1) What is Constructor?
A constructor is a special method in Java used to initialize objects. It is automatically called when an object of a class is created.
Name: A constructor must have the same name as the class.
No Return Type: A constructor does not have a return type, not even void.
2) Types of Constructor
Default Constructor:
A default constructor is a constructor with no parameters.
The Java compiler makes a default constructor if we do not write any constructor in our program.
Example:
public class Student{
String name;
int age;
// Default Constructor
public Student(){
System.out.println("Default constructor");
}
public static void main(String[] args){
Student student1 = new Student();
student1.name = "Sasireka";
student1.age = 23;
System.out.println(student1.name);
System.out.println(student1.age);
}
}
Output:
Parameterized Constructor:
A parameterized constructor is used to assign values to object variables when the object is created.
Example:
public class Student {
String name;
int age;
//Parameterized constructor
public Student(String Name, int Age){
name = Name;
age = Age;
}
public static void main(String args[]) {
Student student1 = new Student("Sasireka", 23);
System.out.println(student1.name);
System.out.println(student1.age);
}
}
Output:
3) Constructor Overloading
Constructor overloading - A class have more than one constructor with different no of parameters or with different type of parameter.
Example:
public class Student {
String name;
int age;
//constructor overloading
public Student(String Name, int Age){
name = Name;
age = Age;
}
public Student(){
System.out.println("Constructor");
}
public static void main(String args[]) {
Student student1 = new Student("Sasireka", 23);
System.out.println(student1.name);
System.out.println(student1.age);
Student myStudent1 = new Student();
}
}
Output:
United States
NORTH AMERICA
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