leetcode Longest Common Prefix 多个字符串的最长字串

 1 public class Solution {
 2     public String get(String a,String b)
 3     {
 4         
 5         if(a==""||b=="") return "";
 6         int len1=a.length();
 7         int len2=b.length();
 8         int len=len1;
 9         if(len>=len2) len=len2;
10         String s="";
11         for(int i=0;i<len;i++)
12         {
13             if(a.charAt(i)==b.charAt(i))
14             {
15                 s+=a.charAt(i);
16             }
17             else break;
18             
19         }
20         return s;
21     }
22         
23     
24     public String longestCommonPrefix(String[] strs) {
25         int len=strs.length;
26         if(len==0) return "";
27         if(len==1) return strs[0];
28         String ans=get(strs[0],strs[1]);
29         if(ans=="") return "";
30         else
31         {
32             for(String s:strs)
33             {
34                 ans=get(s,ans);
35                 if(ans=="") return "";
36             }
37                 
38             
39             
40         
41             
42         }
43         return ans;
44         
45         
46         
47         
48     }
49 }
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