java-在更改另一个组合框项目选择后如何更改组合框的数据？

我有一个用Java编写的MVC应用程序,该应用程序具有一个带有三个组合框的形式.
年/月/日,如果更改了年和月的选择,我想更改天数.
在我的查看器中,我只定义了组合框

createComboBoxes( mainContentPage, "combobox name");

在我的控制器中,我有：

public class ComboBoxItemListener implements ItemListener
{

private int year=0;
private int month=0;
private int day=0;

public WeatherController c_wc;
@Override
public void itemStateChanged(ItemEvent event)
{


    JComboBox comboBox = (JComboBox)event.getSource();
    if (event.getStateChange() == ItemEvent.SELECTED)
    {
                    //this area is my problem
        if(comboBox.getName() == Helper.COMBOBOX_MONTH || comboBox.getName() == Helper.COMBOBOX_YEAR)
        {
                    //definitely this line is not correct
                c_wc.addDaysToComboBox(comboBox, year, month);
                comboBox.setEnabled(true);


        }
        //rest is okay
        switch(comboBox.getName())
        {
            case Helper.COMBOBOX_YEAR:
                year = Integer.parseInt(comboBox.getSelectedItem().toString().trim());

                break;

            case Helper.COMBOBOX_MONTH:
                KeyValue<String, Integer> selectedItem = (KeyValue<String,Integer>)event.getItem();

                month = Integer.parseInt(selectedItem.getValue().toString());
                break;

            case Helper.COMBOBOX_DAY:
                day = Integer.parseInt(comboBox.getSelectedItem().toString().trim());
                break;

            case Helper.COMBOBOX_AIRPORT:
                break;
        }
        System.out.println(year + " " + month + " " + day);
    }
}}

触发其他事件后如何更改另一个组件？

解决方法:

您可以更改从属组合的模型,如此example所示.

或者,考虑JCalendar.

标签：jcombobox,event-handling,swing,comboboxmodel,java
来源： https://codeday.me/bug/20191101/1986853.html