java 运行时设置环境
我们知道通过System.getProperty可以得到系统中的环境变量的值,如果在运行程序时我们自己要定义一个呢，怎么办，
如：
System.out.println(System.getProperty("workdir"));
通过java 命令可以看到有以下说明：
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.
-cp
-classpath
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-version:
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -jre-no-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:
-enableassertions[:
enable assertions
-da[:
-disableassertions[:
disable assertions
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:
load native agent library
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:
load native agent library by full pathname
-javaagent:
load Java programming language agent, see java.lang.instrument
-splash:
show splash screen with specified image
看到红色的部：如果我们运行时设置：-Dworkdir=%cd% 就可以了
这样就可以输出当前目录了，参考 android-sdk/tools/android.bat