Listing 5: A more elaborate Java applet

import java.applet.*;
import java.io.*;
import java.net.*;
import java.awt.*;

public class Simple extends Applet {

List      ItemList;

TextField Message;
Button    BtnOK;
Button    Btn;

Socket    SrvSock;

public void init() {

setLayout(new BorderLayout());

ItemList = new List( );
BtnOK    = new Button( "OK" );

add( "North", ItemList );

Panel p = new Panel( );
p.setLayout( new BorderLayout( ) );

add( "Center", p );

Panel p1 = new Panel( );
p1.setLayout( new FlowLayout( ) );

p1.add( "Left", new Button( "Left" ) );
p1.add( "Center", new Button( "Center" ) );
p1.add( "Right", new Button( "Right" ) );

p.add( "North", p1 );
p.add( "South", BtnOK );

Message = new TextField( );

p.add( "Center", Message );

}

public boolean action(Event evt, Object arg) {

if( evt.target instanceof Button ) {
String BtnName = ((Button)evt.target).getLabel( );

if( BtnName == "OK" ) {
InputStream MyInput;

try {
SrvSock = new Socket( "localhost", 13 );
}
catch( Exception e) {
e.printStackTrace( );
return true;
}

try {
MyInput = SrvSock.getInputStream( );
}
catch( Exception e) {
e.printStackTrace( );
return true;
}

byte NetDate[] = new byte[80];
char NetChar[] = new char[80];
int  NetRead;

try {
NetRead = MyInput.read( NetDate );
}
catch( Exception e) {
e.printStackTrace( );
return true;
}

int i = 0;

NetChar[NetRead] = (char)0;
while( NetRead > 0 ) {
NetChar[i] = (char)NetDate[i];
i++;
NetRead--;
}

String MsgTxt = new String( NetChar );
Message.setText( MsgTxt );

try {
SrvSock.close( );
}
catch( Exception e) {
e.printStackTrace( );
return true;
}

}
else {
ItemList.addItem( BtnName );
}
}

return true;

}
}