/* Stampa la data corrente */ import java.awt.*; import java.util.*; import java.text.*; public class DataOra extends java.applet.Applet implements Runnable { Thread runner; public void start() { if( runner==null ) { runner=new Thread(this); runner.start(); } } public void stop() { if( runner!=null ) { runner.stop(); runner=null; } } public void run() { while(true) { repaint(); try { Thread.sleep(200); } catch( InterruptedException e ) { } } } public void update(Graphics g) { Date now=new Date(); SimpleDateFormat dateformat = new SimpleDateFormat ("dd MMMM yyyy - HH:mm.ss"); Font f = new Font("TimesRoman", Font.PLAIN, 14); g.setFont(f); g.clearRect(10,0,500,40); g.drawString(dateformat.format(now),10,20); } public void paint(Graphics g) { update(g); } }
/* Scrive una stringa carattere per carattere */ import java.awt.*; public class SlowWrite extends java.applet.Applet implements Runnable { Thread runner; Font f; String towrite="Questa stringa viene scritta lentamente"; int writeto=0; public void start() { if( runner==null ) { runner=new Thread(this); runner.start(); } } public void stop() { if( runner!=null ) { runner.stop(); runner=null; } } public void run() { int i; for(writeto=0;; writeto=writeto+1) { writeto=writeto%towrite.length(); repaint(); if( towrite.charAt(writeto)!=' ' ) { try { Thread.sleep(200); } catch( InterruptedException e ) { } } } } public void paint(Graphics g) { f=new Font("Courier", Font.PLAIN, 18); int i; g.setFont(f); for(i=0; i<=writeto; i++) g.drawString(towrite.substring(i,i+1) , i*10, 20 ); } }
import java.awt.*; public class Ball extends java.applet.Applet implements Runnable { Thread runner; int x,y; public void start() { if( runner==null ) { runner=new Thread(this); runner.start(); } } public void stop() { if( runner!=null ) { runner.stop(); runner=null; } } public void run() { int i=0; for(x=0; x<=255; x++) { y=x; repaint(); try { Thread.sleep(100); } catch( InterruptedException e ) { } } } public void paint(Graphics g) { g.fillOval(x,y,20,20); } }