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What is the use of parametrized constructor in Java?
A constructor is similar to method and it is invoked at the time creating an object of the class, it is generally used to initialize the instance variables of a class. The constructors have same name as their class and, have no return type.
There are two types of constructors parameterized constructors and no-arg constructors a parameterized constructor accepts parameters.
The main purpose of a constructor is to initialize the instance variables of a class. Using a parameterized constructor, you can initialize the instance variables dynamically with the values specified at the time of instantiation.
public class Sample{
Int i;
public sample(int i){
this.i = i;
}
}Example
In the following example the Student class has two private variables age and, name. From main method we are instantiating the class variables using parameterized constructors −
import java.util.Scanner;
public class StudentData {
private String name;
private int age;
//parameterized constructor
public StudentData(String name, int age){
this.name =name;
this.age = age;
}
public void display(){
System.out.println("Name of the Student: "+this.name );
System.out.println("Age of the Student: "+this.age );
}
public static void main(String args[]) {
//Reading values from user
Scanner sc = new Scanner(System.in);
System.out.println("Enter the name of the student: ");
String name = sc.nextLine();
System.out.println("Enter the age of the student: ");
int age = sc.nextInt();
System.out.println(" ");
//Calling the parameterized constructor
new StudentData(name, age).display();
}
}Output
Enter the name of the student: Sundar Enter the age of the student: 20 Name of the Student: Sundar Age of the Student: 20
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