Problem in adding JButtons

[KiranJyothi]

Hi All,

I am trying to add buttons and I am not able to see them while running. Please let me know where I am going wrong.

Thanks in advance.

KiranJyothi

<CODE>
//KiranJyothi

import java.awt.GridBagLayout;
import javax.swing.*;
import java.awt.Component;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class AddButtons extends JFrame implements ActionListener
{
Color bgColor;
public JButton sendPacket, incSpeed, descSpeed, pause, reset, error, kill;

private boolean isError, isKill;

public AddButtons( boolean errorOccur, boolean killed )
{
bgColor = Color.PINK;
JButton sendPacket = new JButton("Transmit Packet");
sendPacket.setBackground(bgColor);
sendPacket.setActionCommand("snp");
sendPacket.addActionListener(this);

JButton kill = new JButton("Kill Packet");
kill.setBackground(bgColor);
kill.setActionCommand("kl");
kill.addActionListener(this);
kill.setEnabled(false);

JButton error = new JButton("Create Error");
error.setBackground(bgColor);
error.setActionCommand("err");
error.addActionListener(this);

JButton pause = new JButton("Pause");
pause.setBackground(bgColor);
pause.setActionCommand("paus");
pause.addActionListener(this);

JButton incSpeed = new JButton("Increase Packet Speed");
incSpeed.setBackground(bgColor);
incSpeed.setActionCommand("fast");
incSpeed.addActionListener(this);

JButton descSpeed = new JButton("Descrease Packet Speed");
descSpeed.setBackground(bgColor);
descSpeed.setActionCommand("slow");
descSpeed.addActionListener(this);


JButton reset = new JButton("Reset Animation");
reset .setBackground(bgColor);
reset.setActionCommand("rst");
reset.addActionListener(this);

add( sendPacket );
add( kill );
add( error );
add( pause );
add( incSpeed );
add( descSpeed );
add( reset );

isError = errorOccur;
isKill = killed;
}

public void setError( boolean errorOccur )
{
isError = errorOccur;
}

public boolean isErrorOccur()
{
return isError;
}

public void setKillPacket( boolean killed )
{
isKill = killed;
}

public boolean ifPacketKilled()
{
return isKill;
}

public void actionPerformed( ActionEvent event )
{//body}
}

//KiranJyothi

import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;
import java.awt.Color;

public class PacketComponent extends JComponent
{
int horizontalMove, verticleMove;

Color senderPacketColor, recieverPacketColor;

AddButtons buttons = new AddButtons( false, false );

public void paintComponent( Graphics g )
{
Graphics2D g2 = (Graphics2D) g;

horizontalMove = 0;
verticleMove = 0;

senderPacketColor = Color. BLUE;
recieverPacketColor = Color.CYAN;

buttons.draw(g2);

g2.drawString("Transmitter ", horizontalMove+10, verticleMove+80);

for( int count = 1; count <=20; count++ )
{
Packet sender = new Packet( false, false, false, false, 0, 0, horizontalMove+80, verticleMove+80, senderPacketColor );
horizontalMove +=40;
sender.draw( g2 );
}

horizontalMove = 0;
verticleMove = 0;

g2.setColor(Color.BLACK);
g2.drawString("Reciever ", horizontalMove+10, verticleMove+500);

for( int count = 1; count <=20; count++ )
{
Packet reciever = new Packet( false, false, false, false, 0, 0, horizontalMove+80, verticleMove+500, recieverPacketColor );
horizontalMove +=40;
reciever.draw( g2 );
}

}
}

//KiranJyothi

import javax.swing.*;

public class PacketTest
{
public static void main( String a[] )
{

JFrame frame = new JFrame();

final int FRAME_WIDTH = 1000;
final int FRAME_HEIGHT = 700;

frame.setSize( FRAME_WIDTH, FRAME_HEIGHT );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

PacketComponent component = new PacketComponent();
frame.add( component );

frame.setVisible( true );
}
}

</CODE>

[r035198x]

Read Sun's swing tutorial first. You are doing several things wrong there.

1.) You declare buttons as instance variables in your class, yet in the constructor you declare other buttons with the same variable names. That means your instance buttons are not available in the constructor.
2.) You need to read about and use a Layout manager for your Frame's contentPane. Find out from the tutorial which layout has been automatically used and what the consequences of that are.
3.) Your main method creates a Frame without any buttons on it at all. It should possibly have created an AddButtons instance?

e.t.c

[Nepomuk]

Hi All,

I am trying to add buttons and I am not able to see them while running. Please let me know where I am going wrong.

Thanks in advance.

KiranJyothi

<CODE>
...
</CODE>

And one little tip concerning this forum: the code tags are

[CODE] ... [/code]

not

<CODE> ... </CODE>

Greetings,
Nepomuk