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class   Global   {  
      public   static   final   String   APPNAME=   "xyz";   //È«¾Ö³£Á¿
      public   static   String   currentUser   =   "abc";     // È«¾Ö±äÁ¿
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  class   WhatEver   {  
      ...  
      System.out.println(Global.APPNAME);  
      Global.currentUser   =   "Williams";  
  }


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