User-defined parameters can be passed to an applet using the tags.

Hello World

import java.awt.*; import java.applet.*; public class ParamTest extends Applet { String str; public void init() { str=getParameter("String"); setBackground(Color.yellow); setForeground(Color.red); } public void paint(Graphics g) { super.paint(g); g.drawString(str,20,20); }

 The signature of the method getDocumentBase() defined by Applet class is: public URL getDocumentBase()  The method getDocumentBase() gets the URL of the document in which this applet is embedded.  For example, suppose an applet is contained within the document:  The document base is:

 The signature of the getCodeBase method is ◦ public URL getCodeBase()  The method gets the base URL. This is the URL of the directory which contains this applet

/* */ import java.awt.*; import java.applet.*; import java.net.*; Public class URLDemo extends Applet { publicvoid paint(Graphics g){ String msg; URL url=getCodeBase(); msg = "Code Base : "+url.toString(); g.drawString(msg,10,20); url=getDocumentBase(); msg="Document Base : "+url.toString(); g.drawString(msg,10,40); }

 Defined in the Applet Context interface.  showDocument(URL) – Displays the document represented by the URL  showDocument(URL,where) Displays the document represented by the URL at the location specified by where

 Applet Context is an interface that is defined in the java.applet package.  It is used by an applet to obtain information from the applet's environment through its methods.  Using methods of this interface, we can transfer control to another document.

 Rich class of graphics methods defined in the awt package.  Can be drawn relative to a window.  The origin of each window is at the top-left corner and is 0,0.  Coordinates are specified in pixels.

MethodsDescription drawLine(int sX, int sY, int eX, int sY) Draw a line from (sX, sY) to (eX, eY) void drawRect(int top, int left, int width, int height) Draws a rectancle void drawOval(int top, int left, int width, int height) Draw an oval inside a rectangle whose dimensions are given void drawPolygon(int x[ ], int y[ ], int numPoints) Draws a polygon whose points are defined by the arrays of x and y. total no. of points given by numPoints