System类 

位于：java.lang.System

  public final class System extends Object

  小程序-------查看虚拟机在加载时干了哪些事情

System.getProperties

 可以设置系统的属性

  public static void setProperties(Properties props)

public static String setProperty(String key,String value)
而设置的值，只要虚拟机还在，值就还在，是共享的！！！
这一点必有用处---以后补充
posted @ 2015-08-26 10:02  洱海  阅读(107)  评论(0)  编辑  收藏  举报
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