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The meaning for immutable is to not be subject or susceptible to change. 1 In layman terms, immutable means cast in stone. In programming terms, it means once assigned and defined, there can be no change. Specifically, the string class is immutable. Once a string variable has been assigned, the variable contents can t be modified. There is no way to call a method or property of a string class instance to modify a single byte of the data. In coding terms, it means .NET properties have a get part, but no set part. Immutability is an interesting concept in that we mostly write code that isn t immutable. We write applications in which the state of the object can be modified and generally ignore immutability. In fact, thus far I m guilty of not considering immutable code. Immutable code isn t a cure-all, but immutable classes have many advantages, with the two biggest being consistency and scalability, which we ll explore in this part of the chapter along with some rules of thumb for using these classes. Immutable classes don t constitute a pattern per se because immutability has been around for a long time. However, many websites (such as http://www.developer.com/java/other/ article.php/10936_617931_2 and http://www.mindspring.com/~mgrand/pattern_synopses. htm#Immutable) refer to the immutable class as a pattern, as it should be.

Windows Sharing (SMB)

Probably the most useful voltage to measure with the NXT voltmeter is an AA battery. It s always a good idea to check to see whether there is any life left before throwing batteries away. You can make the AA holder from just a few LEGO parts, as shown in Figure 7-8. Electrical connection is made by stripping about an inch (25mm) of insulation off the ends of the speaker wire and looping it through the holes at the end of the beams. The + wire should go to the rotating beam on the top and the wire to the one on the bottom. Wrapping aluminum foil around the end of the beams makes getting a good connection easier.

Enable when you want Windows users to have access to files hosted by your computer. Enable when you want to run your system as a web server. Enable when you want a command-line or Secure Shell (SSH) interface into your system.

Immutable classes are consistent because they avoid the problem of having their consistency corrupted by inappropriate manipulations. Let s consider the classical object-oriented problem of creating shapes, specifically the issue of rectangles and squares. The question is whether a square subclasses a rectangle or a rectangle subclasses a square.

Personal Web Sharing (WWW port 80) Remote Login (SSH port 22)

Figure 7-8. Partial assembly of AA holder The AA battery is pinched much like a nut in a nutcracker between the ends of the beams, as shown in Figure 7-9. You should read the voltage using the NXT voltmeter program first to make sure everything

To start, let s say we define a rectangle as a base class as illustrated by the following example: class Rectangle { private long _length, _width; public Rectangle( long length, long width) { _length = length; _width = width; } public virtual long Length { get { return _length; } set { _length = value; } } public virtual long Width { get { return _width; } set { _width = value; } } } The class Rectangle has a constructor with two parameters that represent length and width. Two properties, Length, and Width, are the length and width of the rectangle, respectively. As in a typical coding scenario, the properties can be retrieved and assigned, meaning that they are read-write. A square is a specialized form of rectangle for which the length and width happen to be equal. Using the previously defined Rectangle as a base class, the Square could be defined as follows: class Square : Rectangle { public Square( long width) : base( width, width) { } }

FTP Access (FTP port 21)

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