Initializing a Set with an Iterable

java set iterable
VaidAbhishek picture VaidAbhishek · May 8, 2013 · Viewed 27.7k times · Source

I want to initialize a Set Implementation (HashSet) in Java with an Iterable. However, the constructor of HashSet doesn't accept Iterables, but only Collections type objects.

Is there a way to convert from Iterable to some subtype of Collections.

Answer

ConnorWGarvey picture ConnorWGarvey · May 8, 2013

You can use Guava.

Set<T> set = Sets.newHashSet(iterable);

or to make it read like a sentence static import,

import static com.google.common.collect.Sets.*;

Set<T> set = newHashSet(iterable);

Related questions

Convert Set to List without creating new List

I am using this code to convert a Set to a List: Map<String, List<String>> mainMap = new HashMap<>(); for (int i=0; i < something.size(); i++) { Set<String> set = getSet(...); //returns …

Read More
How to Iterate over a Set/HashSet without an Iterator?

How can I iterate over a Set/HashSet without the following? Iterator iter = set.iterator(); while (iter.hasNext()) { System.out.println(iter.next()); }

Read More
How to convert an Array to a Set in Java

I would like to convert an array to a Set in Java. There are some obvious ways of doing this (i.e. with a loop) but I would like something a bit neater, something like: java.util.Arrays.asList(Object[] …

Read More