Question

我有一个代表产品的Product类：

import java.util.ArrayList;

public class Product {
    private int productId;
    private String productType;
    private String brand;
    private double price;

    public Product(int productId, String productType, String brand, double price)
    {
        this.productId = productId;
        this.productType = productType;
        this.brand = brand;
        this.price = price;
    }

    public int getProductId() {
        return this.productId;
    }

    public void setProductId(int productId) {
        this.productId = productId;
    }

    public String getProductType() {
        return this.productType;
    }

    public void setProductType(String productType) {
        this.productType = productType;
    }

    public String getBrand() {
        return this.brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public double getPrice() {
        return this.price;
    }

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

现在，在我的程序中，我想创建这个Product类的3个随机对象，这是我的代码：

public static void main(String[] args) {
    ArrayList<Product> products = new ArrayList();
    Random r = new Random();

    for(int i = 0; i < 3; i++)
    {
        products.add(new Product(1337, "Type", "Brand", 300.33));
    }
}

现在，我的问题是如何实现以便随机类创建随机值？我已经为产品创建了静态值，那么如何将其随机化，以便获得3个不同的值？

Answer 1

在不知道要随机化Product的哪个元素的情况下，人们只能继续猜测。下面给出的代码不是您问题的解决方案；而是为您提供有关如何使用随机生成的值的指针：

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Product {
    private int productId;
    private String productType;
    private String brand;
    private double price;

    public Product(int productId, String productType, String brand, double price) {
        this.productId = productId;
        this.productType = productType;
        this.brand = brand;
        this.price = price;
    }

    public int getProductId() {
        return this.productId;
    }

    public void setProductId(int productId) {
        this.productId = productId;
    }

    public String getProductType() {
        return this.productType;
    }

    public void setProductType(String productType) {
        this.productType = productType;
    }

    public String getBrand() {
        return this.brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public double getPrice() {
        return this.price;
    }

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

    @Override
    public String toString() {
        return "Product [productId=" + productId + ", productType=" + productType + ", brand=" + brand + ", price="
                + price + "]";
    }

    public static void main(String[] args) {
        List<Product> products = new ArrayList<>();
        Random r = new Random(10);
        int num;
        for (int i = 0; i < 3; i++) {
            num = r.nextInt(10);
            products.add(new Product(r.nextInt(10000), "Type" + num, "Brand" + num, 1000 * r.nextDouble()));
        }
        products.stream().forEach(System.out::println);
    }
}

示例运行：

Product [productId=2380, productType=Type3, brand=Brand3, price=257.8027905957804]
Product [productId=1456, productType=Type6, brand=Brand6, price=244.11725056425314]
Product [productId=6214, productType=Type1, brand=Brand1, price=370.6111260136414]

如有需要，请随时发表评论。

从产品类创建随机对象

1 个答案: