Design Patterns
Design patterns are proven solutions to common software design problems. Learn patterns that senior developers use daily to write flexible, maintainable, and testable code.
Design patterns are reusable solutions to recurring problems in software design. They're like blueprints you can customize to solve particular design problems in your code.
No. Focus on commonly used patterns first: Singleton, Factory, Builder, Strategy, and Observer. Understanding a few patterns deeply is better than knowing many superficially.
Yes. While modern Java features like lambdas reduce boilerplate, the underlying patterns remain valuable. Strategy pattern works beautifully with lambdas, for example.
Use Singleton sparingly—typically for configuration managers, logging, or resource pools. Overuse creates global state that makes testing difficult. Our article covers Singleton pitfalls.
Interviewers often ask "How would you design X?" Design patterns give you a vocabulary to discuss solutions and demonstrate your software design knowledge.
Yes, if misapplied. Don't force patterns where simple solutions work. Use patterns when they genuinely solve a problem and make your code clearer, not just to show you know them.