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Constructor java archive#

Here, the result is clearly an instance of Class Car. We are actually creating new object by allocating memory and calling the constructor. Here we doesn’t have any explicit return type but when you instantiate the class with the syntax Car c1 = new Car() Similar to methods, reflection provides APIs to discover and retrieve the constructors of a class. Typically it performs operations required to initialize the class before methods are invoked or fields are accessed. The answer is the Constructor cannot return any explicit value but implicitly it will be returning the instance of the class. A constructor is used in the creation of an object that is an instance of a class. Output : Color of the Car is : Blue Can a Constructor return any value ? In the below example we have a parameterized constructor for the car class which set the value for the parameter “carColor” public class Car Output : Default Constructor of Car class called Parameterized ConstructorĪ Constructor which has parameters in it called as Parameterized Constructors, the Parameterized constructor is used to assign different values for the different objects.

("Default Constructor of Car class called") In the below code we have created the no-arg constructor which gets called during the time of object creation (Car c = new Car()) public class Car

Default Constructor (or) no-arg Constructorĭefault Constructor (or) no-arg constructorĪ Constructor with no parameters is called as Default Constructor or no-arg constructor.

There are two type of Constructors in Java, they are

Constructor java archive#

Its available in PDF/ePUB/MOBI formats and includes the archive with code examples in Java, C, C++, PHP. For example we cannot have constructor like public void Test() Types of Java Constructors Check out our ebook on design patterns and principles.

We cannot declare a constructor with return type.

A Constructor cannot have a explicit return type.

Suppose if we have class Test, Then constructors name also should be “Test” and not anything else.

A Constructor name should be the same name as the class name.

There are two important rules which has to be kept in mind before creating a constructor. Rules for creating a Constructors in Java This will invoke the default constructor of the Test class.