jcombobox

问题 Here is a scenario: I have two JComboBoxes (call them combo1 and combo2 ) that get their values from a database [In the DB, these two have a 1:M relationship]. When the screen shows up I populate combo1 with values from the database and then take the first entry in the list and get its corresponding values to populate combo2. Since the values of combo2 depend on what is selected in combo1, every time the selection changes in combo1 a call is made to the database to get matching values to

问题 This question already has an answer here : Java JComboBox Incompatible Types: Cannot be converted to string (1 answer) Closed last month . In this question (Adding items to a JComboBox) it is described how an Item can be added to a JComboBox. This would allow to store an Object in a JComboBox, and overriding the toString() method the JComboBox would display a value and it will return the whole object. I have included the following class: public class ComboItem { private String key; private

问题 This question already has an answer here : Java JComboBox Incompatible Types: Cannot be converted to string (1 answer) Closed last month . In this question (Adding items to a JComboBox) it is described how an Item can be added to a JComboBox. This would allow to store an Object in a JComboBox, and overriding the toString() method the JComboBox would display a value and it will return the whole object. I have included the following class: public class ComboItem { private String key; private

问题 I'm trying to make a multi-column JComboBox. I've looked around quite a bit and it seems to be a very tricky thing to do. Unless many people, I'm not interested in having a table (where you select a row): I need to eliminate the scroll bar in the JComboBox and, in order to achieve this, I want to lay its items in a multi-column list instead of having them in only one column. My best bet so far was to do this: JComboBox dropdown = new JComboBox(validValues); CellRendererPane crp =

问题 I've created an application in netbeans IDE 6.9 where I need to set values for each value in the jcombobox. In my pane I've a combobox and below that are the textfields for entering values for each value in the combobox. Can anyone suggest that how do I link the combobox with textfield. I mean there are different values for each value in the combobox. I want that user selects a value in the combobox then its corresponding value should be displayed(if it has already been entered) otherwise a

问题 I am new to JAVA and I am trying to make a JTable. What I want is that whenever a user make a selection from the comboBox in the Jtable, the Jtable will put the current date in the cell next to the comboBox. I wrote a code, but the code cannot upate the cell value. Here is my code(I just want the Jtable to insert "a" at row 1 column 4 for right now). public class GChamber extends JPanel { private boolean DEBUG = true; ListSelectionModel listSelectionModel; public GChamber() { ... JTable

问题 I have a small app that generates statistic charts from a MySQL DB via JPA. To select which DB components to include in the statistic I have installed 2 JComboBoxes. First JComboBox is populated with the elements of Category1, second JComboBox with elements from Category2, which is a subcategory of Category1. What i want to do is populate JComboBox2 only with the elements of Category2 that are linked to the selection in JComboBox1. Example: Category1 is car brands, Category2 is models; I want

问题 I'm trying to understand how getListCellRendererComponent method works but I don't get it. I made a separate class that extends BasicComboBoxRenderer and I added a counter which is printed every time getListCellRendererComponent is called. I then run a test class with a main method that shows a frame with just a JComboBox that uses my custom renderer class. This combobox has 3 items in total and I've set setMaximumRowCount(2) so it only shows 2 of them. When I first run the program and the

问题 With refrence To The Question! By abg and answer By mKorBel. And Using J2s Auto Complete Combo Box! The Code in the Answer By mKorBel For My Case Is Not Working When I use Item Class instead of String for ArrayList items. Vector<Vector<String>> comboData=util.GetComboData(); ArrayList<String> listSomeString = util.GetListForComboBox(comboData); Java2sAutoComboBox comboBox = new Java2sAutoComboBox(listSomeString); comboBox.setDataList(listSomeString); column.setCellEditor(new DefaultCellEditor

问题 I like to change the UI of a JComboBox from the default metal look to some custom UI, see attached image. I have tried changing all the UIDefaults for the JComboBox but to no success. How does one achieve this? jdk1.4.2 回答1: You have to write your own ComboBoxUI class. I suggest to look at either Synth or Nimbus Look and Feel to make it easier. 回答2: you need to change arrow image , and in style change background for this JComboBox ! 回答3: use WindowsLookAndFeel; this works if and only if you