rotate array

[sahar.97]

I want to rotate k top element of array for example:
k = 2
array before rotate --> 3 , 4 , 2
array after rotate ---> 3 , 2 , 4

 int[] temp = new int[k];

            for (int i = 0; i < k; i++) {
                if(this.stack[i]!= null){
                temp[i] = this.pop();
                }    else
                    i--;
            }
            for (int i = 0 ; i <k ; i++) {
                this.push(temp[i]);
            }

i want to implement it by stack
can any one help me to optimize it ?

[Ewald Horn]

Is there any particular reason you are not using the Java Stack collection? See Java Stac for some help.

I don't see the value in building your own stack collection, unless it's a homework exercise, in which case you need to struggle with it :)

[stultuske]

also, what is the logic of your rotation? why doesn't the first element switch places?

[stultuske]

also, what is the logic of your 'rotate'? how come the first element of the array doesn't switch places?