![4
M A T R I X02
01
A constructor that
have no parameter
is known as default
constructor.
Syntax of default
constructor:
<class_name>(){}
Default Constructor class Bike1
{
//creating a default constructor
Bike1()
{
System.out.println("Bike is created");
}
//main method
public static void main(String args[])
{
//calling a default constructor
Bike1 b=new Bike1();
}
}
Exampl
e :
Output : Bike is created](https://image.slidesharecdn.com/javaconstructors-190410154708/85/Java-Constructors-6-320.jpg)
![5
M A T R I X02
01
A constructor that
have parameters is
known as
parameterized
constructor.
Parameterized
constructor is used
to provide different
values to the
distinct objects
Parameterized
constructor
class Student4{
int id;
String name;
//creating a parameterized constructor
Student4(int i,String n){
id = i;
name = n;
}
//method to display the values
void display(){System.out.println(id+" "+name);}
public static void main(String args[]){
//creating objects and passing values
Student4 s1 = new Student4(111,"Karan");
Student4 s2 = new Student4(222,"Aryan");
//calling method to display the values of object
s1.display();
s2.display();
}
}
Exampl
e :
Output : 111 Karan
222 Aryan](https://image.slidesharecdn.com/javaconstructors-190410154708/85/Java-Constructors-7-320.jpg)
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- 2. CONTENTS 1 Java Constructor Rules for Java Constructor Types of Java Constructor 2 3 Difference between constructors and methods4
- 3. 1 Java Constructor A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created. It can be used to set initial values for object attributes
- 4. 2 Rules for Java Constructor The constructor name must match the name of the class The default constructor is ALWAYS a no-arg constructor Constructors can use any access modifier, including private Constructors must not have a return type.
- 5. 3 Types of Java Constructor M A T R I X 01 02 No-Argument Constructor Parameterized constructor
- 6. 4 M A T R I X02 01 A constructor that have no parameter is known as default constructor. Syntax of default constructor: <class_name>(){} Default Constructor class Bike1 { //creating a default constructor Bike1() { System.out.println("Bike is created"); } //main method public static void main(String args[]) { //calling a default constructor Bike1 b=new Bike1(); } } Exampl e : Output : Bike is created
- 7. 5 M A T R I X02 01 A constructor that have parameters is known as parameterized constructor. Parameterized constructor is used to provide different values to the distinct objects Parameterized constructor class Student4{ int id; String name; //creating a parameterized constructor Student4(int i,String n){ id = i; name = n; } //method to display the values void display(){System.out.println(id+" "+name);} public static void main(String args[]){ //creating objects and passing values Student4 s1 = new Student4(111,"Karan"); Student4 s2 = new Student4(222,"Aryan"); //calling method to display the values of object s1.display(); s2.display(); } } Exampl e : Output : 111 Karan 222 Aryan
- 8. 6 Difference Between Constructor and Method M A T R I X Constructor are used to initialize the state of object Constructor must not have return type Constructor compil er provide default constructor . Method is expose the behaviour of object. Method must have return type. Method compiler does't provide. 1 2 3 1 2 3