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C1 2 0 41.35U C2 2 1 160U R1 1 0 2.2 I1 0 2 AC 1 PULSE 0 11 0.1U 0.1U 0.1U 5U 10U L1 0 2 434U IC=-5.5 .END

(possibly with help from the user).

Checked exceptions are only for truly exceptional conditions. Do not use exceptions for flow control! Well, not if you hope to do well

Problem 21 A battery of constant 24 volts is applied to the series-parallel network shown below. Resistance values in ohms. Find the battery current. (Answer: 2.97497 amps)

both on the exam and in real life. Remember, checked exceptions sure don t come for free at runtime; they ve got overhead. Use them when, but only when, you need them.

Problem 22 Given the series-parallel network as follows, resistance values in ohms, nd:

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Make use of standard exceptions when they make sense, but never hesitate to create your own if appropriate. If there s a reasonable chance that an exceptional condition can be recovered from, then use a checked exception and try to handle it. Normally, the exceptions that you create can be thought of as Business Exceptions in other words, things like RecordLockedException or InsufficientSearchCriteriaException . The more specific your exception, the more easily your code can handle it, and you get the benefit of providing specific catch blocks, thus keeping the granularity of your catch blocks useful. The opposite of that strategy would be to simply have everything in one big try block that catches Exception (or worse, Throwable!).

R1 2.2

Say you catch an SQLException (not likely on the Developer exam). Do you throw this back to a client Of course not. For a client, it falls into the category of too

(a) (b)

much information. The client should not know or care that the database server happens to be using SQL. Instead, throw back to the client a more meaningful custom business exception that he or she can deal with. That more meaningful business exception is defined in your public interface, so the client is expecting it as a possibility. But simply passing a low-level exception all the way to a client reflects a poor design, since it couples the client with implementation details of the server that s never a good idea in an OO design.

Make Your Exception Classes with a String Constructor (As Well As a no-arg) for Providing Additional Meaning

Problem 23 What value of resistance must be connected in parallel with a 36-ohm resistor if the parallel combination is to be equivalent to a single 20-ohm resistor

Every Exception class you develop should have both a no-arg constructor and a constructor that takes a String. Exception inherits a getMessage() method from Throwable, and it returns the String of that message, so you can pass that message back to your super constructor and then the catcher can query it for more information. The message s main use, however, is to provide more information in the stack trace. So the more detailed your message (usually about the state of key parts of the system at the time the Exception occurs), the more helpful it will be in diagnosing the problem.

I(V1) L1[I]

* The term ground is often used to denote a common reference point or reference line in a network. Such a ground may or may not be connected to an actual earth ground.

By eat we mean the following horrible practice:

try { doRiskyThing(); } catch(Exception e) {}

The purpose of this chapter is to prepare us for future work in the writing and solution of network equations. We ll nd that network analysis produces systems of simultaneous equations, and such systems are most conveniently handled by making use of what are called determinants. The study of determinants is not basically di cult, but it will call for close attention to details on your part. The results, however, will be well worth the time and e ort you put into it. Let us begin with some de nitions, as follows. A determinant is a square array of numbers, or letters used to represent numbers, placed between two vertical bars. The numbers or letters are arranged in horizontal rows and vertical columns. An example of what a determinant looks like is shown in Fig. 35. Notice that the rows are numbered from the top down, and the columns from left to right.

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