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Deep understanding of Java Virtual Machine-Chapter 3: deep understanding of Java Virtual Machine 1. Overview 2. Is the object dead? Reference Counter Add a reference counter to the object. When there is a reference, add 1 to the counter. When the reference is invalid, the counter minus 1. Objects whose counter is 0 at any time cannot be used again. If the object is a circular reference, it cannot be process

Deep understanding of Java Virtual Machine-Chapter 10-early (compilation phase) optimization, deep understanding of virtual machines Chapter 2 early (compilation period) Optimization Javac compilation process: 1. parsing and filling the symbol table process Lexical and syntax analysis converts the source code to a Token set. For example, the code "int a = B + 2" contains six tags: int a = B + 2 Fill

Inverse Polish algorithm ~ Simple understanding of stack, Polish algorithm understanding # Include 　　

Deep understanding of Java Virtual Machine _ Chapter 2 _ Reading Notes and deep understanding of virtual machines 1. Contents of this chapter: Overview Data Area During Running Program counters Java Virtual Machine Stack Local method Stack Java heap Method Area Runtime constant pool Direct Memory HotSpot virtual machine object discovery Object Creation Object Memory L

Understanding of JAVA programming ideas and understanding of JAVA programming ideas1) POP -- Process-oriented programming ):Process-oriented programming is a functional-centered way of thinking and organizing. It emphasizes the process of processing and processing system data, in program design, the function or process is the basic structure of the program. The system function is composed of a set of relate

Python-Understanding functions, python-Understanding FunctionsFunction Definition Def functionname (arg ): Suite Return [expression] 1. keywords used when def defines a function 2. functionname function name 3. The parameter name of the arg function. Different parameters are input, and the return value is also different. The function is implemented by passing parameters. 4. Suite is the code segment that im

Deep understanding of recursive functions, many misunderstandings, and deep understanding of Recursion I haven't been able to take notes for a long time. This time, sky (my nickname) will explain something to everyone. What's wrong with me?# Include Using namespace std;Void bin (const unsigned int I){If (I/2)Bin (I/2 );Cout }Int main (){Int;Cin>;Bin ();Cout Return 0;}This is a binary program for finding a

An advanced understanding of JavaScript objects and a comprehensive understanding of javascript To understand JavaScript objects, we can start with object creation, attribute operations, and object methods. To sum up, it includes the following modules: 1. Create an object 1.1 direct object volume The direct volume of objects is the easiest way to create objects. A ing table consists of several name/value pa

In-depth understanding of Android (2) -- Understanding JNI (medium) and androidjni in Android Sunshine Xiaoqiang participated in the CSDN blog Star Selection, If you think sunshine Xiaoqiang blog is helpful to you, vote for Xiaoqiang: http://vote.blog.csdn.net/blogstar2014/details? Username = lxq_xsyu # content In the previous article, we learned about the use of JNI in Android. In fact, JNI is a very early

Html semantic understanding and html semantic understanding 1. What is HTML semantics? Based on the structure of the content (content semantics), select the appropriate tag (Code semantics) to facilitate developers to read and write more elegant code while enabling browser crawlers and machines to parse it well. 2. Why semantics? In order to present a good content structure and code structure on the page

Deep understanding (function () {...}) (); and deep understanding of function 1. It is called an anonymous function that runs immediately (also called an immediate function) 2. When an anonymous function is enclosed and a bracket is added to it, this anonymous function can run immediately! It's amazing ~ 3. To use a function, we must first declare its existence. The most common method is to use a function s

In-depth understanding of ListView: Performance Optimization 1. in-depth understanding of listviewOne list shows three elements: 1. ListView: displays the view of the list; 2. Adapter: map data to ListView; 3. Data: The specific string, image, or other basic components to be mapped; 2. Optimization Principle: 1. Create only necessary view objects; How to load data with ListView: Call the getCount () functio

In-depth understanding of dependency injection in Angular4 and in-depth understanding of angular4 Using dependency injection in Angular can help us achieve loose coupling. It can be said that only dependency injection can be used in components to truly implement reusable components.If we have a service product. service. ts, export has a ProductService class, and the class has a getProduct method. If depende

A deep understanding of pseudo elements and a deep understanding of pseudo elementsDirectory [1] Definition [2] usage first-letter first-line before after selection [3] Highlights [4] DEMO first-word sinking nail effect image superposition effect Definition Pseudo elements are disguised as elements but not elements, which are related to the generated content. The generated content mainly refers to the conte

A deep understanding of this in the Javascript arrow function and a deep understanding of javascript First, let's take a look at the code. This is a Countdown class "Countdown" and Its instantiation process: function Countdown(seconds) { this._seconds = seconds;}Countdown.prototype._step = function() { console.log(this._seconds); if (this._seconds > 0) { this._seconds -= 1; } else { clearInterval(this._ti

A deep understanding of the operating principles of various methods in Python, and a deep understanding of python How does the method work in Python? A method is a function that exists as a class attribute. You can declare and access a function in the following way: >>> class Pizza(object):... def __init__(self, size):... self.size = size... def get_size(self):... return self.size...>>> Pizza.ge

Deep understanding of Vue conditional rendering and list rendering, deep understanding of vue I learned a lot about conditional rendering and list rendering in Vue. js over the past two days, and it is very important. So, add a little note today. Conditional Rendering V-if Use v-if in When using the v-if control element, we need to add it to this element. However, it is too troublesome to add multiple elem

A deep understanding of the principles of Vue one-way data streams and a deep understanding of vue data streams What is one-way data stream? One-way data streams can only modify the status in one direction. It is a simple example of unidirectional data streams: Simple diagram of one-way data stream A unidirectional data stream corresponds to a bidirectional data stream (also called bidirectional binding ).

In-depth understanding of the node. js http module, and in-depth understanding of node. js The http module is mainly used to build an HTTP server and client. The HTTP module must be called to use the http server or client functions. Create a server Var http = require ("http"); var url = require ("url"); // create a server // http inherits from tcpvar server = http. createServer (function (req, res) {var url

In-depth understanding of display attributes-common important attributes of front-end layout, and in-depth understanding of display Note: The display attribute is very common in web page layout, but it is often used only a few attribute values, such as block, inline-block, inline, And none. I will introduce each aspect of the display attribute in detail below.Definition The display attribute specifies the b