JavaFX教程-表示式

表示式

JavaFX支援如下操作符：

操作符	含義	Java等價物
關係操作符
==	equality	==
<>	inequality	!=
<	less than	<
>	greater than	>
<=	less than or equal	<=
>=	greater than or equal	>=
布林操作符
and	logical and	&&
or	logical or	||
not	logical negation	!
算術操作符
+	addition	+
-	subtraction; unary negation	-
*	multiplication	*
/	division	/
%	remainder	%
+=	add and assign	+=
-=	subtract and assign	-=
*=	multiply and assign	*=
/=	divide and assign	/=
%=	remainder and assign	%=
其它操作符
sizeof	array length	n/a
indexof	ordinal position	n/a
if e1 then e2 else e3	conditional expression	e1 ? e2 : e3
select	list comprehension	n/a
foreach	list comprehension	n/a
new	allocation	new
op()	function/operation call	n/a
x.op()	member function/operation call	x.op()
instanceof	type check	instanceof
this	self access	this
.	attribute access, context access	., n/a
bind [lazy]	incremental [lazy] evaluation	n/a
:	eager initialization	n/a
[]	array selection	[]
format as	String formatting	n/a
<<>>	Identifier quotes	n/a
{}	String expression	n/a
(expr)	grouping	(expr)
reverse	reverses a list	n/a
[number1,next..number2]<!--	numeric range	n/a

一些示例：

         
	import java.lang.System;
	import java.lang.Math;
	
	var x = 2;
	var y = 4;
	var a = true;
	var b = false;
	System.out.println(x == y);  // prints false
	System.out.println(x <> y);  // prints true
	System.out.println(x < y);   // prints true
	System.out.println(x > y);   // prints true
	System.out.println(x >= y);  // prints false
	System.out.println(x <= y);  // prints true
	System.out.println(x + y);   // prints  6
	System.out.println(x - y);   // prints  -2
	System.out.println(x * y);   // prints  8
	System.out.println(x / y);   // prints  0.5
	System.out.println(x % y);   // prints  2
	System.out.println(a and b); // prints  false
	System.out.println(a or b);  // prints  true
	System.out.println(not a);   // prints  false
	System.out.println(sizeof [x,y]);   // prints  2
	System.out.println([x,y][indexof . == 0]);   // prints  2
	System.out.println(if a then x else y); // prints 2
	System.out.println(select q from q in [x, y] where q > 3); prints 4
	System.out.println(foreach(q in [x, y] where q < 3) q); prints 2
	System.out.println(Math.max(x, y)); // prints 4
	System.out.println("abc".toUpperCase()); // prints ABC
	System.out.println(x instanceof Number); // prints true
	x = 10;
	System.out.println(x); // prints 10

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/13270562/viewspace-209691/，如需轉載，請註明出處，否則將追究法律責任。