public static void main(String args[]){
        int arr[] = {-1,-2,-3,-4,-5,1,2,3,4,5};
        PositiveAndNegativeNumberAlternatively pan = new PositiveAndNegativeNumberAlternatively();
        pan.arrange(arr);
        for(int i=0; i < arr.length; i++){
            System.out.print(arr[i]+ " ");
        }
    }
http://www.geeksforgeeks.org/rearrange-positive-and-negative-numbers-publish/
src/com/interview/array/PositiveAndNegativeNumberAlternatively.java