How to Generate Random Doubles Within a Specific Range in Java?

Generating Random Doubles Within a Specified Range

When dealing with double values, it often becomes necessary to generate random values within a predefined range. While the Random class provides the nextDouble() method, it doesn't allow for specifying a range.

Customizing Double Generation

To achieve random double generation within a range, we can utilize the following formula:

<code class="java">rangeMin + (rangeMax - rangeMin) * r.nextDouble()</code>

where:

• rangeMin represents the minimum value of the desired range.
• rangeMax represents the maximum value of the desired range.
• r is an instance of the Random class.

Example Usage

Suppose we have two doubles min = 100 and max = 101. To generate a random double within this range, use the following code:

<code class="java">Random r = new Random();
double randomValue = 100 + (101 - 100) * r.nextDouble();</code>

This calculation ensures that the generated random value falls between 100 (inclusive) and 101 (exclusive).

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