无法将选定的复选框保存到变量

Question

我对javafx有问题。我有大约40个复选框的GridPane。我需要让用户只能选择一个复选框，并将选中的复选框保存到变量中。

这是使用复选框的方法：

    public static class createBet {
        public static CheckBox bet;

        public static CheckBox isBet(CheckBox[] group, int finalI, AnchorPane resultBlock) {
            for (CheckBox j : group) {
                if (j.equals(bet)) {
                    j.setSelected(false);
                }
            }
            ObservableList resultLabels = resultBlock.getChildren();
            Label label_num = (Label)resultLabels.get(0);
            Label label_win = (Label)resultLabels.get(1);

            if (group[finalI].isSelected()) {
                bet = group[finalI];
                resultBlock.setStyle("-fx-border-color: black;");
                label_num.setStyle("-fx-text-fill: black");
                label_win.setStyle("-fx-text-fill: black");
            }
            else {
                bet = null;
                resultBlock.setStyle("-fx-border-color: gray");
                label_num.setStyle("-fx-text-fill: gray");
                label_win.setStyle("-fx-text-fill: gray");
            }

            return bet;
        }
    }

这是一个最终变量类：

    public class bets {
        public CheckBox numberBet = null;
        public CheckBox colorBet = null;
        public CheckBox evenBet = null;
    }

在那里我使用这些类：

       //(block with variables and links to FXML)

        createBet bet = new createBet();
        bets bets = new bets();

        for (int i = 0; i < numbersGroup.length; i++) {
            int finalI = i;
            numbersGroup[i].selectedProperty().addListener(new ChangeListener<Boolean>() {
                @Override
                public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                    bets.numberBet = createBet.isBet(numbersGroup, finalI, resultNum);
                }
            });

        }

    }
}

复选框选择正确，但所选复选框（类下注）的变量始终等于null。

UPD。我注释类createBet，并将其中的代码添加到公共void changed（observeValue

Answer 1

我对这个问题的解决方案。我不使用方法isBet设置varbable<代码>isBet仅用于更改复选框和激活块的结果。我在内部操作中设置的变量，其中使用了thei。

类的新版本：

public class Bet {
        private CheckBox bet;

        public void forBet(CheckBox[] group, int finalI, AnchorPane resultBlock) {
            for (CheckBox j : group) {
                if (j.equals(bet)) {
                    j.setSelected(false);
                }
            }
            ObservableList resultLabels = resultBlock.getChildren();
            Label label_num = (Label)resultLabels.get(0);
            Label label_win = (Label)resultLabels.get(1);

            if (group[finalI].isSelected()) {
                bet = group[finalI];
                resultBlock.setStyle("-fx-border-color: black;");
                label_num.setStyle("-fx-text-fill: black");
                label_win.setStyle("-fx-text-fill: black");
            }
            else {
                bet = null;
                resultBlock.setStyle("-fx-border-color: gray");
                label_num.setStyle("-fx-text-fill: gray");
                label_win.setStyle("-fx-text-fill: gray");
            }
        }

        public CheckBox startBet(CheckBox[] group) {
            for (CheckBox i : group){
                if (i.isSelected()) {
                    bet = i;
                    break;
                }
            }
            return bet;
        }
    }

变量：

public CheckBox numberBet = null;
public CheckBox colorBet = null;
public CheckBox evenBet = null;

用于方法：

        Bet Bet = new Bet();

        for (int i = 0; i < numbersGroup.length; i++) {
            int finalI = i;
            numbersGroup[i].selectedProperty().addListener(new ChangeListener<Boolean>() {
                @Override
                public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                    Bet.forBet(numbersGroup, finalI,resultNum);
                }
            });
        }

        btn_start.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                numberBet = Bet.startBet(numbersGroup);
                System.out.println(numberBet);
            }
        });

我想，这是解决我的问题。