Single or multiple random number generators?

[mtanti]

I'm programming in Java and using the Random class and I'm not sure if it makes a difference whether I use a single accessible Random object for the whole program or if I should create multiple instances (one for each object needing it?). Are there disadvantages to using one instead of the other?

I'm assuming that it would help to be able to reuse the same seed on a single random object in order to re-create the same sequence of random numbers during debugging and comparisons.

Thanks.

 

[DavidSnider]

I'm programming in Java and using the Random class and I'm not sure if it makes a difference whether I use a single accessible Random object for the whole program or if I should create multiple instances (one for each object needing it?). Are there disadvantages to using one instead of the other?

I'm assuming that it would help to be able to reuse the same seed on a single random object in order to re-create the same sequence of random numbers during debugging and comparisons.

Thanks.

It depends on the application. If you can get away with just one that is best. Instantiating new objects takes both processor and memory resources.

 

[quicknote]

I would recommend using a single random number generator for your program. This is because using multiple instances of the Random class can lead to inconsistent and unpredictable results. Each instance will have its own seed and therefore produce a different sequence of random numbers. This can make it difficult to reproduce results and compare data.

Furthermore, using a single random number generator allows for better control and management of the random number generation process. You can set and reset the seed as needed, ensuring that the same sequence of numbers is generated for debugging and comparisons.

However, it is important to note that the Random class in Java is not truly random, as it is based on a pseudo-random number generator algorithm. This means that the sequence of numbers generated may not be truly random and can be predicted given enough information. If true randomness is crucial for your program, you may want to consider using a different random number generator library.

In conclusion, for consistency and control, it is recommended to use a single random number generator in your Java program. However, if true randomness is essential, consider using a different library or implementing additional methods to ensure randomness.