Constructor
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constructor
• TYPES OF JAVA CONSTRUCTORS • There are two types of constructors: 1. Default constructor (no-arguments constructor) 2. Parameterized constructor
• DEFAULT CONSTRUCTOR • A constructor that have no parameter is known as default constructor. • Syntax of default constructor: •() • { • }
EXAMPLE class Bike{ Bike() { System.out.println("Bike is created"); } public static void main(String args[]) { Bike b=new Bike(); } }
• PARAMETERIZED CONSTRUCTOR • A constructor which has a specific number of parameters is called a parameterized constructor. • Syntax : •( , ) • { • //data members; • }
EXAMPLE class Student{ int id; String name; Student(int i,String n) { id = i; name = n; } void display() { System.out.println(id+" "+name); } public static void main(String args[]){ Student s1 = new Student(111,"Karan"); Student s2 = new Student(222,"Aryan"); s1.display(); s2.display(); } }
• CONSTRUCTOR OVERLOADING IN JAVA • Constructor overloading 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 Signatures
class Student5{ int id; String name; int age; Student5(int i,String n){ id = i; name = n; } Student5(int i,String n,int a){ id = i; name = n; age=a; } void display() { System.out.println(id+" "+name+" "+age); }
public static void main(String args[]){ Student5 s1 = new Student5(111,"Karan"); Student5 s2 = new Student5(222,"Aryan",25); s1.display(); s2.display(); } }
• TYPES OF JAVA CONSTRUCTORS • There are two types of constructors: 1. Default constructor (no-arguments constructor) 2. Parameterized constructor
• DEFAULT CONSTRUCTOR • A constructor that have no parameter is known as default constructor. • Syntax of default constructor: •
EXAMPLE class Bike{ Bike() { System.out.println("Bike is created"); } public static void main(String args[]) { Bike b=new Bike(); } }
• PARAMETERIZED CONSTRUCTOR • A constructor which has a specific number of parameters is called a parameterized constructor. • Syntax : •
EXAMPLE class Student{ int id; String name; Student(int i,String n) { id = i; name = n; } void display() { System.out.println(id+" "+name); } public static void main(String args[]){ Student s1 = new Student(111,"Karan"); Student s2 = new Student(222,"Aryan"); s1.display(); s2.display(); } }
• CONSTRUCTOR OVERLOADING IN JAVA • Constructor overloading 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 Signatures
class Student5{ int id; String name; int age; Student5(int i,String n){ id = i; name = n; } Student5(int i,String n,int a){ id = i; name = n; age=a; } void display() { System.out.println(id+" "+name+" "+age); }
public static void main(String args[]){ Student5 s1 = new Student5(111,"Karan"); Student5 s2 = new Student5(222,"Aryan",25); s1.display(); s2.display(); } }
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