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

[start, end]

For example:

[1, 10] // 包含 1 和 10

2. Open interval

(start, end)

For example:

(1, 10) // 包含 2-9，但不包含 1 和 10

3. Half-open interval

[start, end)

For example:

[1, 10) // 包含 1-9，但不包含 10

(start, end]

For example:

(1, 10] // 包含 2-10，但不包含 1

4. Unbounded interval

(-∞, end)

For example:

(-∞, 10) // 包含所有小于或等于 10 的整数

(start, ∞)

For example:

(5, ∞) // 包含所有大于或等于 5 的整数

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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