Java 天地·Core Java·Lecture Notes·Unit 09 - Graphics- content

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Content Page # 21

Example of an applet displaying an image

You may recall the Zener card images from a previous unit. Consider this output from a simple applet:

The code for this applet is as follows:

import java.applet.Applet;

import java.awt.*;

public class Drawimage1 extends Applet
{

public void paint( Graphics g )
{

// retrieve copy of image and store in 'image'

image image = getimage( getCodeBase(), "zenerwaves.gif" );

// draw image in applet window

g.drawimage(image, 0, 0, this);

}

} // class

In the applet above the 2-argument version of the method getimage() has been used. Rather than getCodeBase(), we could have specified any URL for the directory where the image file is located. The message getCodeBase() will result in the applet object replying with the directory in which the " .class" object file is located.

Note that the image zenerwaves.gif is a GIF file that must be in the same directory as the compiled applet ‘.class’ file, in order for this applet for successfully load and display the image.

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