jcombobox

问题 A person wishes to add a NEW Job to the database. A Combobox list the existing employers already in the database for the new Job to be added against. But if an employer is not present customers have the option click on a button to add an employer. Once added that employer should immediately be displayed in the textfield. I am trying to achieve the above scenario with my coding and mysql database, but cant think of the logic to do so... Table Employer CREATE TABLE "Employer" ("employerID"

问题 I believe it's possible to create submenus under JComboBoxes by creating a JMenu for the elements and so on, which in essence basically means creating your own custom component. I also looked at a few examples and it's pretty complex and most seem to have some kind of issue or other. So basically my question is it possible to somehow in a fairly simple way create something that looks like a JComboBox but that also supports submenus. 回答1: This is an example found in: http://www.java2s.com/Code

问题 I'm receiving the error "local variable box is accessed from within inner class; needs to be declared final". That seems alright, but I don't really think it's the best solution, so I was hoping maybe someone else can help me out. Here is my code: public void showPublisherBox(JComboBox box) { if (publisherBox == null) { publisherBox = new AddPublisherForm(); publisherBox.setLocationRelativeTo(this); } publisherBox.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent

问题 I'm receiving the error "local variable box is accessed from within inner class; needs to be declared final". That seems alright, but I don't really think it's the best solution, so I was hoping maybe someone else can help me out. Here is my code: public void showPublisherBox(JComboBox box) { if (publisherBox == null) { publisherBox = new AddPublisherForm(); publisherBox.setLocationRelativeTo(this); } publisherBox.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent

问题 I am trying to create a Jtable with two combobox in each row. I have checked for tutorials on that and found that I can add static data inside combobox. But how come I can have dynamic data loaded into a combobox. Even, whenever the user selects the combobox 1 from the row, then based on that, the combobox 2 will be updated. Can anybody help me on this? If I do removeAllItems() from the combobox, then the combobox 2 will updated, but I am unable to add new entries. Thanks in advance. 回答1:

问题 I have created a GUI and have a database located externally in which I fetch data from. I am using the GUI builder in NetBeans to do this. Does anyone know of a simple way to populate a jComboBox with values coming from the database? When I run the project there are no errors but the combo box remains empty. Here is the code that sets the combo box with the names of discounts: public void setDiscountNames(String type, JComboBox cbox) { cbox.removeAllItems(); ArrayList<Discount> names = new

问题 I have read through the majority of the JTable/JComboBox responses to other questions of this ilk, but haven't yet found a solution to my problem. I have created a table that has JComboBox TableHeader elements. None of the JComboBox elements will open to display a list of items. How do I get the item lists for the individual JComboBox elements to display? Please note that a distinguishing element of this question is that the JComboBox is in the TableHeader, not embedded within a JTable cell.

问题 In Java Swing, what's the best way for a JList and a JComboBox to be synchronized in terms of the data, i.e., to have the same list of items at any given point of time? Basically, if I add items to (or remove items from) one, the other should reflect the change automatically. I've tried doing the following, but it doesn't seem to work: JList list = new JList(); JComboBox comboBox = new JComboBox(); DefaultListModel listModel = new DefaultListModel(); // add items to listModel... list.setModel

问题 In Java Swing, what's the best way for a JList and a JComboBox to be synchronized in terms of the data, i.e., to have the same list of items at any given point of time? Basically, if I add items to (or remove items from) one, the other should reflect the change automatically. I've tried doing the following, but it doesn't seem to work: JList list = new JList(); JComboBox comboBox = new JComboBox(); DefaultListModel listModel = new DefaultListModel(); // add items to listModel... list.setModel

问题 This question already has answers here : Change background color editable JComboBox (2 answers) Closed 3 years ago . I want a JComboBox without a arrow button (done), which has a green background, when enabled and a gray background when disabled (not done). I also use a custom renderer for the drop down list (done) I checked the source code of BasicComboBoxUI and tried to override some methods, but nothing happens. The dropdown always has a gray/blue background. Here is a SSCCE with my last