Calling a method in main class from non main class

Question

I have two Java classes:

BoardManager & Board

BoardManager is the main class. Inside it contains a board:

    public BoardManager(){
        Board b = new Board();
    }

    public methodToBeCalled(){}

    public static void main(String[] args) {
        new BoardManager();
    }

Board is the user interface. When a user presses a button on the interface I want it to then call a method in the BoardManager class, but that obviously presents a problem and I am unsure how to get around it.

One solution was to move the main method into Board and so this:

BoardManager boardManager;

    public Board(){}

    public void buttonPressed(){
        boardManager.methodToCall();
    }

    public static void main(String[] args) {
        boardManager = new BoardManager();
    }

But that just throw up errors about static and unstatic etc.

Solutions? Thanks!

Answer 1

Either this:

class Board{
static BoardManager boardManager;

public Board(){}

public void buttonPressed(){
    boardManager.methodToCall();
}

public static void main(String[] args) {
    boardManager = new BoardManager();
}
}

Or this:

class Board {
BoardManager boardManager;

public Board(){ }

public void buttonPressed(){
    boardManager.methodToCall();
}

public static void main(String[] args) {
    Board b = new Board();
    b.boardManager = new BoardManager();
}
}

You can't call a non-static field(BoardManager) from a static method (main). Read more about the static keyword.