Java中的加权随机性

Item[] items = …;

// Compute the total weight of all items togetherdouble totalWeight = 0.0d;for (Item i : items){    totalWeight += i.getWeight();}// Now choose a random itemint randomIndex = -1;double random = Math.random() * totalWeight;for (int i = 0; i < items.length; ++i){    random -= items[i].getWeight();    if (random <= 0.0d)    {        randomIndex = i;        break;    }}Item myRandomItem = items[randomIndex];