要求：给一个数组(集合也可以)，进行排序，从小到大（从大到小也可以，数组倒序排列即可）设置权重,数字相同的权重相同

eg:

{10,10,8,8,6,10,4,13}

排序：{4,6,8,8,10,10,10,13}

权重：{1,2,3,3,5,5,5,8}

代码：

        @Test
	public void sortTest() {

		int[] str = { 1, 4, 6, 7, 1, 3, 7, 2, 3, 5, 8, 10 };
		Arrays.sort(str);

		int orderNum = 0;
		ArrayList<String> list = new ArrayList<String>();

		for (int i = 0; i < str.length; i++) {
			orderNum = i + 1;
			for (int j = 0; j < i; j++) {
				if (str[i] == str[i - j - 1]) {
					orderNum--;
				}
			}
			list.add("str:" + str[i] + " - orderNum:" + orderNum);
		}

		// for (String string : list) {
		// System.out.println(string);
		// }

		// 用String.join就不用使用for循环
		System.out.print(String.join("\n", list));
	}

结果：

str:1 - orderNum:1
str:1 - orderNum:1
str:2 - orderNum:3
str:3 - orderNum:4
str:3 - orderNum:4
str:4 - orderNum:6
str:5 - orderNum:7
str:6 - orderNum:8
str:7 - orderNum:9
str:7 - orderNum:9
str:8 - orderNum:11
str:10 - orderNum:12