java - ProcessBuilder delete and rename -

i having processbuilder should delete file.txt , rename newfile.txt. problem both files deleted. idea why , how fix?

public class myprocessbuilder {      public static void main(string[] args){         final arraylist<string> command = new arraylist<string>();          // create files         file file = new file("file.txt");         file newfile = new file("newfile.txt");              try{             if(!file.exists())                 file.createnewfile();             if(!newfile.exists())                 newfile.createnewfile();         } catch(exception e){}          // force remove file.txt         command.add("rm");          command.add("-f");         command.add("file.txt");          // rename newfile.txt file.txt         command.add("mv");         command.add("newfile.txt");         command.add("file.txt");          final processbuilder builder = new processbuilder(command);         try {             builder.start();         } catch (ioexception e) {             e.printstacktrace();         }     } } 

the issue running single command, namely

rm -f file.txt mv newfile.txt file.txt 

this unconditionally deletes files named file.txt, mv , newfile.txt.

you want split 2 separate commands.

better still, use file.delete() , file.renameto(). not give more control, make code more portable.