public class SortTestUtil {

    //构造方法私有化，工具类无需产生任何实例
    private SortTestUtil() { }

    // 生成有n个元素的随机数组,每个元素的随机范围为[rangeL, rangeR]
    public static Integer[] generateRandomArray(int number, int rangeL, int rangeR) {
        assert rangeL <= rangeR;

        Integer[] arr = new Integer[number];

        for (int i = 0; i < number; i++) {
            arr[i] = new Integer((int) (Math.random() * (rangeR-rangeL+1) + rangeL));
        }
        return arr;
    }

    // 打印arr数组的所有内容
    public static void printArray(Object arr[]) {

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

        return;
    }
}