java - JCombo Box不显示更新的模型，如何刷新组合框

JCombo框不显示arraylist的更新值，当我打印数组时，它显示它使用添加的新值进行更新，我使用DefaultComboBoxModel添加了数组

请帮助我如何将更改的内容触发到UI

JComboBox comboBox_CHR = new JComboBox();
File CHRXml = new File("CHR.xml");
ArrayList<String> chrNo = xml.readChrNum(CHRXml);
DefaultComboBoxModel model=new DefaultComboBoxModel(chrNo.toArray());

public MainPage()
{
  ArrayList<String> chrNo = xml.readChrNum(CHRXml);
  chrNo = xml.readChrNum(CHRXml);
  model=new DefaultComboBoxModel(chrNo.toArray());
  System.out.println(chrNo);
  comboBox_CHR.setModel(model);
  comboBox_CHR.setModel(model);
  comboBox_CHR.setBackground(new Color(176, 196, 222));
  comboBox_CHR.setBounds(105, 50, 348, 30);
  panel_Chr.add(comboBox_CHR);
}

最佳答案

当我在EDT上进行更新时，它终于起作用了

addComponentListener(new ComponentAdapter()
{
@Override
public void componentShown(ComponentEvent arg0)
 {
if(CHRXml.exists())
{
ArrayList<String> chrNo = xml.readChrNum(CHRXml);
 chrNo = xml.readChrNum(CHRXml);
comboBox_CHR.setModel(new DefaultComboBoxModel(chrNo.toArray()));
}
else
JOptionPane.showMessageDialog(null,"CHR database file doesnot exists");
 }
});