Declaring an array of array using Objects

Question

I'm trying to construct an array of array using Objects. I created the Object Block which contains multiple variables in it. I wrote:

Block[][] block = new Block[4][4];

Now I am having an error when I insert:

block[1][1] = new Block(); // As what I've understood, we still need 
                           // to create the object inside this specific block[][]

The error message is:

Cannot find symbol, ']' expected and Invalid method declaration, return type required

Please post a short but complete program demonstrating the problem. — Jon Skeet
– Jon Skeet, Commented Aug 22, 2012 at 7:40
What's the error message? Noone can help you if you don't provide all the information that you can provide, wether or not it seems important to you. — F.P
– F.P, Commented Aug 22, 2012 at 7:41
To "improve" @hmjd's question: Does Block have visible parameterless constructor? — amit
– amit, Commented Aug 22, 2012 at 7:46

swemon · Accepted Answer · 2012-08-22 08:04:07Z

4

It works for me

public class testProgram {

    public static void main(String args[]) {
        Block[][] block = new Block[4][4];
        block[1][1] = new Block();
        block[1][1].setName("Block 1 1");
        System.out.println(block[1][1].getName());

        block[1][2] = new Block();
        block[1][2].setName("Block 1 2");
        System.out.println(block[1][2].getName());
    }

    public static class Block {

        private String name;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }
}

edited Aug 22, 2012 at 8:04

answered Aug 22, 2012 at 7:46

swemon

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8 Comments

NewbieLearner Over a year ago

I have a question. I tied this, and it's working. I placed this in my Main page. I think I'm noticing something, the error occured when I placed this syntax in another class. Is there a reason for that?

amit Over a year ago

@JonaziAlmocera: Hard to tell without the real code - but if Block is an innder class - it probably has something to do with needing an enclosing instance. Declare Block as public static class Block { ... } instead of public class Block { ... } (Note the difference is the static keyword)

swemon Over a year ago

I am not clear what your mean. I test these code in two different classes.

Fabian Barney Over a year ago

@JonaziAlmocera Go and provide us the error message you get. Then we can tell you what's your problem instead of making blind guesses.

NewbieLearner Over a year ago

I appreciate your help! (I didn't test yet the public static class Block, but I was thinking to use that) By the way, here is the actual code: In my Main: public static void main(String[] args) { // TODO code application logic here Block[][] block = new Block[4][4]; block[1][1] = new Block(); block[1][2] = new Block(); } and it works perfectly fine.. Continuation... (Sorry, I'm a newbie here at stack overflow)

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