cool java programs

[Reseller Note] For many application systems, dynamic loading and execution classes and code snippets are often required, which facilitates deployment simplicity and system design flexibility. This article provides a comprehensive introduction, which is worth your reference.In Sun JDK 1.2 and later versions, it contains a group of APIs that can compile and execute Java code at runtime. These APIs are included in the tools. jar class library. This func

1. The Java language is special, a program written by Java requires a compilation step, but this compilation step does not produce a specific platform machine code, but instead generates a platform-independent bytecode (that is, a . class file ). This bytecode is not executable and must be interpreted using the Java interpreter. Therefore, it can be considered th

the application. 4, the level of competition is not true Different levels of shared data and execution of local computing will show a different level of competition, with different performance and scalability 5, the elimination of useless code The compiler may delete code that is meaningless or does not produce results or predictable results Make the results as unpredictable as possible Iv. Other test methodsCode review (Manual Check Code), Race Analysis too

Entering the 21st century, the information industry has grown rapidly, in software development, the Java language and C # language are independently, has been gradually improved and widely used, the Java language and C # language is an object-oriented language, but Java programs and C #

Now, we use the Java language to write for the Palm OS Program The fields are not completely unified, and there are also many differences. Currently, there are several available application interfaces on the market, each application interface provides different access permissions to the current Palm OS application. Perhaps everyone is most familiar with Sun Microsystems, but it is not the only product that can write

tests make people more confident-the ideal test must be updated before the new features are added. 2. Who will write unit tests and when to compose unit tests Program code testing can be very tedious, especially when you're a programmer, particularly when it comes to testing other people's programs. But programmers like to write programs, so why not let programmers write

Recently made a Java SE program. Use the thread pool to handle high concurrency tasks. There are query database operations during task processing, which results in very slow task handling. Then find the information on the Internet. The final solution is now to summarize the relevant considerations. First, on the thread pool considerations. For multiple tasks, the thread pool is best not to be public. The thread pool should be separated from the code f

word| Program | Convert Jacob is a COM bridge under Java and Windows, through which we can invoke COM components in Java programs. If your JDK is 1.4, then you need to download Jacob1.9 's JNI library to work properly, and earlier versions have some problems with JDK1.4. Package com; /***〈p〉title:word Document Turn HTML Cla

-on user.Three. Why should the Java program run as a service?If you run a Java program using the command line, you can run the command as a script (such as a bat script), but the command line is inconvenient, such as the command Line window cannot be closed, the shutdown is stopped, so the maintenance personnel are prone to misoperation (close the window to stop the program), if the server is down or other

Writing high-quality code: 151 suggestions for improving Java programs (Chapter 1: String ___ suggestion 56 ~ 59), java151Suggestion 56: freely select the String concatenation Method There are three methods to concatenate a string: the plus sign, the concat method, and the append method of StringBuilder (or StringBuffer, because the StringBuffer method is the same as the StringBuilder method, which is not d

10 errors that Java programmers often make when writing SQL programs Java Programmers need to mix Object-oriented Thinking and general imperative programming methods in programming. Whether the two can be perfectly combined depends entirely on the programmer's level: Skills (anyone can easily learn imperative programming) Mode (some people use "Mode-mode". For e

The question is presented as follows: Suppose that there are some forms in our HTML page that need to be processed, and we need to initialize the fields in the database, what should we do? The standard solution is to use CGI scripts or server-side programs such as the Java servlet, but have you ever thought of writing a script that allows you to use JavaScript directly to invoke a server-side

After the JAVA program is developed, it needs to be deployed to the server. If it is a WEB project, it needs to be deployed to the WEB server; otherwise, it will be deployed to the application server. JAVA is a cross-platform programming language. The operating system of the server can be Windows, Linux, or other programming languages. The Redhat6 operating system is used below, Deploy

"Hello World" applet test, if not successfully recommend to the Internet to search the installation process.Down to the most important OPENCV debut. Currently the latest version of OpenCV is 3.1.0, so the latter are based on OpenCV3.1.0. Using Java development programs is not as complex as Visual Studio environment configuration, because Java is a method that ca

. If the standard error is a terminal, redirect all output of the specified command to the standard error as standard output to the same file descriptorThis means that our Java program runs in the background, and the log recorded by the program to $log_file,> means write (clear the content before writing the content),>> means appendThe meaning of 2>1For 1 More accurate should be the file descriptor 1, and 1 is generally representative of Stdout_filen

Java uses Runtime to call code blocked by external programs. javaruntime Sometimes some external programs are called in java code, such as SwfTools to convert swf and ffmpeg to convert videos. If your code is written as follows: runtime.getruntime(cmd.exe c (command), you will find that the program is executed in one c

;The compiler processes int a = 3 First, it creates a reference to a variable in the stack, and then finds out if there is a value of 3 in the stack, and if it does not, it stores the 3 in and then points a to 3. then the int b = 3 is processed, and after the reference variable of B is created, because there are already 3 values in the stack, B points directly to 3. In this case, A and B both point to 3. At this point, if you make a=4 again, then the compiler will re-search the stack for 4 value

Mac OS X Java-based programs (such as IntelliJ idea, jEdit, etc.) will appear invalid Chinese punctuation input, in the Chinese input method state, you can enter the Chinese characters, but the input punctuation at the end of the English punctuation. Read the relevant information, originally this is Java's own bug. This bug has occurred since the Java 8u51 versio

steps are as follows:ADD Action Select: (Batch) fill in the following information:Comment:start MySQL Service (custom)Script:net Start MySQL5Continue adding a batch action to set up the service boot.Fill in the following information:Comment:set MySQL AutorunSCRIPT:SC config MySQL5 start= AutoThe MySQL configuration is complete.3. Configure Tomcat, as above, to register Tomcat as a system service, start Tomcat, and set it to start automatically:Registering a service, adding a batch actionComment

Current Environment descriptionPython3.5Java1.8Windows7 x86Installation methodPip Install Jpype1Note: There's really 1 behind Jpype.Issue 1:error:microsoft Visual C + + 14.0 is required."Cause analysis"Missing Microsoft Visual C + + 14.0 and later"Workaround"Download install Microsoft Visual C + + Build Tools 2015To add, this package needs to be installed in a Framework4.5.1 environmentPython environment: Install Jpype to invoke Java