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javasetany

Good way to get *any* value from a Java Set?

Given a simple Set<T>, what is a good way (fast, few lines of code) to get any value from the Set?

With a List, it's easy:

List<T> things = ...;
return things.get(0);

But, with a Set, there is no .get(...) method because Sets are not ordered.

Solution

  • A Set<T> is an Iterable<T>, so iterating to the first element works:

    Set<T> things = ...;
return things.iterator().next();

    Guava has a method to do this, though the above snippet is likely better.