constructor - Java UNIXProcess not visible in Eclipse? -

i tried use unixprocess.class, eclipse keeps warning me unixprocess not visible.

the code simple:

import java.lang.process;  public class simple {     unixprocess process;  } 

can know use unixprocess? thanks

java.lang.unixprocess declared default visibility means cannot seen classes outside of package java.lang.*. use processbuilder or runtime.exec(), instead, create valid process object.