String Array that contains String Arrays

Question

Hello and sorry for the noobish question. I have done a lot of search about my problem but i found nothing related to my problem.

So i have something like this:

public static String something [][] = 
{
    {"1","100"},
    {"2","1000"},
    {"3","10000"}
};

public static String somethingelse [][] = 
{
    {"1","100"},
    {"2","1000"},
    {"3","10000"}
};

public static String CATEGORIES[][][] = 
{
    something,
    somethingelse
};

How and if it is possible ofcourse can i return from the CATEGORIES[something].get(1st line) line?

I dont want to use something[0] I want to use something like this CATEGORIES.something[0] i dont know how else to explain it.

Thanks in advance!

If you tag the language, you might get help a little quicker. — John
– John, Commented Apr 9, 2016 at 21:51
Define a class with two fields: something and somethingElse. docs.oracle.com/javase/tutorial/java/javaOO — JB Nizet
– JB Nizet, Commented Apr 9, 2016 at 22:24

David Pérez Cabrera · Accepted Answer · 2016-04-09 22:29:37Z

1

You can (but it is an awful practice) with this:

public static class Categories {
    public String something [][] = {
        {"1","100"},
        {"2","1000"},
        {"3","10000"}
    };

    public String somethingelse [][] = {
        {"1","100"},
        {"2","1000"},
        {"3","10000"}
    };
}

public static final Categories CATEGORIES = new Categories();

answered Apr 9, 2016 at 22:29

David Pérez Cabrera

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8 Comments

Bálint Over a year ago

You create a new instance from a static class?

JB Nizet Over a year ago

What is awful is to make the fields public, not to create a class with fields holding state. The class itself could be private to make is less awful.

David Pérez Cabrera Over a year ago

@Bálint are you thinking in abstract class? It's a public nested static class. Of course you can create a new instance.

David Pérez Cabrera Over a year ago

@JBNizet can you call CATEGORIES.something[0] in other class?

JB Nizet Over a year ago

No, you can't. I made the incorrect assumption that the constant was private.

|

Bálint · Accepted Answer · 2016-04-09 22:30:35Z

1

You could use a HashMap with the key-value pairs as the name of the list and an arraylist like this:

HashMap<String, ArrayList<String>> c = new HashMap<>();
ArrayList<String> s = new ArrayList<>();
s.put("HI");
s.put("HELLO");
ArrayList<String> s2 = nee ArrayList<>();
s2.put("HI Again!");
s2.put("Hello Again");
c.put("something", s);
c.put("something2", s2);

Then you can access them as

c.get("something").get(0);

Note: Sorry for the inconvenient variable names, I'm on a phone.

answered Apr 9, 2016 at 22:30

Bálint

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3 Comments

HellDev Over a year ago

Thanks for your answer but it looks a bit confusing

Bálint Over a year ago

@HellDev check out oracle's tutorial on collections docs.oracle.com/javase/tutorial/collections

HellDev Over a year ago

Thanks for the explanation mate i will check your code tommorow to see if it does what i want and will reply you. Thanks again!

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