CODEWITHSUNDEEP
javaarraysincrement
user4412408
user4412408

Reputation:

Filling array with next empty space?

Here are my two classes Country and Countries. I am doing questions from online as extra practice.

I need to: -Add a method to Countries - addCountry(String name, String capital, int population - Which fills in the element by nextFreeCountry and increments nextFreeCountry

Can somebody provide some help? I am struggling to understand how to fill in the element by nextFreeCountry.

Country:

public class Country {

    private String name;
    private String capital;
    private int population;

Constructor to add the name capital and population

    public Country(String name, String capital, int population) {
        this.name = name;
        this.capital = capital;
        this.population = population;
    }

Get name method

    public String getName() {
        return name;
    }


    public String getCapital() {
        return capital;
    }

    public int getPopulation() {
        return population;
    }

    public String toString() {
        return "Name = " + getName() + " Capital = " + getCapital() + " Population = " + getPopulation();
    }
}

Countries:

class Countries {

Creating an array of Country called countries

    private Country[] countries;
    private int nextFreeCountry = 0;

Setting the size for the array

    public Countries(int size) {
        countries = new Country[size];
    }

addCountry method

    public void addCountry(String name, String capital, int population) {
        countries[nextFreeCountry] = 
        nextFreeCountry++;
    }

}

Upvotes: 0

Views: 1800

Answers (2)

Brandon
Brandon

Reputation: 317

You have to add a new country to the array which you are not doing at the moment. Like so:

public void addCountry(String name, String capital, int population) {
        countries[nextFreeCountry] = new Country(name, capital, population);
        nextFreeCountry++;
}

Alternatively just pass a Country to the method like this:

public void addCountry(Country country) {
            countries[nextFreeCountry] = country;
            nextFreeCountry++;
}

You may also be better off using an ArrayList rather than an array so you dont have to worry about the array index being out of bounds etc.

Upvotes: 1

Juned Ahsan
Juned Ahsan

Reputation: 68715

As countries array hold Country objects, so create a new object and put it in array. Something like this:

public void addCountry(String name, String capital, int population) {
    countries[nextFreeCountry] = new Country(name,capital,population);
    nextFreeCountry++;
}

Upvotes: 2

Related Questions