Math.random()

[Aaron Fude]

Hi,

Is there a way to reset the seed globally so that Math.random() starts
returning the same numbers every time the program is executed or is using
java.util.Random the only way to it?

Thanks,

Aaron Fude

 

[Roedy Green]

Is there a way to reset the seed globally so that Math.random() starts
returning the same numbers every time the program is executed or is using
java.util.Random the only way to it?

you need java.util.Random. Math.random is just a shortcut.

 

[Aaron Fude]

you need java.util.Random. Math.random is just a shortcut.

Which means that I need a class with contains a static instance of
java.util.Random (if I want the setting to be program-wide)? Wondering why
java does not provide such a class.

 

[Michael Borgwardt]

Which means that I need a class with contains a static instance of
java.util.Random (if I want the setting to be program-wide)?

Not necessarily. What you most need is to initialize your Random objects
with a fixed seed.

Wondering why
java does not provide such a class.

Because it's trivial to do and not needed all that often?

 

[Oscar kind]

Which means that I need a class with contains a static instance of
java.util.Random (if I want the setting to be program-wide)? Wondering why
java does not provide such a class.

Java does; by way of Math.random(). It's just that if you need a seeded
random generator, there are so many possibilities that it's better to
create a singleton in your program (at least IMHO).


Oscar