Question 1

How do I migrate from Java Collections to Eclipse Collections?

Accepted Answer

Use adapter classes like ListAdapter.adapt() or factory methods such as Lists.mutable.withAll() for seamless conversion. The library is designed for JCF compatibility, making incremental adoption straightforward.

Question 2

Eclipse Collections vs Java Streams: which is better for performance?

Accepted Answer

Eclipse Collections often outperforms Java Streams due to memory-efficient data structures and optimized eager APIs, but benchmarks vary by use case. For parallel processing, Eclipse Collections' ParallelIterable can be more efficient than Stream's parallel streams.

Question 3

Does Eclipse Collections work with Spring Boot?

Accepted Answer

Yes, it integrates well with Spring Boot and other frameworks since it's compatible with JCF types. For serialization, you may need configuration, like using Jackson modules mentioned in the README for JSON handling.

Question 4

How to use primitive collections in Eclipse Collections?

Accepted Answer

Use factory methods like IntLists.mutable.of() or specialized types for primitives, which avoid boxing overhead. The library provides full support for lists, sets, maps, and more for all primitive types.

Question 5

Is Eclipse Collections thread-safe?

Accepted Answer

Mutable collections are not thread-safe by default, similar to JCF, but immutable variants are safe for concurrent reads. For thread safety, use synchronization or concurrent wrappers provided in the utilities.

Question 6

What are the memory benefits of UnifiedMap?

Accepted Answer

UnifiedMap reduces memory usage by optimizing entry storage and avoiding overhead from standard HashMap, as detailed in the linked blog posts. This is particularly beneficial for large maps in memory-sensitive applications.

Eclipse Collections

What is Eclipse Collections?

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Pros & Cons

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Frequently Asked Questions