Constructor Overloading in Java

Constructor overloading in Java is a technique of having more than one constructor with different parameter lists.

They are arranged in a way that each constructor performs a different task. They are differentiated by the compiler by the number of parameters in the list and their types.

Example:

class Student{  

    int id;  

    String name;  

    int  age;

//creating a two argument constructor  

    Student(int i,String n){  

    id = i;  

    name = n;  

    }  

//creating a three argument constructor  

    Student(int i,String n,int a){  

    id = i;  

    name = n;  

    age=a;  

    }  

    //method to display the values  

    void display(){        

System.out.println(id+" "+name+" "+age);  

}  

    public static void main(String args[]){  

    //creating objects and passing values  

    Student s1 = new Student(111,"Kalyan");  

    Student s2 = new Student(222,"Ashraf",25);  

    //calling method to display the values of object  

    s1.display();  

    s2.display();  

   }  

}

In above example, there are two constructors with different number of parameters. Corresponding constructor is called depending on parameters using to initialize the object.