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import java.awt.*; import java.util.*; /** Could be compiled on JDK 1.2, before java.util.List was created */ public class VList extends List { Vector v; } This compiled without a problem in Java 1.1, but as soon as Java 1.2 appeared, the code snippet became invalid. Java 1.2 introduced new collection classes, among them java.util. List. As a result, the class name List became ambiguous in the preceding code snippet, as it can mean java.awt.List (as during the Java 1.1 compilation) as well as java.util.List. In short, adding new classes into existing packages isn t source compatible. You can see that adding new methods to classes can cause source incompatibility and that adding new classes can also cause incompatibility. Removing methods or classes is incompatible, so what can you do Never make any changes at all Give up on source compatibility Faced with this dilemma, giving up on source compatibility is probably the better choice. Of course, trying hard to make sources compilable with a new version if they could be compiled with previous version of an API is a reasonable goal, but as has been shown, it s difficult and can be broken by syntactic language additions such as wildcard imports. That s why it doesn t make sense to try too much to ensure absolute source compatibility in Java. The language isn t designed to extensively support source compatibility. It has different goals, and if someone is recompiling from source anyway, it isn t that hard to fix mistakes. For example, replacing wildcard imports with explicit ones is relatively easy.

Trim off a few short pieces of single-core cable and use it to link the center (data) pin of each connector to the matching digital I/O line. The assignments we used are as follows: sensor A = digital 3 sensor B = digital 4 sensor C = digital 5 sensor D = digital 6 sensor E = digital 7 sensor F = digital 8 Notice that we skipped the first few pins and started at digital pin 3. Pins 0 and 1 are used for the serial connection (USB) to the host, and pin 2 is used by the Ethernet shield itself to communicate with the Arduino. Many shields use pin 2 because it s a special pin associated with an interrupt on the Arduino. We installed each wire, in turn, by inserting it from the top of the shield into the center hole behind the connector and bending the end across to join with the connector pin, then guiding the rest of the wire to the appropriate digital connection, and finally soldering both ends from underneath the shield. The result is shown in Figure 7-5.

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You can achieve binary compatibility if any program compiled with a previous version of a library can be linked with newer versions of the API without recompilation. This is a useful goal, as it supports two scenarios. First, you can write an application and then compile it with one version of the library, while letting people use it with any other version. This greatly simplifies maintenance, packaging, and distribution of an application. Second, it allows a user who only has the binary, built against the older version of the library, to migrate to the new library version without waiting for someone to recompile the application. Both these scenarios are desirable and useful as they increase the flexibility of configuration and give module writers and users more freedom. To achieve this level of interoperability, you should understand at least a bit of the binary format to which the sources are compiled. In the case of Java, this means understanding the format of the class file and the way it is loaded into the Java Virtual Machine (JVM). The next paragraphs give an overview and highlight some of the differences between source and binary compatibility. The .class file format is close to but not the same as the original source code. The first difference to note is that the problem with wildcard imports experienced by source compatibility is gone, because all names in a class file are fully qualified. Also, the name of a field or method contains not just the name expressed in the source, but is also annotated with the actual type of the method or the field. For a method, this means the types of all arguments and, more surprisingly, also the return type. Consequently, it s possible to have two methods

Figure 7-5. Connections to digital I/O lines from center pin of each connector That s it for the shield setup. Notice that nothing we ve done so far is actually specific to the DS18B20 sensors: in fact, all we ve done is create an Ethernet shield with connectors that each provide power, ground, and access to one digital I/O line each. That makes this shield quite useful for a range of things, such as plugging in other types of sensors or controlling devices if you provide appropriate external buffering. By modifying the code, you could even have a mix of DS18B20s and other devices all connected at once.

Now, in the same directory where you created the cms project (in other words, alongside cms, not inside cms), create a new directory named coltrane. Inside that, create three empty files: __init__.py models.py views.py

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