将比较器与多个比较器一起使用

Question

我可以使用此代码中的所有简单比较器进行排序，但不能使用ComplexComparator. 我无法弄清楚如何编码才能使其正常工作。任何建议/解释将不胜感激。

这是我的主要程序：

package pkgTest;

import java.util.Arrays;

public class Main {

    public static void main(String[] args) {

        Student[] students = new Student[6];

        students[0] = new Student("Pete", 1989, 3.6);

        students[1] = new Student("Tomas", 1989, 3.9);

        students[2] = new Student("Helen", 1990, 3.6);

        students[3] = new Student("Steve", 1991, 3.7);

        students[4] = new Student("Natalie", 1993, 3.7);

        students[5] = new Student("John", 1992, 4.0);

        NameComparator byName

                = new NameComparator();

        BirthDateComparator byBirthDate

                = new BirthDateComparator();

        AverageComparator byAverage

                = new AverageComparator();

        ComplexComparator complexSorting

                = new ComplexComparator(byName,

                        byAverage);

        System.out.println("===============");

        System.out.println("Before sorting:");

        System.out.println("===============");

        for (Student student : students) {

            System.out.println(student.getName()

                    + " // " + student.getBirthDate()

                    + " // " + student.getAverage());

        }

        Arrays.sort(students, complexSorting);

        System.out.println("==============");

        System.out.println("After sorting:");

        System.out.println("==============");

        for (Student student : students) {

            System.out.println(student.getName()

                    + " // " + student.getBirthDate()

                    + " // " + student.getAverage());

        }

    }

}