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You need to use getContentPane()
private void clearAllComoboxes(JFrame frame){ Component[] components = frame.getContentPane().getComponents(); for(Component component : components){ if(component instanceof JComboBox){ ((JComboBox) component).removeAllItems(); } } } private void setValuesToComoboxes(JFrame frame, String[] values){ Component[] components = frame.getContentPane().getComponents(); for(Component component : components){ if(component instanceof JComboBox){ for(String value : values){ ((JComboBox) component).addItem(value); } } } }
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