just looked at SmsDemo.java and could not find any line importing java.net.*
Code:
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.io.*;
import net.rim.device.api.system.*;
import com.rim.samples.device.resource.*;
import net.rim.device.api.i18n.*;
import javax.microedition.io.*;
import java.util.*;
import java.io.*;
import javax.wireless.messaging.*;