Java8：在forEach之外更改变量的引用

我尝试在onc做两件事： 1.列表中对象特定字段的总和

AtomicReference<BigDecimal> doReqQtySum = new AtomicReference<>(BigDecimal.ZERO);
AtomicReference<BigDecimal> boQtySum = new AtomicReference<>(BigDecimal.ZERO);
models.forEach(detail -> {
    doReqQtySum.accumulateAndGet(detail.getDoReqQty(), (bg1, bg2) -> bg1.add(bg2));
    boQtySum.accumulateAndGet(detail.getBoQty(),  (bg1, bg2) -> bg1.add(bg2));
});

2.从列表中过滤对象

DoRequestDetailModel originProductRequestDetail = models.stream()
    .filter(m -> m.getIsOriginProduct())
    .reduce((a, b) -> {
         throw new IllegalStateException();
    })
    .get();

我想要此代码，但它不起作用：

AtomicReference<BigDecimal> doReqQtySum = new AtomicReference<>(BigDecimal.ZERO);
AtomicReference<BigDecimal> boQtySum = new AtomicReference<>(BigDecimal.ZERO);
DoRequestDetailModel originProductRequestDetail = new DoRequestDetailModel();
models.forEach(detail -> {
     doReqQtySum.accumulateAndGet(detail.getDoReqQty(), (bg1, bg2) -> bg1.add(bg2));
     boQtySum.accumulateAndGet(detail.getBoQty(),  (bg1, bg2) -> bg1.add(bg2));
     if(detail.getIsOriginProduct()) {
          originProductRequestDetail = detail;
     }
});

下一个代码可以完成

AtomicReference<BigDecimal> doReqQtySum = new AtomicReference<>(BigDecimal.ZERO);
AtomicReference<BigDecimal> boQtySum = new AtomicReference<>(BigDecimal.ZERO);
List<DoRequestDetailModel> tempList = new ArrayList<>();
models.forEach(detail -> {
    doReqQtySum.accumulateAndGet(detail.getDoReqQty(), (bg1, bg2) -> bg1.add(bg2));
    boQtySum.accumulateAndGet(detail.getBoQty(),  (bg1, bg2) -> bg1.add(bg2));
    if(detail.getIsOriginProduct()) {
         tempList.add(detail);
    }
});

有更好的解决方案吗？

问题来源：Stack Overflow