Why use the parameterized constructor in Java?

Java Programming Language > Class, Object and Methods in java > Constructor

Short Question

830

Answer:

The parameterized constructor is used to provide different values to the distinct objects. However, you can provide the same values also.

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.

//Java Program to demonstrate the use of 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();  
   }  
}

111 Karan
222 Aryan

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Related Program List

531. What is Constructor Overloading in Java?

Answer:

In Java, a constructor is just like a method but without return type. It can also be overloaded like Java methods.

Constructor overloading in Java 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 types.

Example of Constructor Overloading

//Java program to overload constructors in java  
class Student5{  
    int id;  
    String name;  
    int age;  
    //creating two arg constructor  
    Student5(int i,String n){  
    id = i;  
    name = n;  
    }  
    //creating three arg constructor  
    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();  
   }  
}

Output

111 Karan 0
222 Aryan 25

# Tutorial: Constructor overloading

Question: Class, Object and Methods in java Short

532. Difference between constructor and method in Java

Answer:

There are many differences between constructors and methods. They are given below.

Java Constructor	Java Method
A constructor is used to initialize the state of an object.	A method is used to expose the behavior of an object.
A constructor must not have a return type.	A method must have a return type.
The constructor is invoked implicitly.	The method is invoked explicitly.
The Java compiler provides a default constructor if you do not have any constructor in a class.	The method is not provided by the compiler in any case.
The constructor name must be same as the class name.	The method name may or may not be same as class name.

# Tutorial: Constructor

Question: Class, Object and Methods in java Short

533. Can constructor perform other tasks instead of initialization?

Answer:

Yes, like object creation, starting a thread, calling a method, etc. You can perform any operation in the constructor as you perform in the method.

# Tutorial: Constructor

Question: Class, Object and Methods in java Short

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