//Species.java

import java.io.Serializable;
import java.util.Scanner;

/**
 Serialized class for data on endangered species.
*/
public class Species implements Serializable
{
    private String name;
    private int population;
    private double growthRate;

    public Species()
    {
        name = null;
        population = 0;
        growthRate = 0;
    }

    public Species
    (
        String initialName,      //in
        int initialPopulation,   //in
        double initialGrowthRate //in
    )
    {
        name = initialName;
        if (initialPopulation >= 0)
            population = initialPopulation;
        else
        {
            System.out.println("ERROR: Negative population.");
            System.exit(0);
        }
        growthRate = initialGrowthRate;
    }

    public String toString()
    {
        return ("Name = " + name
            + "\nPopulation = " + population
            + "\nGrowth rate = " + growthRate + "%");
    }

    public void readInput()
    {
        Scanner keyboard = new Scanner(System.in);
        System.out.print("What is the species' name? ");
        name = keyboard.nextLine();

        System.out.println("What is the population of the species? ");
        population = keyboard.nextInt();
        while (population < 0)
        {
            System.out.println("Population cannot be negative.");
            System.out.print("Reenter population: ");
            population = keyboard.nextInt( );
        }

        System.out.print("Enter growth rate (% increase per year): ");
        growthRate = keyboard.nextDouble();
    }

    public void writeOutput()
    {
         System.out.println("Name = " + name);
         System.out.println("Population = " + population);
         System.out.println("Growth rate = " + growthRate + "%");
    }

    /**
     Precondition: years is a nonnegative number.
     Returns the projected population of the calling object
     after the specified number of years.
    */
    public int predictPopulation
    (
        int years //in
    )
    {
		int result = 0;
        double populationAmount = population;
        int count = years;
        while ((count > 0) && (populationAmount > 0))
        {
            populationAmount = (populationAmount +
                (growthRate / 100) * populationAmount);
            count--;
        }
        if (populationAmount > 0)
            result = (int)populationAmount;
        return result;
    }

    public void setSpecies
    (
        String newName,      //in
        int newPopulation,   //in
        double newGrowthRate //in
    )
    {
        name = newName;
        if (newPopulation >= 0)
            population = newPopulation;
        else
        {
            System.out.println("ERROR: Using a negative population.");
            System.exit(0);
        }
        growthRate = newGrowthRate;
    }

    public String getName()
    {
        return name;
    }

    public int getPopulation()
    {
        return population;
    }

    public double getGrowthRate()
    {
        return growthRate;
    }

    public boolean equals(Species otherObject)
    {
        return (name.equalsIgnoreCase(otherObject.name)) &&
               (population == otherObject.population) &&
               (growthRate == otherObject.growthRate);
    }
}