Object Oriented Programming Articles - Page 867 of 915

Yes, it is similar to a new keyword of C++. a new keyword is used to initialize/create an object. See the following example −Employee employee = new Employee();Here new keyword is used to create an object of class Employee.new Employee() invokes the constructor of the class Employee.new keyword can also be used without assigning the object to a reference variable. See the example −String name = new Employee().getName();Here we are creating an object using new keyword and then invoked a method getName() on the object and passed the result to a variable.

Java follows camel casing for objects, class, variables etc. If a name is having multiple words, the first letter is small then consecutive words are joint with the first letter as a capital case. Consider the following example − Taxation Department Class - TaxationDepartment Object - taxationDepartment Method - getTaxationDepartmentDetails Variable - taxationDepartment

Following the the best practices while declaring a variable.  These best practices maintains code readability, understandability as project code size increases.Variables names should be short or long enough as per the scope. For example, loop counter variable, i is fine whereas employee as loop variable.Specific words should not be used like equals, compare, data.Use meaningful names which can explain the purpose of the variable. For example cnt Vs counter.Don't use _ to declare a variable name, Use camel casing. For example, employeeName is better than employee_name.Each organization has its own syntax specific standards. Follow those rules to maintain consistency and ... Read More

All Java components require names. Names used for classes, variables and methods are called identifiers. The naming conventions for different Java components are as follows: Package Naming Convention Class Naming Convention Interfaces Naming Convention Method Naming Convention Constants Naming Convention Variables Naming Convention Quick Summary Package Naming Convention Naming conventions for Java packages typically involve using lowercase letters. It's common to use ... Read More

In this article, we will learn about the purpose of private constructor in Java. Constructor is a unique method used to initialize objects. Constructors are public or protected by default, which allows outside classes to create instances Why Use a Private Constructor? Private constructor is mainly applied to manage object creation. It does not allow other classes to instantiate the class, creating particular design patterns or restrictions. Purpose of a Private Constructor The private constructor is useful in case we want to restrict the object creation. For example − Singleton pattern can be implemented using ... Read More

Yes, a variable can be downcast to its lower range substitute by casting. It may lead to data loss although. See the example below −ExampleLive Demopublic class Tester {      public static void main(String[] args) {       int a = 300;         byte b = (byte)a;         System.out.println(b);    }   }OutputIt will print output as −44

Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object. Method overriding by a subclass is termed as runtime polymorphism. JVM determines the method to be executed at runtime instead of compile time. exampleLive Democlass SuperClass {    SuperClass get(){       System.out.println("SuperClass");       return this;    } } public class Tester extends SuperClass {    Tester get(){       System.out.println("SubClass");       return this;    }    public static void main(String[] args) {       SuperClass tester = new Tester();         tester.get();    }   }OutputSubClass

This article will help you understand what a Marker or Tagged Interface in Java is. Before understanding marker interface, let’s revise on Interface. INTERFACE Similar to an object, an Interface is a blueprint of a class. It consists of static constants and abstract methods. It is a mechanism to achieve abstraction and multiple inheritance in Java. It is declared using the interface keyword. It provides total abstraction, meaning all methods in an interface must be declared with empty body, and all fields must be public, static and final by default. Syntax interface { // constant fields declaration ... Read More

No. It is not allowed in Java. Compiler will fail the compilation throwing error that the blank final field may not have been initialized.

No. It is not allowed in Java. The compiler will fail the compilation throwing error that the blank final field may not have been initialized.