java - trying to call a class but it gives me errors: actual and formal argument lists differ in length

Question

I created a class called PlacePiece which will be called in the Game class. but when I call it in Game Class it gives me the error:

actual and formal argument lists differ in length.

how do I fix it and what's causing it? I do not know how to fix it and been trying to solve it for eternity. I'm also new to coding so any feedback can help

public class Game {
    private Board gBoard;
    private PlacePiece placePiece; 

    public Game() {
        gBoard = new Board();
        PlacePiece.placePiece();
   }
}


import java.util.Scanner;

public class PlacePiece {

    public void placePiece(char[][] gBoard) {

        System.out.print("Game has begun, please enter where you would like to place (1~9):");
        Scanner scan = new Scanner(System.in);
        int placement = scan.nextInt();
  
        System.out.println(placement);       

        char piece = ' ';              
        switch(placement){
            case 1: gBoard[0][0] = piece;
                break;
            case 2: gBoard[0][2] = piece;
                break;
            case 3: gBoard[0][4] = piece;
                break;
            case 4: gBoard[2][0] = piece;
                break;
            case 5: gBoard[2][2] = piece;
                break;
            case 6: gBoard[2][4] = piece;
                break;
            case 7: gBoard[3][0] = piece;
                break;
            case 8: gBoard[3][2] = piece;
                break;
            case 9: gBoard[3][4] = piece;
                break;
        }  
        for(char[] row : gBoard){
            for(char c : row){
                System.out.print(c);
            }
            System.out.println();
        }
    }
}

question from:https://stackoverflow.com/questions/65926265/trying-to-call-a-class-but-it-gives-me-errors-actual-and-formal-argument-lists

Answer 1

You haven't actually initialized any PlacePiece variable and your method isn't static, so how do you want to call it? Also in your placePiece function you should pass char[][] gBoard, that you aren't passing.

My guess is that you are trying to make a game and don't know how, sou you just copied some function from internet without knowing the function.

So, in your Board class I bet that you have something like this:

public class Board {
    private char[][] board; // you should initialize it in constructor

    public char[][] getBoard() {
        return board;
    }
}

Then you should create your placePiece variable in Game class and use it:

public class Game {
    private Board gBoard;
    private PlacePiece placePiece; 

    public Game() {
        gBoard = new Board();
        placePiece = new PlacePiece();
        placePiece.placePiece(gBoard.getBoard()); // you have to pass variable to placePiece() function
    }
}

I don't think you know, what you're doing otherwise you wouldn't have made these mistakes, so I highly recommend you taking some Java tutorial, so you have some foundation and then start doing more complex tasks.