Converting from HashSet<String> to String[]

问题

What's the best way to convert HashSet<String> to String[]?

回答1:

set.toArray(new String[set.size()]);

回答2:

Answer of JB Nizet is correct, but in case you did this to transform to a CSV like string, with Java 8 you can now do:

Set<String> mySet = new HashSet<>(Arrays.asList("a", "b", "c"));
System.out.println(String.join(", ", mySet));

Output is: a, b, c

This allows to bypass arrays.

来源：https://stackoverflow.com/questions/5474656/converting-from-hashsetstring-to-string