Find out longest common prefix

Longest_Common_Prefix.java

package wcy.leetcode.gist;

/**
 * Created by ChauyanWang on 12/20/14.
 */
public class Longest_Common_Prefix {

    int findMinLength(String[] strs) {
        int minLength = Integer.MAX_VALUE;
        for(String str : strs) {
            if(str.length() < minLength) minLength = str.length();
        }
        return minLength;
    }

    public String Solution (String[] strs) {
        StringBuffer result = new StringBuffer();
        if(strs == null || strs.length == 0) return result.toString();
        final int minLength = findMinLength(strs);
        for(int i = 0; i < minLength; i++) {
            for(int j = 1 ; j < strs.length; j++)
                if(strs[j].charAt(i) != strs[0].charAt(i)) return result.toString();
            result.append(strs[0].charAt(i));
        }
        return result.toString();
    }
}