Question

3. Develop a random number generator that generates two-digit decimal numbers where individual digits appear with the following probabilities: digit 1 2 3 probability 0.1 0.2 0.3 0.4 For example, the number 43 (and 34) will be generated in 12% of cases, while l I will appear only in 1 % of cases.

Answer 1

import java.util.Random;

public class RandomGenerator {

    private Random random;

    public RandomGenerator() {
        random = new Random();
    }

    public int getNextInt() {
        return (10 * generateDigit()) + generateDigit();
    }

    private int generateDigit() {
        double value = random.nextDouble();
        if(value <= 0.1) {
            return 1;
        } else if(value <= 0.3) {
            return 2;
        } else if(value <= 0.6) {
            return 3;
        } else {
            return 4;
        }
    }

}

public class RandomGeneratorTest {

    public static void main(String[] args) {
        RandomGenerator randomGenerator = new RandomGenerator();
        for(int i = 0; i < 10; ++i) {
            System.out.println(randomGenerator.getNextInt());
        }
    }

}

14 34 42 23 24 42 Process finished with e xit code 0