Problems with display() method

Question

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class lifeCycle extends JApplet implements ActionListener
     JLabel messageInit = new JLabel("init ");
     JLabel messageStart = new JLabel("start ");
     JLabel messageDisplay = new JLabel("display ");
     JLabel messageAction = new JLabel("action ");
     JLabel messageStop = new JLabel("stop ");
     JLabel messageDestroy = new JLabel("destroy ");
     JButton pushButton = new JButton("Hit me!");
     int countInit, countStart, countDisplay, countAction, countStop, countDestroy;
          public void init(){
              Container con = getContentPane();
              con.setLayout (new FlowLayout());
              ++countInit;
              con.add(messageInit);
              con.add(messageStart);
              con.add(messageDisplay);
              con.add(messageAction);
              con.add(messageStop);
              con.add(messageDestroy);
              con.add(pushButton);
              pressButton.addActionListener(this);
              display();
              showStatus("complete");
          public void start(){
          ++countStart;
          display();
          showStatus("complete");
          public void stop(){
              ++countStop;
              display();
              showStatus("complete");
          public void destroy(){
              ++countDestroy;
              display();
              showStatus("complete");
          public void actionPerformed(ActionEvent e){
              Object source = e.getSource();
              if(source == pushButton){
               ++countAction;
               display();
               showStatus("complete");
}Just trying to learn the basics of life cycles in the swing applet. The display() method is where we're having problems, I'm getting the "cannot resolve symbol" message. I was just wondering what I'm doing wrong here. Thanks!
Kate

Answer 1

hi,
I'm not sure what your applet is suppose to do but i've made some changes. I've moved your Container object declaration out of the "init()", and instead of "pressButton" I changed it to "pushButton" and "display()" to "con.setVisible(true)".
hope this will resolve your issue. Here is the edited code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class lifeCycle extends JApplet implements ActionListener
     JLabel messageInit = new JLabel("init ");
     JLabel messageStart = new JLabel("start ");
     JLabel messageDisplay = new JLabel("display ");
     JLabel messageAction = new JLabel("action ");
     JLabel messageStop = new JLabel("stop ");
     JLabel messageDestroy = new JLabel("destroy ");
     JButton pushButton = new JButton("Hit me!");
     int countInit, countStart, countDisplay, countAction, countStop, countDestroy;
        Container con = getContentPane(); // Moved from init() to here
          public void init(){             
              con.setLayout (new FlowLayout());
              ++countInit;
              con.add(messageInit);
              con.add(messageStart);
              con.add(messageDisplay);
              con.add(messageAction);
              con.add(messageStop);
              con.add(messageDestroy);
              con.add(pushButton);
              pushButton.addActionListener(this);
                    // edited from "pressButton" to "pushButton"
              con.setVisible(true); //used the Container object you created
                                          // instead of "display()";
              showStatus("complete");
          public void start(){
          ++countStart;
          con.setVisible(true);   //used the Container object you created
                                        // instead of "display()";
          showStatus("complete");
          public void stop(){
              ++countStop;
              con.setVisible(true);   //used the Container object you created
                                            // instead of "display()";
              showStatus("complete");
          public void destroy(){
              ++countDestroy;
              con.setVisible(true);  //used the Container object you created
                                            // instead of "display()";
              showStatus("complete");
          public void actionPerformed(ActionEvent e){
              Object source = e.getSource();
              if(source == pushButton){
               ++countAction;
               con.setVisible(true);  //used the Container object you created
                                               // instead of "display()";
               showStatus("complete");
}