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第六节 SWT类的常量与函数

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SWT类有一堆类级别(class-level)的常量和方法用来简化SWT编程。

没有什么事情阻止您创建一个SWT对象，因为创建一个不会带来任何坏处。SWT类继承于java.lang.Object，它没有定义构造函数，所以默认的构造函数会被调用。然而，一个SWT对象除了继承于java.lang.Object的状态，没有任何状态(state)，本质上这些状态也是没什么用的。

SWT类提供了一些有用的方法，像前面提到的，都是静态的(static)。大多数程序不必用到这些方法；它们在表3-6中列出。

表3-6: SWT 的方法

方法	说明
static void error(int code)	Throws an exception based on code. It's the same as calling static void error(int code, (Throwable) null).
static void error(int code, Throwable throwable)	Throws an exception based on code. throwable should either be null or the Throwable that caused SWT to throw an exception. code is one of the error constants defined in SWT.
static String getMessage (String key)	Gets the appropriate National Language Support (NLS) message as a String for key. See java.util.ResourceBundle for more information on NLS. The resource bundle is found in org.eclipse.swt.internal.SWTMessages .properties; see Table 3-7 for the supported keys and corresponding messages.
static String getPlatform()	Gets the SWT platform name (for example, "win32," "gtk," "carbon").
static int getVersion()	Gets the SWT library version number.

表3-7: SWT消息的键(Key)和值(value)

键	值
SWT_Yes	Yes
SWT_No	No
SWT_OK	OK
SWT_Cancel	Cancel
SWT_Abort	Abort
SWT_Retry	Retry
SWT_Ignore	Ignore
SWT_Sample	Sample
SWT_A_Sample_Text	A Sample Text
SWT_Selection	Selection
SWT_Current_Selection	Current Selection
SWT_Font	Font
SWT_Color	Color
SWT_Extended_style	Extended style
SWT_Size	Size
SWT_Style	Style
SWT_Save	Save
SWT_Character_set	Character set
SWT_ColorDialog_Title	Colors
SWT_FontDialog_Title	Fonts
SWT_Charset_Western	Western
SWT_Charset_EastEuropean	East European
SWT_Charset_SouthEuropean	South European
SWT_Charset_NorthEuropean	North European
SWT_Charset_Cyrillic	Cyrillic
SWT_Charset_Arabic	Arabic
SWT_Charset_Greek	Greek
SWT_Charset_Hebrew	Hebrew
SWT_Charset_Turkish	Turkish
SWT_Charset_Nordic	Nordic
SWT_Charset_Thai	Thai
SWT_Charset_BalticRim	Baltic Rim
SWT_Charset_Celtic	Celtic
SWT_Charset_Euro	Euro
SWT_Charset_Romanian	Romanian
SWT_Charset_SimplifiedChinese	Simplified Chinese
SWT_Charset_TraditionalChinese	Traditional Chinese
SWT_Charset_Japanese	Japanese
SWT_Charset_Korean	Korean
SWT_Charset_Unicode	Unicode
SWT_Charset_ASCII	ASCII
SWT_InputMethods	Input Methods

在Windows XP下Eclipse 2.1.1中输入这些代码：

System.out.println("Platform: " + SWT.getPlatform());

System.out.println("Version: " + SWT.getVersion());

这些代码会打印：

Platform: win32

Version: 2135

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