Part II: Core ActionScript 3.0 Data Types in Java

Implement ean13+2 in Java Part II: Core ActionScript 3.0 Data Types
Part II: Core ActionScript 3.0 Data Types
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Using Escaped Characters
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String literals use quotes to tell the compiler that the text contained within them should be interpreted as a string. Both single and double quotes are used, and in some cases they can be used interchangeably. In other cases, you ll need to know their special properties to choose the right combination of quotes. Let s look at how they behave differently. Say you want to store a piece of text that contains quotes:
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var porky:String = Porky says "That s all folks!" ;
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The compiler expects you to enclose string literals in matching types of quotes. In other words, whichever type of quote mark you use to begin the literal will be the type that the compiler looks for to denote the end of that literal. You can take advantage of this fact to put quotes inside literals: if you need to use single quotes in the string, you can delineate the literal with double quotes. If you need to use double quotes, you can sneak those in between single quotes. In this example, I ve started and ended with a single quote, and that lets me get away with double quotes inside the string. However, there s still a problem with it. The compiler will nd an error in this code because the string is interpreted as Porky says "That . Once the compiler sees the single quote after That, it decides: End of string. Time to move on and keep reading code. But then, confronted with s all folks!" , it has no idea what to do. In cases like this, you need to use escaped characters. Escaped characters are special pseudo-characters that the compiler replaces with real characters that may be dif cult to type or would be illegal to type in code. Escape characters are preceded by a backslash. The escape characters for double and single quotes are \" and \ respectively. The other escape sequences you can use are shown in Table 6-1. Here s an example:
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var bugs:String = Bugs says \"What\ s up, doc \" ; trace(bugs); //Bugs says "What s up, doc "
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When you use the escaped version of characters, they are immune to being treated as string delimiters. Several escape characters are available to you. Another of the most useful ones is the newline character, \n, which starts a new line as if by pressing the Enter key. The following code in Example 6-1:
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EXAMPLE 6-1
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http://actionscriptbible.com/ch6/ex1/
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The Newline Character
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var ok:String = "In an interstellar burst,\nI am back to save the universe." trace(ok);
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Will display the following:
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In an interstellar burst, I am back to save the universe.
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6: Text, Strings, and Characters
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Different platforms use different characters for newlines. In most cases, you re safe sticking to \n. But in some cases, you may need to use \r\n for Windows platforms or \r for legacy Mac platforms.
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TABLE 6-1
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Available Escape Sequences
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Escape Sequence Resulting String
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\b \f \n \r \t \unnnn \xnn \ \" \\
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Backspace character. Form feed character. This character advances one page and is rarely used. Newline character. Also known as line feed. Carriage return character. Tab character. Inserts a character with the four-digit hexadecimal Unicode code you specify; for example, \u0416 is the Cyrillic character zhe ( ). Inserts a character with the two-digit hexadecimal ASCII code you specify; for example, \x9D is the yen sign character ( ). Single quote ( ) character. Double quote (") character. Backslash (\) character.
Converting to and from Strings
Because strings are human-readable, they are the preferred method for displaying information about other objects in Flash. For this reason, every object in ActionScript 3.0 inherits the toString() method to represent itself as a String. You can read more about toString() in 10, Objects and Dictionaries.
Using toString()
Say you want to display the current date using an instance of the Date class:
var now:Date = new Date(); trace("Today s date is " + now.toString()); //Today s date is Mon Jun 15 14:10:20 GMT-0400 2009