在组合框中创建选项作为可用串行端口

Question

So, I'm confused as to how to change the options in a combo box based off of the available serial ports. Could anyone please help me figure this out? I think I need to use javax.swing.getModel, but I'm unsure as to how to do that.

  if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
        ArrayList<String> serialports = new ArrayList<String>();
        serialports.add(portId.getName());
        String[] ports = new String[serialports.size()];
        ports = serialports.toArray(ports); 
        GUI.jComboBox2 = new JComboBox(ports);
        GUI.jComboBox2.addActionListener(GUI.jComboBox2);
        wantedPortName = (String) GUI.jComboBox2.getSelectedItem();

Answer 1

There are two issues...because of the lack of context, it's difficult to know which one is correct

Possibility #1

You've previously created the combo box and added it to the screen....

If this is the case, then your code has just de-referenced it. Meaning that the control that is on the screen is no longer the one you are interacting with.

In this case, you should update the model only...

ArrayList<String> serialports = new ArrayList<String>();
serialports.add(portId.getName());
String[] ports = new String[serialports.size()];
ports = serialports.toArray(ports); 
ComboBoxModel<String> model = new DefaultComboBoxModel<>(ports);
GUI.jComboBox2.setModel(model);

Possibility #2

You've never added the combo box to the screen before...

In which case, you should...but there's not enough context to describe how you would achieve that with your code...

Possibility #3

I have no idea what you're talking about...