(简答题) 编程练习： 应用对象序列化和对象反序列化向文件写入对象，并将对象读取出来输入到控制台上。 效果图: 任务要求： 1、创建Product类，并声明它的属性：id，name,categories,price 2、实现Serializable接口； 3、定义Product类构造方法； 4、在Test类里面，创建Product类的对象：iphone,ipad,macbook,iwatch 5、实例化对象输入流和对象输出流； 6、写入Product类的四个对象； 7、从文件里读取四

个对象并输出到控制台上。

代码如下：

Product类：

import java.io.Serializable;

public class Product implements Serializable {
    private static final long serialVersionUID = 1L;
    private int id;
    private String name;
    private String categories;
    private double price;

    public Product(int id, String name, String categories, double price) {
        this.id = id;
        this.name = name;
        this.categories = categories;
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCategories() {
        return categories;
    }

    public void setCategories(String categories) {
        this.categories = categories;
    }

    public double getPrice() {
        return price;
    }

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

Test类：

import java.io.*;

public class Test {
    public static void main(String[] args) {
        Product iphone = new Product(1, "iPhone", "Mobile Phone", 6999.0);
        Product ipad = new Product(2, "iPad", "Tablet", 3999.0);
        Product macbook = new Product(3, "MacBook", "Laptop", 12999.0);
        Product iwatch = new Product(4, "iWatch", "Smart Watch", 1999.0);

        ObjectOutputStream oos = null;
        ObjectInputStream ois = null;

        try {
            // 写入对象
            oos = new ObjectOutputStream(new FileOutputStream("product.dat"));
            oos.writeObject(iphone);
            oos.writeObject(ipad);
            oos.writeObject(macbook);
            oos.writeObject(iwatch);

            // 读取对象并输出到控制台
            ois = new ObjectInputStream(new FileInputStream("product.dat"));
            Product p = null;
            while ((p = (Product) ois.readObject()) != null) {
                System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getCategories() + "\t" + p.getPrice());
            }
        } catch (EOFException e) {
            // 读到文件末尾
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                if (oos != null) {
                    oos.close();
                }
                if (ois != null) {
                    ois.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

运行结果：

1	iPhone	Mobile Phone	6999.0
2	iPad	Tablet	3999.0
3	MacBook	Laptop	12999.0
4	iWatch	Smart Watch	1999.0