PLEAS help opening a frame when clicking a button

Question

i have a applet and when i click on a button it opens a frame. i have atried a couple of things but the frame does not open. Can anybody Please help
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class mainscreen1 extends Applet implements ItemListener, ActionListener
private Image layout1;
private int frame;
private int xpos,ypos,xdir,ydir;
public TextField tn, tt1, tt2, total;
public int value, ticketnum, sum;
public Label title, seat, need, payable;
public Button b1, b2;
Mydialog1 d;
public void init()
     setBackground(Color.pink);
setSize (600, 460);
setLayout(null);
     xpos = getSize().width/-1400;
     ypos = getSize().height/12;
     layout1 = getImage(getDocumentBase(),"layout1.gif");
title=new Label("Almeida Theater booking system");
     title.setBounds(150,0,185,30);
     add(title);
seat=new Label("Please choose a seating location:");
     seat.setBounds(300,40,190,25);
     add(seat);
payable=new Label("Total Payable:�");
     payable.setBounds(300,390,100,30);
     add(payable);
     need=new Label("Please enter the number of seats needed:");
     need.setBounds(300,180,245,30);
     add(need);
     CheckboxGroup radio = new CheckboxGroup();
     Checkbox Stalls = new Checkbox("Stalls", true, radio);
     Stalls.setBounds(490,40,60,25);
     add(Stalls);
     Stalls.addItemListener(this);
     Checkbox Balcony = new Checkbox("Balcony", false, radio);
     Balcony.setBounds(490,65,65,25);
     add(Balcony);
     Balcony.addItemListener(this);
     Checkbox Concessions = new Checkbox("Concessions", false, radio);
     Concessions.setBounds(490,90,94,25);
     add(Concessions);
     Concessions.addItemListener(this);
Button b1=new Button("Quote");
     b1.setBounds(20,395,80,30);
     add(b1);
     b1.addActionListener( this );
     Button b2=new Button("Confirm booking");
     b2.setBounds(110,395,100,30);
     add(b2);
     b2.addActionListener( this );
     tt1=new TextField(60);
     tt1.setBounds(300,250,270,30);
add(tt1);
     tt1.addActionListener(this);
     tt2=new TextField(60);
     tt2.setBounds(300,300,150,30);
     add(tt2);
     tt2.addActionListener(this);
     tn=new TextField(3);
     tn.setBounds(545,180,30,30);
     add(tn);
     tn.addActionListener(this);
     total=new TextField(5);
     total.setBounds(400,390,45,30);
     add(total);
     total.addActionListener(this);
public void itemStateChanged(ItemEvent e)
     String c1 = (String) e.getItem();
     if (c1 == "Stalls")
          value = 20;
     else if (c1 == "Balcony")
          value = 15;
     else
          value = 10;
     tt1.setText("You have chosen to sit in the " + c1 + " area");
     tt2.setText("Each seat will cost: �" + value);
     repaint();
public void actionPerformed ( ActionEvent e )
if( e.getActionCommand() == "Quote" )
     //String sum = (String) e.getItem();
//sum = value*ticketnum;
     //Ssumtotal
     //total.setText(sum);
else if( e.getActionCommand() == "Confirm booking")
d = new Mydialog1(new Frame());
          ticketnum = Integer.parseInt(tn.getText());
          repaint();
     public void paint(Graphics g)
          g.setColor(Color.black);
          g.drawString ("You have chosen:" + ticketnum +" seats", 300, 365);
          g.drawImage(layout1,xpos,ypos,null);
Above is the 1st screen and when i click
confirm booking it don't open the frame, which is below:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Mydialog1 extends Frame implements ActionListener
public Label title;
public Button b1, b2;
public void init()
     setBackground(Color.pink);
setSize (600, 460);
setLayout(null);
     setLocation(320,140);
     setVisible(true);
     Mydialog1(Frame f);
title=new Label("Almeida Theater booking system");
     title.setBounds(150,0,185,30);
     add(title);
     Button b1=new Button("Close");
     b1.setBounds(20,395,80,30);
     add(b1);
     b1.addActionListener( this );
     Button b2=new Button("Proced with booking");
     b2.setBounds(110,395,100,30);
     add(b2);
     b2.addActionListener( this );
public void actionPerformed( ActionEvent e )
if( e.getActionCommand() == "Close" )
this.dispose();
else if( e.getActionCommand() == "Proced with booking")
setBackground(Color.blue);
Can anyone help also can anyone explain how i do calcualtions on the mainscreen.calss. the bit that says Quote. it has // cos i canot get it to work
PLEASE PLEASE

Answer 1

no, you dont have to create a new class.
here is your own code. This time we pass the parameters to another method, and
not the constructor.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class mainscreen1 extends Applet implements ItemListener, ActionListener
private Image layout1;
private int frame;
private int xpos,ypos,xdir,ydir;
public TextField tn, tt1, tt2, total;
public int value, ticketnum, sum;
public Label title, seat, need, payable;
public Button b1, b2;
Mydialog1 d;
String c1;                   // obs
public void init()
setBackground(Color.pink);
setSize (600, 460);
setLayout(null);
xpos = getSize().width/-1400;
ypos = getSize().height/12;
layout1 = getImage(getDocumentBase(),"layout1.gif");
title=new Label("Almeida Theater booking system");
title.setBounds(150,0,185,30);
add(title);
seat=new Label("Please choose a seating location:");
seat.setBounds(300,40,190,25);
add(seat);
payable=new Label("Total Payable:�");
payable.setBounds(300,390,100,30);
add(payable);
need=new Label("Please enter the number of seats needed:");
need.setBounds(300,180,245,30);
add(need);
CheckboxGroup radio = new CheckboxGroup();
Checkbox Stalls = new Checkbox("Stalls", true, radio);
Stalls.setBounds(490,40,60,25);
add(Stalls);
Stalls.addItemListener(this);
Checkbox Balcony = new Checkbox("Balcony", false, radio);
Balcony.setBounds(490,65,65,25);
add(Balcony);
Balcony.addItemListener(this);
Checkbox Concessions = new Checkbox("Concessions", false, radio);
Concessions.setBounds(490,90,94,25);
add(Concessions);
Concessions.addItemListener(this);
Button b1=new Button("Quote");
b1.setBounds(20,395,80,30);
add(b1);
b1.addActionListener( this );
Button b2=new Button("Confirm booking");
b2.setBounds(110,395,100,30);
add(b2);
b2.addActionListener( this );
tt1=new TextField(60);
tt1.setBounds(300,250,270,30);
add(tt1);
tt1.addActionListener(this);
tt2=new TextField(60);
tt2.setBounds(300,300,150,30);
add(tt2);
tt2.addActionListener(this);
tn=new TextField(3);
tn.setBounds(545,180,30,30);
add(tn);
tn.addActionListener(this);
total=new TextField(5);
total.setBounds(400,390,45,30);
add(total);
total.addActionListener(this);
public void itemStateChanged(ItemEvent e)
c1 = (String) e.getItem();
if (c1 == "Stalls")
value = 20;
else if (c1 == "Balcony")
value = 15;
else
value = 10;
tt1.setText("You have chosen to sit in the " + c1 + " area");
tt2.setText("Each seat will cost: �" + value);
repaint();
public void actionPerformed ( ActionEvent e )
  if( e.getActionCommand() == "Quote" )
    //String sum = (String) e.getItem();
    //sum = value*ticketnum;
    //Ssumtotal
    //total.setText(sum);
  else if( e.getActionCommand() == "Confirm booking")
    int nr_seats = Integer.parseInt(tn.getText());
    total.setText("" +nr_seats*value);
    d = new Mydialog1();
    d.set_text(c1, nr_seats); // pass the c1 and the nr_seats vriables to the
                              //  set_text method in the Mydialog1 class.
  ticketnum = Integer.parseInt(tn.getText());
  repaint();
public void paint(Graphics g)
g.setColor(Color.black);
g.drawString ("You have chosen:" + ticketnum +" seats", 300, 365);
g.drawImage(layout1,xpos,ypos,null);
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Mydialog1 extends Frame implements ActionListener
  public Label title;
  public Button b1, b2;
  TextField tf; ///***/
  public Mydialog1()
    setBackground(Color.pink);
    setSize (600, 460);
    setLayout(null);
    setLocation(320,140);
    //Mydialog1(Frame f);
    title=new Label("Almeida Theater booking system");
    title.setBounds(150,0,185,30);
    add(title);
    Button b1=new Button("Close");
    b1.setBounds(20,395,80,30);
    add(b1);
    b1.addActionListener( this );
    Button b2=new Button("Proced with booking");
    b2.setBounds(110,395,100,30);
    add(b2);
    b2.addActionListener( this );
    tf = new TextField();                    //new
    tf.setBounds(230, 395, 100,30);   //new
    add(tf);                                       //new
    setVisible(true);
  public void actionPerformed( ActionEvent e )
    if( e.getActionCommand() == "Close" )
      this.dispose();
    else if( e.getActionCommand() == "Proced with booking")
      setBackground(Color.blue);
   *  Folowing method can take two parameters. One string and one int.
  public void set_text ( String seat_type, int nr_seats ) 
    tf.setText (seat_type +". "  +nr_seats);
}