AutoCompleteDecorator正在中断ItemListener [英] AutoCompleteDecorator is interrupting ItemListener

问题描述

我有一个与 AutoCompleteDecorator 集成的可编辑 JComboBox $ c> of SwingX 库。我的 JComboBox 也有一个 ItemListener 注册。现在，请查看下面的代码。

I have an editable JComboBox which is integrated with the AutoCompleteDecorator of SwingX library. My JComboBox is also having an ItemListener registered to it as well. Now, Please have a look at the below code.

AutoCompleteDecorator.decorate(ClientNameCombo);
ClientNameCombo.addItemListener(new ClientNameComboAction());

private class ClientNameComboAction implements ItemListener
     {

        @Override
        public void itemStateChanged(ItemEvent e) 
        {
            String selectedClientName= ClientNameCombo.getSelectedItem().toString();


            if(!selectedClientName.equals("Select Client"))
            {
                int idClient = Integer.parseInt(String.valueOf(client_name_id_map.get(selectedClientName)));

                String sql = "r";


            }
        }
     }

无论什么，我的代码不通过 int idClient = Integer.parseInt（String.valueOf（client_name_id_map.get（selectedClientName）））; code> NumberFormatException 。惊人的是，如果我删除 AutoCompleteDecorator ，那么一切都很好。

No matter what, my code do not pass int idClient = Integer.parseInt(String.valueOf(client_name_id_map.get(selectedClientName))); it always ended up with NumberFormatException. The amazing thing is, if I remove AutoCompleteDecorator then everything works fine.

任何人知道如何解决这个问题？

Anyone know how to fix this please?

推荐答案

当您在地图中找不到要寻找的键时会出现问题。

The problem would occur when the key you are looking for is not found in the map.

在这种情况下：

• client_name_id_map.get（selectedClientName）将返回null


• String.valueOf（client_name_id_map.get（selectedClientName））
  
• 和 Integer.parseInt（null）会抛出异常

• client_name_id_map.get(selectedClientName) would return null
• String.valueOf(client_name_id_map.get(selectedClientName)) would return "null"
• and Integer.parseInt("null") would throw an exception

一个简单的解决方案：

        if(!selectedClientName.equals("Select Client"))
        {
            Integer idClient = client_name_id_map.get(selectedClientName);
            if (idClient != null) {
                // do something
            }

            String sql = "r";
        }

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