learning apex programming

For reasons of interest, in recent years, especially in some open source architecture or projects to learn a bit of experience or methods worth learning. Think about it, always good reputation in Unix should have something worth learning. I found the English version of the UNIX programming art, it was too slow to read a day, and eventually turned to the Chinese v

. colors=["Red", "Blue"];} function Subtype () {Supertype.call (this);} var New subtype (); Instance1.colors.push("Black"); alert (instance1.colors) ; // Red Blue Black var New subtype (); alert (instance2.colors); // Red BlueCombination Inheritance:function Supertype (name) {this.name = Name;this.colors = ["Red", "Blue"];} SuperType.prototype.sayName = function () {alert (this.name);}; Function subtype (name,age) {supertype.call (this,name);//inheritance Property This.age = age;} Inheritance me

Multi-thread programming learning 2 (concurrent access to objects and variables) and multi-thread programming VariablesI. ConceptsNon-thread security:When multiple threads concurrently access instance variables in the same object, the result is "Dirty read", that is, the obtained data is actually changed.Thread security:The value of the obtained instance variable

, all non-static constructors are also referred to as instance constructors.　2. Static ClassWe often want the class to contain only static members, and cannot be used to instantiate objects such as the console. A simple way to do this is to use a static class instead of setting the class's constructor to private. A static class can contain only static members and does not require an instance constructor because, by definition, it cannot be instantiated at all. However, a static class can have a

Java Learning (12), object-oriented programming (4) Inheritance, concepts and super keywords, object-oriented programming super Inheritance Concept: ① The idea behind inheritance is to build new classes based on existing classes; ② When an existing class is inherited, its methods and attributes are reused. You can also add new methods and attributes to customize

Python learning diary-Object-Oriented Programming (1), python Object-Oriented Programming Python class and instance) Assume that a shoe has two attributes: size and color. Class can play a role in the template. Therefore, when creating an instance, you can forcibly enter some attributes that we think must be bound. By defining a special__init__When creating an in

;0) {write (SOCKFD, buff, NB Yte); } if (nbyteThis involves the IO multiplexing of SELECT, signal processing, fork subprocess, TCP server, UDP server, socket options.Here the Str_echo function and the fifth chapter of the same, signal processing function is not implemented, notice the function to call Waitpid.Note the interesting part here: We just use Select to listen for TCP's listening sockets and UDP sockets. Use child processes for connected TCP sockets to process.That is, TCP's pa

Linux C Programming learning-signal processing and linux programming Signal Processing Signal processing is a special feature of linux programs. Use signal processing to simulate the interrupt function of the operating system. To use the signal processing function, you must enter a signal processing function. 1 #include Run: # Gcc sig. c-o sig #./sig on another

Linux C Programming learning-process, process, process !, Linux Programming Linux supports multiple processes at the same time, that is, the multi-Program Design in the modern operating system, which is also called scheduling each process in the linux system to occupy the cpu time. Since the time of each time slice is very small compared with the macro time, it g

C Programming learning in linux -- how to lock the memory and lock the linuxc Programming In Linux, request page scheduling is implemented. Page scheduling means that pages are exchanged from the hard disk on demand and are exchanged when they are no longer needed. This allows the virtual address space of each process in the system to have no direct connection wi

[Java programming ideology-learning notes] Chapter 2nd everything is an object and java programming ideology 2.1 create a new data type: Class After understanding the object-oriented theory in chapter 1, we know that each object must belong to one type. How can we create a new data type in Java? The procedure is as follows: Class Circle {// attributes // method}

Java learning [network programming], java Network Programming Blog: http://blog.csdn.net/muyang_ren Sending and receiving threadsRecv. java package lhy.socket.server;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.Socket;public class Recv implements Runnable{ String str = null; private Socket

equal.If the comparison function is not passed in, it will turn the values all into strings and order alphabetically.9. Flip an array: You can use reverse methods to flip an array. This function is not required, the callback function is used directly. NewArray = Array.reverse ();10. Merging arrays: concat methods can be used to merge the contents of two arrays into an arrayconcatThe parameter of the method should be an array. The array in the parameter is stitched to the back of the original ar

Excerpt: Https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/ 001432004977916a212e2168e21449981ad65cd16e71201000TCP is to establish a reliable connection , and both sides of the communication can send data in the form of a stream . In contrast to TCP,UDP is a non-connection-oriented protocol .When using the UDP protocol, you do not need to establish a connection, just need to know the other side's IP address and port number , you can directly send packets. But I d

;} /*endofmodpost.c*/ each individual needs to evolve over and over again, and every engineer is no exception. When it comes to general entry, we might write code like this: Structmodule*mod;char*p,*s;mod=malloc (sizeof ( Structmodule)); Memset (Mod,0,sizeof (Structmodule));//Not considered mod== Null then went further: Structmodule*mod;char*p,*s;mod=malloc (sizeof (structmodule ); if (null==mod) returnnull;memset (mod,0,sizeof (structmodule)); Is it necessary to add a sentence of if (null==ptr)

PHP object-oriented programming (oop) learning Notes (1)-abstract classes, object interfaces, instanceof and contractual programming. 1. PHP's abstract class PHP5 supports abstract classes and abstract methods. Classes defined as abstract cannot be instantiated. If at least one method in any class is declared as abstract 1, Abstract classes in PHP PHP 5 supports

[Java programming ideology-learning notes] Chapter 1 operators and java programming ideology 3.1 simpler print statements The first program encountered by learning the programming language is nothing more than printing "Hello, world". However, it must be written in Java Sys

Multi-thread programming for APUE Learning (2): thread synchronization and apue multi-thread programmingTo ensure the security and reliability of critical resources, threads have to use locks. At the same time, only one or several threads are allowed to access variables. Common locks include mutex and read/write locks. Condition variable 1. mutex is expressed in pthread_mutex_t data type and must be initial

接的套接口 constchar FAR*buf,//字符缓冲区，内有将要发送的数据 int len,//即将发送的缓冲区的字符数 int flags//控制传输方式，可以是0)②RECV () function to receive data from a socket interfaceint recv( SOCKET s,//已建立的套接口 char FAR* buf,//用于接收数据的缓冲区 int len,//缓冲区的长度 int flags//调用方式 ，正常为0)Data transfer functions used by UDP①recvfrom () Receive dataint recvfrom( SOCKET s,//一个套接口 char FAR* buf,//接收数据的缓冲区 int len,//缓冲区长度 int flags,//调用操作方式 structfrom//源地址，向谁要信息 int FAR* fromlen//)②sendto () Send dataint sendt

Deep Learning on Java multi-thread programming lock optimization and java multi-thread programming Body When programming in a concurrent environment, you need to use a lock mechanism to synchronize operations between multiple threads to ensure mutually exclusive access to shared resources. Locking may cause performance