打印从大到小和从小到大的数字列表

Question

如何输出列表中的值，从小到大或从大到小排序？

private static final ArrayList<Double> nbAll = new ArrayList<>();

public static void test() {
    try (Scanner scanner = new Scanner(System.in)) {

        System.out.print("Please enter the number of notes you want to calculate : ");
        double nb = scanner.nextInt();

        for (int i = 0; i < nb; i++) {
            double temp = scanner.nextDouble();
            nbAll.add(temp);
        }

        double temp = nbAll.stream().mapToInt(Double::intValue).sum();

        double result = temp / nb;

        System.out.println("Result : " + result);
        retry();
    }
}

Answer 1

流式传输列表的元素，对它们进行排序，然后打印它们：

nbAll.stream().sorted().forEach(System.out::println);

反向排序：

nbAll.stream().sorted(Comparator.reverseOrder()).forEach(System.out::println);

Answer 2

您可以拨打Collections.sort

Collections.sort(nbAll); // ascending order
nbAll.forEach(System.out::println);

然后按降序打印，不用求助，从末尾开始倒序打印即可。

for (int i = nbAll.size()-1; i >= 0; i--) {
   System.out.println(nbAll.get(i));
}

打印从大到小和从小到大的数字列表

Print a list of numbers from largest to smallest and smallest to largest

java

sorting

java.util.scanner