刷新JComboBox [英] Refresh a JComboBox

问题描述

我有一个组合框，如您在从表中获取值的代码中所见. 因此，单击确定"后，表的值将更改. 如何在不关闭和打开jframe的情况下看到这些新值到compobox? 我今天对java.awt.EventQueue.invokeLater和其他人员进行了很多研究，但我无法使其正常工作，因为我对Java和常规编程是陌生的. 所以这是代码:

I have a combo box as you can see in the code that takes the values from a table. So after I click ok the values of the table change. How can I see these new values to the compobox without to close and open the jframe ? I made a lot of study today about java.awt.EventQueue.invokeLater and othe staff but I can not make it work, I am new to java and to programing general. So here is the code:

public class Compo extends JFrame implements ActionListener
{//start of class Compo 
//start of variables
private JComboBox<String> CompoBox;
private String array[];
private JButton okButton;
private JPanel panel;
//end of variables
public Compo ()
{//start of Compo method
  super("Example"); 
    panel=new JPanel(null);

   //table =  new String[3];
   array= new String[3];
   array[0]="alpha";
   array[1]="beta";
   array[2]="charlie";

   CompoBox= new JComboBox<>(array);
   CompoBox.setBounds(50, 70, 100, 20);
   panel.add(CompoBox);
   okButton=new JButton("ok");
   okButton.setBounds(50, 120, 70, 30);
   okButton.setActionCommand("ok");
   okButton.addActionListener(this);
   panel.add(okButton);
   add(panel);
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setSize(200, 200);
   setVisible(true);


}//end of compo method
@Override
public void actionPerformed(ActionEvent event)
    {//start of actionperformed
    String testString=event.getActionCommand();
    if (testString.equals("ok"))
    {//start of if
        for (int i = 0; i < array.length; i++)
        {
             String sample= array[i];
             array[i]=sample+"aa";

        }
    }//end of if
}//end of aciton performed


}//end of class Compo 

推荐答案

这应该是您正在寻找的答案，希望您会接受:

this should be the answer you are looking for, hope you'll accept it:

    if (testString.equals("ok")) {
        CompoBox.removeAllItems();
        for (int i = 0; i < array.length; i++) {
            String sample = array[i];
            CompoBox.addItem(sample + "aa");
        }
    }

顺便说一句.通用comqo-pox的操作如下:

btw. the generic comqo-pox is done like this:

CompoBox = new JComboBox<String>(array);

这篇关于刷新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！