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order is not the same as the order in which the elements were added to the collection. Since the collection is a set, its elements have no intrinsic order. It is the iterator itself that computes the traversal sequence. You can see from the output from line 5 that the toString() method (invoked implicitly by the println() method) uses the same traversal sequence, obviously using its own iterator to build the string. The it1 iterator s remove() method is invoked at lines 11 and 14. This causes it to delete the current element, which in each case is the last element returned by a call to next(). At line 11, the last next() call was at line 10, which returned the MO element; so MO is deleted by remove() at line 11. Similarly, at line 14, the last next() call was at line 13, which returned the GW element; so GW is deleted by remove() at line 14. These deletions are evident from the output produced by the while loop at lines 17 19. Notice that that loop uses the independent iterator it2 to traverse the collection. Note that the code at lines 16 19 make a complete traversal of the collection. This is guaranteed by the instantiation of the new iterator at line 16 and the use of the hasNext() method to control the loop. The last output, generated at line 21, confirms that the two iterators it1 and it2 are independent. The action of it2 had no effect on it1, which returns the CV element at line 21.

Fig. 4-26

displayed by Fig. 4-26, where vGS may be either positive or negative. Construct a transfer characteristic for the drain characteristics of Fig. 4-26, and clearly label the regions of depletion-mode and enhancement-mode operation.

#! /bin/sh # Script gradeP for grading the access_log projects # Variables: # $1 student s output file # $2 comments/grading file to be created by # program gradeProjpl # $3 student s source code # $4 access_log_extract-report # $5 path to student s directory # $6 Name # Run the grading program against the student s output file gradeProjpl $6 $5$1 $5$2 # Test the student s program against the extract file $5$3 /home/fac/chr/public_html/plc/access_log_extract $5$4 # Print the results nenscript -2 -r $5$2 $5$1 $5$3 $5$4 This script is a script in the Bourne shell (command interpreter) for Unix, and it flexibly executes a set of commands that otherwise would require much more typing and be much more prone to errors of execution.

CHAP. 4]

If a constant value of vDS VGSon 4 V is taken as indicated by the broken line on Fig. 4-26, the transfer characteristic of Fig. 4-27 results. vGS 0 is the dividing line between depletion- and enhancementmode operation.

The iterator it2 in Example 4.6 used a while loop to traverse the collection. Iterators can be used in a for loop the same way:

Fig. 4-27

The first line, the one beginning with #! (called a shebang), tells Unix to execute the commands in the file using the program sh, also known as the Bourne shell The lines beginning with # are comment lines The remaining lines are commands whose parameters are constructed from the variables defined by the original command line arguments The Bourne shell scripting language is one of many scripting languages one can categorize as job control language (JCL) scripting languages Others include the C shell (csh), the Korn shell (ksh), Bash (Bourne Again SHell), JCL and JES2 (IBM s languages for mainframes), and MS-DOS Batch They are all similar in that they can accept a file of commands as input, incorporate values of parameters available at execution time, and execute the sequence of commands.

for (Iterator it = countries.iterator(); it.hasNext(); ) { System.out.printf("%s ", it.next()); } This is analogous to using a for loop to traverse an array: for (int i = 0; i < countries.length; i++) { System.out.printf("%s ", countries[i]); } Java 5.0 introduced the for-each construct for simplifying for loops: for (String country : countries) { System.out.printf("%s ", country); } Here, the String variable country takes the place of the indexed expression countries[i].

A common-gate JFET ampli er is shown in Fig. 4-28. The JFET obeys (4.2). If IDSS 10 mA, Vp0 4 V; VDD 15 V; R1 R2 10 k ; RD 500 , and RS 2 k , determine (a) VGSQ , (b) IDQ , and (c) VDSQ . Assume iG 0.

This same code also replaces the iterator loop! Thus, the program in Example 4.6 works the same way if we replace lines 16 19 with this simpler for-each loop:

Fig. 4-28

Except for JCL and JES2, they all have limited programming controls as well, and include conditional expressions and the ability to loop and branch during execution of the command file Here s an example MS-DOS Batch file that will copy a list of files to a directory called DUPLICAT Lines beginning with twin colons are comment lines Lines beginning with a single colon are labels referred to by other statements Note the conditional statement that creates the directory only if it does not already exist Also note the looping structure using the GOTO statement with the COPY-FILES label..