Java-如何从字符串列表创建哈希ID

Question

I have a list of String. I want to generate one single hash code from all the strings of the list. How can I do that?

Answer 1

If you have a List of objects, you can do

List<String> list = ...
int hashCode = list.hashCode();

The hashCode uses the contents. There are lots of options for improving the hash code if you need but this is the simplest.

Answer 2

尝试这个：

int hashCode = Objects.hash(list.toArray());

Answer 3

You could just take the hashCode of the list, but that may be dodgy if you intend to have different implementations of List hold the same strings. A more robust solution, that relies only on the strings themselves could be to use Arrays#hashCode :

int hash = Arrays.hashCode(list.toArray());

Note, however, that this hash code depends on the order of the elements of the array, so if you don't care about the order of the strings in the list, you may want to sort this array so that the same strings produce the same hash code.