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port can be divided into 3 main categories:1) Accepted ports (well known Ports): from 0 to 1023, they are tightly bound to some services. Usually the communication of these ports clearly indicates the protocol of some kind of service. For example: Port 80 is actually always HTTP traffic.2 registration port (registered Ports): from 1024 to 49151. They are loosely bound to some services. This means that there are many services that are bound to these p

managed by some sort of automatic memory management mechanism, often called "garbage collection" (Garbage COLLECTION,GC). The JVM specification does not enforce which GC algorithm is required by the JVM implementation. Stack--only objects and object references of the underlying data type are saved in the stack. Each thread is a stack area, and the data in

word should be a noun. Besides describing delivery behaviors, it also implies the people and things involved in building this key, this is the focus of this article. When talking about the delivery of the turn-key, we can intuitively look at these things: hardware, software, design documents, application documents, test reports, and so on. Everyone on Earth knows this .. Not much. The Turn-key itself should refer to a continuous project, far from be

arts world, writing PHP with Pear is like hundreds of martial arts masters pouring their skill to programmers. Let the program developers do not from the most basic practice, put down horse training, borrowing their skills can be very easy to multiply, efficiency doubled. Say for a long, what is pear? The next unit is

also transparent when the thickness is very thin, can let the visible light penetrate, so a large number of applications in various optoelectronic components.In addition, the semiconductor process technology must be used above the post-conductive glass to grow "switch element", the simplest switching element is "MOS", but MoS has a metal, oxide, semiconductor structure, must grow on the silicon wafer, to g

();Native synchronized private float Native3 (Object o);native void Native4 (int[] ary) throws Exception;}The declarations of these methods describe what the non-Java code looks like (view) in these Java code.The identifier native can be used with all other Java identifiers, except for abstract. This is justified because native implies that these methods are implemented, except that the implementations are

Overview Functions are the basis for modular program design. To compile complex Ajax applications, you must have a deeper understanding of functions. Functions in JavaScript are different from other languages. Each function is maintained and run as an object. Through the properties of function objects, you can easily assign a function to a variable or pass the function as a parameter. Before proceeding, let's take a look at the usage syntax of the fun

thread is used, computer resources cannot be reused, resulting in a huge waste of resources. Therefore, using multithreading on multiple CPU computers can improve the CPU utilization. 4) multithreading can simplify the program structure and make the program easy to understand and maintain. A very complex process can be divided into multiple threads for execution. From: new book "Java programmer interview test book" Official Website

The new lithium battery (polymer battery) is short for Polymer lithium-ion battery and one of the types of lithium-ion battery. To understand what a new lithium battery is, in addition to providing the definition of the new lithium battery, we also need to find the answer from its classification, characteristics and target market.I. Definition: the so-

Http://forum.eepw.com.cn/thread/149216/1 What is a pull-up resistor? What is a drop-down resistor?Pulling up is to embed uncertain signals through a resistor at a high level! The resistor can throttling at the same time! The same is