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Notice that no type arguments are specified In essence, this creates a Gen object whose type T is replaced by Object A raw type is not type safe Thus, a variable of a raw type can be assigned a reference to any type of Gen object The reverse is also allowed; a variable of a specific Gen type can be assigned a reference to a raw Gen object However, both operations are potentially unsafe because the type checking mechanism of generics is circumvented This lack of type safety is illustrated by the commented-out lines at the end of the program Let s examine each case First, consider the following situation:

CHAPTER 3 HELLO WORLD!

options { directory "/var/named"; // put config files in /var/named };

In this statement, the value of ob inside raw is obtained, and this value is cast to Integer The trouble is that raw contains a Double value, not an integer value However, this cannot be detected at compile time because the type of raw is unknown Thus, this statement fails at run time The next sequence assigns to a strOb (a reference of type Gen<String>) a reference to a raw Gen object:

The assignment, itself, is syntactically correct, but questionable Because strOb is of type Gen<String>, it is assumed to contain a String However, after the assignment, the object referred to by strOb contains a Double Thus, at run time, when an attempt is made to assign the contents of strOb to str, a run-time error results because strOb now contains a Double Thus, the assignment of a raw reference to a generic reference bypasses the type-safety mechanism The following sequence inverts the preceding case:

The preceding bind statement means that this is an option statement And the particular option here is the directive that specifies bind s working directory, ie, the directory on the local file system that will hold the name server s configuration data

Here, a generic reference is assigned to a raw reference variable Although this is syntactically correct, it can lead to problems, as illustrated by the second line In this case, raw now refers to an object that contains an Integer object, but the cast assumes that it contains a Double This error cannot be prevented at compile time Rather, it causes a run-time error Because of the potential for danger inherent in raw types, javac displays unchecked warnings when a raw type is used in a way that might jeopardize type safety In the preceding program, these lines generate unchecked warnings:

In the first line, it is the call to the Gen constructor without a type argument that causes the warning In the second line, it is the assignment of a raw reference to a generic variable that generates the warning

This section documents the most common statements you will see in a typical namedconf file The best way to tackle this is to give it a skim, but then treat it as a reference guide for later sections If some of the directives seem bizarre or don t quite make sense to you during the first pass, don t worry Once you see them in use in later sections, the hows and whys will quickly fall into place

Part I:

At first, you might think that this line should also generate an unchecked warning, but it does not:

Comments can be in one of the following formats: Format // /**/ # Indicates C++-style comments C-style comments Perl and UNIX shell script style comments

No compiler warning is issued because the assignment does not cause any further loss of type safety than had already occurred when raw was created One final point: You should limit the use of raw types to those cases in which you must mix legacy code with newer, generic code Raw types are simply a transitional feature and not something that should be used for new code

Figure 3-5. The Hello World! text is displayed in the preview box. Now, using the File menu, select Save, and use the Browse button to choose a location to save the file on your computer. Click the Save button when you are finished. After saving, connect SPOT to your computer, and upload the HelloWorld program. (If you re not familiar with how to upload a program, consult the Help documentation. Ideally, however, you should have worked through all the Robo Center or Robo Educator projects to familiarize yourself with this function.)