How to express the range of a number in java

The methods for expressing numerical ranges in Java are: 1. Closed interval [a, b]; 2. Open interval (a, b); 3. Semi-open interval [a, b) or (a, b ]; 4. Unbounded intervals (-∞, ∞). Closed intervals can be efficiently searched using Arrays.binarySearch(), and open/semi-open intervals can be sorted and binary searched using Arrays.sort().

##Representing a range of numbers in Java

There are many ways to represent a range of numbers in Java:

1. Use closed intervals:

Use [

and

] to represent a closed interval, including endpoints:

<code class="java">int[] range = {1, 5}; // 表示范围 [1, 5]</code>

2. Use open intervals:

Use (

and

) to represent an open interval, excluding endpoints:

<code class="java">int[] range = (1, 5); // 表示范围 (1, 5)</code>

3. Use half-open intervals:

Use [

and

) or ( and ] to represent half-open intervals Open intervals, including one endpoint and excluding the other:

<code class="java">int[] range = [1, 5); // 表示范围 [1, 5)
int[] range = (1, 5]; // 表示范围 (1, 5]</code>

4. Use unbounded intervals:

Use -∞

and

∞ represents an unbounded interval, including all numbers:

<code class="java">int[] range = (-∞, ∞); // 表示范围 (-∞, ∞)</code>

Note:

For closed intervals, you can use

Arrays. The binarySearch()

method efficiently searches for an element.
• For open intervals and semi-open intervals, you can use the Arrays.sort()
method to sort the array, and then use binary search to find the element. .
• Unbounded intervals are often used in theoretical mathematics and are rarely used in practical applications.

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