Constructors in Java: Default vs Parameterized Explained

Veröffentlicht am: 07 Dezember 2025
auf dem Kanal: Nagasrinivasarao

🚀 Stop writing messy Java code! Learn how to initialize objects properly using Constructors.

In this video, we continue our Object-Oriented Programming (OOPs) journey by fixing a major problem we created in the last video. Manually setting values for every object (like p1.name = "Phone";) is slow, repetitive, and bad practice.

Today, you will learn how to use Constructors to create and set up your objects in a single line of code. Whether you are building an e-commerce app or a game, mastering constructors is essential for every Java developer.

📝 IN THIS VIDEO, YOU WILL LEARN:

What is a Constructor in Java and why is it special?

The difference between a Default Constructor and a Parameterized Constructor.

How to use the this keyword to avoid variable naming conflicts.

How to make your object creation 3x faster and cleaner.

Real-world coding example using a Product class.

⏳ TIMESTAMPS 0:00 - The Problem: Why manual assignment is bad 1:15 - What is a Constructor? (Definition & Rules) 2:30 - Default Constructors Explained (No-Args) 3:45 - Parameterized Constructors (The Pro Way) 5:10 - Understanding the this keyword 6:20 - Live Coding: Refactoring our Product Class 7:45 - Summary & What’s Next (Encapsulation)
class Product {
String name;
double price;

// Parameterized Constructor
Product(String name, double price) {
this.name = name;
this.price = price;
}

void display() {
System.out.println(name + " : $" + price);
}
}

public class Main {
public static void main(String[] args) {
// Creating objects in one line!
Product p1 = new Product("MacBook Pro", 1299.00);
Product p2 = new Product("Mechanical Keyboard", 85.50);

p1.display();
p2.display();
}
}
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#Java #JavaProgramming #Constructors #OOPs #LearnCoding #JavaCodeAcademy #SoftwareDevelopment #CodingTutorial

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