Hi,
In order to create an instance of an inner class, you first need to create
an instance of the outer class.
For example,
public class Outer {
public Outer(){
}
public class Inner {
public Inner(){
}
}
}
With these classes, you cannot call new Inner() on its own. You need to have
an instance of Outer first.
Outer o = new Outer();
Inner i = o.new Inner();
or
Inner i = new Outer().new Inner();
Hope this helps.
James
-----Original Message-----
From: java-ee-j2ee-programming-with-passion@googlegroups.com
[mailto:java-ee-j2ee-programming-with-pass...@googlegroups.com] On Behalf Of
tedpottel
Sent: 24 June 2009 21:18
To: Java EE (J2EE) Programming with Passion!
Subject: [java ee programming] New Programmer needs help
Hi,
I'm trying to learn how to use buttons, I have the following code
public class mySwing {
class action implements ActionListener {
public void actionPerformed(ActionEvent e)
{
// do something
System.out.println("ted");
}
}
public static void main(String[] arg)
{
JFrame frame = new JFrame("The Frame");
frame.setSize(400,400);
frame.setLocation(10,10);
frame.setVisible(true);
Container con = frame.getContentPane();
con.setLayout(new FlowLayout());
con.add( new JLabel("hi"));
con.add(new JLabel("ted"));
// ad a button
JButton but = new JButton("fred");
action a = new action();
but.addActionListener( a);
con.add(but);
}
}
I get a error on
action a = new action()
eclipse says
Description
No enclosing instance of type mySwing is accessible. Must qualify the
allocation with an enclosing instance of type mySwing (e.g. x.new A()
where x is an instance of mySwing). mySwing.java testswing/src line
34
Java Problem
Can somebody explains what this means?????????
-Ted
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05:53:00
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