// modern java, taught in depth — not memorized
Learn Java the way you'll actually use it.
In-depth courses from core fundamentals to the real-world stack — Apache Kafka, Maven, the Streams API and distributed systems — built by a developer who wanted Java explained properly.
14
Expert courses
All levels
Beginner → advanced
Hands-on
Practical lessons
Free
Start today, no signup
// why java handbook
Depth over shallow tutorials
I'm Gopi — a developer who wanted a Java resource that actually goes deep. Every course is broken into clear, structured lessons with enough depth to use in real projects and interviews, not just to pass a quiz.
Structured paths
From fundamentals to advanced systems, laid out as a route you can follow.
Concept + practice
Each lesson pairs the idea with real, runnable code you write yourself.
Interview-ready
Data structures and patterns framed the way they actually get asked.
Always growing
New lessons and courses added regularly, from Kafka to Flink.
// the learning path
A route from first line to production
Not sure where to start? Follow the path — each stage builds on the last.
01 · core
Fundamentals
Syntax, OOP, collections, the JVM.
02 · dsa
Data structures
Arrays, maps, trees — and the problems.
03 · modern
Functional & Streams
Lambdas, the Streams API, Maven.
04 · scale
Systems
Kafka, Flink, distributed design.
// featured courses
Start where you are
Hand-picked courses to begin with — pick a level and go deep.
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2024/06/Master-Arrays.png" width="2000" height="1250" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Master Arrays: From Zero To Hero</span></h4>
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<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
</div>
<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Master arrays from zero to hero. Arrays are the most fundamental data structure in computer science and the building blocks for many complex data structures.</span></p></div>
<a href="https://www.javahandbook.com/java-arrays-mastery/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Go To Course</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2024/06/Java-programmingg.png" width="2000" height="1250" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Java Programming: Beginner To PRO</span></h4>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Master Java programming and get hired. This course is a collection of the entire Java library.</span></p></div>
<a href="https://www.javahandbook.com/learn-java/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Start Here</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2024/06/Bit-Manipulation-course.png" width="1000" height="420" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Grokking Bit Manipulation For Coding Interviews</span></h4>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">This course teaches bit manipulation, a powerful technique to enhance algorithmic and problem-solving skills.</span></p></div>
<a href="https://www.javahandbook.com/bitmask/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Start Here</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2026/01/Apache-Maven-Central-repository-binaries-downloaded-to-local-repository.svg" width="1885" height="1086" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Apache Maven For Java Developers</span></h4>
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<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Master Apache Maven step-by-step! Complete Java build automation course covering POM.xml, dependencies, plugins, multi-module projects & CI/CD integration. Perfect for beginners to professionals. Start building better Java projects today!</span></p></div>
<a href="https://www.javahandbook.com/maven-course/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Start Learning</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2026/02/Java-Strings-Mastery.png" width="1640" height="1000" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Java Strings Mastery</span></h4>
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<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
</div>
<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Learn Java String fundamentals, advanced methods, memory management, StringBuilder optimization, pattern matching, and real-world string handling techniques."</span></p></div>
<a href="https://www.javahandbook.com/java-strings/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Go To Course</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2026/01/Apache-Kafka-Course.svg" width="1220" height="825" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Event-Driven Systems with Apache Kafka</span></h4>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Modern systems no longer move data in batches. They react — instantly. Every click, order, payment, log, and notification is an </span><b><strong style="white-space: pre-wrap;">event</strong></b><span style="white-space: pre-wrap;">, and at scale, events need a backbone.</span><br><span style="white-space: pre-wrap;">That backbone is </span><b><strong style="white-space: pre-wrap;">Apache Kafka</strong></b><span style="white-space: pre-wrap;">.</span></p></div>
</div>
</div>
// full catalog
All courses
Browse the full catalog and find your next topic.
<div class="kg-card kg-product-card">
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2024/06/Master-Arrays.png" width="2000" height="1250" class="kg-product-card-image" loading="lazy">
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Master Arrays: From Zero To Hero</span></h4>
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<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
<span class="kg-product-card-rating-active kg-product-card-rating-star"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12.729,1.2l3.346,6.629,6.44.638a.805.805,0,0,1,.5,1.374l-5.3,5.253,1.965,7.138a.813.813,0,0,1-1.151.935L12,19.934,5.48,23.163a.813.813,0,0,1-1.151-.935L6.294,15.09.99,9.837a.805.805,0,0,1,.5-1.374l6.44-.638L11.271,1.2A.819.819,0,0,1,12.729,1.2Z"></path></svg></span>
</div>
<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Master arrays from zero to hero. Arrays are the most fundamental data structure in computer science and the building blocks for many complex data structures. </span></p></div>
<a href="https://www.javahandbook.com/java-arrays-mastery/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Go To Course</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2024/06/Java-programmingg.png" width="2000" height="1250" class="kg-product-card-image" loading="lazy">
<div class="kg-product-card-title-container">
<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Java Programming: Beginner To PRO</span></h4>
</div>
<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Master Java programming and get hired. This course is a collection of the entire Java library.</span></p></div>
<a href="https://www.javahandbook.com/learn-java/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Start Here</span></a>
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<img src="https://storage.ghost.io/c/00/01/0001b1c8-8c52-4cdb-b3c7-c0746bea790e/content/images/2024/06/Bit-Manipulation-course.png" width="1000" height="420" class="kg-product-card-image" loading="lazy">
<div class="kg-product-card-title-container">
<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Grokking Bit Manipulation For Coding Interviews</span></h4>
</div>
<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">This course teaches bit manipulation, a powerful technique to enhance algorithmic and problem-solving skills.</span></p></div>
<a href="https://www.javahandbook.com/bitmask/" class="kg-product-card-button kg-product-card-btn-accent" target="_blank" rel="noopener noreferrer"><span>Start Here</span></a>
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Apache Maven For Java Developers</span></h4>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Master Apache Maven step-by-step! Complete Java build automation course covering POM.xml, dependencies, plugins, multi-module projects & CI/CD integration. Perfect for beginners to professionals. Start building better Java projects today!</span></p></div>
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Java Strings Mastery</span></h4>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Learn Java String fundamentals, advanced methods, memory management, StringBuilder optimization, pattern matching, and real-world string handling techniques."</span></p></div>
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Event-Driven Systems with Apache Kafka</span></h4>
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<div class="kg-product-card-description"><p><span style="white-space: pre-wrap;">Modern systems no longer move data in batches. They react — instantly. Every click, order, payment, log, and notification is an </span><b><strong style="white-space: pre-wrap;">event</strong></b><span style="white-space: pre-wrap;">, and at scale, events need a backbone.</span><br><span style="white-space: pre-wrap;">That backbone is </span><b><strong style="white-space: pre-wrap;">Apache Kafka</strong></b><span style="white-space: pre-wrap;">.</span></p></div>
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<h4 class="kg-product-card-title"><span style="white-space: pre-wrap;">Java Streams API</span></h4>
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<div class="kg-product-card-description"><p dir="ltr"><span style="white-space: pre-wrap;">One of the powerful features the Java team included when bundling JDK 1.8 is the Streams API.</span></p></div>
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