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Properties props=System.getProperties(); //ϵͳÊôÐÔ  
   System.out.println("JavaµÄÔËÐл·¾³°æ±¾£º"+props.getProperty("java.version"));  
   System.out.println("JavaµÄÔËÐл·¾³¹©Ó¦ÉÌ£º"+props.getProperty("java.vendor"));  
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   System.out.println("JavaµÄ°²×°Â·¾¶£º"+props.getProperty("java.home"));  
   System.out.println("JavaµÄÐéÄâ»ú¹æ·¶°æ±¾£º"+props.getProperty("java.vm.specification.version"));  
   System.out.println("JavaµÄÐéÄâ»ú¹æ·¶¹©Ó¦ÉÌ£º"+props.getProperty("java.vm.specification.vendor"));  
   System.out.println("JavaµÄÐéÄâ»ú¹æ·¶Ãû³Æ£º"+props.getProperty("java.vm.specification.name"));  
   System.out.println("JavaµÄÐéÄâ»úʵÏÖ°æ±¾£º"+props.getProperty("java.vm.version"));  
   System.out.println("JavaµÄÐéÄâ»úʵÏÖ¹©Ó¦ÉÌ£º"+props.getProperty("java.vm.vendor"));  
   System.out.println("JavaµÄÐéÄâ»úʵÏÖÃû³Æ£º"+props.getProperty("java.vm.name"));  
   System.out.println("JavaÔËÐÐʱ»·¾³¹æ·¶°æ±¾£º"+props.getProperty("java.specification.version"));  
   System.out.println("JavaÔËÐÐʱ»·¾³¹æ·¶¹©Ó¦ÉÌ£º"+props.getProperty("java.specification.vender"));  
   System.out.println("JavaÔËÐÐʱ»·¾³¹æ·¶Ãû³Æ£º"+props.getProperty("java.specification.name"));  
   System.out.println("JavaµÄÀà¸ñʽ°æ±¾ºÅ£º"+props.getProperty("java.class.version"));  
   System.out.println("JavaµÄÀà·¾¶£º"+props.getProperty("java.class.path"));  
   System.out.println("¼ÓÔØ¿âʱËÑË÷µÄ·¾¶ÁÐ±í£º"+props.getProperty("java.library.path"));  
   System.out.println("ĬÈϵÄÁÙʱÎļþ·¾¶£º"+props.getProperty("java.io.tmpdir"));  
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 public static String getMondayOfThisWeek() {
  Calendar c = Calendar.getInstance();
  int day_of_week = c.get(Calendar.DAY_OF_WEEK) - 1;
  if (day_of_week == 0)
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