Longest Common Prefix

public class Solution {
    public String longestCommonPrefix(String[] strs) {
        int len = strs.length;
        if(len<=0) return "";
        if(len==1) return strs[0];
        String pre = strs[0];
        for(int i=1;i<len;i++){
            String cur = strs[i];
            int p=0;
            while(p<pre.length() && p<cur.length()){
                if(cur.charAt(p)==pre.charAt(p))
                    p++;
                else break;
            }
            pre = pre.substring(0,p);
        }
        return pre;
    }
}