定义一个Person类。属性有: 定义一个Book类; 属性有: 书名、 价格。 要求用Comparable接口实现, 使用TreeSet<Person>集合存储, 排序规则: A.先按照收入从高到低排序; B.收入相等的情况下, 按照年龄从小到大排序; C.如果收入和年龄都相等, 按照姓名排序, 字典顺序(String类的compareTo方法); D.如果以上3个属性都相等, 按照书排序, 先按照书价格从低到高, 如果书价格相等, 按照书名(字典顺序)利用自定义比较器Comparator实现类

Person类的定义如下：

import java.util.TreeSet;

public class Person implements Comparable<Person>{
    private String name;
    private int age;
    private double income;
    private Book book;

    public Person(String name, int age, double income, Book book) {
        this.name = name;
        this.age = age;
        this.income = income;
        this.book = book;
    }

    @Override
    public int compareTo(Person o) {
        if (this.income != o.income) {
            return Double.compare(o.income, this.income);
        } else if (this.age != o.age) {
            return Integer.compare(this.age, o.age);
        } else if (!this.name.equals(o.name)) {
            return this.name.compareTo(o.name);
        } else {
            return this.book.compareTo(o.book);
        }
    }

    public static void main(String[] args) {
        TreeSet<Person> set = new TreeSet<>();
        set.add(new Person("Tom", 20, 1000.0, new Book("Java", 20)));
        set.add(new Person("Jerry", 30, 1000.0, new Book("Python", 10)));
        set.add(new Person("Alice", 20, 2000.0, new Book("C++", 20)));
        set.add(new Person("Bob", 30, 1000.0, new Book("JavaScript", 20)));
        for (Person p : set) {
            System.out.println(p.name + " " + p.age + " " + p.income + " " + p.book.name + " " + p.book.price);
        }
    }
}

Book类的定义如下：

public class Book implements Comparable<Book> {
    private String name;
    private int price;

    public Book(String name, int price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public int compareTo(Book o) {
        if (this.price != o.price) {
            return Integer.compare(this.price, o.price);
        } else {
            return this.name.compareTo(o.name);
        }
    }
}

在Person类中实现了Comparable接口，重写了compareTo方法，按照题目要求进行排序。Book类也实现了Comparable接口，重写了compareTo方法，用于在Person类中按照书的价格和书名进行排序。

在main方法中，创建了一个TreeSet集合，并向其中添加了4个Person对象。按照题目要求进行了排序，并打印输出了结果。