Programming Articles - Page 2561 of 3363

Static blockThe static blocks are executed at the time of class loading.The static blocks are executed before running the main () method.The static blocks don't have any name in its prototype.If we want any logic that needs to be executed at the time of class loading that logic needs to placed inside the static block so that it will be executed at the time of class loading.Syntaxstatic {    //some statements }ExampleLive Demopublic class StaticBlockTest {    static {       System.out.println("Static Block!");    }    public static void main(String args[]) {       System.out.println("Welcome to Tutorials Point!");    } }OutputStatic Block! ... Read More

When a program or function statement is executed, the current values of formal parameters are saved (on the stack) and within the scope of the statement, they are bound to the values of the actual arguments made in the call. When the statement is exited, the original values of those formal arguments are restored. This protocol is fully recursive. If within the body of a statement, something is done that causes the formal parameters to be bound again, to new values, the lambda-binding scheme guarantees that this will all happen in an orderly manner.there is only one binding for x: ... Read More

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