java8-stream-应用demo

package com.niewj.stream;

import lombok.Getter;
import lombok.Setter;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author weijun.nie
 * @Date 2019/12/13 14:28
 * @Version 1.0
 */
public class StreamDemo {

    public static void main(String[] args) {
        doDone();
    }

    private static void doDone() {
        List<Book> books = new ArrayList<>();
        books.add(Book.of("9787500652045", "城南旧事", 198, "中国青年出版社", 16.00f, 9.0f, new Author("林海音", 100)));
        books.add(Book.of("10019-1979", "呐喊", 160, "人民文学出版社", 0.36f, 8.9f, new Author("鲁迅", 1)));
        books.add(Book.of("9787506022583", "十年光阴", 306, "人民文学出版社", 28.00f, 8.5f, new Author("阿南", 10000)));
        books.add(Book.of("9787532740291", "变形记", 457, "上海译文出版社", 28.00f, 8.7f, new Author("卡夫卡", 0)));
        books.add(Book.of("9787500652045", "百年孤独", 360, "南海出版公司", 39.50f, 9.0f, new Author("马尔克斯", 2)));
        books.add(Book.of("9787020036509", "茶馆", 142, "人民文学出版社", 9.80f, 9.0f, new Author("老舍", 3)));
        books.add(Book.of("9787500601593", "红岩", 596, "中国青年出版社", 22.00f, 7.6f, new Author("罗广斌", 80)));
        books.add(Book.of("10019-1985", "朝花夕拾", 92, "人民文学出版社", 0.25f, 8.7f, new Author("鲁迅", 1)));

        // 1. 找出 最 薄/贵/高分 的一本书

        // 2. 获取所有出版社集合

        // 3. 所有书按照评分降序排序， 评分相同的按照价格升序

        // 4. 拿到所有作者集合

        // 5. 所有书按照作者排名降序排列

        // 6. 计算所有书的页数和以及平均页数

        // 7. 按照书名的长度升序排列

        // 8. 按照书名的长度升序排列并得到书名集合

    }
}

@Setter
@Getter
class Book {
    private String isbn;
    private String name;
    private int pages;
    private String press;
    private float price;
    private float score;
    private Author author;

    public static Book of(String isbn, String name, int pages, String press, float price, float score, Author author) {
        Book book = new Book();
        book.isbn = isbn;
        book.name = name;
        book.pages = pages;
        book.press = press;
        book.price = price;
        book.score = score;
        book.author = author;
        return book;
    }

}

@Setter
@Getter
class Author {
    /**
     * 作家笔名
     */
    private String penName;

    /**
     * 作家榜-排名
     */
    private int rank;

    public Author(String penName, int rank) {
        this.penName = penName;
        this.rank = rank;
    }

    @Override
    public String toString() {
        return rank + " --> [" + this.penName + "]";
    }
}