您不需要定义二维数组，只需维护产品的一维数组，并维护需要考虑平均值的合格项的计数（在您的情况下是不可用的项）
此代码将在单个循环中运行，而不需要嵌套循环

public class Test {

    public static void main(String[] args) {

        double total = 0;
        int notAvailableItems = 0;

        Products[] names = new Products[] { new Products("k7580", 6500, "yes") ,
                 new Products("k8570", 7333, "no") ,  new Products("k8580", 766, "no") ,
                new Products("k6580", 288, "yes")} ;

        for (int i = 0; i < names.length; i++) {

                Products product = names[i];
                if(product.getAvailable().equals("no"))
                {
                    total = total + product.getPrice();
                    notAvailableItems++;
                }

            }
        double average =  total /(double)notAvailableItems;
        System.out.println("average of price :" + average);
    }
}

产量-平均价格：4049.5

你需要定义一个 count 根据if条件每次递增的变量( available.equals("no") )仅计算满足条件的元素：

double total = 0;
Products[][] names = new Products[][] { { new Products("k7580", 6500, "yes") },
        { new Products("k8570", 7333, "no") }, { new Products("k8580", 766, "no") },
        { new Products("k6580", 288, "yes") } };

int count = 0;
for (int i = 0; i < names.length; i++) {
    for (int j = 0; j < names[i].length; j++) {
        String available = names[i][j].getAvailable();
        if (available.equals("no")) {
            count++;
            total +=names[i][j].getPrice();
        }
    }
    System.out.println("");
}

// from here I am not able to find average

double average = total / count;
System.out.println("average of price :" + average);

如果您使用java 8或更高版本，则可以使用它：

public static void main(String[] args) {
    Products[][] names = new Products[][]{
            {new Products("k7580", 6500, "yes")},
            {new Products("k8570", 7333, "no")},
            {new Products("k8580", 766, "no")},
            {new Products("k6580", 288, "yes")}
    };

    Arrays.stream(names)
            .flatMap(array -> Arrays.stream(array))
            .filter(products -> products.getAvailable().equals("no"))
            .mapToDouble(Products::getPrice)
            .average()
            .ifPresent(average -> System.out.println("average of price :" + average));
}

输出为：

average of price :4049.5

如你所见，它很简洁。我在这里用过小溪。流有助于减少代码的冗长。