java book程序

Question

编写一个类Book，该类中包含3个成员变量，分别表示书名、价格和数量，同时提供构造方法（初始化成员变量的值）、getter和setter成员方法（获取或修改成员变量的值）。在测试类里从键盘上取得一个实例book的书名-价格和数量然后输出，并用setter方法修改书名，价格和数量，用getter方法进行输出。

Answer 1

public class Book {
    private String bookName;

    private double price;

    private int num;

    //空参构造器
    public Book() {
    }

   //带参构造器
    public Book(String bookName, double price, int num) {
        this.bookName = bookName;
        this.price = price;
        this.num = num;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }
}

public class BookTest {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入书名：");
        String bookName = scanner.next();
        System.out.println("请输入价格：");
        double price = scanner.nextDouble();
        System.out.println("请输入数量：");
        int num = scanner.nextInt();

        System.out.println("书名为:"+bookName+",价格为:"+price+",数量为:"+num);

        Book book = new Book();
        book.setBookName("伊索寓言");
        book.setPrice(25.6);
        book.setNum(50);

        System.out.println("书名为:"+book.getBookName()+",价格为:"+book.getPrice()+",数量为:"+book.getNum());
    }
}

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