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(106)  评论(0)  编辑  收藏  举报
.First { margin: 10px 0; font-family: 'Microsoft Yahei'; text-align: left; padding: 6px 20px; color: #fff; background: #55895B; font-size: 20px; border-radius: 4px; clear: both; } .Second { margin: 10px 0; font-family: 'Microsoft Yahei'; padding: 6px 20px; background: #93C8A2; color: white; font-size: 18px; border-radius: 4px; clear: both; } .Third { margin: 10px 0; padding: 6px 20px; font-family: 'Microsoft Yahei'; margin: 15px 0; font-size: 16px; color: black; background: #C6EFD2; border-radius: 4px; clear: both; } .note { margin: 10px 0; padding: 15px 20px 15px 60px; background: #FCFAA9 url('http://images.cnblogs.com/cnblogs_com/libaoheng/305804/o_yellow-pin.png') no-repeat 20px 0; font-size: 15px; font-family: 'Microsoft Yahei'; box-shadow: 0 0 8px #aaa; clear: both; } .demo { text-align: left; padding: 6px 20px; overflow: auto; border-radius: 4px; background: orange; color: #fff; font-size: 16px; clear: both; } .cnblogs_Highlighter { border: solid 1px #ccc; clear: both; } .cnblogs_code { background: #EFFFF4; border: solid 0px #939393; font-size: 14px; clear: both; padding: 10px 20px; } .cnblogs_code pre { font-size: 14px; } .cnblogs_code span { font-family: Courier New; font-size: 14px; }