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How to do constructor overloading in Java

Buchiredddypalli Koushik

In object acquainted programming, a constructor is a special system of classes that initializes a newly created object of that type. A constructor is automatically called when an object is made. The constructor name should be the same as the class name.

Types of constructors

There are three main types of constructors:

  • Default
  • No-arg
  • Parameterized

Constructor overloading

Constructor overloading is a concept in which we have more than one constructor with different parameters. Each constructor performs its own task.


public class Cars
{
  String carname;
  int model;
  int mileage;
Cars()
{
  carname="BMW";
  model=2021;
}
Cars(String s,int i)
{
  carname=s;
  model=i;
}
Cars(String r, int y,int t)
{
    carname=r;
    model=y;
    mileage=t;
}

public static void main(String args[])
{
 Cars c1=new Cars(); // calling with deafault constructor
 System.out.println("Default Constructor : ");
 System.out.println("Car Name : " +c1.carname +"  "+"Car Model : " +c1.model);
 System.out.println();
 
 
 Cars c2=new Cars("Suzuki",2019); // calling with parameterized overloaded constructor;
 System.out.println("This is the Overloaded Constructor with two parameters : ");
 System.out.println("Car Name : " +c2.carname+"  "+"Car Model : " +c2.model);
 System.out.println();
 
 Cars c3=new Cars("Suzuki",2020,20); // calling with parameterized overloaded constructor;
 System.out.println("This is the Overloaded Constructor with three parameters : ");
 System.out.println("Car Name : " +c3.carname+"  "+"Car Model : " +c3.model+" "+"Mileage : "+c3.mileage);
 

}
 }
  • In the code above, we implement constructor overloading.

  • The class and constructor are both named Cars because the name of the constructor should be the same as the class name.

  • We have a default constructor, a constructor with two parameters, and a constructor with three parameters.

  • A default constructor has no parameters.

  • A parameterized constructor has parameters to initialize some values.

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Buchiredddypalli Koushik
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