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To position the cursor we, therefore, need to send a command to the LCD telling it to select Display Register address 0x80 plus the necessary offset, so we need to process the requested X/Y position to determine what that offset needs to be The actual memory addresses for the first character position in each of the four rows on a four-row display are as follows, starting from the top and including the 0x80 base memory address for the Display Register: 0x80 + 0x00 (row 0) 0x80 + 0x40 (row 1) 0x80 + 0x14 (row 2) 0x80 + 0x54 (row 3) The simplest scenario is to jump to a character position on the first row, in which case the address offset is simply the number of positions along that we want to move the cursor.

called Appendable The interface abstracts the basic functionality of the two classes, together with a few others, such as the ability to append characters to existing text In this setup, you can write code that uses either the synchronized version, the unsynchronized version, or both I am not sure if those who introduced the StringBuffer and StringBuilder classes considered this, but they could have introduced the alternative behavior without creating a new class At the time of its construction, it might have been enough to specify whether the class was supposed to be thread safe or not You would add a new StringBuffer(boolean threadSafe) constructor, store the value of the argument in an instance field, and in each method of the class decide whether it s supposed to be synchronized or not, depending on its value.

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We can totally ignore the Y value because the row offset is 0, simply adding the 0x80 Display Register base address to the X value to get the memory address So the function starts by simply adding the base address and the X position into the variable dr to calculate the initial required Display Register address This stage is the same no matter which row is required, so this calculation is always performed void lcd_gotoXY(byte x, byte y) { byte dr = 0x80 + x; If the Y value is 0 and the required position is, therefore, on the first row, that s it! Job done The dr variable will now hold the correct Display Register address However, if Y is greater than zero it means we need to add an extra offset depending on the required row.

non_field_errors %} <p><span class="error"> {{ formnon_field_errors|join:", " }} </span></p> {% endif %} <p>{% if formusernameerrors %} <span class="error">{{ formusernameerrors|join:", " }}</span> {% endif %}</p> <p><label for="id_username">Username:</label> {{ formusername }}</p> <p>{% if formemailerrors %} <span class="error"> {{ formemailerrors|join:", " }} </span> {% endif %}</p> <p><label for="id_name">Your e-mail address:</label> {{ formemail }}</p> <p>{% if formpassword1errors %} <span class="error">.

In addition to keeping backward compatibility, it would allow the compiler to use the version without any synchronization At times, this constructor-based alternative might be a better solution than creating a whole new class, especially if the differences between the two behaviors are minimal You only need to be aware of the potential danger of the increased number of constructors If there are eight versions, each with different behaviors, you might find yourself with eight constructors, taking from one to eight booleans In that situation it might be better to replace the boolean with a multivalue type, either int or enum Then you might have code like the following: public class Arithmetica { private final Version version; public enum Version { VERSION_1_0, VERSION_2_0 } public Arithmetica() { this(VersionVERSION_1_0); } public Arithmetica(Version version) { this.

This can be done using a couple of simple bitwise operators applied to the requested Y value It might look cryptic, but it ll all make sense in a moment..

version = version; } public int sumRange(int from, int to) { switch (version) { case VERSION_1_0: return sumRange1(from, to); case VERSION_2_0: return sumRange2(from, to); default: throw new IllegalStateException(); } } } One reason why this might not have been used in the case of StringBuffer is that if used in a constructor, this approach requires an additional field to be stored inside the class to keep the choice from the alternative behaviors This might increase the memory requirements of one instance, which in some situations might not be desirable The solution to this problem is the use of factory methods Instead of adding a new constructor, there could be a new factory.

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