java - 在arrayList java中计算对象的权重

Question

我正在尝试计算此项目数组列表中项目的权重。但是它没有正确添加项目？谁能明白为什么会这样？

int totalWeight = 0;
for (Item i : items) {
    totalWeight = totalWeight + i.getWeight();
}
return totalWeight;

Answer 1

请提供Item课程代码。它可能看起来像这样：

public class Item {
    public Item(int weight) {
        this.weight = weight;
    }

    public int getWeight() {
        return weight;
    }

    public void setWeight(int weight) {
        this.weight = weight;
    }
    int weight;
}

用法：

ArrayList<Item> items = new ArrayList<Item>();
// add something here

int totalWeight = 0;

for(Item i: items){
    totalWeight = totalWeight + i.getWeight();
}