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The first version returns an Image object that encapsulates the image found at the location specified by url The second version returns an Image object that encapsulates the image found at the location specified by url and having the name specified by imageName

4:

Once you have an image, you can display it by using drawImage( ), which is a member of the Graphics class It has several forms The one we will be using is shown here: boolean drawImage(Image imgObj, int left, int top, ImageObserver imgOb) This displays the image passed in imgObj with its upper-left corner specified by left and top imgOb is a reference to a class that implements the ImageObserver interface This interface is implemented by all AWT components An image observer is an object that can monitor an image while it loads ImageObserver is described in the next section With getImage( ) and drawImage( ), it is actually quite easy to load and display an image Here is a sample applet that loads and displays a single image The file seattlejpg is loaded, but you can substitute any GIF, JPG, or PNG file you like (just make sure it is available in the same directory with the HTML file that contains the applet)

/* * <applet code="SimpleImageLoad" width=248 height=146> * <param name="img" value="seattlejpg"> * </applet> */ import javaawt*; import javaapplet*; public class SimpleImageLoad extends Applet { Image img; public void init() { img = getImage(getDocumentBase(), getParameter("img")); } public void paint(Graphics g) { gdrawImage(img, 0, 0, this); } }

superuser s (root s) home directory in Linux is usually set to /root (but for most variants of UNIX, such as Solaris, the home directory is traditionally /) An example of a special system service that might need a specific working directory could be a web server whose web pages are served from the /var/www/ directory In Linux, the decision to place home directories under /home is strictly arbitrary, but it does make organizational sense The system really doesn t care where we place home directories, so long as the location for each user is specified in the password file

In the init( ) method, the img variable is assigned to the image returned by getImage( ) The getImage( ) method uses the string returned by getParameter( img ) as the filename for the image This image is loaded from a URL that is relative to the result of getDocumentBase( ), which is the URL of the HTML page this applet tag was in The filename returned by getParameter( img ) comes from the applet tag <param name= img value= seattlejpg > This is the equivalent, if a little slower, of using the HTML tag <img src= seattlejpg width=248 height=146> Figure 25-1 shows what it looks like when you run the program

Part II:

When users log into the system, they expect an environment that can help them be productive This first program that users encounter is called a shell If you re used to the Windows side of the world, you might equate this with commandcom, Program Manager, or Windows Explorer (not to be confused with Internet Explorer, which is a web browser) Under UNIX/Linux, most shells are text-based A popular default user shell in Linux is the Bourne Again Shell, or BASH for short Linux comes with several shells from which to choose you can see most of them listed in the /etc/shells file Deciding which shell is right for you is kind of like choosing a favorite beer what s right for you isn t right for everyone, but still, everyone tends to get defensive about their choice! What makes Linux so interesting is that you do not have to stick with the list of shells provided in /etc/shells In the strictest of definitions, the password entry for each user doesn t list what shell to run so much as it lists what program to run first for the user Of course, most users prefer that the first program run be a shell, such as BASH

FIGURE 25-1

Figure 11-26. The bottom VARIABLE block s configuration panel (inside loop)