Java — Abstraction

Abstract class

abstract class Animal {
    abstract void sound();
    
    void sleep() {
        System.out.println("Sleeping");
    }
}

Implement abstract

class Dog extends Animal {
    void sound() {
        System.out.println("Bark");
    }
}

Rules

• Cannot instantiate abstract class
• Subclass must implement all abstract methods
• Can have constructors and concrete methods

Mini Practice

1. Create abstract class
2. Add abstract methods
3. Implement in subclass
4. Practice abstraction

Up Next

Continue with Interfaces - Interface types.