Java

Very large files We use normal file read way are very slow, and in Java provides me with the Randomaccessfile function, can quickly read large files and do not feel the card oh, below to see a demo instance of me.Server log files tend to reach more

Implementing the Javax.sql.DataSource interfaceImplementing the Connection getconnection () methodDefines a static member property LinkedList type as a connection pool, initializes 5 database connections in a static code block, adds to the

The Java.util.zip provides classes for reading and writing standard zip and GZIP file formats.It also includes classes that compress and decompress data using the DEFLATE compression algorithm (for ZIP and GZIP file formats).Relying on the JDK to

1, Method oneJava code char c = ' a '; if ((c >= 0x4e00) && (c 0x9fbb)) { System.out.println ("is Chinese"); } The above method is simple, but can only judge whether it is Chinese, but can not determine whether it is

1. The domain variables defined in the class can be accessed by all methods in the class.2. The scope of formal parameters and defined local variables is limited to the method, and local variables must be initialized before they are used.3. If the

After Java SE5, a new lock interface (and related implementation classes) is added to the package to implement the lock function. Although it is less (through the synchronized block or the method provided) to obtain the convenience of the release

Exampleimport Java.util.concurrent.ExecutorService; Import java.util.concurrent.Executors; Import Java.util.concurrent.ScheduledExecutorService; Public classCh09_executor {Private Static voidRun (Executorservice threadPool) { for(inti =1; I 5;

What is a JDK? What is a JRE?JRE (Java Runtime Environment): Java Runtime Environment;JDK (Java Development Kit): Java SDK, which already contains JRE;What environment variables do Java require, and what are the effects of these environment

Engaged in it work has been nearly two years, has been engaged in the work of PHP, has always wanted to learn Java, the reason is not to say, after all, excellent PHP programmer, will be a master of other aspects, such as Java, not to say that Java

/* Multi-threaded security issues1. Why are there security issues?Because the program is running, a thread will be eligible for execution after judging the condition, but no code is runningThe latter thread also judged the condition and was

1. Control browser window Size1 PackageCom.test.window;2 3 Importorg.openqa.selenium.Dimension;4 ImportOrg.openqa.selenium.WebDriver;5 ImportOrg.openqa.selenium.firefox.FirefoxDriver;6 7 Public classWindowSize {8 9 Public Static voidMain

First type: For loopLoop structure for statement format:for (initialize an expression; a conditional expression; an action expression after a loop) {circulation body; }eg:1 class dome_for2{2 public static void Main (string[] args) {3

1. 1 basic object-oriented conceptsThe basic idea of object-orientedObject-oriented is an emerging program design method, or a new program design specification (paradigm), its basic idea is to use object, class, inheritance, encapsulation, message

First, what is an arrayAn array can be understood as a huge "box" in which multiple types of data can be stored sequentially, such as an array of type int scores stores the scores of 4 students:Int[] scores={76,83,92,87};Where the name of the array

In order to solve the problem of "non-thread-safe", the method used in the previous section is to use the keyword synchronized to modify the methods that multiple threads may access at the same time, but there are some drawbacks to this writing,

Click to enter _ more _java thousand ask1. What is ATTACHAPI?The Attach API is a set of extension APIs provided by Sun, which is not a standard Java API. As the name implies, Attach, some programs are attached to the JVM. Simply put, a program is

Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, where "adjacent" cells is those horizontally or V Ertically neighboring. The same letter cell is used more than

Java multi-thread synchronization code block, java multi-thread synchronization /* Multi-thread security problems1. Why is there a security problem?When the program is running, a thread is qualified for execution after the judgment conditions are

IntelliJ IDEA14 and Maven series: Use IntelliJ IDEA 14 and Maven 7 to create java web Project (1), intellijmavenIntellij IDEA is the best Java IDE. It is relatively simple to create a Maven project. However, to create a Maven Web project, you still

Struts2 (2), struts2 (advanced tutorial)I. Action and MVC Struts2 is a web application framework based on MVC. It divides an application into three components: model, view, and controller. Model: contains the application business logic and business