1 /**
 2  * Created by xfyou on 2016/11/3.
 3  */
 4 public class SysDep {
 5     final static String UNIX_NULL_DEV = "/dev/null";
 6     final static String WINDOWS_NULL_DEV = "NULL";
 7     final static String FAKE_NULL_DEV = "jnk";
 8 
 9     public static String getDevNull() {
10         if (new File(UNIX_NULL_DEV).exists()) {
11             return UNIX_NULL_DEV;
12         }
13         String sys = System.getProperty("os.name");
14         if (sys == null) {
15             return FAKE_NULL_DEV;
16         }
17         if (sys.startsWith("Windows")) {
18             return WINDOWS_NULL_DEV;
19         }
20         return FAKE_NULL_DEV;
21     }
22 
23     public static void main(String[] args) {
24         System.out.println(getDevNull());
25     }
26 }