如何在 Java 中表示整数间隔？

Question

We all know about intervals in mathematics (eg -4 < x < 3).

How can I represent these mathematic intervals in Java, eg, the numbers between -4 and 3 (-4, -3, ..., 2, 3 etc)?

Answer 1

Check apache commons-lang IntRange . So, if you want to check if a number is in a given interval (range), you do:

IntRange range = new IntRange(-4, 3);
if (range.contains(x)) {
   ....
}

Answer 2

You simply have to separate -4 < x < 3 into -4 < x and x < 3 , like this:

if (-4 < x && x < 3)
{
. . .
}

Answer 3

Google Guava 还有一个 Range 类（ https://guava.dev/releases/19.0/api/docs/com/google/common/collect/Range.html ）可能适合您。