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# 📚 Java Programming Language – Part 4/10: Object-Oriented Programming (OOP) Basics #Java #OOP #Programming #Classes #Objects Welcome to Part 4 of our Java series! Today we'll explore the fundamentals of Object-Oriented Programming in Java. --- ## 🔹 What…
## 🔹 Practical Example: Employee Hierarchy
class Employee {
String name;
double salary;

public Employee(String name, double salary) {
this.name = name;
this.salary = salary;
}

public void work() {
System.out.println(name + " is working...");
}
}

class Manager extends Employee {
String department;

public Manager(String name, double salary, String dept) {
super(name, salary);
this.department = dept;
}

@Override
public void work() {
System.out.println(name + " is managing " + department);
}

public void conductMeeting() {
System.out.println("Conducting department meeting");
}
}

// Usage:
Employee emp1 = new Employee("Ahmed", 5000);
Manager mgr1 = new Manager("Fatima", 8000, "Marketing");

emp1.work(); // "Ahmed is working..."
mgr1.work(); // "Fatima is managing Marketing"
mgr1.conductMeeting();


---

## 🔹 Best Practices for Inheritance
1. Favor Composition Over Inheritance - When possible
2. Keep Inheritance Hierarchies Shallow - Avoid deep inheritance trees
3. Use Abstract Classes for Partial Implementations
4. Document Overridden Methods Properly
5. Follow Liskov Substitution Principle - Subclass should be substitutable for superclass

---

### 📌 What's Next?
In Part 6, we'll cover:
➡️ Interfaces
➡️ Abstract Classes
➡️ Difference Between Interfaces and Abstract Classes

#JavaOOP #Inheritance #Polymorphism 🚀
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