Error at addListSelectionListener(this)

[deepak carter]

Hi All,

its showing an in the line // list.addListSelectionListener(this);

package Swing;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;

class JListTest
{
	JFrame f;
	JPanel p;
	JList list;
	JLabel label;
	JScrollPane pane;
	String[] string={"C#","JAVA","C","C++","Servlet","JSP"};
	JListTest()
	{
		f=new JFrame("My Frame");
		label=new JLabel("Yout Text here");
		p=new JPanel();
		list=new JList(string);
		pane=new JScrollPane(list);
		pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		pane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		list.setVisibleRowCount(3);
		list.addListSelectionListener(this);
		//pane.add(l);
		list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		p.add(pane);
		f.add(p);

		f.setSize(400,300);
		f.setVisible(true);
	}
	public static void main(String[] args)
	{
		new JListTest();
	}
	public void valueChanged(ListSelectionEvent e)
	{
		String s=(String)list.getSelectedValue();
	}
}

[Rob Spoor]

Next time please show the error. However, this time it's pretty obvious - this is an instance of JListTest, and that does not implement ListSelectionListener.

[Randall Twede]

it was even obvious to me. you have to implement the listener interface

[Darryl Burke]

Or better still, add a ListSelectionListener in the form of an anonymous inner class.