Java/com/study/demo3/LibraryTest.java

package com.study.demo3;

import java.util.List;

public class LibraryTest {
  public static void main(String[] args) {
    Library lib = new Library();

    EBook e1 = new EBook("E001", "Java Basics", 5.2);

    e1.setAvailable(false);

    PrintedBook p1 = new PrintedBook("P001", "Design Patterns", 3);

    lib.addBook(e1);
    lib.addBook(p1);

    lib.addBook(p1);

    System.out.println("\n--- 可借阅图书列表 (available = true) ---");
    List<Book> availableList = lib.searchAvailableBooks();

    if (availableList.isEmpty()) {
      System.out.println("No books are currently available for loan.");
    } else {
      for (Book book : availableList) {

        System.out.println("- " + book.getTitle() + " (ISBN: " + book.getIsbn() + ")");
      }
    }

    e1.returnBook();
    System.out.println("\n--- 恢复 e1 后可借阅图书列表 ---");
    availableList = lib.searchAvailableBooks();
    for (Book book : availableList) {
      System.out.println("- " + book.getTitle() + " (ISBN: " + book.getIsbn() + ")");
    }
  }
}