Question

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.

Closed 11 years ago.

我是新来爪哇的所以请温柔点...

考虑以下 SchoppingList 类 :

public class ShoppingList {
...
    public ItemPrices[] getSortedPrices(){
        //do sorting stuff here etc
        return ret.toArray(new ItemPrices[0]);
    }
}

现在我有另一个班级叫做 hello :

public class Hello {
...
    private Groceries createGroceries() {
    ...
         pricearray[] =  ShoppingList.ItemPrices[] //????
    ...
    }
}

我要指定我创建的数组价格数组, 以等同于在方法中返回的 ProjectPrice 数组。

但是,我没有得到我想要的,什么才是这样做的正确方法?

Answer 1

除非该方法 getSortedPrices 是一种静态方法, 您需要从 SwessList 类的示例中调用它, 所以您应该创建以下实例

public class Hello {
...
    private Groceries createGroceries() {
    ...
        ShoppingList sList = new ShoppingList();
        PriceList [] pricearray =  sList.getSortedPrices() //you call a method by its name, not return type.
    ...
    }
}

而且,我不明白如何

(项目收费是双倍)。

is it supposed to be an array of doubles, or an array of instance of the class ItemPrices? if its supposed to be an array of doubles, you need to do this:

public class ShoppingList {
...
    public double[] getSortedPrices(){
        //do sorting stuff here etc
        return new double[n] // n is the length of the array
    }
}

线条和直线

PriceList [] 价格阵列 = sist.getSordtedPrices ()

应该是

双 [] 价格阵列 = sist.getSordedPrices ()

Answer 2

你不必专注于其他的问题, 你必须做一些事情,比如

ShoppingList sl = new ShoppingList();
ItemPrices[] pricearray =  sl.getSortedPrices();

但这需要你们知道类型、构建器、阵列, 如何称呼方法和其他许多东西!

友情链接