Reference object instance inside of another object

Question

I have the following code at the end of my main class to initialize objects and start the program:

HumanPlayer humanPlayer = new HumanPlayer(baseHold);
Controller controller = new Controller(new ComputerPlayer(), humanPlayer, new Dice(seed));
controller.start();

Inside my Controller class, is the following code:

public class Controller
{
    int roller;
    public Controller(ComputerPlayer cpuPlayer, HumanPlayer userPlayer, Dice dice)
    {
    }
//....
}

I am unsure what to initialize above, as I've tried a few things already and it still does not find my object dice in the following code:

public void start()
{
    for (int count = 0; count < 5; count++)
    {
        roller = dice.roll();
        System.out.println("Die roll: " + roller);
    }
}

roll is a method within the Dice class. Is there a particular way for me to tell it to look for dice as an object within my controller object instead of a variable within my controller object, or am I going about this completely wrong?

I want to be able to roll the die 5 times here.

error:

Controller.java:39: error: cannot find symbol
                roller = dice.roll();
                         ^
symbol:   variable dice
location: class Controller    
1 error

Just a heads up (not sure if this is the case with your actual code) you have a comma missing between humanPlayer and new Dice(seed) when you create an instance of Controller. — Bono
– Bono, Commented Feb 19, 2015 at 22:22

Anderson Vieira · Accepted Answer · 2015-04-22 11:35:41Z

1

You have to declare dice as an instance field of Controller, like this:

public class Controller {
    private Dice dice;
    // rest of the class code
}

Then in the constructor you will do:

public Controller(ComputerPlayer cpuPlayer, HumanPlayer userPlayer, Dice dice) {
    // some other code
    this.dice = dice;
}

Then you can use this.dice in the other methods inside the Controller class.

edited Apr 22, 2015 at 11:35

answered Feb 19, 2015 at 22:22

Anderson Vieira

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1 Comment

nmvision Over a year ago

This was my problem. This has fixed it, thank you. Someone with reputation please upvote.

Alexandre Santos · Accepted Answer · 2015-02-19 22:22:47Z

0

HumanPlayer humanPlayer = new HumanPlayer(baseHold);
Controller controller = new Controller(new ComputerPlayer(), humanPlayer new Dice(seed));
controller.start();

You need a comma between humanPlayer and new Dice(seed)

HumanPlayer humanPlayer = new HumanPlayer(baseHold);
Controller controller = new Controller(new ComputerPlayer(), humanPlayer, new Dice(seed));
controller.start();

answered Feb 19, 2015 at 22:22

Alexandre Santos

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1 Comment

nmvision Over a year ago

Fixed the original code to reflect this. Same error.

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