在java语言中用继承，数组写一个已知某个农产品的质量和体积，计算平均质量和平均体积，判断农产品属于哪类农产品”的代码

以下是Java代码：

public class FarmProduct {
    protected double quality;
    protected double volume;

    public FarmProduct(double quality, double volume) {
        this.quality = quality;
        this.volume = volume;
    }

    public double getQuality() {
        return quality;
    }

    public double getVolume() {
        return volume;
    }
}

public class Grain extends FarmProduct {
    public Grain(double quality, double volume) {
        super(quality, volume);
    }
}

public class Fruit extends FarmProduct {
    public Fruit(double quality, double volume) {
        super(quality, volume);
    }
}

public class Main {
    public static void main(String[] args) {
        FarmProduct[] products = new FarmProduct[5];
        products[0] = new Grain(10, 20);
        products[1] = new Grain(15, 25);
        products[2] = new Fruit(5, 10);
        products[3] = new Fruit(8, 12);
        products[4] = new Fruit(12, 15);

        double totalQuality = 0;
        double totalVolume = 0;
        for (FarmProduct product : products) {
            totalQuality += product.getQuality();
            totalVolume += product.getVolume();
        }

        double avgQuality = totalQuality / products.length;
        double avgVolume = totalVolume / products.length;

        if (avgQuality > 10 && avgVolume > 15) {
            System.out.println("这是高质量大体积的农产品");
        } else if (avgQuality > 10 && avgVolume <= 15) {
            System.out.println("这是高质量小体积的农产品");
        } else if (avgQuality <= 10 && avgVolume > 15) {
            System.out.println("这是低质量大体积的农产品");
        } else {
            System.out.println("这是低质量小体积的农产品");
        }
    }
}

这段代码定义了一个 FarmProduct 类，它有两个属性：quality 和 volume，分别表示农产品的质量和体积。然后定义了两个子类 Grain 和 Fruit，分别表示谷物和水果。在 Main 类中，创建了一个 FarmProduct 数组，包含了 5 个不同的农产品。然后遍历数组，计算出所有农产品的平均质量和平均体积，并根据平均质量和平均体积的大小判断农产品属于哪一类。