Programming Articles - Page 3326 of 3366

While choosing an identifier to declare a variable in Java you need to keep the following points in mind. The name of the variable should begin with either alphabet or, an underscore (_) or, a dollar ($) sign. The identifiers used for variables must not be keywords. No spaces or special characters are allowed in the variable names of Java. Variable names may contain 0 to 9 numbers (if not at the beginning). Variable names are case sensitive i.e. MY_NUM is different from my_num. If you use two words in a identifier then the you should follow camel case ... Read More

There will be times when we need to remove files programmatically in Python. Removing files, in this context, is the act of deleting or erasing files from a computer's file system using Python programming language. You must know that when you remove a file, it is permanently deleted from the storage location; this frees up disk space and makes the file inaccessible. Python has a number of modules and functions, such as os.remove() or os.unlink(), that permit you to interact with the operating system and remove files using code. This functionality is particularly useful when we want to automate tasks, ... Read More

While writing a method name we should follow the camel case i.e. first letter of the first word should be small and the first letters of the remaining (later) words should be capital. Example public class Test { public void sampleMethod() { System.out.println("This is sample method"); } public void demoMethod() { System.out.println("This is demo method"); } public static void main(String args[]) { Test obj = new Test(); obj.sample(); obj.demo(); } } Output This is sample method This is demo method

While writing class names you need to keep the following points in mind. You shouldn’t use predefined or existing class names as the name of the current class. You shouldn’t use any Java keywords as class name (with the same case). The First letter of the class name should be capital and remaining letters should be small (mixed case). class Sample Likewise, first letter of each word in the name should be capital an remaining letters should be small. class Test Keeping interface names simple and descriptive is suggestable. Better not ... Read More

You can use the tempfile module to create a unique temporary directory in the most secure manner possible. There are no race conditions in the directory’s creation. The directory is readable, writable and searchable only by the creating user ID. Note that the user of mkdtemp() is responsible for deleting the temporary directory when done with it. To create a new temporary directory, use it as follows −import tempfile _, temp_dir_path = tempfile.mkdtemp() # Do what you want with this directory # And remove the directory when doneNote that you need to manually delete this directory after you're done with ... Read More

Identifiers in Java are case-sensitive, therefore, hello and Hello are considered as two different identifiers.

Temporary files are created to store data temporarily during the execution of a program or while working with large amount of data. To create a temporary file we can use the tempfile module, as it creates unique names and stores in platform-dependent default location . Specifically the tempfile module is used as the files created using this module are deleted as soon as they are closed.  Creating a Temporary File A temporary file is created using the TemporaryFile() function of the tempfile module. This by default opens the file in 'w+b' mode, which allows to both read and write the ... Read More

KeywordsKeywords in Java convey a special meaning to the compiler therefore, these cannot be used as identifiers. Java provides a set of 50 keywords.abstractcontinuefornewswitchassertdefaultgotopackagesynchronizedbooleandoifprivatethisbreakdoubleimplementsprotectedthrowbyteelseimportpublicthrowscaseenuminstanceofreturntransientcatchextendsintshorttrycharfinallongstrictfpvolatileconstfloatnativesuperwhileReserved wordsAmong the list of key words list mentioned above the key words goto and const are currently not in use. They are reserved words (for the future use).

A valid identifier in java – Must begin with a letter (A to Z or a to z), currency character ($) or an underscore (_). Can have any combination of characters after the first character. Cannot be a keyword. Example Following example shows various possible identifiers used to declare a variable in Java. Live Demo public class VariableTest { public static void main(String args[]) { // Declaring a variable named num int num = 1; ... Read More

The act of renaming multiple files recursively in Python can be a useful task when it is required to change the names of multiple files within a directory and its subdirectories. If you need to replace certain characters, add prefixes or suffixes, or completely change the file names, Python has powerful tools to accomplish such operations. In this article, we explore a few different approaches to renaming multiple files recursively using Python. We consider some code examples, each demonstrating a unique method to achieve this task. So let us get started right away and learn how to rename multiple files ... Read More