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.GridBa gLayout;
import javax.swing.*;
import java.awt.Compon ent;
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("Transm it Packet");
sendPacket.setB ackground(bgCol or);
sendPacket.setA ctionCommand("s np");
sendPacket.addA ctionListener(t his);

JButton kill = new JButton("Kill Packet");
kill.setBackgro und(bgColor);
kill.setActionC ommand("kl");
kill.addActionL istener(this);
kill.setEnabled (false);

JButton error = new JButton("Create Error");
error.setBackgr ound(bgColor);
error.setAction Command("err");
error.addAction Listener(this);

JButton pause = new JButton("Pause" );
pause.setBackgr ound(bgColor);
pause.setAction Command("paus") ;
pause.addAction Listener(this);

JButton incSpeed = new JButton("Increa se Packet Speed");
incSpeed.setBac kground(bgColor );
incSpeed.setAct ionCommand("fas t");
incSpeed.addAct ionListener(thi s);

JButton descSpeed = new JButton("Descre ase Packet Speed");
descSpeed.setBa ckground(bgColo r);
descSpeed.setAc tionCommand("sl ow");
descSpeed.addAc tionListener(th is);


JButton reset = new JButton("Reset Animation");
reset .setBackground( bgColor);
reset.setAction Command("rst");
reset.addAction Listener(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.Graphi cs;
import java.awt.Graphi cs2D;
import javax.swing.JCo mponent;
import java.awt.Color;

public class PacketComponent extends JComponent
{
int horizontalMove, verticleMove;

Color senderPacketCol or, recieverPacketC olor;

AddButtons buttons = new AddButtons( false, false );

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

horizontalMove = 0;
verticleMove = 0;

senderPacketCol or = Color. BLUE;
recieverPacketC olor = 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 , senderPacketCol or );
horizontalMove +=40;
sender.draw( g2 );
}

horizontalMove = 0;
verticleMove = 0;

g2.setColor(Col or.BLACK);
g2.drawString(" Reciever ", horizontalMove+ 10, verticleMove+50 0);

for( int count = 1; count <=20; count++ )
{
Packet reciever = new Packet( false, false, false, false, 0, 0, horizontalMove+ 80, verticleMove+50 0, recieverPacketC olor );
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.setDefaul tCloseOperation ( JFrame.EXIT_ON_ CLOSE );

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

frame.setVisibl e( 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