README.md

📝 Template Method

Category: Behavioral

📖 Description

The Template Method pattern defines the skeleton of an algorithm, deferring some steps to subclasses.

🛠️ Purpose: Allow subclasses to redefine specific steps of an algorithm.

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🔧 Structure

classDiagram
    class AbstractClass {
        +templateMethod()
        +primitiveOperation1()
        +primitiveOperation2()
    }
    class ConcreteClass

    AbstractClass <|-- ConcreteClass

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💻 Java 21 Example

Abstract Class

public abstract class AbstractClass {

    public final void templateMethod() {
        primitiveOperation1();
        primitiveOperation2();
    }

    protected abstract void primitiveOperation1();
    protected abstract void primitiveOperation2();
}

Concrete Class

public final class ConcreteClass extends AbstractClass {
    @Override
    protected void primitiveOperation1() {
        System.out.println("Primitive Operation 1");
    }

    @Override
    protected void primitiveOperation2() {
        System.out.println("Primitive Operation 2");
    }
}

Usage

public final class Demo {
    public static void main(final String[] args) {
        AbstractClass obj = new ConcreteClass();
        obj.templateMethod();
    }
}