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[] Introducing a sample program to find the difference between two dates in Java. In the sample program, the date to be compared is a string (yyyy/MM/dd) or java.util.Date. The calculation method to find the difference in dates is as follows. First two days...

[] Introducing a sample program that saves objects in XML format using Java. Use java.beans.XMLEncoder for XML output. We will also introduce a sample program that uses java.beans.XMLDecoder to restore a saved object. [] Plastic...

[] Introducing a sample program in Java that recursively searches for files from a specified directory, including subdirectories, and obtains a list of files that match the search conditions. These are equivalent to the UNIX command ls -R and the Windows command dir /s...

[FileChannel#transferTo] Introducing a sample program to copy files in Java. The sample program uses the New I/O java.nio.channels.FileChannel#transferTo method introduced in J2SE1.4. Buffer required for loading data...

[] Introducing a sample program that performs copy processing using input/output streams using java.io.InputStream and java.io.OutputStream in Java. In copy processing using streams, by increasing the read buffer size, even large files can be relatively...

[] Introducing a sample program in Java that displays a list of files in a specified directory. To display the file list, use the following method of the java.io.File class. list()...Files and directories contained in the specified directory...

[] This is a sample source for getting the extension from a file name in Java. [] /** * Returns the extension from the file name. * @param fileName File name * @return File extension */ public static String getSuffix(String fileName) { if (fileName == null) ...

[] This is a sample source that converts a URL in a string into a link (a href=...) using regular expressions in Java. 【】 /** Regular expression pattern for extracting URL */ public static final Pattern convURLLinkPtn = Pattern.compile ("(http://|https://){1}[\\w\\.\. ..

[] This is a sample source that returns the file name with the extension removed in Java. [] /** * Returns the file name without the extension. * @param fileName File name * @return File name */ public static String getPreffix(String fileName) {...

[] Introducing sample source that performs processing similar to the SQL functions LPAD and RPAD on strings in Java. These are very useful when dealing with fixed length formats. LPAD...Fills a repeated string to the left of a string and returns it so that the total number of characters is the specified number of digits...

[Java reflection made easy] Introducing a utility class that allows you to easily use Java's reflection API. [] Reflection API is included in the "java.lang.reflect" package, and is used to obtain information such as fields and methods from Java classes.

[] Introducing a useful Filter class that implements javax.servlet.Filter, analyzes the content of HTTP requests, and outputs logs. This log filter uses "java.util.logging.Logger" for log output, and you can change the information output by changing the log level.

[Function addition] The calling function can be used seamlessly from the internal web phone book. Please check how to use it by linking with the web phone book. Web phone book linking requires a business premium license or higher. Even deleted chat rooms can be safely used with the same name. Re-creation is now possible (*All users are v4.01.18...

[] Introducing a sample program that uses Java to extract the icon of a specified file into a png format image file. The specified file can be any executable file with an .exe extension, dll, xls, doc, etc. I searched the internet for similar methods...