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JSpinner is a container of other components, one of which is a the editor.

JSpinner spinner = ...;
JComponent editor = spinner.getEditor();
But that doesn't help us, as setHorizontalAligment isn't a method of JComponent.
You can then inspect the editor type of component it is...
if (editor instanceof JSpinner.DefaultEditor) {
If it's a JSpinner.DefaultEditor, you can cast it and use setHorizontalAlignment...
JSpinner.DefaultEditor spinnerEditor = (JSpinner.DefaultEditor)editor;
spinnerEditor.getTextField().setHorizontalAlignment(JTextField.CENTER);
Potentionally you may also need to check for JTextField as well, but if you're using the default editor models, it would normally return JSpinner.DefaultEditor
                sadly, the JSpinner doesn't seem to have an instance of JTextField... But thanks for the quick answer!
– user3342795
                Mar 28, 2014 at 0:43
                Thanks you very much! This worked just fine! I hated the text to be on the right somehow. Thanks again! :)
– user3342795
                Mar 28, 2014 at 0:52
                I'd like to add a couple of things to this answer: 1) The reason for this behavior is that apparently the JSpinner component creates its internal TextField using the parent control’s property values when it is first rendered, and then ignores changes to the parent property values. 2) If working with JComponents in MATLAB, it is sufficient to call e.g. jSpinner.getEditor.getTextField.setHorizontalAlignment(javax.swing.JTextField.LEFT); to get the desired effect.
– Dev-iL
                May 9, 2016 at 9:44
                jSpinner.getEditor.getTextField.setHorizontalAlignment(javax.swing.JTextField.L‌​EFT); ... which is basically what the answer says
– MadProgrammer
                May 9, 2016 at 10:10
        
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