题目：Write a function to find the longest common prefix string amongst an array of strings.
public class Solution {
public String longestCommonPrefix(String[] strs) {
if(strs.length<=0)
return "";
for(int i=0;i<strs[0].length();i++)
{
char x = strs[0].charAt(i);
for(int j=1;j<strs.length;j++)
if(i==strs[j].length()||strs[j].charAt(i) != x)
{
System.out.println(strs[0].substring(0,i));
return strs[0].substring(0,i);
}
}
return strs[0];
}
}
