The latter tag encapsulates the HTML code required for running an applet.
You cannot call setVisible on a naked applet. What can we put into main? Normally, we make an object of the class and invoke setVisible(true) on it. Enumeration e = getAppletContext().getApplets() while (e.hasMoreElements()) (You learn more about enumeration objects in Volume 2.) Here is a loop that prints the class names of all applets on the current page. The getApplets method returns an enumeration object. You can also list all applets on a web page, whether or not they have a name attribute. What can you do with the reference? Provided you give the Chart class a method to accept new data and redraw the chart, you can call this method by making the appropriate cast. If the configuration calls for an external shared library to be loaded, that object is only ever loaded once. As of glibc version 2.33, this config file now reloads and reparses each time it changes, and only the configuration is reloaded. Then the call Applet chart1 = getAppletContext().getApplet("Chart1") Recent work behind the scenes in the GNU C library will change all of this. For example, if your HTML file contains the tag If you give name attributes to each applet in the HTML file, you can use the getApplet method of the AppletContext interface to get a reference to the applet. Naturally, this is an advanced technique that you probably will not need very often. If a web page contains multiple applets from the same codebase, they can communicate with each other. Inter-Applet CommunicationĪ web page can contain more than one applet. In addition to getAudioClip and getImage, the AppletContext interface contains several useful methods, which we discuss in the next few sections. You can think of the concrete implementation of the AppletContext interface as a communication path between the applet and the ambient browser.
That method returns an object that implements an interface of type AppletContext. To communicate with the browser, an applet calls the getAppletContext method. For example, if an applet running inside the applet viewer asks the applet viewer program to display a web page, nothing happens. The ambient browser can carry out these requests, or it can ignore them. An applet can ask the browser to do things for it, for example, fetch an audio clip, show a short message in the status line, or display a different web page.
An applet runs inside a browser or the applet viewer.