What is constructor overloading and overriding in Java?

The constructor overloading can be defined as the concept of having more than one constructor with different parameters so that every constructor can perform a different task. Consider the following Java program, in which we have used different constructors in the class.

How can constructors be overridden?

Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden.

What is meant by overriding in Java?

In any object-oriented programming language, Overriding is a feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super-classes or parent classes.

What is constructor overriding overloading?

There is constructor overloading, i.e. providing different argument sets. Constructor looks like a method but name should be as class name and no return value. Overriding means what we have declared in Super class, that exactly we have to declare in Sub class it is called Overriding.

Why do we use overriding?

The benefit of overriding is: ability to define a behavior that’s specific to the subclass type, which means a subclass can implement a parent class method based on its requirement. In object-oriented terms, overriding means to override the functionality of an existing method.

Can constructor be synchronized in Java?

Note that constructors cannot be synchronized — using the synchronized keyword with a constructor is a syntax error. Synchronizing constructors doesn’t make sense, because only the thread that creates an object should have access to it while it is being constructed.

What is the difference between constructor overloading and override in Java?

There is constructor overloading, i.e. providing different argument sets. Constructor looks like a method but name should be as class name and no return value. Overriding means what we have declared in Super class, that exactly we have to declare in Sub class it is called Overriding.

Why can’t we call overridden methods in constructor?

For this reason calling overridden (or overriddable) methods in a constructor is not good practise. it is not overriding super class constructor and constructor can not be overridden it can be overloaded. When you create child class object super class will be instantiated first then sub class will be instantiated.

What is overriding in Java?

Overriding happens when a subclass has the same name, number/type of parameters, and the same return type as an instance method of the superclass. In this case, the subclass will overridethe superclass’s method.

What is the return type of @constructor in Java?

Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class’s constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.