如何获得上一个或最后一个项目?

本文介绍了如何获得上一个或最后一个项目?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如何获取最后一个或上一个或未选择的项目，然后获得JComboBox的新项目?

How do I get the last or previous or unselected item and then the new item for a JComboBox?

推荐答案

我假定这适用于所有允许向其添加项目侦听器的对象.

I assume this applies to all Objects that allow for which you to add Item Listeners to them.

String[] items = {"item 1","item 2"," item 3","item 4"}; JComboBox combo = new JComboBox(items) combo.addItemListener(new ItemListener(){ public void itemStateChanged(ItemEvent ie) { if(ie.getStateChange() == ItemEvent.DESELECTED) //edit: bracket was missing { System.out.println("Previous item: " + ie.getItem()); //edit: bracket was missing } else if(ie.getStateChange() == ItemEvent.SELECTED) { System.out.println("Current \ New item: " + ie.getItem()); } }