Default constructor in java | Code2night.com
Code2night
  • Home
  • Blogs
  • Guest Posts
  • Tutorial
  • Post Blog
  • Register
  • Login
  1. Home
  2. Blogpost

Default constructor in java

Date- Sep 07,2023

2109

In Java, a default constructor is a constructor that is automatically provided by the Java compiler if no other constructors are explicitly defined in a class. The default constructor has no arguments and is responsible for initializing the object's fields with default values.

Here are the characteristics of a default constructor:

  1. 1. No Arguments: A default constructor takes no arguments.

  2. 2. No Explicit Implementation: If you don't define any constructors in your class, Java will automatically generate a default constructor for you.

  3. 3. Initialization: The default constructor initializes instance variables to their default values based on their data types (e.g., 0 for numeric types, null for reference types, and false for boolean).

Here's an example of a class with a default constructor:

In this example, the class MyClass has two instance variables, number and text, and it also has a default constructor. When you create an object of this class without providing any constructor arguments, the default constructor is automatically invoked, and the fields are initialized with their default values.


package Tutorial_01;

public class MyClass {

	 int number;
	    String text;
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub

	    // Instance variables
	   
	    MyClass obj = new MyClass(); // Calls the default constructor
	    System.out.println(obj.number); // Outputs 0
		System.out.println(obj.text); // Outputs null
	    
	   
	}

}

It's important to note that once you define any constructor in a class (parameterized or no-arg constructor), the default constructor provided by Java is not automatically generated. Therefore, if you want to retain a no-arg constructor, you should explicitly define it yourself, like in the example above.

Comments

Tags

LinkedinLogin
LinkedinProfile
GetLinkedinProfile
C#
Aspnet
MVC
Linkedin
ITextSharp
Export to Pdf
AspNet Core
AspNet
View to Pdf in Aspnet
Model Validation In ASPNET Core MVC 60
Model Validation
Model Validation In ASPNET Core MVC
Model Validation In ASPNET
Image Compression in AspNet
Compress Image in c#
AspNet MVC
Free Download for Youtube Subscribers!

First click on Subscribe Now and then subscribe the channel and come back here.
Then Click on "Verify and Download" button for download link

Subscribe Now | 1210
Download
Support Us....!

Please Subscribe to support us

Thank you for Downloading....!

Please Subscribe to support us

Continue with Downloading
Be a Member
Join Us On Whatsapp Join Us On Facebook

Welcome To Code2night, A common place for sharing your programming knowledge,Blogs and Videos

  • Panipat
  • info@Code2night.com

Links

  • Home
  • Blogs
  • Tutorial
  • Post Blog

Popular Tags

Copyright © 2025 by Code2night. All Rights Reserved

  • Home
  • Blog
  • Login
  • SignUp
  • Contact
  • Terms & Conditions
  • Refund Policy
  • About Us
  • Privacy Policy
  • Json Beautifier
  • Guest Posts