Check If Two String Arrays are Equivalent

给两个数组, 里面是字符串, 问是不是能concatenate后组成相同的字符串.

class Solution {
    public boolean arrayStringsAreEqual(String[] word1, String[] word2) {
        StringBuilder sb1 = new StringBuilder();
        StringBuilder sb2 = new StringBuilder();
        for(String w : word1) {
            sb1.append(w);
        }
        for(String w : word2) {
            sb2.append(w);
        }
        return sb1.compareTo(sb2) == 0;
    }
}