JavaFX教程-表达式
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下一篇 2008-03-18 16:50:41
/ 个人分类：Javafx
表达式
JavaFX支持如下操作符：
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| 操作符 | 含义 | Java等价物 |
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| 关系操作符 |
== | equality | == |
<> | inequality | != |
< | less than | < |
> | greater than | > |
<= | less than or equal | <= |
>= | greater than or equal | >= |
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| 布尔操作符 | |
and | logical and | && |
or | logical or | || |
not | logical negation | ! |
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| 算术操作符 |
+ | addition | + |
- | subtraction; unary negation | - |
* | multiplication | * |
/ | division | / |
% | remainder | % |
+= | add and assign | += |
-= | subtract and assign | -= |
*= | multiply and assign | *= |
/= | divide and assign | /= |
%= | remainder and assign | %= |
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| 其它操作符 |
sizeof | array length | n/a |
indexof | ordinal position | n/a |
ife1thene2elsee3 | 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
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