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The single most important factor that distinguishes a well-designed module from a poorly designed one is the degree to which the module hides its internal data and other implementation details from other modules A well-designed module hides all of its implementation details, cleanly separating its API from its implementation Modules then communicate with one another only through their APIs and are oblivious to each others' inner workings This concept, known as information hiding or encapsulation, is one of the fundamental tenets of software design [Parnas72] Information hiding is important for many reasons, most of which stem from the fact that it effectively decouples the modules that comprise a system, allowing them to be developed, tested, optimized, used, understood, and modified individually This speeds up system development because modules can be developed in parallel It eases the burden of maintenance because modules can be understood quickly and debugged with little fear of harming other modules While information hiding does not, in and of itself, cause good performance, it enables effective performance tuning Once a system is complete and profiling has determined which modules are causing performance problems (Item 37), those modules can be optimized without affecting the correctness of other modules Information hiding increases software reuse because individual modules do not depend on one another and frequently prove useful in contexts other than the one for which they were developed Finally, information hiding decreases the risk in building large systems; individual modules may prove successful even if the system does not The Java programming language has many facilities to aid information hiding One such facility is the access control mechanism [JLS, 66], which determines the accessibility of classes, interfaces, and members The accessibility of an entity is determined by the location where it is declared and by which, if any, of the access modifiers (private, protected, and public) is present in the entity's declaration Proper use of these modifiers is essential to information hiding The rule of thumb is that you should make each class or member as inaccessible as possible In other words, you should use the lowest possible access level consistent with the proper functioning of the software that you are writing For top-level (non-nested) classes and interfaces, there are only two possible access levels: package-private and public If you declare a top-level class or interface with the public modifier, it will be public; otherwise, it will be package-private If a top-level class or interface can be made package-private, it should be By making it package-private, you make it part of the package's implementation rather than its exported API, and you can modify it, replace it, or eliminate it in a subsequent release without fear of harming existing clients If you make it public, you are obligated to support it forever to maintain compatibility.

unless (optional) The name of a property that must not be set for this task to be executed For example, for a task to be executed only if the Ant build script is not being launched from Eclipse, you could use the ${eclipse running} property (see Section 19141, Predefined properties, on page 700):

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9-5 Write a class and associated functions to generate grades for students who take the course for pass/fail credit Assume that only the midterm and final grades matter, and that a student passes with an average exam score greater than 60 The report should list the students in alphabetical order, and indicate P or F as the grade 9-6 Rewrite the grading program for the pass/fail students so that the report shows all the students who passed, followed by all the students who failed 9-7 The read_hw function 413/57 solves a general problem (reading a sequence of values into a vector) even though its name suggests that it should be part of the implementation of Student_info Of course, we could change its name but suppose, instead, that you wanted to integrate it with the rest of the Student_info code, in order to clarify that it was not intended for public access despite its apparent generality How would you do so

One build target can explicitly call another build target in the same build script using the <antcall> task, or in a different build script using the <ant> task Alternatively, one target can depend on another target to achieve a similar effect, but only within the same build script If target A depends on target B, which in turn depends on target C (see Figure 19 1), then if you execute target A, the Ant framework will execute first target C, then target B, and finally target A This same effect could be achieved by having target A call target B, which in turn calls target C

we can use r <= rows if we want at least rows iterations-but what if we want to ensure that rows is the exact number Then we must test a more complicated condition, such as r == rows + 1 This extra complexity offers no compensating advantage

The difference between these two approaches lies in how many times a target is executed For example, let s assume a more complicated script in which A depends on B1, B2, and B3, and each of these depends on C In this case, if you execute A then the Ant framework will execute C first, then B1, B2, and B3 in some undetermined order, and finally A Note that in this case, target C was only executed once and not three times as you might expect

Build targets are composed of a sequence of tasks to be executed There are many different types of Ant tasks, some of which are listed on the next three pages In this list, tasks with names that start with eclipse are not built into Ant, but are available either as part of Eclipse or as plug-ins for Eclipse (see

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If a package-private top-level class or interface is used only from within a single class, you should consider making it a private nested class (or interface) of the class in which it is used (Item 18) This further reduces its accessibility It is, however, not as important to do this as it is to make an unnecessarily public class package-private because a package-private class is already part of the package's implementation rather than its API For members (fields, methods, nested classes, and nested interfaces) there are four possible access levels, listed here in order of increasing accessibility:

Section 1917, Ant extensions, on page 710) Much more complete documentation for Ant tasks can be found on the Apache Ant Web site (antapacheorg/) and in the Eclipse Help

ant Runs Ant on another build file For example:

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