Types of constructor in java

 There are 3 types of constructor in java

        

Default constructor 

Parameterized constructor 

Parameterless constructor

 Default constructor 

  If we do not define any constructor then compiler generates one constructor for class is called          default constructor. 

 Compiler generated default constructor is parameterless. 

 Compiler never generate default parameterized constructor, if we want to define instance of a class by passing arguments then we must define parameterized constructor inside class

Parameterized Constructor

If we define constructor of a class having one or more parameter then it is called parameterized constructor.

  When we create instance of a class by passing arguments then matching parameterized constructor gets called.

  Example:

 public Employee(int empId,String empName,String companyName)

{ 

}

 Employee employee=new Employee(123,”bob”,”Vodafone”)

ParameterlessConstructor

If we define constructor of a class without any parameter then it is called parameterless constructor or zero argument constructor. 

 When we create instance of a class without passing any argument then parameterless constructor of a class get called. 

 It is also called as zero argument constructor or user defined default constructor. 

 Example:

 public Employee(){ } 

Employee employee=new Employee()

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