You can do something like:
public static void shiftRight( char [] letters )
{
char last = letters[letters.length-1]; // save off first element
// shift right
for( int index =letters.length-2; index >= 0 ; index-- )
letters[index+1] = letters [index];
// wrap last element into first slot
letters[0] = last;
System.out.print("\nshifted Array: " + Arrays.toString(letters) );
}
I only modified your: letters.length-1 into letters.length-2 and printed the array.
Another, easier approach is to use, System.arraycopy like:
last = letters[letters.length-1];
System.arraycopy(letters, 0, letters, 1, letters.length-1 );
letters[0] = last;
To print the array you can also use:
System.out.print("{");
for (int i=0;i<letters.length-1;i++)
System.out.print("'"+letters[i]+",");
System.out.println("'"+letters[letters.length-1]+"'}");