Java获取两个字符串中最大相同子串的方法

class stringtest3

{

     public static string getmaxsubstring(string s1,string s2)

     {

         string max = "" ,min = "" ;

         max = (s1.length()>s2.length())?s1: s2;

         min = (max==s1)?s2: s1;    

//      sop("max="+max+"...min="+min);

         for ( int x= 0 ; x<min.length(); x++)

         {

             for ( int y= 0 ,z=min.length()-x; z!=min.length()+ 1 ; y++,z++)

             {

                 string temp = min.substring(y,z);              

                 sop(temp);

                 if (max.contains(temp)) //if(s1.indexof(temp)!=-1)

                     return temp;

             }

         }

         return "" ;

     }

     public static void main(string[] args)

     {

         string s1 = "ab" ;

         string s2 = "cvhellobnm" ;

         sop(getmaxsubstring(s2,s1));

     }

     public static void sop(string str)

     {

         system.out.println(str);

     }

}