[代码片段]排序相关

       

public void scoreRank() {
		Double[] scoreArr = new Double[9];
		scoreArr[2] = scoreArr[4] = 66.5;
		scoreArr[0] = scoreArr[5] = 67d;
		scoreArr[1] = scoreArr[3] = scoreArr[6] = 66.4;
		scoreArr[7] = 68d;
		scoreArr[8] = 66.2;
		List<Double> doubleList = Arrays.asList(scoreArr);
		List<Integer> rankList = new ArrayList<Integer>();
		Collections.sort(doubleList, new Comparator<Double>() {
			public int compare(Double arg0, Double arg1) {
				return arg1.compareTo(arg0);// 降序排列
			}
		});
		for (Double double2 : doubleList) {
			System.out.print(double2 + "\t");
		}
		System.out.println();
		// 计算rank
		int rank = 0;
		// 前一个分数，初始化为一个很大的值
		double lastScore = Integer.MAX_VALUE;
		int nOrder = 1; // 并列名次的个数
		for (Double double2 : doubleList) {
			if (lastScore != double2) {
				// 当前分数和前一个分数不相等时求出名次：（上一个名次加上并列名次），否则认为是并列名次
				rank = rank + nOrder;
				lastScore = double2;
				nOrder = 1;
			} else {
				nOrder = nOrder + 1;
			}
			rankList.add(rank);
		}
		for (Integer rank2 : rankList) {
			System.out.print(rank2 + "\t");
		}
		System.out.println();
	}

   结果为:

   

68.0	67.0	67.0	66.5	66.5	66.4	66.4	66.4	66.2	
1	2	2	4	4	6	6	6	9