9.5.4 Conditional compilation directives

9.5.4 Conditional compilation directives The conditional compilation directives are used to conditio

9.5.1 Conditional compilation symbols The conditional compilation functionality provided by the #if,

Conditional Compilation Although debugging techniques can help you iron out problems in your code,

在编码的时候，有时候需要添加一些DEBUG信息，来为了方便调试程序，但是到了真正发布的时候，又不希望把这些信息进行编译发布。那么在以前C或者C++编码的时候，用IF/ENDIF来定义程序块实现这个功能

9.5.7 Line directives Line directives may be used to alter the line numbers and source file names t

9.5 Pre-processing directives The pre-processing directives provide the ability to conditionally ski

在前面的教程中，我们已经使用了java.util.Date。可以有人就会问：为什么不只使用import java.util.*呢？其实，在JSPs中也可以使用import语句，但是它的语法跟普通的Ja

Using-directives facilitate the use of namespaces and types defined in other namespaces. Using-dire

9.5.3 Declaration directives The declaration directives are used to define or undefine conditional

The ?: operator is called the conditional operator. It is at times also called the ternary operator