如何比较存储在 List<Long> 中的值具有长期价值? [英] How to compare values stored in List&lt;Long&gt; with a long value?

问题描述

我正在检索一些长值并将其存储在 List 中.

I'm retrieving some long values and storing it in List<Long> l.

这是List的注销值；l:

D/lng: [2197, -1007, 4003]

然后，我尝试将它与 <=900 或 >900 等 long 值进行比较.

Then, I'm trying to compare it with long values like <=900 or >900.

方法如下:

    public void filterRequests(final List<Long> l) {

            final int size = l.size();
            int i;

            for (i = 0; i < size; i++){

            }
            Log.d("lng", String.valueOf(l));

            if (l.get(i) <= 900) {
                 // do the logic when l <= 900       
            } else {
            }

    }

问题在于 if (l.get(i) <= 900) 或 if (l.get(i) > 900) 都不是即使 l.get(i) 具有 <=900 和 >900 的值也能工作，请参阅:D/lng: [2197, -1007, 4003]

The problem is that if (l.get(i) <= 900) or if (l.get(i) > 900) both is not working even when the l.get(i) has values both <=900 and >900, see: D/lng: [2197, -1007, 4003]

UPDATE:@HarisQureshi 的回答有效，但问题是 for 循环的原因，里面的 if 条件被调用3 次，而我希望它只被调用一次.所以，我想知道有没有办法在该代码上方定义 for 循环，然后在 if (l.get(i)<= 900) 和 if (l.get(i) > 900) 条件?

UPDATE: @HarisQureshi 's answer worked but the problem is that cause of the for loop, the if condition inside is getting called 3 times while I want it to get called only once. So, I want to know that is there a way to define for loop above that code and then use the i in the if (l.get(i) <= 900) and if (l.get(i) > 900) conditions?

推荐答案

你用Long做了一个list，List和Long都是不是原始数据类型.在您的问题中，您正在比较原始数据类型和非原始数据类型，为了比较，比较器的两侧应该具有相同的数据类型.

You made a list with Long, both List and Long are not primitive data types. In your question you are comparing primitive and non primitive data types, for comparison both sides of a comparator should be of same data types.

你在做什么:

if (l.get(i) <= 900)

这里 l.get(i) 返回一个 Long 值，其中 900 是整数值.

Here l.get(i) returns a Long value where as 900 is integer value.

你应该做什么:

通过执行 900L

if (l.get(i) <= 900L)

或者

if (l.get(i) > 900L)

这篇关于如何比较存储在 List<Long> 中的值具有长期价值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！