How can I generate varying random numbers in Java when using the same seed?

Random Number Generation with Seed in Java

When generating random numbers, it's common practice to use a seed to ensure reproducibility of results. However, in cases where seemingly identical numbers are produced, troubleshooting is necessary.

In the provided code:

double randomGenerator(long seed) {
    Random generator = new Random(seed);
    double num = generator.nextDouble() * (0.5);

    return num;
}

Using the same seed consistently will result in identical number sequences. This is a crucial aspect of testing, allowing for controlled randomness when reproducing results.

To resolve the issue and generate varying sequences, utilize the zero-argument constructor for Random, which harnesses the nanosecond timestamp to initialize a unique seed. For example:

private Random generator = new Random();
double randomGenerator() {
    return generator.nextDouble() * 0.5;
}

By maintaining the Random instance outside the method, the internal seed state remains persistent, providing a distinct sequence for each invocation. This approach ensures true randomness while accommodating the need for unique number sequences.

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