Question

Population growth – Object-oriented programming JAVA
java programme

It is possible to propose a discrete simulation of the growth of a rabbit population in the absence of predators. This supposes that we take into account the birth and death of rabbits. As for many biological models, we have incomplete or imprecise field data and we must take modeling choices. For instance here are some information we have for Garenne rabbits: females can give birth approximatively every month. Female are able to give 4 to 8 liters per year, but there is more chance to have 5,6 or 7 litters. For each litter you have 3 to 6 baby rabbits. A random drawing can determine if such baby rabbits are a males or females; the natural probability being approximatively around 50%. Decide your probabilities. Sexual maturity is reached between 5 to 8 months after the birth of baby rabbits. We can also simulate the probability of death according to the rabbit age, this can be given by proposing simple rules about survival. For adults (rabbits at sexual maturity), the survival rate is 50%, for little rabbits it is only 20%. When a rabbit reaches 11 years old, its survival rate is diminished by 10% every year, reaching 0% at 15 years old (meaning death at 15 years old). This model is more realistic than a Fibonnaci growth, it can be simulated with the input parameters and probability laws that you will decide. You can find more realistic values using the Internet or Wikipaedia depending on the rabbit species.

Answer 1

import java.util.Scanner;

02	public class Population

03

{

04	public static void main(String[] args)

05

{

06	//Declarations

07	double percentage = .02f;

08

09	int population;

10

11

12	String county;

13	String response;

14

15

16	double years;

17

18

19	Scanner input = new Scanner(System.in);

20	while(true){

21	System.out.println("What is your county? ");

22	county = input.next();

23

24	System.out.println("What is your population size? ");

25	population = input.nextInt();

26

27

28

29	for(int i = 0; i < 20; ++i){

30	years = population * percentage;

31	System.out.printf("After %d years the population is is %.2f%n", (i + 1),years);

32

33

}

34	System.out.println("Do you want to see another record? Type Y or N...");

35	response = input.next();

36	if(response.equals("N")) break;

37

}

38	System.out.println("Population never expected to double. ");

39

40

41

}

42

}