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java ͨ¹ýSystem.getProperties()»ñȡϵͳ²ÎÊý
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"));
   System.out.println("Java¹©Ó¦É̵ÄURL£º"+props.getProperty("java.vendor.url"));
   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"));
   System.out.println("Ò»¸ö»ò¶à¸öÀ©Õ¹Ä¿Â¼µÄ·¾¶£º"+props.getProperty("java.ext.dirs"));
   System.out.println("²Ù×÷ϵͳµÄÃû³Æ£º"+props.getProperty("os.name"));
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