boolean found = false;
            while ((read = bufferedReader.readLine()) != null) {
            	if(read.trim().equalsIgnoreCase(dnic.getText())){
            		JOptionPane.showMessageDialog(this, "Encontrado: \n"+
            				" \n Nombre: "  +bufferedReader.readLine()  +
            				" \n Apellido: "+bufferedReader.readLine()  +
            				" \n Telefono: "+bufferedReader.readLine()  +
            				" \n","Encontrado(a)",
            				JOptionPane.INFORMATION_MESSAGE);
            		found = true;
            		break;
            		}
                }
            if(!found){
            	JOptionPane.showMessageDialog(this, "No Encontrado", " ", JOptionPane.INFORMATION_MESSAGE);
            }

int []matriz[] = new int[4][6];
....
....
matriz[index][j] =index+j;

  this.add(new puerta(e.getX()-30, e.getY()-30));

table.changeSelection(0, 1, true, false);
 
//otro metodo
table.setRowSelectionInterval(0,0); 

table.changeSelection(0, 1, true, false);

JOptionPane.showInputDialog("digite la tercer nota");