How to use one object value in different classes in java

Question

Hi I will be generating a Random number

Random randomno = new Random();
int random = randomno.nextInt(10000);

I want use this random number value in different class. If I create the Object of this class, every time this values changes. But for one execution I want to maintain one value throughout the application.

Paolo has a point, but also you could think of adding this into a method and not a class.... it would be more functional... — Sir. Hedgehog
– Sir. Hedgehog, Commented Aug 16, 2016 at 7:20

nbokmans · Accepted Answer · 2016-08-16 07:23:06Z

2

If you want to have a re-usable method to generate a random number, you could create a special class that does that for you:

import java.util.Random;

public class RandomNumberGenerator {

    private static final Random RANDOM = new Random();


    private RandomNumberGenerator() {

    }

    //Usage: RandomNumberGenerator.getRandomNumber(10000);
    public static int getRandomNumber(int max) {
        return RANDOM.nextInt(max);
    }
}

This can in turn be used in another class and results can be saved to an arraylist or whatever you like. Example demo:

public class Main {
    public static void main(String[] args) {
        final List<Integer> randomNumbers = new ArrayList<>();

        for (int i = 0; i < 10; i++) {
            randomNumbers.add(RandomNumberGenerator.getRandomNumber(10000));
        }
    }
}

answered Aug 16, 2016 at 7:23

nbokmans

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2 Comments

Kiran Sk Over a year ago

Random number generated from RandomNumberGenerator can be used anywhere and these random will get stored in Main class ?

nbokmans Over a year ago

That depends on where you save them: if you wanted to you could declare a static List<Integer> in the RandomNumberGenerator class and store them in there, so the random numbers are maintained throughout the entire application.

Yogesh Rathi · Accepted Answer · 2016-08-16 07:24:27Z

0

Possible way:

1) Add your code in application class, and there make one field as static, any anywhere you want this field you can use it. (recommended)

2) Store data in shared pred or db.

3) make a singleton pattern which is answer given by nbokmans user.

answered Aug 16, 2016 at 7:24

Yogesh Rathi

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