How to express range in java

The range in Java represents a set of continuous integers, which can be expressed in the following ways: closed interval [start, end], including start and end; open interval (start, end), excluding start and end; semi-open interval [start, end) or (start, end], respectively excludes or includes end; unbounded interval (-∞, end) or (start, ∞), represents all integers less than or greater than the value.

Representation of range in Java

In Java, a range is represented as a set of consecutive integers. It can be represented in the following way:

1. Closed interval

<code class="java">[start, end]</code>

For example:

<code class="java">[1, 10] // 包含 1 和 10</code>

2. Open interval

<code class="java">(start, end)</code>

For example:

<code class="java">(1, 10) // 包含 2-9，但不包含 1 和 10</code>

3. Half-open interval

<code class="java">[start, end)</code>

For example:

<code class="java">[1, 10) // 包含 1-9，但不包含 10</code>

<code class="java">(start, end]</code>

For example:

<code class="java">(1, 10] // 包含 2-10，但不包含 1</code>

4. Unbounded interval

<code class="java">(-∞, end)</code>

For example:

<code class="java">(-∞, 10) // 包含所有小于或等于 10 的整数</code>

<code class="java">(start, ∞)</code>

For example:

<code class="java">(5, ∞) // 包含所有大于或等于 5 的整数</code>

Notes

• The starting point and end of the interval Points must be integers.
• Intervals cannot overlap.
• Unbounded intervals represent infinite ranges, and can be used to represent concepts such as all integers or all positive integers.

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