JCombobox和JTextfield

Question

I'm trying to work to display a number of jtextfield according to one of the given values in a combobox.

So, I will have a drop down menu with let's say 1 to 4. If the user selects number 3, 3 textfields will be displayed. I've created the jcombobox with a selection of numbers. But I'm not sure how to implement this. If I'm not mistaken I need to use

ItemEvent.SELECTED

I think I need to create a reference to the JTextField object that will be available to the JComboBox's itemListener object.

Any help would be greatly appreciated.

I've added this to my class :

// aOption is the combobox I declared 
aOptionComboBox.setModel(new DefaultComboBoxModel(new String[]{"1","2","3"})); 

public void itemStateChanged(ItemEvent event) {

    String num = (String)aOptionComboBox.getSelectedItem(); 
    int num1 = Integer.parseInt(num);
    JTextField[] textfields = new JTextField[num1];

    for (int i = 0; i < num1; i++) 
    {
        textfields[i] = new JTextField("Field");
        getContentPane().add(textfields[i]);
        textfields[i].setBounds(200, 90, 100, 25);

    }
}

am I on a right track?

Answer 1

use the getSelectedItem() on the combobox. This will either yield a string or an integer (depending on how you implemented it). Next use a for-loop to determine the amount of JTextField's and store them in an array.

int amount = myJComboBox.getSelectedItem();

JTextField[] textfields = new JTextField[amount];

for (int i = 0; i < amount; i++) {
textfields[i] = new JTextField("awesome");
this.add(textfields[i]);
}

this way you can easily store the textfields and add them to your panel.

Some added information.

The textfield-array must be accesible outside the eventListener, so you must implement it in your class. that way the whole class can use it.