jcombobox

问题 I am making a font chooser using JComboBox and a custom ListCellRenderer . I want the JComboBox to display all available fonts, with each font name displayed in its own font. I am currently using around 500 fonts. An example of a ListCellRenerer that provides this functionality: private class ComboBoxRenderer extends JLabel implements ListCellRenderer { private JLabel label = new JLabel("Test"); @Override public Component getListCellRendererComponent(JList list, Object value, int index,

问题 I'm trying to calculate running totals using JTable and Combo combination, sometime it calculate right but on random value selection I get wrong answer. Here is my code which I'm using to test running totals calculation, any help would be highly appreciated: import java.awt.Component; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.MouseEvent; import java

问题 I am populating a JComboBox (using addItem() ) with all the elements of a collection. Each element in the collection is a HashMap (so its a ComboBox of Hashmaps..). My question is - Given that I need each item to be a HashMap how do I set the text to apear in the combobox on the GUI? It needs to be the value of a certain key in the map. Normally if I am populating a combobox with my own type, I would just overide the toString() method...but I am not sure how to acheive this since I am using a

问题 Let me first explain what I'm looking to achieve. I'm creating a data entry form in Swing, made up of a number of JComboBoxes & JTextFields. A validation routine iterates over those components and determines if the values specified for each control are 'valid' (the details of the validation are irrelevant for the purposes of this example). When the routine identifies that a component contains an invalid value, I want to change the background color of that field, and also the foreground/text

问题 Heyy; I am developing a small swing based application with hibernate in java. And I want fill combobox from database coloumn. How I can do that? And I don't know in where(under initComponents , buttonActionPerformd ) I need to do. For saving I'am using jbutton and it's code is here : private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { int idd=Integer.parseInt(jTextField1.getText()); String name=jTextField2.getText(); String description=jTextField3.getText(); Session session

问题 I use the following code for retrieve the data from mysql Student data Base.It was work properly.It will show the student Name in combo box.The value is retrieved from Db. My problem is the first value(first student Name which is stored in Database column) displayed in the Jcombobox name field Automatically and it was show when I click Combo Box arrow..It means when I execute this following code I see the first value(first Name) in combobox's name field nearby arrow .But I need "Student Name"

问题 This code is sloppy, I would also welcome some feedback on it. I'm trying to change the value of a JComboBox based on the value of another JComboBox. There is an additional complication in that I'm using an additional class to determine what array of strings to return (see my previous question). In theory, the code I have should work: String[] siteSelectStrings = {"Site", "London", "Long Island"}; JComboBox regSiteSelectBox = new JComboBox(siteSelectStrings); regSiteSelectBox.addItemListener

问题 I am having a problem on what to use and what to code if I want my combo box be generated once the user type a key... like: once i pressed letter "A" from keyboard inside the combo box, all items starting from letter "A" will show up from the drop down list. How can I code this when: items from the combo box came from my database and it's default value is the first item stored on my database. Actually I don't have any idea how to code it. All I have was a template from JFrame. Items from

问题 Updated Question Part 1: Originally, I was first going to remove the highlight selection after an item has been selected (because this was messing up the background color for the selection made). I saw this could be done from here > Delete highlighting in JComboBox - (Solved) Part 2: Now... I'm trying to have it identify the selected text, and change the background color (when selected, and not when mouse hovers over item in list) depending on which text was selected. It does change the color

问题 Updated Question Part 1: Originally, I was first going to remove the highlight selection after an item has been selected (because this was messing up the background color for the selection made). I saw this could be done from here > Delete highlighting in JComboBox - (Solved) Part 2: Now... I'm trying to have it identify the selected text, and change the background color (when selected, and not when mouse hovers over item in list) depending on which text was selected. It does change the color