Groovy String Join Function: Concatenating Strings in Groovy

The provided code snippet combines elements of Java and Groovy. Here's the corrected Groovy code for joining strings in an array:

class Solution {
    String join(String[] s) {
        String t = ''
        s.each { t += it }
        return t
    }
}

In Groovy, there's no need to import java.util.* as it is automatically included. Also, access modifiers like public are optional for classes in Groovy.

This Groovy code defines a function join that accepts an array of strings (s). It initializes an empty string t and then uses the each iterator to iterate through the elements of the array. For each element (it), the function appends it to the string t. Finally, the function returns the concatenated string t.