要保存图书信息，可以创建一个Book类，该类包含以下属性：
- ID：图书的唯一标识符
- Title：图书的标题
- Author：图书的作者
- Year：图书的出版年份

然后，可以使用一个ArrayList来存储图书对象。在程序中，可以通过以下方式保存图书信息：

1. 创建Book类：

public class Book {  
    private int ID;  
    private String title;  
    private String author;  
    private int year;  
    public Book(int ID, String title, String author, int year) {  
        this.ID = ID;  
        this.title = title;  
        this.author = author;  
        this.year = year;  
    }  
    // Getters and setters  
    public int getID() {  
        return ID;  
    }  
    public void setID(int ID) {  
        this.ID = ID;  
    }  
    public String getTitle() {  
        return title;  
    }  
    public void setTitle(String title) {  
        this.title = title;  
    }  
    public String getAuthor() {  
        return author;  
    }  
    public void setAuthor(String author) {  
        this.author = author;  
    }  
    public int getYear() {  
        return year;  
    }  
    public void setYear(int year) {  
        this.year = year;  
    }  
}  

2. 创建一个类来保存图书信息的 ArrayList：

import java.util.ArrayList;  
public class BookManager {  
    private ArrayList<Book> bookList;  
    public BookManager() {  
        bookList = new ArrayList<>();  
    }  
    public void addBook(Book book) {  
        bookList.add(book);  
    }  
    public boolean removeBook(int ID) {  
        for (int i = 0; i < bookList.size(); i++) {  
            if (bookList.get(i).getID() == ID) {  
                bookList.remove(i);  
                return true;  
            }  
        }  
        return false;  
    }  
    public Book findBook(int ID) {  
        for (Book book : bookList) {  
            if (book.getID() == ID) {  
                return book;  
            }  
        }  
        return null;  
    }  
    public ArrayList<Book> getAllBooks() {  
        return bookList;  
    }  
}  

3. 在主程序中使用BookManager类来保存图书信息：

public class Main {  
    public static void main(String[] args) {  
        BookManager bookManager = new BookManager();  
        // 添加图书  
        Book book1 = new Book(1, "Java编程思想", "Bruce Eckel", 2006);  
        Book book2 = new Book(2, "Effective Java", "Joshua Bloch", 2018);  
        bookManager.addBook(book1);  
        bookManager.addBook(book2);  
        // 删除图书  
        bookManager.removeBook(2);  
        // 查找图书  
        Book foundBook = bookManager.findBook(1);  
        if (foundBook != null) {  
            System.out.println("找到图书：" + foundBook.getTitle());  
        } else {  
            System.out.println("未找到图书");  
        }  
        // 获取所有图书  
        ArrayList<Book> allBooks = bookManager.getAllBooks();  
        for (Book book : allBooks) {  
            System.out.println("图书信息：" + book.getTitle());  
        }  
    }  
}  

上述代码演示了如何使用Book和BookManager类来保存、查找和删除图书信息。你可以根据需要对代码进行修改和扩展。