大家帮我看看这个错误提示说的是什么?
--------------------Configuration: j2sdk1.4.2 <Default>--------------------
D:\java\Calc1.java:3: Calc1 is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener
public class Calc1 implements ActionListener
^
1 error
Process completed.
为什么会这样?
如何解决?