J260713/授课代码/c260722/src/homework/p09_bookmanager/BookManager.java

package homework.p09_bookmanager;


/**
 * @author WanJl
 * @version 1.0
 * @title BookManager
 * @description 管理类
 * @create 2026/7/22
 */
public class BookManager {
    /**
     * 创建并返回一个包含 5 本图书 的数组（使用全参构造初始化）
     * @return
     */
    public Book[] initBooks(){
        //创建5个图书对象
        Book b1=new Book(1001,"Java从入门到精通",79.0);
        Book b2=new Book(1002,"数据结构与算法",65.0);
        Book b3=new Book(1003,"设计模式之禅",58.0);
        Book b4=new Book(1004,"深入理解JVM",89.0);
        Book b5=new Book(1005,"计算机网络",45.0);
        //创建一个长度为5的图书数组---静态初始化
        Book[] books={b1,b2,b3,b4,b5};
        //返回数组
        return books;
    }

    /**
     * 遍历输出所有图书信息
     * @param books
     */
    public void printBooks(Book[] books){
        for(Book b:books){
            System.out.println("编号："+b.getId()+"，书名："+b.getTitle()+"，价格："+b.getPrice());
        }
    }

    /**
     * 按价格从高到低排序（冒泡排序）
     * @param books
     */
    public void sortByPrice(Book[] books){
        //外层循环
        for (int i = 0; i < books.length-1; i++) {
            //内层循环
            for (int j = 0; j < books.length-1-i; j++) {
                //注意：不是直接笔记book对象，而是笔记book的价格属性
                if (books[j].getPrice()<books[j+1].getPrice()){
                    Book tempBook=books[j];
                    books[j]=books[j+1];
                    books[j+1]=tempBook;
                }
            }
        }
    }

    /**
     * 根据书名查找图书，返回找到的图书对象（找不到返回 null）
     * @param books
     * @param title
     * @return
     */
    public Book searchByTitle(Book[] books, String title){
        for (Book b:books){
            if (b.getTitle()==title){
                return b;
            }
        }
        return null;
    }

}