@Ann – the best way to delete the object is via its Matlab container panel, which is accessible as the 2nd output of javacomponent:

[jRangeSlider, hContainer] = javacomponent(jRangeSlider, [150,150,850,80], hObject);
...
delete(hContainer)

Thank you for your great blog.
I want to use a slider so I add it to my figure in my UI_OpeningFcn(hObject is the handle to the figure).

jRangeSlider = javacomponent(jRangeSlider, [150,150,850,80], hObject);
set(jRangeSlider, 'Background',java.awt.Color.white);
set(jRangeSlider, 'StateChangedCallback', {@sliderStartEndPoint_Callback, hObject});

However, my GUI leads to to other GUIs. That is, whenever the user press a button, the main GUI is replaced by another GUI. Therefore I need to delete my java Object. How can I do this?
Since I have to access to it from the callback of the pushbutton, I’m not sure how to access the handle of the object. I have the handle of the figure but whenever I do this

findobj(hObject.Parent, 'Type', 'JavaWrapper')

I just get

  0x0 empty GraphicsPlaceholder array.

What am I doing wrong? How can I delete this object?

Thanks in advance

yes

Thanks Yair,

So, it would be better to use javacomponent here?

jhBut = handle(javaObjectEDT('javax.swing.JButton','Hello!'),'CallbackProperties');
jhBut.ActionPerformedCallback = @this.onAction;

hPanel = uipanel(...);
hgjavacomponent('Parent',hPanel','JavaPeer',jhBut,'Units','norms','Position',[0,0,1,1]);

@Collin – hgjavacomponent is a Matlab class that is meant to contain the relevant information on a contained Java-component (peer). You can think of it as a borderless panel that tightly-fits the Java peer, and enables users to set the control’s position, units etc. in a manner that is very similar to standard Matlab uipanels. Importantly, hgjavacomponent only creates this wrapper object, NOT the peer.

In contrast, javacomponent places the Java peer in the requested position, and also creates a corresponding hgjavacomponent object to provide the uipanel-like wrapper functionality. Both of these handles are returned when you call javacomponent (the java peer reference handle, followed by the hgjavacomponent container handle):

[hjControl, hContainer] = javacomponent(...)

Is there a benefit to using javcomponent over hgjavacomponent?

@Anu – this sounds like a bug in your code. Errors are not supposed to happen.

@johanes – you can do this:

set([guiel.elementA, guiel.elementB], 'Font', newFont2);