java - JComboBox不显示更新的模型，如何刷新组合框

Question

JCombo 框不显示 arraylist 的更新值，当我打印数组时，它显示它已使用添加的新值进行更新，我已使用 DefaultComboBoxModel 添加数组

请帮助我如何将更改后的内容触发到 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);
}

Answer 1

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");
 } 
});