VoidSwap.java

package Lesson3.KeyPoint2;

import java.util.Arrays;

/**
 * Created by Юрий on 18.12.2015.
 */
public class VoidSwap {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 4, 5, 6, 7};
        int[] arr1 = new int [0];

        System.out.println(Arrays.toString(arr));
        swap(arr);
        System.out.println(Arrays.toString(arr));
        swap(arr1);
        System.out.println(Arrays.toString(arr1));

    }

    static void swap(int[] data) {

        if (data == null || data.length == 0) {
            System.out.println(-1);
            return;
        }

        int temp;
        for (int i = 0, k = 1; (i < data.length - 1 && k <= data.length - 1); i++, k++) {
            temp = data[i];
            data[i] = data[k];
            data[k] = temp;
        }
    }
}