JComboBox itemStateChanged event called twice at a time

Question

resultCombo = new JComboBox();
resultCombo.addItemListener(new ItemListener() {
    @Override
    public void itemStateChanged(ItemEvent ie) {
         sampleText=resultCombo.getSelectedItem().toString();
         System.out.println("SampleText : "+sampleText);
    }
});


output:
SampleText : selectedword
SampleText : selectedword

Why this event is called twice when selecting item in combobox.?

Answer 1

JComoboBox ItemListener does get called twice for a single change. Once for SELECTED event and once for DESELECTED event.

See this tutorial page on how to write an ItemListener.

Basically what you have to do is

public void itemStateChanged(ItemEvent e) {
    if (e.getStateChange() == ItemEvent.SELECTED) {
        //Do any operations you need to do when an item is selected.
    } else if(e.getStateChange() == ItemEvent.DESELECTED){
        //Do any operations you need to do when an item is de-selected.
    }
}