public AtomicFile(File baseName){
  mBaseName=baseName;
  mBackupName=new File(baseName.getPath() + ".bak");
}

public AtomicFile ( File baseName ) { mBaseName = baseName ; mBackupName = new File ( baseName . getPath ( ) + ".bak" ) ; }
create a new atomicfile for a file located at the given file path . the secondary backup file will be the same file path with " . bak " appended .
