public class Gamefield {
    private int field1 = 0, field2 = 0, field3 = 0, field4 = 0, field5 = 0, field6 = 0, field7 = 0, field8 = 0, field9 = 0;

    /**
     * Constructor of class Gamefield
     */
    Gamefield() {}

    /**
     * Method to set a field when it is set from player
     * @param field the field which should be set. (1-9)
     * @param player the player who sets the field (1 or 2)
     * @return true --> field is set, false --> field isn't set because it's already set or it doesn't exist.
     */
    public boolean setField(int field, int player) {
        if(field == 1 && field1 == 0) {
            field1 = player;
        }
        else if(field == 2 && field2 == 0) {
            field2 = player;
        }
        else if(field == 3 && field3 == 0) {
            field3 = player;
        }
        else if(field == 4 && field4 == 0) {
            field4 = player;
        }
        else if(field == 5 && field5 == 0) {
            field5 = player;
        }
        else if(field == 6 && field6 == 0) {
            field6 = player;
        }
        else if(field == 7 && field7 == 0) {
            field7 = player;
        }
        else if(field == 8 && field8 == 0) {
            field8 = player;
        }
        else if(field == 9 && field9 == 0) {
            field9 = player;
        }
        else {
            return false; //if field is already set or it doesn't exist.
        }
        return true; //if change is done
    }


    /**
     *
     * @param field the number of the requested field
     * @return integer of the player, which has set the requested field (1 -> Player 1, 2 -> Player 2, -1 --> the requested field doens't exist.)
     */
    public int getField(int field) {
        if(field == 1) {
            return field1;
        }
        else if(field == 2) {
            return field2;
        }
        else if(field == 3) {
            return field3;
        }
        else if(field == 4) {
            return field4;
        }
        else if(field == 5) {
            return field5;
        }
        else if(field == 6) {
            return field6;
        }
        else if(field == 7) {
            return field7;
        }
        else if(field == 8) {
            return field8;
        }
        else if(field == 9) {
            return field9;
        }
        return -1; //if the requested field doesn't exist, -1 will be returned.
    }

    /**
     * Method to print field
     */
    public void outputField() {
        System.out.println(getSymbol(field1) + "|" + getSymbol(field2) + "|" + getSymbol(field3));
        System.out.println("-----");
        System.out.println(getSymbol(field4) + "|" + getSymbol(field5) + "|" + getSymbol(field6));
        System.out.println("-----");
        System.out.println(getSymbol(field7) + "|" + getSymbol(field8) + "|" + getSymbol(field9));
    }

    /**
     *
     * @param player number of player who has set the field (1 or 2)
     * @return the Symbol of the player who has set the field (X or O)
     */
    private String getSymbol(int player) {
        if(player == 1) {
            return "X";
        }
        else if(player == 2) {
            return "O";
        }
        else {
            return " ";
        }
    }

}