Java random always returns the same number when I set the seed?

Question

I require help with a random number generator I am creating. My code is as follows (inside a class called numbers):

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

When I call this method from another class (in order to generate a random number), it always returns the same number. For example if I were to do:

System.out.println(numbers.random(10)); System.out.print(numbers.random(10)); 

it always prints the same number e.g. 5 5. What do I have to do so that it prints two different numbers e.g. 5 8

It is mandatory that I set the seed.

Thanks

Answer 1

You need to share the Random() instance across the whole class:

public class Numbers {     Random randnum;      public Numbers() {         randnum = new Random();         randnum.setSeed(123456789);     }      public int random(int i){         return randnum.nextInt(i);     } }