Nisha Yadav Interview Questions, OOP One comment

Does Constructor Return Any Value?

To find out whether constructor returns any value or not, let’s learn about a constructor? In simple terms, the constructor is a special method, which is used to initialize an instance of a class. This special method differs from the actual methods of classes. The name of a constructor is always similar to the name of the class. Below is an example of a constructor:

public class Complex {

  //This is the constructor

  Complex(){

  }

  ..

}

public class Complex {

//This is the constructor

Complex(){

}

How Constructor Work? Consider an example:

public class Student {

  String name;

  //Constructor

  Student(){

    this.name = "Hello constructor";

  }

  public static void main(String[] args) {

    Student obj = new Student();

    System.out.println(obj.name);

  }

}

public class Student {

String name;

//Constructor

Student(){

this.name = "Hello constructor";

}

public static void main(String[] args) {

Student obj = new Student();

System.out.println(obj.name);

}

OUTPUT: Hello constructor The object is built

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Why main method is static in Java?

One of the well-establish and most common programming languages is Java. Java came into existence in 1995. And to that date, C and C++ languages consistently widespread in the world of computer science. The ambition to make Java is to build familiarity, security, and portability of data. The main reason to make Java language is to make application programs independent of the hardware system to which the program is running. JVM (Java virtual machine) comes under the category of Abstract

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Difference between Constructor and Method in Java

Java is an Object-Oriented Programming language. Therefore, the data and the member functions in Java are present in the classes. The classes in Java contain both constructors and methods as well. Let’s see in detail about methods and constructors and their differences. Constructor The purpose of constructors is to initialize the objects, which are the instances of the classes. Similar to the methods, the constructors also hold statement blocks that get executed during the run time of the program. Constructors

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What is the Purpose of Default Constructor in Java

In object-orientated programming, the constructor plays an important role. A constructor is similar to the member functions of the class. However, their signature and purpose differ. The constructors have no return type, unlike the methods. Also, the constructor name always matches with the class, which makes it easily identifiable. In general, there are three types of constructors: Default Constructor No-Argument Constructor Parameterized Constructor Out of these, the default constructor is a constructor which the java compiler itself includes within the

Nisha Yadav Interview Questions, OOP One comment

What is Object Oriented Paradigm in Java?

The term Programming paradigm means the methodology for writing program codes. In general, two paradigms govern how you can construct a program. These two ways are: a process-oriented model an object-oriented model Many programming languages support both the paradigms like python. Python allows the users to code using both process-oriented and object-oriented methodologies. However, Java is exclusively object-oriented. What is Object Oriented Paradigm The object-oriented programming paradigm (OOP) has a completely different approach to problem-solving. It does not focus on the problem

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What are the Advantages of Packages in Java?

Half of the programming world love java language. Java is an open-source with enormous features that make java convenient. Java is platform-independent, which gave rise to the concept ‘wora’ means one’s you’ve written your application, it can run across any device or machine. Out of all the features, java provides the programmer’s the concept of packages. What are Packages? Packages are an assemblage of classes, subpackages and interfaces categorized in divergent directories according to their functionality, usability, and the categories

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What are the Various Access Specifiers for Java Classes?

Access Specifiers restricts access to classes, interfaces, methods, and fields in Java. It sets the domain of the specific Field, Method, or Class. In simple terms, the specifiers determine whether the particular method or field can be accessed by another sub-class or Class. Access Specifier and Access Modifier, both the terms are used simultaneously and, they mean the same thing. Before we talk about Access Specifiers or Access Modifier type, first we need to understand what is the use of

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Can We Have Multiple Classes in Same Java File?

Yes, we can have multiple classes in same java file. But, there is one restriction over here, which is that you can have as many classes in one file but only one public class is allowed. If we try to declare 2 classes as public in the same file, the code will not compile. The reason being is you need to name the file with the name of the class which is declared as public and we cannot have the

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