A constructor in Java is a special method that is used to initialize objects. It is called when an object of a class is created. The constructor has the same name as the class and has no return type. It can be used to set initial values for object attributes. If a class doesnt have a constructor, the Java compiler automatically creates a default constructor during run-time.
Constructors can also take parameters, which are used to initialize attributes. There are different types of constructors in Java, such as default constructor, no-arg constructor, parameterized constructor, and constructor overloading.
Rules for creating a constructor in Java are:
- The name of the constructor should be the same as the class.
- A Java constructor must not have a return type.
It is not necessary to write a constructor for a class, but if you dont create a class constructor yourself, Java creates one for you.
