Java图书搜索与查询实现方法解析

public class Book {
    private String title;
    private String author;
    private String isbn;
    private int publicationYear;

    public Book(String title, String author, String isbn, int publicationYear) {
        this.title = title;
        this.author = author;
        this.isbn = isbn;
        this.publicationYear = publicationYear;
    }

    // Getter方法
    public String getTitle() { return title; }
    public String getAuthor() { return author; }
    public String getIsbn() { return isbn; }
    public int getPublicationYear() { return publicationYear; }

    @Override
    public String toString() {
        return "《" + title + "》 by " + author + " (ISBN:" + isbn + ", " + publicationYear + ")";
    }
}

import java.util.*;

public class BookSearchSystem {
    private List books;

    public BookSearchSystem() {
        books = new ArrayList();
    }

    // 添加图书
    public void addBook(Book book) {
        books.add(book);
    }

    // 按书名搜索（支持部分匹配）
    public List searchByTitle(String keyword) {
        List result = new ArrayList();
        for (Book book : books) {
            if (book.getTitle().toLowerCase().contains(keyword.toLowerCase())) {
                result.add(book);
            }
        }
        return result;
    }

    // 按作者搜索
    public List searchByAuthor(String keyword) {
        List result = new ArrayList();
        for (Book book : books) {
            if (book.getAuthor().toLowerCase().contains(keyword.toLowerCase())) {
                result.add(book);
            }
        }
        return result;
    }

    // 精确匹配ISBN
    public Book searchByIsbn(String isbn) {
        for (Book book : books) {
            if (book.getIsbn().equals(isbn)) {
                return book;
            }
        }
        return null; // 未找到
    }

    // 通用搜索：在标题或作者中查找关键词
    public List search(String keyword) {
        List result = new ArrayList();
        for (Book book : books) {
            if (book.getTitle().toLowerCase().contains(keyword.toLowerCase()) ||
                book.getAuthor().toLowerCase().contains(keyword.toLowerCase())) {
                result.add(book);
            }
        }
        return result;
    }
}

public class Main {
    public static void main(String[] args) {
        BookSearchSystem system = new BookSearchSystem();

        // 添加图书
        system.addBook(new Book("Java编程思想", "Bruce Eckel", "978-0131872486", 2007));
        system.addBook(new Book("Effective Java", "Joshua Bloch", "978-0134685991", 2018));
        system.addBook(new Book("深入理解Java虚拟机", "周志明", "978-7111421480", 2013));

        // 搜索演示
        System.out.println("=== 按关键词搜索 ===");
        List results = system.search("java");
        for (Book book : results) {
            System.out.println(book);
        }

        System.out.println("\n=== 按作者搜索 ===");
        List byAuthor = system.searchByAuthor("周志明");
        for (Book book : byAuthor) {
            System.out.println(book);
        }

        System.out.println("\n=== 按ISBN精确查找 ===");
        Book exact = system.searchByIsbn("978-0134685991");
        if (exact != null) {
            System.out.println("找到: " + exact);
        } else {
            System.out.println("未找到该ISBN的图书");
        }
    }
}