JComboBoxes的ArrayList导致JComboBoxes彼此锁定

Question

This is the problem I'm having: I have an ArrayList of 5 JComboBox 's. These JComboBox 's each contain the same five options: "1", "2", "3", "4", and "5" . I then add the ArrayList of JComboBox 's to a JFrame via a for loop. However, for some odd reason, whenever I select an option in one of the JComboBox 's, the rest of the JComboBox 's also select that reason. This first screenshot is of the JFrame in its state when first executed :

This is a screenshot of the user selecting another menu item:

And this third screenshot shows that ALL the JComboBox 's changed to the selected input.

This is my code:

class Foo {
    JFrame frame = new JFrame("Add person(s)");
    ArrayList<JComboBox> comboArray = new ArrayList<JComboBox>();

    String[] floors = {"1", "2", "3", "4", "5"};
    DefaultComboBoxModel<String> model = new DefaultComboBoxModel<String>(floors);

public void go() {
    for (int x = 0; x < 5; x++) {
        comboArray.add(new JComboBox<String>(model)); //Adds numbers 1-5 to a new JComboBox, and the JComboBox is then added to comboArray
        frame.add(comboArray.get(x)); //Adds each JComboBox to the frame
    }
    frame.setResizable(false);   
    ...
    frame.setVisible(true);
}

public static void main (String [] args) {
    go();
}

}

Answer 1

comboArray.add(new JComboBox<String>(model)); 

You are adding the same ComboBoxModel to each combo box.

You need to create a separate model for each combo box.

So the code inside the loop should be:

DefaultComboBoxModel<String> model = new DefaultComboBoxModel<String>(floors);
comboArray.add(new JComboBox<String>(model)); 

Now each combo box contains a separate model, but each model contains the same values.