Java swing:实现我的Comboboxmodel for JComboBox [英] Java swing: implementing my Comboboxmodel for JComboBox

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问题描述

我需要我的组合框有短名称的组织。问题是我可以在下拉列表中查看单位名称,但不能实际选择它。我的错误在哪里?

I need my combo box to have short names of organizations. The problem is i can see organizations names in dropdown list, but cant actually select it. Where is my mistake?

public class ToComboBoxModel extends AbstractListModel implements ComboBoxModel {
      private String selectedItem;

      private List<Organization> orgs;

      public ToComboBoxModel(List orgs) {
        this.orgs = orgs;
      }

        @Override
      public String getSelectedItem() {

        return selectedItem;
      }

        @Override
      public void setSelectedItem(Object newValue) {
            for (Organization o: orgs){
                if (newValue==o){
                    selectedItem=o.getShortName();
                    break;
                }
            }
      }

        @Override
      public int getSize() {
        return orgs.size();
      }

        @Override
      public String getElementAt(int i) {
        return orgs.get(i).getShortName();
      }
    }

设置型号:

query =session.createQuery("from Organization where isMain = 0");
List orgs=query.list();
toComboBox.setModel(new ToComboBoxModel(orgs));

提前感谢!

推荐答案

我怀疑你的 setSelectedItem()方法使用 == .equals()

I suspect it's that your setSelectedItem() method compares objects using == rather than .equals()

请考虑使用 DefaultComboBoxModel 已经实现了有用的方法。

Consider using a DefaultComboBoxModel which already implements useful methods.

Edit
此外,根据文档,当调用setSelected时,您应该调用所有注册的 ListDataListener 对象。

使用 DefaultComboBoxModel 是相当简单的。您创建一个新的 DefaultComboBoxModel 添加您要包含的元素,然后调用 getSelectedItem()目前已选择。

Using a DefaultComboBoxModel is fairly straightforward. You create a new DefaultComboBoxModel add the elements you want it to contain then call getSelectedItem() to retrieve the element that is currently selected.

这篇关于Java swing:实现我的Comboboxmodel for JComboBox的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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