Constructor in Java

Constructor in java is a special function that is used to initialize member variables of a class. Some of the key features of constructors are:

1. Constructor is by the name of class.
2. Default constructor is created automatically if no constructor is created by the user. If user creates a constructor then no default constructor will be created automatically.
3. Constructor overloading can be done by changing arguments in signature of constructor.
4. Access specifiers such as public, private or protected can be applied to constructors. There visibility for constructors is similar to normal functions. Example: private constructor can be accessed within the class only.
5. We can call constructors within the class or the parent class using keywords ‘this‘ and ‘super‘ respectively. This is called as Constructor Chaining.
6. We cannot define any return type to constructor. Constructors by default return instance of the class.

To understand the above features in detail we have divided them in few sections :-

• Default Constructors
• Parameterized Constructors
• Constructor Chaining
• Constructor Overloading