配列の順序を乱す

/**
 *           ，      ，    。
 * @author wWX154783
 */
public class Test_wzs9
{
    private Random random = new Random();
    //     
    private static final int SIZE = 10;
    //        
    private int[] positions = new int[SIZE];

    public Test_wzs9()
    {
        for (int index = 0; index < SIZE; index++)
        {
            //      ，       
            positions[index] = index;
        }
        //          
        dwn();
    }

    //    
    public void changePosition()
    {
        for (int index = 0; index < 10; index++)
        {
            //  0 index         ， index      
            exchange(index, random.nextInt(index + 1));
        }
        dwn();
    }

    //     
    private void exchange(int p1, int p2)
    {
        int temp = positions[p1];
        positions[p1] = positions[p2];
        positions[p2] = temp;
    }

    //       
    private void dwn()
    {
        for (int index = 0; index < SIZE; index++)
        {
            System.out.print(positions[index] + " ");
        }
        System.out.println();
    }

    public static void main(String[] args)
    {
        Test_wzs9 rs = new Test_wzs9();
        rs.changePosition();
        rs.changePosition();
        rs.changePosition();
    }
}