java - Netbeans, creating custom table model from drag and drop gui designer. -

i have application use inventory of items, trying add jtable jframe in code. have created extension of abstracttablemodel object called itemtablemodel. have dragged , dropped jtable onto designer view in netbeans respective jframe, , renamed m_jttable.

public class itemtablemodel extends abstracttablemodel {     inventory inv;     int rowcount = 0;     int colcount = 3;      public itemtablemodel(inventory in)     {         inv = in;     }      @override     public int getrowcount()      {         return inv.itemlist.size();     }      @override     public int getcolumncount()      {         return colcount;     }      @override     public boolean iscelleditable(int row, int col)      {         return false;     }       @override     public object getvalueat(int rowindex, int columnindex)      {         item = inv.itemslist.get(rowindex);         object reto = null;         switch(columnindex)         {             case 0: reto = (object)it.getitemnumber(); break;             case 1: reto = (object)it.getdescription(); break;             case 2: reto = (object)it.getprice(); break;             default: reto = (object)new string("null"); break;         }         return reto;     } } 

then in method in jframe have code below after inventory loaded

    itemtablemodel data = new itemtablemodel(this.inv);     m_jttable.setmodel(data); 

i have few questions, need call draw table? need specify table model netbeans specifically? how specify column names? , if changes in inventory, how redraw table reflect this? (i plan search inventory , display possible results in table changing inventory 1 search matches)

also, don't need/want make cell editable, table viewing.

what need call draw table?

generally, nothing. if table has being added visible component, setting model automatically update table contents of model

do need specify table model netbeans specifically?

while can "build" model in editor, generally, no. should simple create model , apply table within code source, after initcomponent has being called...

how specify column names?

there couple of ways, easiest override tablemodel#getcolumnname method , return appropriate name requested index

and if changes in inventory, how redraw table reflect this?

this depend on how model implemented. recreate model , re-apply table.

a better solution provide add method, allow add new inventory items table, raise appropriate event using [abstracttablemodel#firetablerowsinserted](http://docs.oracle.com/javase/7/docs/api/javax/swing/table/abstracttablemodel.html#firetablerowsinserted(int, int)) cause table update self.

if want update existing item, can either use setvalueat method directory, or provide means can tell model given item has begin changed, example itemchanged(item item) need find row item represents , fire [abstracttablemodel#firetablecellupdated](http://docs.oracle.com/javase/7/docs/api/javax/swing/table/abstracttablemodel.html#firetablecellupdated(int, int))

(i plan search inventory , display possible results in table changing inventory 1 search matches)

take @ how use tables, sorting , filtering

also, don't need/want make cell editable, table viewing.

you've overridden iscelleditable return false, should working...

take time read through how use tables lots more details