cool java programs

The whole process of compiling and running Java is quite tedious, and this article simply explains the whole process through a simple program.For example, a Java program is created from a source file to a program that takes two major steps: 1, the source file is compiled by the compiler into bytecode (bytecode) 2, and the bytecode is run by the Java Virtual machi

　　First create a folder Antstudy (project folder)Build another src folder (as source code directory)Put Java programs insideBuild a Build.xml file under the Antstudy directory aboveUse Ant's Javac task to compile Java programs

name)??? Successive next next, enter the media interface,Double-click New Media file? Installer Select Windows, then next next Enter ${compiler:sys.fullname} in the first text box, meaning the full name of the file. Enter the path to the software you want to install in the text box below, which is empty. Click Next Click Next to step Sixth, select the JRE environment, because I have the JRE installed on my machine, so I choose the first item, Then nextThe most importan

Java is produced along with the tide of the Internet. It has internal support for networks and multithreading and has all the features of programming languages in the Network Age. From the current Java application, JavaIt is mainly used for network programming on the Internet or LAN, and the trend of using Java as the mainstream network programming language is be

1. BackgroundUse sockets for interprocess communication between Java programs and C programs. This paper mainly describes the Java implementation function of the client side which communicates with C program.1.1. Language of UseClient side: JAVA,JVM (JDK1.3)Server side: C,un

Today, when writing the constructor method, there is a small problem, caused by this problem a series of thinking, in a Java class in the initialization of variables and classes what is the order of execution?# # problems found classstudent{PrivateString name; voidsetName (String name) { This. Name =name; } String GetName () {returnname; } Student () {//This (this.name); This(name); System.out.println ("The topic asks for an argument-free cons

When writing Java programs, sometimes we need to invoke other programs or scripts such as Exe,shell. There are two methods available in Java to start other programs: (1) using the runtime's Exec () method(2) using the Processbuilder start () methodRuntime and Processbulider

), etc. Why is the JRE included in the JDK? 1th: The development of Java programs, you need to test the program, run to see the effect, so these operations need to have the support of the JRE2nd: The development tools in the JDK are actually developed in the Java language, packaged as. exe files for ease of use, and cannot be run without the JRE.

1. Extension hiddenThe file name extension causes compilation to fail. Display the hidden file extension.2. Illegal character errorAs long as it is illegal to see the characters, it is definitely a Chinese and English issue.Because we require all symbols to be in English state.3. Pay attention to case-sensitive issuesClass--ClassString--stringSystem--System4. The corresponding problem of parenthesesIn a Java program, the parentheses appear in pairs. S

Different versions of the differenceThe following code:Interface myinterface{public void DoSomething ();} Class Myimpl implements myinterface{@Overridepublic void DoSomething () {}public void Dotest (listThe above code compiles on the jdk1.6 version without any problems, but compiling the above code on the jdk1.5 version will make an error:themethod dosomething of type Myimpl Override a superclass ... jdk1.5 @Override is strict adherence to the definition of overwrite: The subclass method

Org.apache.catalina.core.ApplicationContext LogInfo: Specify the end of the scheduled task executionI was called by the thread pool to execute! Parameters: 12011-3-31 18:26:56 Org.apache.catalina.core.ApplicationContext LogInfo: Start execution of specified scheduled tasksClaiming to run every 10 seconds Oh! I'm going to call the thread pool to perform another task.I was called by the thread pool to execute! Parameters: 22011-3-31 18:26:56 Org.apache.catalina.core.ApplicationContext LogInfo: Sp

remember that such messages are reasonable in desktop applications, except for the purpose of debugging, it may be undesirable to bring up a message box on your server in any situation. Note: You can also callsetAllowUserInteraction()Function. However, on Sun's 1.2 VM (test the following code), the message box is not displayed even if the parameter of this function is set to true. URL url = new URL("https://[your server]");URLConnection con = url.openConnection();//causes the VM to display a di