java构造函数中的点

这是 类型的可变参数构造函数Comparator<T>。

在您的班级中，该字段this.comparators可能有一个类型Comparator<T>[]——即一个比较器数组。

例如，您可以通过以下方式调用此类构造函数：

CustomizedComparator();

CustomizedComparator(comparator);

CustomizedComparator(intCompataror, longComparator, stringComparator);

等等。

这本质上是将数组传递给方法/构造函数的语法糖。

JDK 5中添加了新功能，可以更轻松地创建采用可变数量参数的方法。此功能称为varargs.

术语的缩写variable-length arguments- 可变长度参数。

采用可变数量参数的方法称为可变元数方法，或简称为方法varargs。

例如

感谢您的澄清和答复。我在实践中尝试过，很方便。

public class Solution {
    public static void main(String[] args) {
        ArrayList<Woman> women = new ArrayList<Woman>();
        women.add(new Woman("Катя", "Катина", 18));
        women.add(new Woman("Маша", "Машина", 21));
        women.add(new Woman("Катя", "Сакина", 5));

        Comparator<Woman> compareByName = new Comparator<Woman>() {
            public int compare(Woman o1, Woman o2) {
                return o1.name.compareTo(o2.name);
            }
        };

        Comparator<Woman> compareByHeight = new Comparator<Woman>() {
            public int compare(Woman o1, Woman o2) {
                return o1.age - o2.age;
            }
        };

        Comparator<Woman> compareBySurname = new Comparator<Woman>() {
            public int compare(Woman o1, Woman o2) {
                return o1.surname.compareTo(o2.surname);
            }
        };

        //Collections.sort(women, compareByHeight);

        CustomizedComparator<Woman> customizedComparator = new CustomizedComparator<Woman>(compareByName, compareByHeight);
        Collections.sort(women, customizedComparator);
        for (Woman w : women) {
            System.out.println(w.name + " " + w.surname + " " + w.age);
        }
    }

    public static class CustomizedComparator<T> implements Comparator<T> {
        private Comparator<T>[] comparators;

        public CustomizedComparator(Comparator<T>... comparators) {
            this.comparators = comparators;
        }

        @Override
        public int compare(T o1, T o2) {
            int result = 0;
            for (int i = 0; i < comparators.length; i++) {
                result = comparators[i].compare(o1, o2);
                if (result != 0) {
                    break;
                }
            }
            return result;
        }
    }

    public static class Woman {
        public String name;
        public String surname;
        public int age;

        public Woman(String name, String surname, int age) {
            this.age = age;
            this.name = name;
            this.surname = surname;
        }
    }
}