Programming Articles - Page 2502 of 3363

A static member (method/variable) belongs to the class and it will be loaded into the memory along with the class. You can invoke it without creating an object. (using the class name as reference). There is only one copy of the static field available throughout the class i.e. the value of the static field will be same in all objects. You can define a static field using the static keyword.Examplepublic class Sample{    static int num = 50;    public static void demo(){       System.out.println("Value of num in the demo method "+ Sample.num);    } } public class ... Read More

Factory pattern is a design pattern (creational pattern) which is used to create multiple objects based on the data we provide. In it we create an object abstracting the process of creation.ExampleBelow given is the example implementation of the factory pattern. Here, we have an interface with name Employee and 3 classes: Student, Lecturer, NonTeachingStaff, implementing it. We have created a factory class (EmployeeFactory) with a method named getEmployee(). This method accepts a String value and returns an object of one of the classes, based on the given String value.import java.util.Scanner; interface Person{    void dsplay(); } class Student implements ... Read More

Whenever you return values from a static method they are either static nor instance by default, they are just values.The user invoking the method can use them as he wants. i.e. you can retrieve the values and declare them static.But, since you cannot declare variables of a method static if you need to declare the vales returned by a method static you need to invoke it in the class outside the methods.ExampleAssume we have a class with name Demo as −class Demo{    int data = 20;    public Demo(int data){       this.data = data;    }   ... Read More

The static methods belong to the class and they will be loaded into the memory along with the class. You can invoke them without creating an object. (using the class name as reference).Examplepublic class Sample{    static int num = 50;    public static void demo(){       System.out.println("Contents of the static method");    }    public static void main(String args[]){       Sample.demo();    } }OutputContents of the static methodThe "this" keyword is used as a reference to an instance. Since the static methods doesn’t have (belong to) any instance you cannot use the "this" reference within ... Read More

A static filed/variable belongs to the class and it will be loaded into the memory along with the class. You can invoke them without creating an object. (using the class name as reference). There is only one copy of the static field available throughout the class i.e. the value of the static field will be same in all objects. You can define a static field using the static keyword.Examplepublic class Sample{    static int num = 50;    public void demo(){       System.out.println("Value of num in the demo method "+ Sample.num);    }    public static void main(String ... Read More

In this article, we will see how to extract details about Youtube videos and download them in different formats using the pafy module. Head over to the link for official documentation.Install the pafy module using the following commandpip install pafyIf you run the above command, it will generate the following results on the successful installation of the module pafy.Collecting pafy Using cached https://files.pythonhosted.org/packages/b0/e8/3516f761558525b00d3eaf73744eed5c267db 20650b7b660674547e3e506/pafy-0.5.4-py2.py3-none-any.whl Installing collected packages: pafy Successfully installed pafy-0.5.4Check whether you can import the pafy module or not by running the following command.import pafyIf you found no errors then it's done. Otherwise install the following module to solve ... Read More

A static method or, block belongs to the class and these will be loaded into the memory along with the class. You can invoke static methods without creating an object. (using the class name as reference).Where the "super" keyword in Java is used as a reference to the object of the superclass. This implies that to use "super" the method should be invoked by an object, which static methods are not.Therefore, you cannot use the "super" keyword from a static method.ExampleIn the following Java program, the class "SubClass" contains a private variable name with setter and getter methods and an ... Read More

A static filed/variable belongs to the class and it will be loaded into the memory along with the class. You can invoke them without creating an object. (using the class name as reference). There is only one copy of the static field available throughout the class i.e. the value of the static field will be same in all objects. You can define a static field using the static keyword.Examplepublic class Sample{    static int num = 50;    public void demo(){       System.out.println("Value of num in the demo method "+ Sample.num);    }    public static void main(String ... Read More

The static methods belong to the class and they will be loaded into the memory along with the class. You can invoke them without creating an object. (using the class name as reference).Examplepublic class Sample{    static int num = 50;    public static void demo(){       System.out.println("Contents of the static method");    }    public static void main(String args[]){       Sample.demo();    } }OutputContents of the static methodThe "this" keyword is used as a reference to an instance. Since the static methods doesn’t have (belong to) any instance you cannot use the "this" reference within ... Read More

An exception is an issue (run time error) occurred during the execution of a program. When an exception occurred the program gets terminated abruptly and, the code past the line that generated the exception never gets executed.Exampleimport java.util.Scanner; public class ExceptionExample {    public static void main(String args[]) {       Scanner sc = new Scanner(System.in);       System.out.println("Enter first number: ");       int a = sc.nextInt();       System.out.println("Enter second number: ");       int b = sc.nextInt();       int c = a/b;       System.out.println("The result is: "+c);   ... Read More