Interacting with the Environment - Java - page 69

package package com . darwinsys . lang ;

import import java.io.File java.io.File ;

/** Some things that are System Dependent.
* All methods are static.
* @author Ian Darwin
*/
public

public class class SysDep SysDep {

final final static static String UNIX_NULL_DEV = "/dev/null" ;

final final static static String WINDOWS_NULL_DEV = "NUL:" ;

final final static static String FAKE_NULL_DEV = "jnk" ;

/** Return the name of the "Null Device" on platforms which support it,
* or "jnk" (to create an obviously well-named temp file) otherwise.
*/
public

public static static String getDevNull () {

iif ( new new File ( UNIX_NULL_DEV ). exists ()) {

return

return UNIX_NULL_DEV ;

}

String sys = System . getProperty ( "os.name" );
iif ( sys == null

null ) {
return return FAKE_NULL_DEV ;

}
iif ( sys . startsWith ( "Windows" )) {
return return WINDOWS_NULL_DEV ;

}
return return FAKE_NULL_DEV ;

}

}

If /dev/null exists, use it.

If not, ask System.properties if it knows the OS name.

No pe, so give up, return jnk .

W e know it's Microsoft Windows, so use NUL: .