java - JTable - same items displayed -

as can see when trying new items got repetition. should do?

i wrote jtable redisplayer class. have add button table. when click button should exp addded 1. after add 2. should display 1 2 only. not 1 1 2 that.

     jtable1.removeall();      jtable1.revalidate();      try{           class.forname("com.mysql.jdbc.driver");      }      catch(classnotfoundexception e){           system.err.println("driver yok");             return;      }      connection con=null;          try{          con=drivermanager.getconnection("jdbc:mysql://localhost:3306/kutuphane","root","");          system.out.println("veritabnı baglandıldı");          statement stmt=con.createstatement();          resultset rs=stmt.executequery("select * kisiler ");       while(rs.next()){          model=(defaulttablemodel) jtable1.getmodel();          model.insertrow(i,new object[]{rs.getstring("adsoyad"),rs.getint("telefon"),rs.getint("tcno"),rs.getstring("adres")   } );          i++;         }       jtable1.setmodel(model);       jtable1.revalidate();        stmt.close();       rs.close();     }      catch(sqlexception e){      system.out.println("veritabanı baglanmadi");      e.printstacktrace();     }      finally{         if(con!=null)         try{             con.close();     }      catch(sqlexception e){           e.printstacktrace();     } 

first, rid of line @ top of code

jtable1.removeall();    //delete line!! 

you expecting remove lines table model, that's not does.

next, replace while loop , 2 lines after with:

model = new defaulttablemodel(); while(rs.next()){      model.addrow(new object[]{         rs.getstring("adsoyad"),         rs.getint("telefon"),         rs.getint("tcno"),         rs.getstring("adres")}      );     }  jtable1.setmodel(model); 

note using addrow instead of insertrow, i no longer necessary.