Java General Java Constructors Tutorial

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Tutorial: Java General Java Constructors Tutorial

A constructor is used when creating an object from a class. The constructor name must match the name of the class and must not have a return type. They can be overloaded, but they are not inherited by subclasses.

Tutorial Details:

Java Constructors

A constructor is used when creating an object from a class. The constructor name must match the name of the class and must not have a return type. They can be overloaded, but they are not inherited by subclasses.

Invoking constructors
A constructor can be invoked only from other constructors. To invoke a constructor in the same class, invoke the this() function with matching arguments. To invoke a constructor in the superclass, invoke the super() function with matching arguments. When a subclass object is created, all the superclass constructors are invoked in the order starting from the top of the hierarchy.

Default constructors
The compiler creates the default constructor if you have not provided any other constructor in the class. It does not take any arguments. The default constructor calls the no-argument constructor of the superclass. It has the same access modifier as the class.

However, the compiler will not provide the default constructor if you have written at least one constructor in the class. For example, the following class has a constructor with two arguments defined in it.

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