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if (y&1) dr+= 0x40; if (y&2) dr+= 0x14; Think about the binary representation of the requested Y value for a moment If it was row 0, that s B00 If it row was 1, that s B01 If it was row 2, that s B10 If it was row 3, that s B11 Now look at the logical AND operator in those previous two lines of code If row 1 was requested, the first comparison will match and 0x40 will be added to the Display Register address If row 2 was requested, the second comparison will match and 0x14 will be added to dr If row 3 was requested, both bitwise comparisons will match and 0x54 will be added And with that, the correct row offset has been applied and a row/column coordinate pair converted into a single Display Register memory address in just three lines of code.

{{ form.passsword1.errors|join:", " }} </span> {% endif %}</p> <p><label for="id_password1">Password:</label> {{ form.password1 }}</p> <p>{% if form.password2.errors %} <span class="error"> {{ form.passsword2.errors|join:", " }} </span> {% endif %}</p> <p><label for="id_password2">Password (again, to catch typos): </label> {{ form.password2 }}</p> <p><input type="submit" value="Submit"></p> </form> </body> </html> Most of the HTML here is pretty simple: a standard <form> tag with <label> tags for each field and a button to submit. But notice how you actually show the fields. Each one is accessed as an attribute of the {{ form }} variable. You can check each one to see if it had any errors and display the error messages (which will be in a list, even if there s only one message hence you use the join template filter, which can join a list of items using a specified string as a separator). Note, though, that at the top of the form you use {{ form.non_field_errors }}. This is because the error raised from the clean() method doesn t belong to any one field (since it comes from comparing two fields to each other). Whenever you have a potential validation error from the clean() method, you ll need to check for non_field_errors and display it if present.

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method The factory method doesn t need to create the actual type it returns, but a subtype instead So, in this case you would have the following: public static StringBuffer createUnsynchronized() { return new StringBufferUnsynch(); } This eliminates the need for internal field switching between the alternatives, as the switch is done inside the factory method by creating the correct subtype Also, it lets you keep the code in the StringBuffer simple and free of any switches, because methods that are overridden by the package private subclass StringBufferUnsynch achieve all the required behavior adjustments This is a good solution that shows the power of factory methods, except that it would not work too well for StringBuffer because it requires the class to be subclassable and StringBuffer is final However, in other situations this approach can work well Alternative behavior is also often needed when you are using service provider APIs.

This is extremely efficient in both memory use and speed, but it does have the limitation that it won t work with displays of more than 20 columns The final calculated value is then sent to the LCD lcd_commandWrite( dr ); } A number of simple functions are also defined for printing values to the display and clearing it, but they are far more self-explanatory than the cursor-position function Initializing the LCD takes a bit of work, partly because the OBDuinoMega sketch defines some custom characters to display special symbols Rather than waste four whole characters on the cramped LCD just to display km/h, the program defines a pair of custom characters that pack the same information into just two display positions.

For example, you need alternative behaviors for interfaces that people implement or extend and then pass around to some kind of infrastructure for processing As has been discussed in the section Adding a Method or a Field in 6, adding a method to an existing interface is not compatible behavior Adding a method to an abstract class is more or less acceptable, though usually not 100 percent binary compatible That is why the best way to accommodate the new requirements that appear with the new version is either to add new factory methods, if they consume the provider interfaces before passing them to the infrastructure, or to add new interfaces such as LayoutManager2 This is a possible solution; however, if you really want to be sure that things remain compatible, remember that it is better to request new interfaces instead of existing ones.

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