swap halves

import java.util.Arrays;

public class SwapHalves
{
    public static void main(String[] args)
    {
        int[] elements = { 1, 4, 9, 7, 3, 2, 5, 11, 0, 9 };

        int j = elements.length / 2;
        for(int i = 0;  i < (elements.length / 2); i++)
        {
            int saved = elements[i];
            elements[i] = elements[j];
            elements[j] = saved;
            j++;
        }
        System.out.println(Arrays.toString(elements));
    }
}

two dimension array

double reg1 = prices[0][1];
for (int i = 0; i < prices.length; i++)
{
	for (j = 0; j < prices[0].length; j++)
	{
		System.out.printf("%10.3f", prices[i][j]);
	}
	System.out.println();
}