Update JScrollPane content (JList)

[Andres Del Pino]

Hi, i´m having a problem doing this, i´ve been searching but didn´t find something useful so i ask you...

I have some JScrollPane and when someone click a button i want to change the contents of the JScrollPane

Here comes some code:

  private JList sensorList,actuatorList,sectionList;
	private ListSelectionModel listSensorSelectionModel, listActuatorSelectionModel, listSectionSelectionModel;
	private JScrollPane sensorListScroller, actuatorListScroller, sectionListScroller;

listaSecciones.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		sectionList.setLayoutOrientation(JList.VERTICAL);
		sectionList.setVisibleRowCount(-1);
		listSectionSelectionModel = sectionList.getSelectionModel();
		listSectionSelectionModel.addListSelectionListener(new SharedSectionListSelectionHandler(ButtonsFrame.this));
		sectionListScroller = new JScrollPane(listaSecciones);
		sectionListScroller.setPreferredSize(new Dimension(100,botonSensor.getHeight()));
		
		sensorList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		sensorList.setLayoutOrientation(JList.VERTICAL);
		sensorList.setVisibleRowCount(-1);
		listSensorSelectionModel = sensorList.getSelectionModel();
		listSensorSelectionModel.addListSelectionListener( new SharedSensorListSelectionHandler(ButtonsFrame.this) );
		sensorListScroller = new JScrollPane(sensorList);
		sensorListScroller.setPreferredSize(new Dimension(100, botonSensor.getHeight( )));
		
//more code

		actuatorList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		actuatorList.setLayoutOrientation(JList.VERTICAL);
		actuatorList.setVisibleRowCount(-1);
		listActuatorSelectionModel = actuatorList.getSelectionModel();
		listActuatorSelectionModel.addListSelectionListener( new SharedActuatorListSelectionHandler(ButtonsFrame.this) );
		actuatorListScroller = new JScrollPane(listaActuadores);
		actuatorListScroller.setPreferredSize(new Dimension(100, botonActuador.getHeight( )));

//more code
add(botonSeccion);
		add(sectionlistScroller);
		add(sensorButton);
		add(sensorListScroller);
		add(actuatorButton);
		add(actuatorListScroller);
		add(botonMover);
		add(botonBorrar);
		add(botonLimpiar);
		add(botonExaminar);
		add(botonGuardar);
		add(comentario);

  

And when i click the button i do this:

   public void change(String nombreSeccion){
		try {
			sensorList = new JList(newList.getVectorSensores( ));
			actuatorList = new JList(newList.getVectorActuadores( ));
			Vector<String> sections = newList.getVectorSecciones();
//more code
			sectionList = new JList(sections);
			listSensorSelectionModel = sensorList.getSelectionModel();
			listSectionSelectionModel = sectionList.getSelectionModel();
			listActuatorSelectionModel = actuatorList.getSelectionModel();
			sectionListScroller = new JScrollPane(sectionList);
			sensorListScroller = new JScrollPane(sensorList);
			actuatorListScroller = new JScrollPane(actuatorList);
			sectionListScroller.repaint();
			sensorListScroller.repaint();
			actuatorListScroller.repaint();
			this.repaint();
		} catch (Exception e) {
			e.printStackTrace();
		} 
	} 

But this seems to do nothing, any help? <-- UPDATE
In fact it does something, internally it seems to have changed, but I still see the same info. For example...
I have a JScrollPane and it shows elements 4 5 and 6, when i press the button it should only show 5 but i still see 4, 5 and 6, but when i click any of them it has element 5 info like it has really changed but i need to see only 5 in the JScrollPane
This is an applet, but that doesn´t change anything, right?
Thank you

[Maneesh Godbole]

I have a bit of a trouble understanding the code because of the non english names

If you want to update the data in the JList use JList#setListData
If you want to show/hide the JLists (embedded inside the JScrollPane) always invoke JPanel#revalidate and JPanel#repaint after you finish adding/removing

[Andres Del Pino]

Sorry the code was in spanish, I translated it so you can understand it better.

I solved it, the problem was the JPanel#revalidate, i wasn´t doing it, so, thank you Maneesh.

I´ll post the final code for people with the same problem:

   public void change(String nombreSeccion){
		try {
			//more code
			sensorList.setListData(newList.getSensorVector());
			actuatorList.setListData(newList.getActuatorVector( ));
			Vector<String> sections = newList.getSectionVector();
			//more code
			sectionList.setListData(sections);
			listSensorSelectionModel = listaSensores.getSelectionModel();
			listSectionSelectionModel = listaSecciones.getSelectionModel();
			listActuatorSelectionModel = listaActuadores.getSelectionModel();
			this.revalidate();
			this.repaint();
		} catch (Exception e) {
			e.printStackTrace();
		} 
	} 

Thanks for the help.