An Application You Can Run
Of course, you will want to copy the following into NotePad, save it
to a file, compile and run it.
import java.awt.*;
import java.awt.event.*;
public class fahrConvert extends Frame implements ActionListener
{
Label title = new Label("Convert Fahrenheit to Celsius");
Label inLabel = new Label("Enter Fahrenheit");
Label outLabel = new Label("Celsius ");
TextField inFahr = new TextField( 7 );
TextField outCel = new TextField( 7 );
int fahrTemp ;
int celsTemp ;
fahrConvert() // constructor for fahrConvert
{
setLayout( new FlowLayout() ); // choose the layout manager
inFahr.addActionListener( this );
add( title );
add( inLabel );
add( outLabel );
add( inFahr );
add( outCel );
outCel.setEditable( false );
}
public void convert( )
{
celsTemp = ((fahrTemp-32) * 5) / 9;
}
public void actionPerformed( ActionEvent evt)
{
String userIn = inFahr.getText() ;
fahrTemp = Integer.parseInt( userIn ) ;
convert() ;
outCel.setText( celsTemp+" " );
repaint();
}
public static void main ( String[] args )
{
fahrConvert fahr = new fahrConvert() ;
WindowQuitter wquit = new WindowQuitter();
fahr.addWindowListener( wquit );
fahr.setSize( 200, 150 );
fahr.setVisible( true );
}
}
class WindowQuitter extends WindowAdapter
{
public void windowClosing( WindowEvent e )
{
System.exit( 0 ); // what to do for this event--exit the program
}
}
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