按照集合中的对象的属性进行排序

这里已书的价格从小到大排序为例（使用到的技术点：冒泡）

package com.ljh;

import lombok.AllArgsConstructor;
import lombok.Data;

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

/**
 * @author ljh
 * @date 2021/4/20 11:11
 */
public class ListTest {
    public static void main(String[] args) {
        List<Book> list = new ArrayList<>();
        list.add(new Book("三国演义", 17.0));
        list.add(new Book("三国演义", 18.9));
        list.add(new Book("三国演义", 13.9));
        list.add(new Book("三国演义", 188.9));
        List<Book> sort = sort(list);
        for (Book book : sort) {
            System.out.println("book = " + book);
        }
    }


    public static List<Book> sort(List<Book> list) {
        int size = list.size();
        boolean flag = false;
        // 技术点：使用冒泡排序
        for (int i = 0; i < size - 1; i++) {
            for (int j = 0; j < size - 1 - i; j++) {
                Book book1 = list.get(j);
                Book book2 = list.get(j + 1);
                if (book1.getPrice() > book2.getPrice()) {
                    flag = true;
                    list.set(j, book2);
                    list.set(j + 1, book1);
                }
            }
            // 对冒泡进行优化
            if (!flag) {
                break;
            } else {
                flag = false;
            }
        }
        return list;
    }
}

@Data
@AllArgsConstructor
class Book {
    private String name;
    private Double price;
}

结果