Longest Common Prefix

public class Solution {
    public String longestCommonPrefix(String[] strs) {
        if(strs == null || strs.length == 0) return "";
        String comm = strs[0];
        for(int i = 1; i < strs.length; i++)
        {
            comm = getCommon(comm,strs[i]);
        }
        return comm;
    }
    public String getCommon(String left, String right)
    {
        int i = 0;
        while(i < left.length() && i < right.length())
        {
            if(left.charAt(i) == right.charAt(i)) i++;
            else    break;
        }
        return left.substring(0,i);
    }
}