prblm14.java

public class prblm14 {
    public static void main(String[] args) {
        String[] strs = {"flower","flow","flight"};
        System.out.println(new prblm14().longestCommonPrefix(strs));

        String[] strs2 = {"dog","racecar","car"};
        System.out.println(new prblm14().longestCommonPrefix(strs2));
    }

    public String longestCommonPrefix(String[] strs) {
        if (strs.length == 0) return "";
        for (int i = 0; i < strs[0].length(); i++) {
            for (int j = 1; j < strs.length; j++) {
                if (strs[j].length() <= i || strs[j].charAt(i) != strs[0].charAt(i)) {
                    return strs[0].substring(0, i);
                }
            }
        }
        return strs[0];
    }
}