Java Interfaces with ISP: Building Maintainable Code with TDD — PickAClass
⏱ 2h 54m 📚 29 lessons 🎧 Audio version

Java Interfaces with ISP: Building Maintainable Code with TDD

Learn to design focused interfaces in Java using the Interface Segregation Principle and Test-Driven Development for cleaner, more robust applications.

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About this course

Are you struggling with large, unwieldy interfaces that force implementations to depend on methods they don't use? This course will teach you how to apply the Interface Segregation Principle (ISP) to craft highly maintainable and flexible Java code. By the end of this course, you will be able to confidently design and refactor Java interfaces, guided by the principles of ISP and Test-Driven Development (TDD), resulting in more modular and testable software. What you'll learn: * Understand the Interface Segregation Principle (ISP) and its role within SOLID principles. * Apply Test-Driven Development (TDD) practices to guide interface design in Java. * Design granular, focused interfaces that promote code reusability and maintainability. * Utilize modern Java interface features like default and static methods to enhance flexibility. * Refactor existing Java codebases to align with ISP guidelines for improved modularity. * Practice writing effective unit tests for interface implementations using a testing framework. This course begins with foundational concepts of SOLID principles and ISP, then progressively introduces the practical application of TDD to drive interface design, followed by refactoring techniques and modern Java interface features. This course is designed for beginner Java developers who want to write cleaner, more maintainable code. No prior experience with TDD or SOLID principles is required. Start building better Java interfaces today.

Course contents

What you'll get

  • 📜 Certificate of completion
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  • 📱 Phone or computer
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  • ⚡ Short & focused
    2h 54m of practical content

Certificate of completion

Every course you complete on PickAClass issues a credential like this — original, with its own code, verifiable by URL, and detailed about what was actually demonstrated.

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Java Interfaces with ISP: Building Maintainable Code with TDD
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1.2 hrs
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1.4 hrs
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Performance detail
Coursework summary
Lessons completed 14 / 14
Practice questions 26 / 28
Assignments submitted 4 (avg 4.5 / 5)
Capstone project Reviewed — 4.6 / 5
Total practice 6.2 hrs
Performance benchmark
Cohort rank Top 12% of 1,625
Time to completion 11 days (median: 22)
Mastery score 91 / 100
Practice-question score 94%
Skill verification Verified Skill Path
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pickaclass.com/certificates/PCC-2026-X4F7-AP19
Issued under the academic standards of PickAClass. Skill levels reflect assessed performance against the course's competency rubric. This is an original credential of this platform.

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Yes — full refund within 14 days, no questions asked.

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Yes. On completion you'll receive a certificate you can add to your LinkedIn profile.

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