Given 2 strings return a new string made of the first char of a and the last char of b.

java convert char to string .charAt(). Java logic programming question with answer.

-Given 2 strings, a and b, return a new string made of the first char of a and the last char of b, so "yo" and "java" yields "ya". If either string is length 0, use '@' for its missing char.

lastChars("last", "chars") → "ls"
lastChars("yo", "java") → "ya"
lastChars("hi", "") → "h@"

 Solution :
 
     public String lastChars(String a, String b) {
 
             String n;
             int l2= a.length();
             int l3= b.length();
             char co,ct;
   
              if (l2 == 0)
                   co ='@';
              else
                  co = a.charAt(0);



             if(l3==0)
                 ct='@';
             else
                 ct = b.charAt(l3-1);
   
            String p1= Character.toString(co);
           String p2= Character.toString(ct);
           n=p1+p2;
 
           return n;  
         }

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