- 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
为什么在组合框中选择项目时会调用此事件两次.
解决方法
对于单个更改,JComoboBox ItemListener会被调用两次.一次用于SELECTED事件,一次用于DESELECTED事件.
有关如何编写ItemListener的信息,请参见this tutorial page.
基本上你要做的就是
- 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.
- }
- }
