打卡，老师看看还有什么需要改的地方吗？

来源：5-3 自由编程

谁叫我这么坏

2020-10-17 17:53:11

package onlytest;

import java.io.Serializable;

public class Product implements Serializable {
private int id;
private String name;
private String categories;
private double price;

public Product() {

}

public Product(int id, String name, String categories, double price) {
super();
this.setId(id);
this.setName(name);
this.setCategories(categories);
this.setPrice(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;
}

public String toString() {
return "产品ID：" + this.getId() + "\n产品名称：" + this.getName() + "\n产品属性：" + this.getCategories() + "\n产品价格："
+ this.getPrice() + "元\n";
}
}
package onlytest;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

public class ProductTest {

	public static void main(String[] args) {
		Product iphone = new Product(123, "iphone", "telephone", 4888.0);
		Product ipad = new Product(234, "ipad", "computer", 5088.0);
		Product macbook = new Product(345, "macbook", "computer", 10688.0);
		Product iwatch = new Product(256, "iwatch", "watch", 4799.0);

		try {
			FileOutputStream fos = new FileOutputStream("apple.txt");
			FileInputStream fis = new FileInputStream("apple.txt");

			ObjectOutputStream oos = new ObjectOutputStream(fos);
			oos.writeObject(iphone);
			oos.writeObject(ipad);
			oos.writeObject(macbook);
			oos.writeObject(iwatch);
			oos.writeObject(null);

			oos.flush();
			oos.close();
			fos.close();

			ObjectInputStream ois = new ObjectInputStream(fis);
			Product product = null;
			while ((product = (Product) ois.readObject()) != null) {

				System.out.println(product);
			}
			ois.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}