Programming Articles - Page 2017 of 2501

We can use PHP ZipArchive class in order to zipping and unzipping the folder in PHP. As of PHP 5.3, this class is inbuilt. For using in windows users need to enable php_zip.dll inside of php.ini.Example

Yes, Python support both Object  Oriented and Procedural  Programming language as it is a high level programming language designed for general purpose programming. Python are multi-paradigm, you can write programs or libraries that are largely procedural, object-oriented, or functional in all of these languages. It depends on what you mean by functional. Python does have some features of a functional language. OOP's concepts like, Classes, Encapsulation, Polymorphism, Inheritance etc.. in Python makes it as a object oriented programming language. In Similar way we can created procedural program through python using loops ,for ,while etc ..and control structure.Exampleclass Rectangle:    def __init__(self, length, breadth, ... Read More

We  not only use lists to store a collection of values, but we also use it to perform some mathematical calculations or operations to do.Example 1import math data = 21.6 print('The floor of 21.6 is:', math.floor(data))OutputThe floor of 21.6 is: 21How To Calculate the Weighted Average of a ListExample 2cost = [0.424, 0.4221, 0.4185, 0.4132, 0.413] cases = [10, 20, 30, 40, 50] cost = [23, 10, 5, 32, 41] weight= [10, 20, 30, 40, 50] for i in range(len(cost)): cost[c] = (cost[i] * weight[i] / sum(weight)) cost = sum(cost) print(cost)Output72.84444444444445Example 3import math degree = 180 radian = math.radians(degree) ... Read More

A method is a collection of statements that are grouped together to perform an operation. In Java, you can define a method having the same name as the class but it is not recommended as per the coding standard. Can We define a Method Having Same as Class? Yes, It is allowed to define a method with the same name as that of a class. There is no compile-time or runtime error will occur. But this is not recommended as per coding standards in Java. Normally the constructor name and class name always the same in Java. Example of a ... Read More

Singleton Pattern ensures that a class has only one instance and provides a global point to access it. It ensures that only one object is available all across the application in a controlled state. Singleton pattern provides a way to access its only object which can be accessed directly without the need to instantiate the object of the class.ExampleOutputconnection createdExplanationIn the above example as we are following a singleton pattern so the object $db2 can't be created. Only a single object will be created and i.e available all across the application.

GZIP Compression is a simple, effective way to save bandwidth and speed up PHP application. The mechanism runs behind the GZIP compression is described below −Step1The browser/client request for a file to the server.Step2The server sends a .zip file to the browser (index.html.zip) rather than plain old index.html in response, due to which the download time and bandwidth decreases.Step3After the execution of the above step, the browser downloads the zipped file, extracts it, and then shows it to the user. This loads the webpage very quickly.In the Apache server, we have to Add the following to .htaccess file to enable ... Read More

Java constructor is a special method used to initialize objects. It has the same name as the class and is automatically called when an object is created. You can also declare a constructor as private to restrict object creation from outside the class. What is a Private Constructor? A private constructor is a constructor that is declared using the private access modifier. It restricts object creation from outside the class i.e., the class having a private constructor cannot be subclassed. Private constructors are used in design patterns like Singleton, or to prevent subclassing or instantiation. Purpose of a Private ... Read More

Any method that is declared as final in the superclass cannot be overridden by a subclass. If we try to override the final method of the super class, we will get a compile-time error.  Rules for Implementing Method Overriding The method declaration should be the same as that of the method that is to be overridden. The class (subclass) should extend another class (superclass), prior to even try overriding. The Sub Class can never override final methods of the Super Class. Final method A method is declared final when ... Read More

In this article, we will be learning about ClassCastException in Java. But before we jump into this, we'll understand what an exception is in Java. After that, we'll learn why and when ClassCastException occurs, look at real-world code examples that throw this exception, and finally learn how to avoid or resolve it. What is an Exception in Java? An exception in Java is an event that disrupts the normal flow of the program. Java provides a way to handle these errors gracefully using try-catch blocks. There are 2 types of exceptions: Checked Exceptions – ... Read More

Python supports a feature known as multiple inheritance, where a class (child class) can inherit attributes and methods from more than one parent class. This allows for a flexible and powerful way to design class hierarchies. To manage this, Python provides the super() function, which facilitates the calling of methods from a parent class without explicitly naming it. Understanding Multiple Inheritance In multiple inheritance, a child class can derive attributes and methods from multiple parent classes. This can be particularly useful in scenarios where you want to compose behavior from different sources. Example In the following example, the Child class ... Read More