fails to compile :(

Hi.. im having a problem compiling my program... would really appriciate some help!
here's the code

"

import java.awt.*;
import java.net.URL.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import java.io.*;




public class Line extends JApplet {
int lasty=0;
int lastx=0;
int biggest=0;
int yintervall;
int punktery[]=new int[5];
StringBuffer buff;
String apa = "a";
String skilj ="|";
int b=0;


public void paint(Graphics g) {

try {
URL u=new URL("http://www.sweform.com/graf_data.txt");
BufferedReader in = new BufferedReader(new InputStreamReader(u.openStream()));
buff=new StringBuffer();
String line;
while ((line = in.readLine()) != null)
buff.append(line);
in.close();

} catch (MalformedURLException e) {}

int end,start=0;
for(int i=0; i<punktery.length; i++) {
start=buff.indexOf(skilj,start);
end=buff.indexOf(skilj,start);
String mini=buff.substring((start+1),end);
int convInt= new Integer(mini).intValue();
punktery[i]=convInt;

if(punktery[i]>biggest)
biggest=punktery[i];
}

yintervall=biggest/6;

Graphics2D g2 = (Graphics2D) g;

g2.draw(new Line2D.Double(10, 0,
10, 180));
g2.draw(new Line2D.Double(10, 180,
180, 180));

for(int i=0; i<180; i+=30)
g.drawString(apa, 0, i);

Integer c=new Integer(b);
for(int i=10; i<180; i+=30) {
g.drawString(c.toString(), i, 190);
b++;
c=new Integer(b);
}


for(int i=0; i<punktery.length; i++) {
g2.draw(new Line2D.Double(10+lastx, (180-lasty),
10+i, (180-punktery[i])));
lasty=punktery[i];
lastx=i;
}

}
}

"

the compiler gives me the following errors

line.java:26: cannot resolve symbol
symbol : class URL
location: class Line
URL u=new URL("http://www.sweform.com/graf_data.txt");
^
line.java:26: cannot resolve symbol
symbol : class URL
location: class Line
URL u=new URL("http://www.sweform.com/graf_data.txt");
^
line.java:34: cannot resolve symbol
symbol : class MalformedURLException
location: class Line
} catch (MalformedURLException e) {}
^
3 errors

You have to import java.net.*, as the URL and MalformedURLException classes are defined in that package.

thanks!
it does compile now however im not sure that the code extracts the numbers between the "|" signs (check the url in the code).... is the code correct?