如何使用Java中的非抽象类实现ActionListener
[英]How do I implement ActionListener with a non abstract class in Java
问题描述
Here is a code that i am trying to compile.all i get is error like this 
这是我正在尝试编译的代码。我得到的都是这样的错误
s09_02 is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener. s09_02不是抽象的，并且不会覆盖java.awt.event.ActionListener中的抽象方法actionPerformed（java.awt.event.ActionEvent）。
So my question is, how can I implement ActionListener into my class (s09_02) if the class is not abstract? 所以我的问题是，如果类不是抽象的，该如何在我的类（s09_02）中实现ActionListener？
Here is the entire code: (Because I have no idea where the problem could be) 这是完整的代码：（因为我不知道问题可能在哪里）
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class s09_02 extends Applet implements ActionListener{
public void init()
{
setLayout(null);
setBackground(new Color(0,10,100));
}
public void paint(Graphics p){String t=null;
int x,y,w,h,r,g,b;
t=getParameter("xx");
x=Integer.parseInt(t);
t=getParameter("yy");
y=Integer.parseInt(t);
t=getParameter("ww");
w=Integer.parseInt(t);
t=getParameter("hh");
h=Integer.parseInt(t);
t=getParameter("rr");
r=Integer.parseInt(t);
t=getParameter("gg");
g=Integer.parseInt(t);
t=getParameter("bb");
b=Integer.parseInt(t);
p.setColor(new Color(r,g,b));
p.fillRect(x,y,w,h);
} } }}
<html>
<body>
<applet code="s09_02.class" width=400 height=400>
<param name="xx" value="25"><param name="yy" value="25">
<param name="ww" value="150"><param name="hh" value="150">
<param name="rr" value="0"><param name="gg" value="150">
<param name="bb" value="100">
</applet>
</body>
</html>
Also suggest me what changes should i make in this code so that code runs properly ??
Thanks...
2 个解决方案
解决方案1
3 已采纳 2014-04-03 04:04:28
You need to add public void actionPerformed(ActionEvent e){} in you code as you are implementing ActionListner . 在实现ActionListner在代码中添加public void actionPerformed(ActionEvent e){} 。
ActionListner is an interface so you need to override the abstract methods of ActionListner ActionListner是一个interface因此您需要覆盖ActionListner的抽象方法
If you are not using any event then remove the implements ActionListner from your code. 如果不使用任何事件，则从代码中删除implements ActionListner 。
解决方案2
2 2014-04-03 04:06:49
You need to implement the method 您需要实现该方法
@override
public void actionPerformed(ActionEvent e){
//code that dose something
}
http://docs.oracle.com/javase/7/docs/api/java/awt/event/ActionListener.html http://docs.oracle.com/javase/7/docs/api/java/awt/event/ActionListener.html
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