public HeaderSection(DexFile file){
  super(null,file,4);
  HeaderItem item=new HeaderItem();
  item.setIndex(0);
  this.list=Collections.singletonList(item);
}

public HeaderSection ( DexFile file ) { super ( null , file , 4 ) ; HeaderItem item = new HeaderItem ( ) ; item . setIndex ( 0 ) ; this . list = Collections . singletonList ( item ) ; }
constructs an instance . the file offset is initially unknown .
