java - 如何在更改另一个组合框项目选择后更改组合框的数据？

Question

我有一个用 java 编写的 MVC 应用程序，它有一个包含三个组合框的表单。年/月/日，如果年和月的选择发生变化，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 Controller 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);
    }
}}

如何在触发其他事件后更改另一个组件？

Answer 1

您可以更改依赖组合的模型，如本 example 所示.

或者，考虑 JCalendar .