Greenfoot

Astralman

2018/5/13

#

Not sure if "reference" is the right word. Let me explain. If I made a method that randomly flips a quarter (heads or tails), then made this

public Coin(){
       toss();
    }

Then I created an object - something like this:

public static void main (String[] args){
Coin quarter= new Coin();
}

I know I could just say quarter.toss(); and it flips the quarter. But what if I made an array?

String coinName[] = {"quarter"};

OR

double coin [] = new double [1];
coin [0] = 0.25;

How can I reference the number of the array with the toss constructor, like how I did with quarter.toss()? I was trying indexOf but it's not working. I hope that makes sense.

danpost

2018/5/13

#

What is your toss method? I really do not see any place where there are two options (one for heads and one for tails).

Astralman

2018/5/13

#

Oh, I didn't think it was important. I thought it was simple question.

public class Coin{

	private String sideUp;

    public void toss(){

        Random random = new Random();

        int randomNumber;

        randomNumber = random.nextInt(2);
        if (randomNumber == 1){
            sideUp = "tails";
        }
        else{
            sideUp = "heads";
        }
	}

    public String getSideUp(){
        return sideUp;
	}

    public Coin(){
       toss();
    }

danpost

2018/5/13

#

Astralman wrote...

Oh, I didn't think it was important. I thought it was simple question. << Code Omitted >>

It was needed for context. Did you try something like:

Coin[] coins;

for an array? If you wanted each coin to have a denomination, it should probably be held by the Coin objects themselves in a String or a float field (with another "getter" method for its value).

Astralman

2018/5/13

#

I tried this:

Coin coinName [] = new Coin[1];
	coinName [0] = "quarter";

Is this okay? But how I get it to reference with toss()?

Astralman

2018/5/13

#

Is a getter, like an accessor? But wouldn't that be different from an array? Or can I put the array inside getter?

danpost

2018/5/13

#

Astralman wrote...

Is a getter, like an accessor? But wouldn't that be different from an array? Or can I put the array inside getter?

The getSideUp method in the Coin class is an example of a "getter" method. I was suggesting a similar method to return the type of coin, which would be held in another field (similar to line 3 in the Coin class given above). The array, on the other hand will be far removed from it -- in a different class altogether.

Astralman

2018/5/15

#

Got it. Thanks!

Activity

About

Documentation

Download

Discuss

Scenarios

How do I reference an array?