This is my code :

import java.awt.Button;
import java.awt.Component;
import java.awt.Container;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.*;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SpringLayout;

public class SpringSample extends Frame implements ActionListener

{

    private static final long serialVersionUID = 1L;

    SpringSample()
    {

         JFrame frame = new JFrame("Login Area!");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            Container contentPane = frame.getContentPane();
            JPanel p = new JPanel(new SpringLayout());
            SpringLayout layout = (new SpringLayout());
            contentPane.setLayout(layout);         
            JPanel p1=new JPanel();    


            Component F_namelbl = new JLabel("Firstname: ");
            Component L_namelbl = new JLabel("Lastname: ");
            Component tf_Fname = new JTextField(15);
            Component tf_Lname = new JTextField(15);
            Component Lbl_HW = new JLabel("< Login Area >");
            Component Btn = new JButton("Login");
            Component btn_cancel = new JButton("Cancel");


            frame.add(p1);
            contentPane.add(F_namelbl);
            contentPane.add(L_namelbl);
            contentPane.add(tf_Fname);
            contentPane.add(tf_Lname);
            contentPane.add(Lbl_HW);
            contentPane.add(Btn);
            contentPane.add(btn_cancel);



            layout.putConstraint(SpringLayout.WEST, Lbl_HW, 140, SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, Lbl_HW, 0, SpringLayout.NORTH, contentPane);    
            layout.putConstraint(SpringLayout.WEST, Lbl_HW, 140, SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, Lbl_HW, 0, SpringLayout.NORTH, contentPane);
            layout.putConstraint(SpringLayout.WEST, F_namelbl, 30, SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, F_namelbl, 25, SpringLayout.NORTH, contentPane);
            layout.putConstraint(SpringLayout.WEST, L_namelbl, 30, SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, L_namelbl, 50, SpringLayout.NORTH, contentPane);
            layout.putConstraint(SpringLayout.NORTH, tf_Fname, 25, SpringLayout.NORTH, contentPane);
            layout.putConstraint(SpringLayout.WEST, tf_Fname, 15, SpringLayout.EAST, F_namelbl);
            layout.putConstraint(SpringLayout.NORTH, tf_Lname, 50, SpringLayout.NORTH, contentPane);
            layout.putConstraint(SpringLayout.WEST, tf_Lname, 15, SpringLayout.EAST, F_namelbl);
            layout.putConstraint(SpringLayout.NORTH, Btn, 80, SpringLayout.NORTH, contentPane);
            layout.putConstraint(SpringLayout.WEST, Btn, 110, SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, btn_cancel, 80, SpringLayout.NORTH, p1);
            layout.putConstraint(SpringLayout.WEST, btn_cancel, 200, SpringLayout.WEST, p1);        


            btn_cancel.addActionListener(this);



            frame.pack();
            frame.setSize(350, 200);
            frame.setVisible(true);



    }
  public static void main(String args[]) 
  {  

    new SpringSample();

  }


 public void actionPerformed(ActionEvent e) 
{

    System.out.println("Hello There");

}
}

Now the red line is under "addActionListener" on

btn_cancel.addActionListener(this);

this line

The error is

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    The method addActionListener(SpringSample) is undefined for the type Component

    at SpringSample.<init>(SpringSample.java:81)
    at SpringSample.main(SpringSample.java:96)

I think it is not allowing me to set ActionListener to Button "btn_cancel"

You are mixing AWT components and Swing components - this is a formula for confusion and errors. Unless you have some very special reason you should always use Swing components rather than AWT. The swing components have names that begin with a J (JFrame, JButton etc). The ones without the initial J (Frame, Button etc) are the mostly-obsolete AWT versions.
Component btn_cancel = new JButton("Cancel");
Component class doesn't have action listeners. Why not simply
JButton btn_cancel = new JButton("Cancel");

Edited 3 Years Ago by JamesCherrill

Ok thanks ...I didn't know that ,and it works fine now.

Thanks a lot.

Glad to help! If you now have the answer to your original problem please mark this thread "solved" and start a new thread if you have a new problem - it helps to keep all this info properly organised a usable for others.

This question has already been answered. Start a new discussion instead.