This is a double quote - " - in a single-quoted string in Java

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This is a double quote - " - in a single-quoted string
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Naturally, if you want a single quote inside a single-quoted string, you have to use an escape sequence:
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println('"That\'s one small step for man"');
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This code prints the following:
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"That's one small step for man"
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The default value of a String variable is the empty stringAssigning null to a String actually assigns the empty string:
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var s:String; s = null; println("s is the empty string {s == ''}");
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The preceding code prints this:
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s is the empty string true
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String Concatenation You can split long strings into pieces and have the compiler concatenate them, by placing them next to each other, like this:
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var s:String = "That's one " "small step for man, " "one giant leap for mankind";
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Single quotes and double quotes produce the same result, provided you escape nested quotes properly:
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var s:String = 'That\'s one ' 'small step for man, ' 'one giant leap for mankind';
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You can also spread the parts over several lines:
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var s:String = "That's one " "small step for man, " "one giant leap for mankind";
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All the preceding examples produce the following string, at compile time:
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"That's one small step for man, one giant leap for mankind"
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Note that the newlines in the source file do not appear in the string If you need newline characters, you can embed them by using the escape sequence \n, like this:
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var s:String = "That's one\n" "small step for man,\n" "one giant leap for mankind";
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Another way to create the same string is like this:
var s:String = "That's one\nsmall step for man,\none giant leap for mankind";
Both of these create a string that looks like this when printed:
That's one small step for man, one giant leap for mankind
Note
The + operator cannot be used to combine String variables in JavaFX
Embedded Expressions Text between matched curly braces within a JavaFX string is extracted at compile time and treated as an expression (see 6)The expression is evaluated at runtime, and the result is converted to a string and inserted in place of the expression itself Here s an example:
var string:String = "Hello"; println("Value is {string}, length: {stringlength()}");
This produces the following output:
Value is Hello, length: 5
In this example, the expressions are simple, but they need not be Here s another, slightly more interesting example:
var odd:Boolean = (javalangSystemcurrentTimeMillis() mod 2) != 0; println("Current time is {if (odd) "odd" else "even"}");
The first line gets the current system time from the Java SystemcurrentTimeMillis() method and sets the value of the variable odd to true if the time has an odd value (that is,
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the remainder on division by 2 is not 0) and false if it does notThe expression in the string on the second line is a JavaFX if statement, which is covered in 8, Controlling Program Flow :
if (odd) "odd" else "even"
Unlike the Java if statement, the JavaFX version always returns a value Here, it returns the string value odd if the value of the variable odd is true and even if it is falseThe output of this example will vary depending on exactly when the current time is read, but will be one of the following:
Current time is even Current time is odd
Because the characters { and } are used to indicate the presence of an expression, if you want them to appear within a string, you must use the Unicode value or escape them in the usual way:
println("Open curly bracket: \{, close curly bracket: \}");
This prints the following:
Open curly bracket: {, close curly bracket: }
Note that both the open and closing braces must be escaped Embedded Formatting The second expression example previously shown compiles to code that is roughly equivalent to the following Java statements:
boolean odd = (SystemcurrentTimeMillis() % 2) != 0; println(Stringformat("Current time is %s", odd "odd" : "even"));
Note that the embedded expression is replaced by the string %s, and then the method is used to interpolate the result of the expression into the string before it is printed If you are not familiar with the enhanced formatting facilities added in J2SE 5, consult the Javadoc documentation for the javautilFormatter class before reading further The %s in the string to be formatted is an example of a format specifier Whenever you include an expression in a JavaFX string, that expression will, by default, be replaced by %s, and code similar to that previously shown will be generatedAt runtime, the %s format specifier converts the result of the expression to a string as follows: If the expression result is null, the string null is used Otherwise, if the expression returns an object that implements the javautilFormattable interface, it is converted to string form by invoking its formatTo() methodThis allows custom formatting to be performed Otherwise, and this is most common case, the toString() method of the expression value is used to convert it to string form
Stringformat()