Issue
Given a set Set<String> s = Set.of("a", "b", "c")
, how do I create a new immutable set with the contents of s
and some additional data? I tried Set t = Set.of(s, "d")
, but this gives me mixed types t ==> [[a, b, c], d]
. I need [a, b, c, d]
. I am not using Guava.
thanks!
Solution
Try this.
Set<String> s = Set.of("a", "b", "c");
Set<String> t = Stream.of(s, Set.of("d"))
.flatMap(Set::stream)
.collect(Collectors.toUnmodifiableSet());
System.out.println(t);
output
[d, c, b, a]
or
Set<String> t = Stream.of(s.stream(), Stream.of("d"))
.flatMap(Function.identity())
.collect(Collectors.toUnmodifiableSet());
Answered By - 英語は苦手
Answer Checked By - Pedro (JavaFixing Volunteer)