Why Does My Java Random Number Generator Always Return the Same Number Despite Setting a Seed?

Java Random Number Generator Always Returns Same Number Despite Seed

In the provided Java code, despite setting a seed, the random number generator consistently yields the same number. The issue arises when creating a new Random object for each method call. This ensures that a new seed is generated each time, resulting in the repetition of random numbers.

To resolve this, it is essential to share a single Random instance across the entire class. By incorporating this change, we guarantee that the seed is set just once, leading to a sequence of genuinely random numbers.

public class Numbers {
    // Shared Random instance
    private Random randnum = new Random();

    public int random(int i) {
        randnum.setSeed(123456789);
        return randnum.nextInt(i);
    }
}

With this modification, subsequent calls to the random method will return different numbers, adhering to the constraints of having a fixed seed.

The above is the detailed content of Why Does My Java Random Number Generator Always Return the Same Number Despite Setting a Seed?. For more information, please follow other related articles on the PHP Chinese website!