JShell Examples: Collections Static Factory Methods
JShell Examples: Collections Static Factory Methods
Explore Java 9's JShell and how you can use it to create static factory methods for collections, particularly with Lists, Sets, and Maps.
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This post continues my exploration of Java 9 features from my My Top Java 9 Features blog post. Here, we are experimenting with Java 9 Collections Static Factory Methods in the List, Set, and Map interfaces.
Collections Static Factory Methods
Java 9 makes it easier to create immutable lists using its new static Factory Methods.
List and Set
There are 12 Set.of and List.of methods:
- List.of() or Set.of()
- List.of(E e1) or Set.of(E e1) to E e10
- List.of(E… elements) or Set.of(E… elements)
Examples
jshell> Set.of()
$1 ==> []
| created scratch variable $1 : Set<Object>How do you break a Monolith into Microservices at Scale? This ebook shows strategies and techniques for building scalable and resilient microservices.
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