👉 Object-Oriented Programming (OOP) in C# vs Java – Simple Comparison

“OOP is the same idea, different keywords.” 🧠💻

In this article, we compare how Java ☕ and C# 🔷 handle Object-Oriented Programming. OOP helps you write organized, reusable, and maintainable code.

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🏗️ Class & Object

Java ☕

• Class: blueprint for objects
• Object: instance of a class

class Person {
    String name;
}
Person p = new Person();
p.name = "Alice";

C# 🔷

• Class: blueprint for objects
• Object: instance of a class

class Person {
    public string Name { get; set; }
}
Person p = new Person();
p.Name = "Alice";

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🔒 Encapsulation (Properties)

Java ☕

• Private fields + public getters/setters

class Person {
    private String name;
    public String getName() { return name; }
    public void setName(String n) { name = n; }
}

C# 🔷

• Properties simplify getters/setters

class Person {
    public string Name { get; set; } // encapsulated property
}

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🧬 Inheritance

Java ☕

• Use extends keyword

class Employee extends Person {}

C# 🔷

• Use colon : for inheritance

class Employee : Person {}

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🔄 Polymorphism (virtual, override)

Java ☕

• Methods are virtual by default
• Override using @Override

class Person {
    void Speak() { System.out.println("Hello"); }
}
class Employee extends Person {
    @Override
    void Speak() { System.out.println("Hi, I am Employee"); }
}

C# 🔷

• Use virtual in base class
• Use override in derived class

class Person {
    public virtual void Speak() { Console.WriteLine("Hello"); }
}
class Employee : Person {
    public override void Speak() { Console.WriteLine("Hi, I am Employee"); }
}

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🧩 Abstraction (Abstract Class & Interface)

Java ☕

• Abstract class: abstract keyword
• Interface: interface keyword

C# 🔷

• Abstract class: abstract keyword
• Interface: interface keyword
• Interfaces can have default implementations (from C# 8.0)

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🆚 Java Interface vs C# Interface

• Java interfaces: methods are abstract by default
• C# interfaces: methods are abstract by default, can include default implementation
• Both allow multiple inheritance of behavior

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🎯 Key Takeaway

• OOP concepts (Class, Object, Encapsulation, Inheritance, Polymorphism, Abstraction) are similar in Java and C#
• Keywords differ: extends vs :, @Override vs override
• C# properties make encapsulation easier
  
  
  

  

  Compare Java and C# OOP concepts including classes, objects, encapsulation, inheritance, polymorphism, and interfaces in a simple developer-friendly infographic.