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var intValue:Integer = 1234; var numberValue:Number = intValue; // Conversion from Integer to Number println("intValue: {intValue}, numberValue: {numberValue}");
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5 Variables and Data Types
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The code above prints the following:
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intValue: 1234, numberValue: 12340
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The same is true of expressions that evaluate to an Integer value:
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var numberValue:Number = 1 + 2 + 3 + 4;
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These conversion are valid and risk-free because a Number can hold any value that an can, without loss of precisionThe reverse is not true, however a Number can hold a fractional value or one that is too large to be represented by an Integer For that reason, an implicit conversion from Number to Integer is allowed but is flagged with a warning at compile time:
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Integer // Gives a warning: 123400 is a Number, not an Integer var intValue1:Integer = 123400; var numberValue1:Number = 123412; // Gives a warning: assignment of Number to Integer var intValue2:Integer = numberValue1;
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The same rules apply for assignments involving the other numeric types In some cases, you know that assignment of a Number value to an Integer (for example) is what you want, even if some precision might be lost In that case, you can suppress the warning by converting the Number value to an Integer using the as operator:
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// Assigns 1234 to intValue1, no warning var intValue1:Integer = 123400 as Integer;
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When the exact value of a Number variable cannot be represented by an Integer, information is lost:
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var intValue1:Integer = 123455 as Integer; println("{intValue1}");
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Because intValue1 cannot hold a number with a fractional part, it is simply truncated, and the result is the value 1234 Note the result is truncated, not rounded to the nearest whole number Similarly, the result of the following code is the value -1234, not -1235, although the latter is mathematically more accurate:
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var intValue1:Integer = -123455 as Integer; println("{intValue1}");
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If a Number whose value is larger than the largest representable Integer is assigned to an Integer variable, the result of the assignment is the largest possible Integer value with the same sign as the Number:
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// This is larger than the largest positive Integer var intValue1:Integer = 900000000000 as Integer;
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// This is larger in magnitude than the largest negative Integer var intValue2:Integer = -900000000000 as Integer; println("intValue1: {intValue1}, intValue2: {intValue2}");
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The output of this code is as follows:
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intValue1: 2147483647, intValue2: -2147483648
Character Types The Character type represents a single Unicode character and holds an unsigned integer value in the range 0 to 65535, inclusiveA Character variable can be initialized by using an integer literal, in the normal way:
var c:Character = 0x41; // The letter 'A'
Java char values are automatically converted to the Character type on assignment:
var c:Character = "Hello"charAt(0); // Assigns 'H'
Note
At the time of this writing, there is no JavaFX equivalent of the following Java statement:
char c = 'a';
In JavaFX, 'a' is a String literal, not a character literal, so this assignment fails because the types are incompatible There is an issue filed against the compiler that might result in this being fixed at some point, so that any of the following would assign the Unicode character value for the letter 'h' to the variable c:
var c:Character = "h"; var c:Character = 'h; var c:Character = "Hello, World";
An attempt to assign a literal value that is outside the permitted range causes a compilation error:
var c:Character = -1; // Invalid - compilation error var d:Character = 65536; // Invalid - compilation error
As with the other numeric types, this error can be suppressed by using the as operator:
var c:Character = -1 as Character; // Actually assigns the value 65535
It is legal to directly assign a Character value to a Character variable, but the assignment of other types requires an explicit conversion:
var b:Byte = 0x41; var c:Character = 0x41; var i:Integer = 0x41;