Java《图书管理系统》练习

书的对象（book）

Book 书

**package book;

/**
 * 定义一本书
 */
public class Book {
   
    private String name;// 书名
    private String author;//书的作者
    private int price;// 书的价格
    private String type;// 书的类型
    private boolean isBorrowed;//判断书是否有被借出去

    /**
     * 这里是没有初始化 isBorrowed
     * 原因：最开始一本书是默认没有被借出的
     * 如果没有初始化，boolean 默认是 flase
     */
    public Book(String name, String author, int price, String type) {
   
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
    }

    public String getName() {
   
        return name;
    }
    public void setName(String name) {
   
        this.name = name;
    }
    public String getAuthor() {
   
        return author;
    }
    public void setAuthor(String author) {
   
        this.author = author;
    }
    public int getPrice() {
   
        return price;
    }
    public void setPrice(int price) {
   
        this.price = price;
    }
    public String getType() {
   
        return type;
    }
    public void setType(String type) {
   
        this.type = type;
    }
    public boolean isBorrowed() {
   
        return isBorrowed;
    }

    public void setBorrowed(boolean borrowed) {
   
        isBorrowed = borrowed;
    }
    
    // 打印
    @Override
    public String toString() {
   
        return "Book{" +
                "书名='" + name + '\'' +
                ", 作者='" + author + '\'' +
                ", 价格=" + price +
                ", 类型='" + type + '\'' +
                ((isBorrowed == true) ? " 以借出":" 未借出") +
                '}';
    }
}
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BookList 书架

package book;
/**
 *  书架
 */

public class BookList {
   
    // 用数组来当做书架，存根所以的书
    private  Book[] books = new Book[10];
    // 存储当前书架里有多少本书
    public int usedSize;

    // 通过构造方法来初始化数组（书架），给数组预存三本的书
    public BookList() {
   
       books[0] = new Book("三国演义","罗贯中",45,"小说");
       books[1] = new Book("西游记","吴承恩",46,"小说");
       books[2] = new Book("斗破苍穹","唐家三少",47,"小说");
       //书的数量
       this.usedSize = 3;
    }

    public int getUsedSize() {
   
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
   
        this.usedSize = usedSize;
    }
    public Book getPos(int pos){
   
        return books[pos];
    }

    // 存储一本书到指定的位置,指的是最后的位置
    public void setBooks(Book book,
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