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A list is a collection of elements that are accessible sequentially: the first element, followed by the second element, followed by the third element, and so on. This is called sequential access or linked access (as opposed to direct or indexed access). A good example is a line of train cars on a track: To get to the fourth car from the first car, you have to go through the second and third cars in that order. This example also illustrates how insertions and deletions are managed in a list. The only changes needed are to the two cars that are adjacent to location where the insertion or deletion is made. None of the other cars is affected. THE JCF List INTERFACE The List interface specified by the Java Collections Framework is outlined on page 85. It adds 10 methods to the 15 methods specified by the Collection interface that it extends. From the JCF inheritance hierarchy shown in Figure 4.1 on page 70, you can see that the Queue, Deque, and Set interfaces all extend the List interface. Consequently, all of the List, Queue, Deque, and Set classes implement the List interface. This includes the concrete classes outlined in 4: ArrayList, Vector, LinkedList, PriorityQueue, ArrayDeque, EnumSet, HashSet, LinkedHashSet, and TreeSet. As Table 4.1 on page 70 shows, the JCF provides both linked and indexed implementations of the List interface: the LinkedList class uses sequential access, while the ArrayList class provides direct access. EXAMPLE 7.1 Testing a List Class

CHAP. 6]

Applying KCL at node E gives ie ib hfe ib hoe vec hfe 1 ib hoe vec Comparison of (1) and (2) above with (3) and (4) of Problem 6.13 yields, by direct analogy, hic hie hrc 1 hre hfc hfe 1 hoc hoe 3 2

This program illustrates some of the methods specified by the List interface:

Java also provides the concept of an interface, which makes it possible to enforce similar behavior across different classes Error handling in Java is accomplished using Exception objects When an error occurs, a program can throw an Exception, which can describe the problem Exceptions can be caught within the application when the code generating the Exception is enclosed in a try block Following the try block can be multiple catch blocks and a finally block Catch blocks can specify which subclasses of Exception they will handle Code in a finally block will always be executed, whether an error occurs in the try block or not If the application does not catch an Exception, the Exception will propagate up to the JVM, which will handle the Exception by reporting it and terminating the program Input and output in Java occurs using streams A stream is a sequence of data elements.

Use the CC transistor model of Fig. 6-16 to nd the Thevenin equivalent for the circuit to the right of terminals B; C in Fig. 6-2(b), assuming hrc % 1 and hoc % 0. Compare the results with (6.16) to determine relationships between hie and hic , and between hfe and hfc .

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

The circuit to be analyzed is Fig. 6-16 with a resistor RE connected from E to C. With terminal pair B; C open, the voltage across terminals C; E is zero; thus, the Thevenin equivalent circuit consists only of ZTh RTh . Now consider vbc as a driving-point source, and apply KVL around the B; C loop to obtain vdp vbc hic ib hrc vec % hic ib vec Use KCL at node E to obtain vec ie RE hfc ib hoc vce RE % hfc RE ib Substitute (2) into (1), and solve for the driving-point impedance: RTh vbc hic hfc RE ib 3 2 1

The many types of streams available in Java can be classified into Input/OutputStreams, which handle raw binary data as bytes, and Reader / Writer streams which handle character data, and automatically perform translations to and from character encodings For efficiency, good programming practice is to wrap a base stream object in a buffered stream to provide efficient buffering of I/O The Scanner class in Java is a handy class for reading text from the keyboard, a file, or other input stream The PrintWriter class is another convenience class that facilitates the common task of writing formatted text to a file REVIEW QUESTIONS 51 Write a Java program that divides the number 743 by 126 and reports the result of the division Store the dividend and divisor in variables named dividend and divisor before performing the division.

public class TestStringList { public static void main(String[] args) { List<String> list = new ArrayList<String>(); Collections.addAll(list, "GB", "DE", "FR", "ES"); System.out.println(list); list.add(3, "DE"); System.out.println(list); System.out.println("list.get(3): " + list.get(3)); System.out.println("list.indexOf(\"DE\"): " + list.indexOf("DE")); System.out.println("list.indexOf(\"IE\"): " + list.indexOf("IE")); System.out.println("list.subList(1, 5): " + list.subList(1, 5)); list.remove("DE"); System.out.println(list); } }

Now (3) is compared with (6.16), it becomes apparent that hic hie and hfc hfe 1 , as given in (3) of Problem 6.14.

The output is: