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Figure 11-7. A LOOP block set to Forever When you configure a LOOP block to run forever, that s exactly what will happen: any blocks inside the loop will run over and over again until you cancel the program or the batteries give out. Now click the drop-down menu in the Control section, and select Sensor; next, click the drop-down menu in the Sensor section to see the drop-down menu shown in Figure 11-8.

Sometimes a single line of text input is not enough for a given task To handle these situations, the AWT includes a simple multiline editor called TextArea Following are the constructors for TextArea: TextArea( ) throws HeadlessException TextArea(int numLines, int numChars) throws HeadlessException TextArea(String str) throws HeadlessException TextArea(String str, int numLines, int numChars) throws HeadlessException TextArea(String str, int numLines, int numChars, int sBars) throws HeadlessException

FIGURE 24-7

3:

Part II:

Here, numLines specifies the height, in lines, of the text area, and numChars specifies its width, in characters Initial text can be specified by str In the fifth form, you can specify the scroll bars that you want the control to have sBars must be one of these values:

And to create /dev/nst0, we would use this command:

TextArea is a subclass of TextComponent Therefore, it supports the getText( ), setText( ), getSelectedText( ), select( ), isEditable( ), and setEditable( ) methods described in the preceding section TextArea adds the following methods: void append(String str) void insert(String str, int index) void replaceRange(String str, int startIndex, int endIndex) The append( ) method appends the string specified by str to the end of the current text insert( ) inserts the string passed in str at the specified index To replace text, call replaceRange( ) It replaces the characters from startIndex to endIndex 1, with the replacement text passed in str Text areas are almost self-contained controls Your program incurs virtually no management overhead Text areas only generate got-focus and lost-focus events Normally, your program simply obtains the current text when it is needed The following program creates a TextArea control:

// Demonstrate TextArea import javaawt*; import javaapplet*; /* <applet code="TextAreaDemo" width=300 height=250> </applet> */ public class TextAreaDemo extends Applet { public void init() { String val = "Java SE 6 is the latest version of the most\n" + "widely-used computer language for Internet programming\n" + "Building on a rich heritage, Java has advanced both\n" + "the art and science of computer language design\n\n" + "One of the reasons for Java's ongoing success is its\n" + "constant, steady rate of evolution Java has never stood\n" + "still Instead, Java has consistently adapted to the\n" + "rapidly changing landscape of the networked world\n" + "Moreover, Java has often led the way, charting the\n" + "course for others to follow"; TextArea text = new TextArea(val, 10, 30); add(text); } }

Another choice for creating device names is to use the scsidev program This will create device entries under the /dev/scsi directory that reflect the current state of your SCSI hardware, with the appropriate device type (block or character) and corresponding major and minor numbers This method, unfortunately, has yet another naming scheme The naming scheme for tape devices created using scsidev is as follows:

24:

Figure 11-8. A LOOP block configured for Sensor input As you can see, the Sensor section s drop-down menu offers,many options, including Light Sensor, NXT Buttons, Receive Message, Rotation Sensor, Sound Sensor, Timer, Touch Sensor, Color Sensor, and Ultrasonic Sensor. Most of these were covered in 9 and are easy to use. What you are doing when you select one of these options is configuring the trigger that will break the loop. For example, in Figure 11-9, I have selected the NXT Buttons options from the Sensor section dropdown menu.

where A is the host number, B is the channel number, T is the target ID, and L is the logical unit (lun) number All the different naming schemes may seem frustrating, which is understandable The key to all of them, however, is that they are still using the same major and minor