Move all negative numbers to beginning and positive to end (java),order is not important

public class posbeginnegend {



    private static void Swap(int a, int b) {
        int temp=a;
        a=b;
        b=temp;
    }
    

    public static void main(String[] args) {
        int []arr={45,23,-89,-21,67,-34,7,-44};

        int start=0;
        int end=arr.length-1;

        while(start<=end)
        {
            int mid=start+(end-start)/2;

            if(arr[mid]>0)
            {   if(arr[end]>0)
                {
                    
                    end--;
                }
                else
                {
                    Swap(arr[mid],arr[end]);
                    end--;
                }
            }
            else
            {
                if(arr[start]<0)
                {   
                    start++;


                }
                else
                {
                    Swap(arr[mid],arr[start]);
                    start++;
                }
            }


    }
    for(int i=0;i<=arr.length-1;i++)
    {System.out.print(arr[i]+ " ");}

}

    
}

no error in code,still not getting updated array
where is the mistake?

i tried using three pointers rather than two pointers aooroach,the logic is correct but getting the same array.
geggrsesggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg

>Solution :

Swap() (should be swap() by convention) is changing internal values. java is pass-by-value. instead of passing the values, you need to pass the array itself and the indices to swap

private static void Swap(int[] arr, int i1, int i2) {
    int temp = arr[i1];
    arr[i1] = arr[i2];
    arr[i2] = temp;
}