logo
down
shadow

ArrayList in one class is updated using GUI but is not changing in the JComboBox in another


ArrayList in one class is updated using GUI but is not changing in the JComboBox in another

By : ArchStanton
Date : November 20 2020, 03:01 PM
This might help you What you need is to use the DefaultComboBoxModel as the data model for the combo box. Swing is based on a pattern called MVC :
M for Model, hence the DefaultComboBoxModel V for View, your JComboBox C for controller, links the view and the model
code :


Share : facebook icon twitter icon
Changing elements of a JComboBox according to the selection from another JComboBox

Changing elements of a JComboBox according to the selection from another JComboBox


By : Dawid Dąbrowski
Date : March 29 2020, 07:55 AM
this will help 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. , First, add a listener on the Combobox1 :
code :
private void comboBox1ItemStateChanged(java.awt.event.ItemEvent evt) {                                                     

    if (java.awt.event.ItemEvent.DESELECTED == evt.getStateChange()) {

        String valueBeforeDeselection = evt.getItem().toString();
        // Do something if needed

    } else if (java.awt.event.ItemEvent.SELECTED == evt.getStateChange()) {

        String valueAfterSelection = evt.getItem().toString();
        // Set the values of the ComboBox2
    }
}
comboBox2.removeAllItems();
comboBox2.addItem("Value 1");
comboBox2.addItem("Value 2");
Populating a JComboBox with an ArrayList from another class

Populating a JComboBox with an ArrayList from another class


By : Northst4r
Date : March 29 2020, 07:55 AM
it should still fix some issue Your problem is in the line: box.addItem(list.toArray());
The addItem() method for a JComboBox requires an Object as a parameter. Typically, a String object is used as the parameter. Instead, what you are doing is trying to add the actual list reference to the combo box when you really meant to add every item in the list.
code :
for(Stuff stuff : list) {
    box.addItem(stuff.getName());
}
private ArrayList<Stuff> list = new ArrayList<>();
private Stuff = new Stuff();
for(String detail : stuff.getList()) {
    box.addItem(detail); // add each extracted detail from the text file that was stored in the list of the stuff object
}
Populate a JComboBox with an ArrayList from a different class

Populate a JComboBox with an ArrayList from a different class


By : A.rh
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I'm currently stuck in this part of a class project... I need to create an ArrayList from a text file; text file has account numbers that need to be populated in a JComboBox. This is what I have so far... only the first account number populates missing the rest not sure what my mistake is , I would have thought that what you want is
code :
while(line != null)  {
    columns = line.split("<>");
    accountNumber = columns[0];
    test.add(accountNumber);
    ....
}
public ArrayList getAccountNumbers( ){
   return test;
}
Fill JComboBox after changing another JComboBox

Fill JComboBox after changing another JComboBox


By : saishivaprasad
Date : March 29 2020, 07:55 AM
I wish this helpful for you As I understand, your combobox boxFaculty shows the keys of treeMap which are faculty names and your combobox boxSpeciality should show the specialities of each faculty ( which is one of the values of the treeMap ).
If you want the boxSpeciality to be populated based on selection of boxFaculty, you should write an actionListener on boxFaculty.
code :
DefaultComboBoxModel<Speciality> specialityModel = new DefaultComboBoxModel<Speciality>();
boxSpeciality.setModel( specialityModel );
boxFaculty.addActionListener( new ActionListener()
{
    @Override
    public void actionPerformed(ActionEvent e)
    {
        Object obj = boxFaculty.getSelectedItem();
        if ( obj != null )
        { 
           ArrayList<Speciality> specialities = treeMap.get( obj );
           specialityModel.removeAllElements();
           for ( Speciality speciality : specialities )
           {
              specialityModel.addElement( speciality );
           }
        }

    }

});
NetBeans - JComboBox warning - missing type arguments for generic class JComboBox<E>

NetBeans - JComboBox warning - missing type arguments for generic class JComboBox<E>


By : Eric Downing
Date : March 29 2020, 07:55 AM
I wish this helpful for you In Netbeans 7.2 you can click on Code section for JComboBox, and then write type into "Type Parameters", in your case: .
Related Posts Related Posts :
  • Interrupt CompletableFuture with default value
  • Eclipse - Choosing servers in "Run on server" vs setting "Target Runtime"
  • Spring JPA doesn't validate bean on update
  • How is takeWhile different from filter?
  • Spring Scheduled Cron jobs firing at wrong time
  • JFrame window resizing on every compile. Different results every time
  • Kotlin unresolved reference :add after converting from Java code
  • How to use Neo4j APOC method " apoc.export.csv.query(query,file,config)" in Java program
  • Regex to include all spanish characters and number
  • Parsing and Mapping a JSON Object with Dynamic Properties
  • Which approach to building domain objects in Spring MVC is more correct?
  • Java Long Min and Max not exact as mentioned in docs
  • Selenium opens new tab after SendKeys
  • How to sort a large array of ints?
  • FitNessse Test can not find Fixture
  • Including Signed Libraries in Executable JAR with Maven
  • If and Else statement run on second iteration of while loop
  • Change class of disabled tab on change of dropdown value
  • Junit5 @ParameterizedTest How to pass array as one of parameter
  • Text message not being sent to a list of numbers but is sent when just one number is specified
  • Spring mapped servlet not called in jetty-maven-plugin
  • How to pace the consumption of a sqs queue using spring integration
  • Autowiring Not getting disabled using xml configuration
  • Maze solve and shortest path with Java BFS
  • Spinner updating only on user actions
  • Why are Java rules for protected access such as they are?
  • Modify parameter of method by value in annotation aspectJ
  • How to send sensitive data to a Liferay portlet from outside the Liferay portal
  • Does a server connection stay open if created inside a method?
  • JAR manifest Class-Path, use folder instead of jar
  • How to do a bulk update in Firestore
  • ItemArray.checklist.add() not appending string to ArrayList
  • How to move something on screen without other picture staying there
  • SpringBoot : No matching bean found exception
  • Implementing the Clonable interface, but don't have to override the clone() method
  • how can i get this code to choose a random word once from each array to print a sentence?
  • Static class to get connections from connection pool
  • Unable to start Chrome browser with user profile in Selenium
  • How to pass a object to be created as a parameter for a method in Java?
  • How to retry with hystrix
  • Loading key to KeyStore fails on Android Oreo
  • Spring+Velocity unsuccessful attempts to save object
  • Private constructor in Kotlin
  • Jetty:run fails with NoSuchMethodError with Spring 5
  • Cannot upload my Web Applicartion in Jboss7 EAP7 EAP
  • How to load a certificate from "Credential storage"?
  • Call Genexus procedure stub in Java environment
  • JavaFX clipping produces a 'lottery scratch ticket'-Effect
  • Using DateTimeFormatter on january first cause an invalid year value
  • Get all the output from Watson conversation using java
  • Java unable to open main class and jar file
  • How to override @override method from activity into another class
  • Adding Runtime VM parameters to intellij for Java 9
  • Java IBM MQ Client connected but not getting messages from queue
  • Questions of Tomcat SSL configuration
  • Stale JNLP files for <extension> (since Java 9?)
  • Properly set (system) properties in JUnit 5
  • Spring MVC Model within POST Method is empty
  • VSTS buildagent: Java 9
  • java.lang.NumberFormatException: For input string: "id" for Hibernate
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org