This is a very interesting applet program in which we are displaying a rolling banner like marquee tag in HTML. The banner message is passed in applet's <PARAM> tag.
PROGRAM
OUTPUT
C:\>javac ParamBanner.java
C:\>appletviewer ParamBanner.java
PROGRAM
import java.awt.*; import java.applet.*; /* <applet code="ParamBanner" width=300 height=50> <param name="message" value="Java makes the Web move!"> </applet> */ public class ParamBanner extends Applet implements Runnable { String msg; Thread t = null; int state; boolean stopFlag; // Set colors and initialize thread. public void init() { setBackground(Color.cyan); setForeground(Color.red); } // Start thread public void start() { msg = getParameter("message"); if(msg == null) msg = "Message not found."; msg = " " + msg; t = new Thread(this); stopFlag = false; t.start(); } // Entry point for the thread that runs the banner. public void run() { char ch; // Display banner for( ; ; ) { try { repaint(); Thread.sleep(250); ch = msg.charAt(0); msg = msg.substring(1, msg.length()); msg += ch; if(stopFlag) break; } catch(InterruptedException e) {} } } // Pause the banner. public void stop() { stopFlag = true; t = null; } // Display the banner. public void paint(Graphics g) { g.drawString(msg, 50, 30); } }
OUTPUT
C:\>javac ParamBanner.java
C:\>appletviewer ParamBanner.java
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