Error "class should be declared abstract"

Question

i am having a problem.
when i compile my program, there is one error,
below is the error occurs:
glay2.java:5:glay2 should be declared abstract; it does not define
actionPerformed(java.awt.event.ActionEvent) in glay2
public class glay2 extends
^
Applet implements ActionListener
what does this mean?

Answer 1

below is my codes...
I dun really understand what your are saying.
i got my actionperformed right there? ^^;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class glay2 extends Applet implements ActionListener
// buttons
Button button1, button2, button3, button4, buttonpress,
dsp1, dsp2, dsp3, dsp4,
eable1, eable2, eable3, eable4,
dable1, dable2, dable3, dable4;
// texts
TextField textfield1, pr1, pr2, pr3, pr4;
// labels
Label label1, label2, label3, label4, title;
boolean in1 = true, out1 = false, can1 = false,
dis1 = false, in2 = true, out2 = false, can2 = false,
dis2 = false, in3 = true, out3 = false, can3 = false,
dis3 = false, in4 = true, out4 = false, can4 = false,
dis4 = false;
int pump1[] = {0, 0, 10},
pump2[] = {0, 0, 10},
pump3[] = {0, 0, 10},
pump4[] = {0, 0, 10};
String state1 = "init",
state2 = "init",
state3 = "init",
state4 = "init";
String menu1[] = {"State: ", "Litres: ", "Price: "},
menu2[] = {"State: ", "Litres: "},
menu3[] = {"State: ", "Litres: "},
menu4[] = {"State: ", "Litres: "};
public void init(){
// west panel
button1 = new Button("0.01");
dsp1 = new Button("Dsp 1");
button2 = new Button("0.02");
dsp2 = new Button("Dsp 2");
button3 = new Button("0.03");
dsp3 = new Button("Dsp 3");
button4 = new Button("0.04");
dsp4 = new Button("Dsp 4");
// east panel
eable1 = new Button("Enable 1");
dable1 = new Button("Disable 1");
eable2 = new Button("Enable 2");
dable2 = new Button("Disable 2");
eable3 = new Button("Enable 3");
dable3 = new Button("Disable 3");
eable4 = new Button("Enable 4");
dable4 = new Button("Disable 4");
// south panel
buttonpress = new Button("Set Fuel Price(p)");
textfield1 = new TextField(" ");
// north panel
title = new Label("Jeanifer and Yew Leng's Petrol Station");
// set color for buttons
button1.setBackground(Color.red);
button2.setBackground(Color.red);
button3.setBackground(Color.red);
button4.setBackground(Color.red);
// set color for dsp
dsp1.setBackground(Color.yellow);
dsp2.setBackground(Color.yellow);
dsp3.setBackground(Color.yellow);
dsp4.setBackground(Color.yellow);
// set color for eable
eable1.setBackground(Color.green);
eable2.setBackground(Color.green);
eable3.setBackground(Color.green);
eable4.setBackground(Color.green);
// set color for dable
dable1.setBackground(Color.blue);
dable1.setForeground(Color.white);
dable2.setBackground(Color.blue);
dable2.setForeground(Color.white);
dable3.setBackground(Color.blue);
dable3.setForeground(Color.white);
dable4.setBackground(Color.blue);
dable4.setForeground(Color.white);
// define panel
Panel pn = new Panel();
Panel ps = new Panel();
Panel pw = new Panel();
Panel pe = new Panel();
Panel pc = new Panel();
// layout
setLayout(new BorderLayout());
setBackground(Color.lightGray);
// adding grid for west panel
pw.setLayout(new GridLayout(4,2));
pw.add(button1);
pw.add(dsp1);
pw.add(button2);
pw.add(dsp2);
pw.add(button3);
pw.add(dsp3);
pw.add(button4);
pw.add(dsp4);
// adding grid for east panel
pe.setLayout(new GridLayout(4,2));
pe.add(eable1);
pe.add(dable1);
pe.add(eable2);
pe.add(dable2);
pe.add(eable3);
pe.add(dable3);
pe.add(eable4);
pe.add(dable4);
// place button on south panel
ps.add(buttonpress);
ps.add(textfield1);
//place label on north panel
pn.add(title);
// adding panel
add("North", pn);
add("West", pw);
add("East",pe);
add("South", ps);
add("Center", pc);
// button action
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
buttonpress.addActionListener(this);
//dsp action
dsp1.addActionListener(this);
dsp2.addActionListener(this);
dsp3.addActionListener(this);
dsp4.addActionListener(this);
//enable action
eable1.addActionListener(this);
eable2.addActionListener(this);
eable3.addActionListener(this);
eable4.addActionListener(this);
// color in box for each decision
public void paint(Graphics g)
if (in1)
g.setColor(Color.red);
else if(out1)
g.setColor(Color.orange);
else if(can1)
g.setColor(Color.green);
else if(dis1)
g.setColor(Color.blue);
g.fillRect(150, 50, 100, 150);
g.setColor(Color.yellow);
g.fillRect(170, 50, 80, 125);
g.setColor(Color.black);
g.setFont(new Font ("Arial", Font.PLAIN, 12));
g.drawString(menu1[0] + state1, 150, 50);
     for (int i = 1; i < 4; i++)
     g.drawString(menu1[i] + pump1[i-1], 140, 100 + (i - 1) * 32);
     g.drawString("Pump 1", 140, 120);
//action ae
public void ActionPerformed(ActionEvent e)
if (e.getSource() == button1)
     if ( in1 == true )
                         out1 = true;
                         in1 = false;
                         can1 = false;
                         dis1 = false;
                         state1= "On";
     else
                         out1 = false;
                         in1 = true;
                         can1 = false;
                         dis1 = false;
                         state1= "Off";
else if ((e.getSource() == dsp1) && (can1== true))
     pump1[0]++;
     pump1[1] = pump1[2];
     state1= "pumping";
else if ((e.getSource() == eable1) && (in1 = true))
     in1 = false;
     out1 = true;
     can1 = true;
     dis1 = false;
     state1= "Enabled";
else if ((e.getSource() == dable1) && ( can1 = true))
     in1 = false;
     out1 = false;
     can1= false;
     dis1 = true;
     state1= "Disabled";
else if ((e.getSource() == buttonpress) && (in1 = true))
     pump1[2] = Integer.parseInt(pr1.getText());
     repaint();