用于循环遍历 Java 中的列表的有效方法

Question

I have a function logic that will fail the process if there are price dtos that have null item & current price properties.

I was wondering if there's a more efficient or cleaner way to do this in Java. In streams or any other.

Here is my current code:

List<PriceDto> priceDtoList = thisIsAClass.getPriceDtos();

 for (PriceDto priceDto: priceDtoList) {
        if (priceDto.getItem() == null && priceDto.getCurrentPrice() == null) 
         {
            thisIsAnotherClass.failTheProcess();
            break;
        }
    }

  thisIsAnotherClass.anotherProcess();

Thank you in advance for your help!

Answer 1

The more common way in newer version Java would be to use findFirst or findAny .

For example,

List<PriceDto> priceDtoList = thisIsAClass.getPriceDtos();

Optional<PriceDto> result = list
            .stream()
            .filter(dto -> dto.getItem() ==null && dto.getCurrentPrice() == null)
            .findAny();


if(result.isPresent()) {
     thisIsAnotherClass.failTheProcess();
}

  thisIsAnotherClass.continueTheProcess();

If you have a lot of data in the list you could also look at adding a .parallel() call to the stream to improve overall performance of the search.