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public class Solution {

public String longestCommonPrefix(String[] strs) {

if(strs == null || strs.length == 0) return "";

int length = Integer.MAX_VALUE;

for(String str: strs){

length = Math.min(length, str.length());

}

StringBuffer sb = new StringBuffer();

for(int i = 0; i < length; i++){

char prev = strs[0].charAt(i);

for(int j = 1; j < strs.length; j++){

char current = strs[j].charAt(i);

if(current!=prev) return sb.toString();

}

sb.append(prev);

}

return sb.toString();

}

}