packagetest01;importjava.math.BigDecimal;importjava.util.ArrayList;importjava.util.Iterator;importjava.util.List;//计算类

public classGashaponMachines {private Listprizes;//概率

private static BigDecimal LOTTERY_PROBABILITY_DERIVATIVE = new BigDecimal(0);//商品权重

private longnum;//设置随机数的范围

privateBigDecimal odds;//返回对象

privateMessage message;publicGashaponMachines() {

prizes= new ArrayList();

num= 0;

}public voidaddPrizes(Prize prize) {

prizes.add(prize);//商品的总数 0-500 501-1000 1001-1500

num +=prize.getPrizeNum();

}//获取随机数的范围

publicBigDecimal getOdds() {//随机数范围

odds = new BigDecimal(num).multiply(LOTTERY_PROBABILITY_DERIVATIVE); //设置随机数的范围

System.out.println("随机数的范围为" +odds.longValue());returnodds;

}//获取概率范围

public BigDecimal getlotteryProbabilityDerivative(String lotteryProbability,intscale) {if (scale < 0) {throw new IllegalArgumentException("这个精度必须大于零或者等于零");

}

String total="1";

BigDecimal b1= newBigDecimal(total);

BigDecimal b2= newBigDecimal(lotteryProbability);

LOTTERY_PROBABILITY_DERIVATIVE=b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP);

System.out.println("概率次数为" +LOTTERY_PROBABILITY_DERIVATIVE);returnLOTTERY_PROBABILITY_DERIVATIVE;

}//进行比较

public void takePrize(intrnum) {if (rnum >num) {

System.out.println("随机数大于总得奖品数！没有中奖！！！！！");

}else{//奖品等级区间//寻找随机数掉到什么范围内//pn 奖品等级范围

long pn =num;

Iterator iterator =prizes.iterator();while(iterator.hasNext()) {

Prize p=iterator.next();

pn-=p.getPrizeSum();//范围在递减

if (rnum >pn) {//中奖了

System.out.println("中奖了！！！" +p.getPrizeName());//减少库存

p.setPrizeNum(p.getPrizeNum() - 1);//库存为0 删除奖品

if (p.getPrizeNum() == 0) {

iterator.remove();

System.out.println("抽空了");

System.out.println("剩余奖品：" + num + " 区间:" +odds.longValue());

}return;

}

}

}

}//判断商品库是否为空

public booleanisEmpty() {returnprizes.isEmpty();

}//刷新奖池

publicBigDecimal refresh() {

num= 0;for (int i = 0; i < prizes.size(); i++) {

num+=prizes.get(i).getPrizeSum();

}

odds= newBigDecimal(num).multiply(LOTTERY_PROBABILITY_DERIVATIVE);

System.out.println("随机数的范围是"+odds);returnodds;

}

}