Simple Factory Pattern in Java: Explanation & Practice

Problem summary

Create a ShapeFactory that creates different shapes based on input type.

Starter code

// Shape interface with draw()
// ShapeFactory with createShape(String type)
// Returns Circle, Square, or Triangle

public class Main {
    public static void main(String[] args) {
        // Use factory to create and draw shapes
    }
}

Expected output and test cases

• Create circle

  Drawing circle

• Create square

  Drawing square

• Invalid type

  Unknown shape

Hints

1. Factory method returns interface type
2. Switch/if on input string
3. Return appropriate implementation

Related Inheritance exercises

• Practice Comparable Implementation in Java
• Practice Template Method Pattern in Java
• Practice Simple Decorator in Java

Practice all Inheritance exercises · Run this idea in the Java compiler