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Why Does Setting the Seed in Java's Random Number Generator Result in Repeated Outputs?

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2024-11-12 19:04:02336browse

Why Does Setting the Seed in Java's Random Number Generator Result in Repeated Outputs?

Resolving the Issue of Repetitive Random Number Generation in Java with Set Seed

Issue Description:

Implementing a random number generator, developers may encounter a situation where calling the random number method, despite setting the seed, continuously generates the same output.

Code Example:

Consider the following code snippet:

Upon calling numbers.random(10) multiple times, it persistently returns an identical number, such as 5, instead of different outputs.

Resolution:

To ensure the generation of unique random numbers with a predefined seed, the Random() instance must be shared across the entire class. This can be achieved through the following code modification:

By initializing the randnum instance within the class constructor, it becomes a shared resource accessible to all methods within the class. This ensures that the seed is set only once, and subsequent calls to the random() method generate different random numbers.

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