understanding macd

Java basics: Understanding and understanding of native keywords Writer: BYSocket) Weibo: BYSocket Douban: BYSocket Navicat is a hashCode method in the source code of java. lang. Object:? 1 public native int hashCode(); Why is there a navicat? This is what I want to learn. So today, The bricklayer wants to summarize navicat.1. Understand native, namely JNI and Java Native Interface All lang

First understanding of Swoole in PHP, first understanding of PHPSwoole Swoole is a PHP advanced Web development framework. It is not designed to improve website performance, but to improve website development efficiency. Minimum Performance Loss in exchange for maximum development efficiency. Using the Swoole framework, you can develop a complex Web function in a short time. Official definition: Swoole: red

Understanding of pure c struct and c ++ struct, and understanding of c struct // Main. cpp // If the file name is. the end of cpp indicates that this is a c ++ source program. // in the c ++ source program, the role of class is exactly the same as that of struct, // except for their default member attributes (the class is private by default, // struct is common by default), and struct has this pointer, and

03-queue group (understanding), 03-queue group understanding 1 # import "XZViewController. h "2 3 // 1. download two images: large image, LOGO 4 // 2. merge two images. 5 // 3. 6 7 @ interface XZViewController () 8 @ property (weak, nonatomic) IBOutlet UIImageView * imageView; 9 @ property (nonatomic, strong) UIImage * image1; 10 @ property (nonatomic, strong) UIImage * image2; 11 @ end 12 13 @ implementati

A deep understanding of memory leaks in JavaScript programs and a deep understanding of javascript Garbage collection frees us from allowing us to focus on application logic rather than memory management. However, garbage collection is not magical. Understand how it works, and how to make it retain the memory that should have been released a long time ago, you can achieve faster and more reliable applicatio

AngularJS self-learning path -- first understanding AngularJS and data binding, first understanding angularjsWhat is AngularJS? AngularJS official documentation introduces it in this way. Client technologies fully written in JavaScript. It works with other long-history Web technologies (HTML, CSS, and JavaScript) to make Web Application Development easier and faster than ever before.AngularJS is mainly used

Deep understanding of the JavaScript series (28): factory mode of design patterns, deep understanding of javascriptIntroduction Similar to the creation mode, when creating an object in the factory mode (as a product in the factory), you do not need to specify a specific class for creating the object. The factory mode defines an interface for creating objects. The subclass determines which class to instantia

A deep understanding of the advanced timer of javascript and a deep understanding of javascript SetTimeout () and setInterval () can be used to create a timer. The basic usage is not described here. This section mainly introduces the javascript code queue. No code in javascript is executed immediately. Once the process is idle, it is executed as soon as possible. Therefore, the time set in the timer does n

A deep understanding of the scope of javascript and a deep understanding of javascript In short, the scope is the accessible scope of variables and functions, that is, the scope controls the visibility and lifecycle of variables and functions. In javascript, variables have two scopes: global and local. Global scope is accessible anywhere in the code, called global variables. In the following three cases GL

execution process, it is used to respond to events initiated by users or program code or events triggered by the system. For example, if you want to input or modify the value of a field in Foxpro and then execute a program, the user-defined functions required by the valid clause and the valid clause must be created by entering code snippets. in access, a control) after the value is entered or modified, you must enter the program content during the event process of the afterupdate event attribut

In-depth understanding and application of the display attribute (1), in-depth understanding of the display Display is officially defined as the type of the box that the element should generate. This article focuses on the six commonly used values: none, block, inline, inline-block, inherit, and flex. Other tables and list-items are not recommended.I. None This element is not displayed. It is mainly distingu

Easy understanding of JavaScript status mode and easy understanding of javascript Status Mode The State mode allows an object to change its behavior when its internal State changes. The object seems to have modified its class. The usage scenarios of the Status mode are also specific, including the following:1. The behavior of an object depends on its state, and it must change its behavior according to its s

Understanding of CSS pseudo classes and understanding of CSS pseudo classes Because I have never been familiar with css pseudo classes much before, and I can't understand a piece of css code on the Internet. A: hover span. title {color: red ;.........} Currently, by querying the css manual, the css pseudo class only represents a State. a: hover only represents the tag in the suspended state of the mouse,

In-depth understanding of Android (1) -- Understanding JNI and androidjni in Android I participated in the CSDN blog Star Selection. If sunshine Xiaoqiang's blog has helped you in the past period, I hope to vote for you, every day can cast once: http://vote.blog.csdn.net/blogstar2014/details? Username = lxq_xsyu # content 1. What is JNI? JNI is the abbreviation of Java Native Interface (called locally in Ja

Handler's understanding and use 1. Handler's understanding and use Directory: Basic knowledge: 1. Android process and thread model 2. Main Android UI thread (or thread security issues) Knowledge points: Handler Introduction Handler Method 1: The subthread processes the transaction (working in the background). After the task is finished, the subthread sends a message through handler to notify the UI thread

[Android] an in-depth understanding of findViewById principles and an in-depth understanding of android I used too much, but I don't know the principle. In Xutils, instead of using the findViewById annotation, I didn't understand it at the time. After learning it step by step, we found that the findViewById efficiency is very low compared to the annotation method. The process of annotation + reflection load

references. In the heap, the right side is the memory representation of the function object, the center is the pointing of the prototype attribute of the function object, and the left side is the object instance created by the function object. The function object points to the pointer of the prototype attribute and writes dog1, dog2, and dog3 correspond to three reference changes of Dog. prototype respectively. They also have a relationship with dog1, dog2, and dog3 in the stack. (Note: Functio

Deep understanding of CSS counters and deep understanding of cssDirectory [1] Create counter [2] use counter [3] Before DEMO We are no longer familiar with counters. The list item mark in the ordered list is the counter. Create a counter There are two basic aspects for creating a counter: one is to reset the starting point of the counter, and the other is to increase it by a certain amount.Counter-reset Cou

Em understanding, em understandingEm Version: CSS1 Note: Your understanding: Note: The default browser size is 16px. The smallest font of Google Chrome is 12px. Font-size; inherited. Judgment steps: [] Check whether the font size of the element is set: Yes: So, Boder, width, height, padding, margin, line-height" , Are relative to the font size. Font-size * em value = equals to the actual value.

A deep understanding of the use of dictionary keys in Python and a deep understanding of the python dictionary Dictionary key The value in the dictionary has no restrictions. It can be any Python object, that is, from a standard object to a user-defined object. However, the keys in the dictionary have type restrictions.(1) One key cannot correspond to multiple values.One principle must be clarified: each ke