Java

Transferred from: http://www.cnblogs.com/aigongsi/archive/2012/04/01/2429166.htmlIn Java thread concurrency processing, there is a very big confusion about the use of a keyword volatile, for the use of this keyword, in the multi-threaded concurrent

Here are some of the lessons I summarized in the previous lesson and the code is most of the teacher's notes personally think is very good, but also a more classic content, sincere hope that these for those who want to learn some help!Because the

Decimal conversion to 16, eight, binary without write algorithm directly withString hexstring = integer.tohexstring (int= integer.toocalstring (int= integer.tobinarystring (int decnum);The N-ary Nstr is converted to decimal, and can be used with

ServerSocket has the following 3 options.So_timeout: Represents the time-out period waiting for a client connection.SO_REUSEADDR: Indicates whether to allow reuse of addresses that are bound by the server.SO_RCVBUF: Represents the size of the buffer

1. Static methodsIn general, defining a method in a class is static, which means that you do not need an object of this class to call this methodThe method declared as static has the following limitations:• They can only invoke other static methods.•

One. In J2SE we can use the Math.random () method to produce a random number, the resulting random number is a double between 0-1, we can multiply him by a certain number, for example, multiplied by 100, he is a random within 100, this is not in the

1. The concept of Java reflectionReflection meaning: You can get a running Java object.2, the function of Java reflection1) You can determine the class to which the run-time object belongs2) You can determine the member variables and methods that

What is threadlocal?As early as the version of JDK 1.2, Java.lang.threadlocal,threadlocal provides a new way to solve the concurrency problem of multi-threaded threads. Using this tool class, you can write beautiful multithreaded programs very

ARead the example carefully : Enumtest.java , run it, analyze the running results? What conclusions can you get? Have you mastered the basic usage of enum types? Conclusion : The enumeration does not belong to the original data type, and each of its

A brief analysis of final keywords in JavaWhen it comes to the final keyword, it's probably a lot of people who are not unfamiliar with the final keyword when using anonymous internal classes. In addition, the string class in Java is a final class,

1. The TCP protocol sends data and receives dataThe TCP protocol receives data:• Create a Socket object on the receiving end• listen for client connections. Returns a corresponding socket object• get input stream, read data displayed in console•

Java Basic Key GuidelinesEveryone has their own way of learning, here are some of the key points I summarize after studying Java:One: (understanding) Java was born in 1995 and was developed by Sun Company. It compiles the source code into an

First, binary Insert Sort ( Two-point insertion sort )The method of inserting the insertion position in the direct insertion sort to find a[i] is replaced by the binary comparison, and the binary insertion sorting algorithm can be obtained. When

OverviewIn the previous chapter, we learned about the architecture of collection. At the beginning of this chapter, we explain the specific implementation class of collection, first of all, to explain the list, and the list of ArrayList is most

Deep understanding of Java reference typestypes in Java can be categorized into two main categories: value types and reference types. A value type is a basic data type (such as int, double, and so on), whereas a reference type refers to all types

Traditional MVC is believed to be used by everyone, especially the Web Developer (server side).General data requests, changes will be the controller control, and then find the corresponding model, which is the general MVC. Then, once the model has

The JavaMail API is an optional package that reads, writes, and sends electronic information. We can use it to build mail user agents such as Eudora, Foxmail, MS Outlook Express (mail users agent, abbreviated as MUA). Let's see how the JavaMail API

In computer programming, a callback function , or a callback (Callback, which is called by call and back, is returned to the main function after the main function invocation), refers to a piece of executable code that passes through the function

1. Java Multithreading Program design in layman 'sMultithreading is a mechanism that allows multiple instruction flows to be executed concurrently in a program, each of which is called a thread and is independent of each other.One: Understanding

Java -- use DOM4J + Singleton mode to read XML files XML is a scalable markup language that is often used as a configuration file in projects. XML has high scalability. As long as you follow certain rules, the scalability of XML is almost unlimited,