P81 - Java Stream Operations – 2 | distinct, limit, skip, mapToObj, toArray

In this video, we continue our deep dive into Stream operations in Java — this is Part 2 of the Java Stream Operations series! 🚀 We’ll explore some of the most useful intermediate and terminal operations like distinct(), limit(), skip(), mapToObj(), and toArray() — with real-world examples, interview questions, and best practices to help you master Java Streams!

✨ What You'll Learn:

👉 What are Intermediate and Terminal operations in Streams?
👉 ✅ Intermediate Operations:
• distinct() – remove duplicate elements
• limit() – restrict the number of elements in the stream
• skip() – skip a given number of elements
• mapToObj() – convert primitive streams (IntStream, LongStream, DoubleStream) to object streams

👉 ✅ Terminal Operation:
• toArray() – convert a Stream back into an array


⭐⭐ List of Interview Questions on Stream Operations in Java – Part 2 ⭐⭐

❓ What does the distinct() method do in a Stream?
❓ How does distinct() handle duplicates for custom objects?
❓ Is distinct() an intermediate or terminal operation?
❓ How does limit() help in processing large data streams efficiently?
❓ What happens if you use limit() after skip()?
❓ Can we use skip() and limit() together? In what scenarios?
❓ What is the purpose of mapToObj() in Java Streams?
❓ How does mapToObj() differ from map()?
❓ When would you use mapToObj() in real-world applications?
❓ What is the return type of toArray()?
❓ How do you convert a Stream to an array of a specific type?
❓ Is toArray() a terminal operation?
❓ Can you use distinct() with parallel streams safely?
❓ What happens if we call skip() with a value greater than the stream size?
❓ What are short-circuiting operations in Java Streams?
❓ Which of the methods (distinct, limit, skip) are short-circuiting?
❓ How do these operations improve performance in stream pipelines?
❓ Can we chain distinct(), limit(), and skip() together?
❓ How does the order of these operations affect results?
❓ How does mapToObj() help in working with primitive data streams?

By the end of this video, you’ll have a clear understanding of how these stream operations work, when to use them, and how to combine them efficiently in your stream pipelines to write cleaner and more optimized Java code. 💪

👉 This is part of a Java Stream Operations series, so stay tuned for upcoming videos on collect(), reduce(), flatMap(), anyMatch(), allMatch(), and noneMatch()!

💬 Questions to Think About:

❓ What is the difference between map() and mapToObj()?
❓ Can skip() and limit() be used together effectively?
❓ How does distinct() work for objects that don’t override equals() and hashCode()?

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