Question

在我的程序中，我正在创建一个菜单，您可以在其中选择不同的菜肴。问题是，如果他们取消选择它仍然会被添加到总数中，并且在提交他们的选择之后我必须重新运行该程序以便选择新的选择。如何取消选中它是如此，在提交后仍然没有添加和刷新菜单？

这是我的听众，它处理何时选中复选框，另一个用于计算总数。

 private class SelectionListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent event) {
        if (edamame.isSelected()) {
            total1 = total1 + 4.99;
        } else if (calamari.isSelected()) {
            total1 = total1 + 8.99;
        } else if (shrimpTempura.isSelected()) {
            total1 = total1 + 8.99;
        } else if (tempuraCombo.isSelected()) {
            total1 = total1 + 9.99;
        } else if (gyoza.isSelected()) {
            total1 = total1 + 3.99;
        } else if (pepsi.isSelected()) {
            total2 = total2 + 2.99;
        } else if (sprite.isSelected()) {
            total2 = total2 + 2.99;
        } else if (mtDew.isSelected()) {
            total2 = total2 + 2.99;
        } else if (drPepper.isSelected()) {
            total2 = total2 + 2.99;
        } else if (budlight.isSelected()) {
            total2 = total2 + 4.99;
        } else if (budweiser.isSelected()) {
            total2 = total2 + 4.99;
        } else if (playboy.isSelected()) {
            total3 = total3 + 12.99;
        } else if (california.isSelected()) {
            total3 = total3 + 3.99;
        } else if (volcano.isSelected()) {
            total3 = total3 + 13.99;
        } else if (goldenCali.isSelected()) {
            total3 = total3 + 7.99;
        } else if (shrimpTemp.isSelected()) {
            total3 = total3 + 6.99;
        } else if (tunaR.isSelected()) {
            total3 = total3 + 5.99;
        } else if (avocadoR.isSelected()) {
            total3 = total3 + 4.99;
        } else if (spicyCaliR.isSelected()) {
            total3 = total3 + 5.99;
        } else if (salmonR.isSelected()) {
            total3 = total3 + 5.99;
        } else if (crab.isSelected()) {
            total4 = total4 + 3.99;
        } else if (salmon.isSelected()) {
            total4 = total4 + 3.99;
        } else if (tuna.isSelected()) {
            total4 = total4 + 3.99;
        } else if (whiteT.isSelected()) {
            total4 = total4 + 3.99;
        } else if (eel.isSelected()) {
            total4 = total4 + 3.99;
        } else if (crabstick.isSelected()) {
            total4 = total4 + 3.99;
        } else if (lobster.isSelected()) {
            total4 = total4 + 3.99;
        } else if (bulgogi.isSelected()) {
            total5 = total5 + 18.99;
        } else if (kimchiJi.isSelected()) {
            total5 = total5 + 12.99;
        } else if (kalbee.isSelected()) {
            total5 = total5 + 24.99;
        } else if (soonTofu.isSelected()) {
            total5 = total5 + 11.99;
        } else if (bimbimap.isSelected()) {
            total5 = total5 + 10.99;
        } else if (dolSot.isSelected()) {
            total5 = total5 + 12.99;
        } else if (dukMan.isSelected()) {
            total5 = total5 + 13.99;
        } else if (nakJi.isSelected()) {
            total5 = total5 + 16.99;
        } else if (tempuraU.isSelected()) {
            total5 = total5 + 12.99;
        } else if (nabeyaki.isSelected()) {
            total5 = total5 + 13.99;
        } else if (kalbeeTang.isSelected()) {
            total5 = total5 + 14.99;
        }
    }
}


 private class TotalListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent event) {
        NumberFormat desiredlook = NumberFormat.getCurrencyInstance();
        desiredlook.setMaximumFractionDigits(2);
        desiredlook.setMinimumFractionDigits(2);
        name = getName.getText();
        total = (total1 + total2 + total3 + total4 + total5) * 1.065;
        labelTotal.setText(name + " your total is "
                + desiredlook.format(total));

    }
}

Answer 1

试试这个java代码：

YourCheckBox.setSelected (boolean isSelected);

Answer 2

您的SelectionListener表示每个JCheckBox都使用了一个侦听器。这会产生每个复选框的点击操作与交叉相关并且难以管理的问题。

为了避免这种交叉依赖，您可以为每个组件创建单独的ActionListeners。 Action接口可用于创建多个具体操作，从而可以将要添加的值传递到其实现的构造函数中。例如

class SelectionListener extends AbstractAction { 

    private final double amount;
    public SelectionListener(double amount) {
        this.amount = amount;
    }

    @Override
    public void actionPerformed(ActionEvent event) {
        JCheckBox checkBox = (JCheckBox)event.getSource();
        if (checkBox.isSelected()) {
            total1 += amount;
        }
    }
}

如何在提交后取消选中所有复选框？

2 个答案: