e790. 设置JSpinner的边框

 // 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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