Web Reference: Jan 9, 2024 · A quick and practical guide to creating collections and maps using Java 9 factory methods. Jul 23, 2025 · It allows you to create a list, set, and map of values in just one line. Java 9 doesn't bring as many dramatic changes to our way of coding as its predecessor did, but surely we will have some fancy features. All general-purpose Collection implementation classes (which typically implement Collection indirectly through one of its subinterfaces) should provide two "standard" constructors: a void (no arguments) constructor, which creates an empty collection, and a constructor with a single argument of type Collection, which creates a new collection ...
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