CheckBoxListener is not abstract......什么意思
各位大虾帮忙看一下,下面的错误什么意思?GUIDemo3.java:45: GUIDemo3.CheckBoxListener is not abstract and does not overrid
e abstract method itemStateChanged(java.awt.event.ItemEvent) in java.awt.event.I
temListener
class CheckBoxListener implements ItemListener
^
1 error