Constructor oopj

Jun 22, 2021Download as PPTX, PDF0 likes91 views

Constructor is a special method in Java that is used to initialize an object. There are two types of constructors: default (no-arg) constructors that have no parameters, and parameterized constructors that allow passing parameters to set object attribute values. Constructors can be overloaded to support different initialization scenarios. They are invoked during object creation to construct and provide initial values for the object's attributes.

CONSTRUCTOR
S.G.V.P.Gunasekara - 2015238
1

Constructor
Constructor in java is a special type of method that is used to initialize the
object.
Java constructor is invoked at the time of object creation. It constructsthe
values i.e. provides data for the object that is why it is known as
constructor.
2

Rules for creating java constructor
There are basically two rules defined for the constructor.
1. Constructor name must be same as its classname
2. Constructor must have no explicit returntype
3

Types of java constructors
There are two types of constructors:
1. Default constructor (no-arg constructor)
2. Parameterizedconstructor
4

$Default constructor class. It will be invoked at the A constructor that have no parameter is known as defaultconstructor. Syntax of default constructor: <class_name>(){} Example of default constructor In this example, we are creating the no-arg constructor in theBike time of object creation. class Bike1{ Bike1(){ System.out.println("Bike is created") ;} public static void main(Stringargs[]){ Bike1 b=new Bike1(); } } 5$

Parameterized constructor
A constructor that have parameters is known as parameterizedconstructor.
Why use parameterized constructor?
Parameterized constructor is used to provide different values to
the distinct objects.
6

 Example of parameterized constructor
In this example, we have created the constructor of Student class that have two parameters.
We can have any number of parameters in the constructor.
class Student4{
int id;
String name;
Student4(int i,String n){
id = i;
name = n;
}
void display(){System.out.println(id+" "+name);}
public static void main(String args[]){
Student4 s1 = new Student4(111,"Karan");
Student4 s2 = new Student4(222,"Aryan");
s1.display();
s2.display();
}
}
7

Constructor overloading
Like other methods in java constructor can be overloaded i.e. we can
create asmany constructors in our class asdesired. Number of
constructors depends on the information about attributes of an objectwe
have while creating objects.
9

example: constructor overloading example:
classLanguage{
String name;
Language() {
System.out.println("Constructor methodcalled.");
}
Language(String t) {
name = t;
}
public static void main(String[] args) {
Language cpp = new Language();
Language java = new Language("Java");
cpp.setName("C++");
java.getName();
cpp.getName();
}
void setName(String t) {
name = t;
}
void getName() {
System.out.println("Language name: " + name);
}
}
10

Output:
Constructor method called.
Language name: java
Language name:c++
11

This document discusses constructor overloading in Java. It defines constructors as special methods that initialize objects. There are two types of constructors: default (no-argument) constructors and parameterized constructors. Constructor overloading allows a class to have multiple constructors that differ in their parameter lists. This allows constructors to perform different initialization tasks depending on the arguments passed. The document provides examples of default, parameterized, and overloaded constructors.

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Constructor oopj

1. CONSTRUCTOR S.G.V.P.Gunasekara - 2015238 1

2. Constructor Constructor in java is a special type of method that is used to initialize the object. Java constructor is invoked at the time of object creation. It constructsthe values i.e. provides data for the object that is why it is known as constructor. 2

3. Rules for creating java constructor There are basically two rules defined for the constructor. 1. Constructor name must be same as its classname 2. Constructor must have no explicit returntype 3

4. Types of java constructors There are two types of constructors: 1. Default constructor (no-arg constructor) 2. Parameterizedconstructor 4

5. Default constructor class. It will be invoked at the A constructor that have no parameter is known as defaultconstructor. Syntax of default constructor: <class_name>(){} Example of default constructor In this example, we are creating the no-arg constructor in theBike time of object creation. class Bike1{ Bike1(){ System.out.println("Bike is created") ;} public static void main(Stringargs[]){ Bike1 b=new Bike1(); } } 5

6. Parameterized constructor A constructor that have parameters is known as parameterizedconstructor. Why use parameterized constructor? Parameterized constructor is used to provide different values to the distinct objects. 6

7.  Example of parameterized constructor In this example, we have created the constructor of Student class that have two parameters. We can have any number of parameters in the constructor. class Student4{ int id; String name; Student4(int i,String n){ id = i; name = n; } void display(){System.out.println(id+" "+name);} public static void main(String args[]){ Student4 s1 = new Student4(111,"Karan"); Student4 s2 = new Student4(222,"Aryan"); s1.display(); s2.display(); } } 7

8. Output: 111 Karan 222 Aryan 8

9. Constructor overloading Like other methods in java constructor can be overloaded i.e. we can create asmany constructors in our class asdesired. Number of constructors depends on the information about attributes of an objectwe have while creating objects. 9

10. example: constructor overloading example: classLanguage{ String name; Language() { System.out.println("Constructor methodcalled."); } Language(String t) { name = t; } public static void main(String[] args) { Language cpp = new Language(); Language java = new Language("Java"); cpp.setName("C++"); java.getName(); cpp.getName(); } void setName(String t) { name = t; } void getName() { System.out.println("Language name: " + name); } } 10

11. Output: Constructor method called. Language name: java Language name:c++ 11

12. 12

Constructor oopj

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