Punem puncte pe ecran

import java.applet.*;
import java.awt.*;

public class index extends Applet{
final int MAXPETE=100;

int xpete[]=new int[MAXPETE];
int ypete[]=new int[MAXPETE];
int patacrt=0;

public void init(){
setBackground(Color.white);
}
public boolean mouseDown(Event evt,int x,int y){
if(patacrt < MAXPETE){
adaugapete(x,y);
return true;
}
else{
return false;
}
}
void adaugapete(int x,int y){
xpete[patacrt]=x;
ypete[patacrt]=y;
patacrt++;

repaint();
}
public void paint(Graphics g){
g.setColor(Color.blue);
for(int i=0 ; i < patacrt;i++){
g.fillOval(xpete[i]-10,ypete[i]-10,20,20);
}
}
}