysis of written examination questions
What is the hidden content of this post after a PHP programmer's classic interview and a written examination question? 201712195421.rar (41.35KB, download times: 1) 2010-10-1322: 37 Upload download times: 1 Original Post address: phpjava.orgthread-25-1-1.html this article from: PJDN -- php amp; java Forum | technical exchange community PHP programmer Classic Interview Analysis of written test
Embedded linux engineers interview questions C language basics-general Linux technology-Linux programming and kernel information, the following is a detailed description. I saw an embedded interview on the Internet and suddenly felt very small ...... In the future, I will post my answers one after another. Of course, some of my answers may not be accurate, and th
What is the hidden content of this post after a PHP programmer's classic interview and a written examination question? 201712195421.rar (41.35KB, download times: 1) 2010-10-1322: 37 Upload download times: 1 Original Post address: phpjava.orgthread-25-1-1.html this article from: PJDN -- php amp; java Forum | analysis of classic interview and written examination question
[Interview] interview questions for iOS development (1)
1.# What is the difference between import and # include? What is the difference between @ class and # import A: # import is the keyword used to import the Objective-C header file. # include is the keyword used to import the C/C ++ header file. The # import heade
When you're ready for a technical iOS interview, it's important to understand what topics you might be asking and what experienced iOS developers expect.This is a series of questions that many Silicon Valley companies use to measure the level of seniority of iOS candidates.T
Common algorithm questions in iOS interviews and common iOS interview Algorithms
Here is an algorithm question you have encountered in your iOS job search. I hope it will help you. Occasionally updated. If you want to run code debugging online, you can copy the co
to the View (its subclass can also be used, such as UIButton). The Controller adds a target selector to the button and calls back to the Controller when the button is pressed, the Controller then updates the Model. When the Model changes, the Controller receives the observer message or notification message and updates the View display style.
What is high cohesion and low coupling?Extended Interview Questions
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