Java > Warmup-1 >frontBack (CodingBat Solution)

Problem:

Given a string, return a new string where the first and last chars have been exchanged.

frontBack("code") → "eodc"
frontBack("a") → "a"
frontBack("ab") → "ba"

Solution:

public String frontBack(String str) {
   if (str.length() == 1 || str.length() == 0 )
        return str;
        else
return str = (str.substring(str.length()-1,str.length()) + 
   str.substring(1,str.length()-1) + str.substring(0,1));
}