How do I add a class to an arraylist in processing?

Question

Whenever I try to add a country into my ArrayList<country> I keep on getting this error: unexpected token: ( and it highlights my countries.add line. I'm not sure why this is happening.

class country  {
    private int mland, mwaters; //mtotalborders;
    private String mcenter;

    country(int earth, int aqua, String yn)  {
        mland = earth;
        mwaters = aqua;
        mcenter = yn;
    }
    public int getLand()  {
        return mland;
    }
    public int getWaters()  {
        return mwaters;
    }
    public int getTotalBorders()  {
        return mland+mwaters;
    }
    public String getCenter()  {
        return mcenter;
    }
}

country Turkey = new country(16, 7, "No");
country France = new country(22, 4, "No");
country England = new country(17, 9, "No");
country Germany = new country(26, 4, "Yes");
country Austria = new country(28, 1, "Yes");
country Italy = new country(17, 8, "Yes");
country Russia = new country(23, 3, "No");
ArrayList<country> countries = new ArrayList<country>();
countries.add(Turkey);

Class names should start with a capital and objects shouldn't. Following code style helps you understand other code and helps others read yours. here's a guide :) — Martin
– Martin, Commented Jun 20, 2014 at 17:58
Class name must start with uppercase character, so, country should be named as Country. — Eder
– Eder, Commented Jun 20, 2014 at 17:58
So do I only capitalize the first country or every time? I capitalized every country and lowercased the country names and still got the same error. — Lufval
– Lufval, Commented Jun 20, 2014 at 18:04
Using a String with two values, "Yes" or "No", is a pretty bad idea. Consider using a boolean or perhaps an enum instead. This is not related to the problem you're having, though. — David Conrad
– David Conrad, Commented Jun 20, 2014 at 18:26

Andrew_CS · Accepted Answer · 2014-06-20 18:30:38Z

6

You need to put your code into a method - you probably want to use the main method - see below.

    ......

    public String getCenter()  {
        return mcenter;
    }

    public static void main(String[] args){
        country Turkey = new country(16, 7, "No");
        country France = new country(22, 4, "No");
        country England = new country(17, 9, "No");
        country Germany = new country(26, 4, "Yes");
        country Austria = new country(28, 1, "Yes");
        country Italy = new country(17, 8, "Yes");
        country Russia = new country(23, 3, "No");
        ArrayList<country> countries = new ArrayList<country>();
        countries.add(Turkey);
    }
}

Note: The proper convention is to capitalize Class names, and have variable names lowercase.

This will require you to change your Class name in your code - see below.

class Country  {
    private int mland, mwaters; //mtotalborders;
    private String mcenter;

    Country(int earth, int aqua, String yn)  {
        ......

Also anytime you reference the Class name. For example.

Country turkey = new Country(16, 7, "No");

edited Jun 20, 2014 at 18:30

answered Jun 20, 2014 at 18:00

Andrew_CS

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3 Comments

Alexis King Over a year ago

In Processing, these should actually probably be in a setup method, not a main function.

DanielG Over a year ago

As addition: you can also put the countries.add in an initializer block, if you want them to be added at start.

Andrew_CS Over a year ago

@JakeKing Given the nature of the question I'm operating under the assumption that this is an intro hw exercise so giving the basics here.

Jason Barrett · Accepted Answer · 2014-06-20 18:02:24Z

1

Lufval, you're trying to write code outside of a class definition. Global variable declarations are OK, executable statements are not.

answered Jun 20, 2014 at 18:02

Jason Barrett

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1 Comment

David Conrad Over a year ago

Java doesn't have global variables outside of classes. I think you mean trying to write code outside of a method.

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