The regular expressions module in Python provides a powerful tool for pattern matching in strings in Python. Regular expressions, also known as regex, make it possible for us to search, extract, and manipulate text based on specified patterns. One routine and common task in text processing is to identify non−word characters; these include symbols, punctuation marks, and spaces. In this article, we will explore various ways in which we can use regular expressions in Python to identify and match these non−word characters. We will take up a few code examples, each followed by stepwise explanations, to guide you through the ... Read More

Mastering regular expressions and their ‘re’ module opens up a world of powerful text−processing possibilities in Python. Regular expressions, often called regex, make it possible for us to identify, search for, and manipulate specific patterns within strings. One common task that we often come across in our work is matching a particular word in a text using regular expressions. In this article, we will take a deep dive into the art of using regular expressions in Python to find and match words in strings. We'll explore this domain using a few code examples, each followed by stepwise explanations, and this ... Read More

Maven is a powerful open-source project management tool developed by the Apache Group to build and manage any Java-based project. Additionally, this tool makes Java developers' work easier while developing reports, checking the builds, and testing automation setups. As we stated above, Maven is primarily used to build and manage many Java-based projects, Java eclipse project is the integrated development environment (IDE) that often hits to mind. Hence, by reading this article, you will learn everything about Maven automatic build tool and what it means in Java Eclipse Projects. Understanding Maven Maven is a popular automatic build tool that focuses ... Read More

Before running Java programs on your machine you need to set two environment variables namely, PATH − The path environment variable is used to specify the set of directories which contains executional programs. When you try to execute a program from command line, the operating system searches for the specified program in the current directly, if available, executes it. In case the programs are not available in the current directory, operating system verifies in the set of directories specified in the ‘PATH ’ environment variable. CLASSPATH − The class path environment variable is used to specify the location of the ... Read More

To get System.out.println() line in eclipse without typing the whole line type sysout and press Ctrl + space.

To get public static void main(String[] args) line in eclipse without typing the whole line type main and press Ctrl + space then, you will get the option for the main method select it.

Java does not support the concept of default parameter however, you can achieve this usingMethod overloadingUsing method overloading if you define method with no arguments along with parametrized methods. Then you can call a method with zero arguments.Variable argumentsIn Java methods parameters accept arguments with three dots. These are known as variable arguments. Once you use variable arguments as a parameter method, while calling you can pass as many number of arguments to this method (variable number of arguments) or, you can simply call this method without passing any arguments.ExampleLive Demopublic class Sample {    void demoMethod(String... args) {   ... Read More

Yes, you can define an interface inside a class and it is known as a nested interface. You can’t access a nested interface directly; you need to access (implement) the nested interface using the inner class or by using the name of the class holding this nested interface.ExampleLive Demopublic class Sample {    interface myInterface {       void demo();    }    class Inner implements myInterface {       public void demo() {          System.out.println("Welcome to Tutorialspoint");       }    }    public static void main(String args[]) {       Inner obj ... Read More

Yes, you can define a class inside an interface. In general, if the methods of the interface use this class and if we are not using it anywhere else we will declare a class within an interface.Exampleinterface Library {    void issueBook(Book b);    void retrieveBook(Book b);    public class Book {       int bookId;       String bookName;       int issueDate;       int returnDate;    } } public class Sample implements Library {    public void issueBook(Book b) {       System.out.println("Book Issued");    }    public void retrieveBook(Book b) { ... Read More

An interface with no methods in it is referred to as a tagging interface. There are two basic design purposes of tagging interfaces -Creates a common parent As with the EventListener interface, which is extended by dozens of other interfaces in the Java API, you can use a tagging interface to create a common parent among a group of interfaces. For example, when an interface extends EventListener, the JVM knows that this particular interface is going to be used in an event delegation scenario.Adds a data type to a classThis situation is where the term, tagging comes from. A class that ... Read More