// Create a number spinner
JSpinner spinner = new JSpinner();
// Get the text field
JFormattedTextField tf =
((JSpinner.DefaultEditor)spinner.getEditor()).getTextField();
// Set the margin (add two spaces to the left and right side of the value)
int top = 0;
int left = 2;
int bottom = 0;
int right = 2;
Insets insets = new Insets(top, left, bottom, right);
tf.setMargin(insets);
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