[1.8] isSubstring

1. Example

s1= "waterbottle"
s2 = "erbottlewat"


s1s1= "waterbottlewaterbottle"
s2 =         "erbottlewat"

2. Implementation

public static boolean isRotation(String s1, String s2)
{



     int len = s1.length();
     // check that s1 and s2 are equal length and not empty
     if ( len == s2.length() &&  len > 0 )
     {
         /* concatenate s1 and s1 within new buffer */
         String s1s1 = s1 + s1;
         return isSubstring(s1s1,s2);
     }



     return false;



}

3. Similar Ones