Checks Whether a Given String is a Palindrome or not

class Palindrome 
{
public static void main(String[] args) 
  { 
  String a= new String();
  a=args[0];
  char b[]=a.toCharArray();
  int i;
  for(i=0;i<=b.length/2;i++)
    if(b[i]!=b[b.length-i-1])
         break;
      if(i==b.length/2+1)
               System.out.println(a +"is a palindrome");
      else
        System.out.println(a+"is not a palindrome");
 }
}