Java

if (table.getCellEditor() != null) {
            table.getCellEditor().stopCellEditing();
        }

public class CellEditor extends AbstractCellEditor implements TableCellEditor {

    protected TextField source = new TextField();
    private ArrayList<IValidator> validators = new ArrayList<IValidator>();

    public CellEditor WithValidation(IValidator validator) {
        validators.add(validator);
        return this;
    }

    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
 
        source.setText(String.valueOf(value));
        return source;
    }

    public Object getCellEditorValue() {
        return source.getText();
    }

    @Override
    public boolean stopCellEditing() {
        String s = ((String) this.getCellEditorValue());
        if (s == null) {
            this.fireEditingCanceled();
            return false;
        }

        for (IValidator v : this.validators) {
            if (!v.isValid(s)) {
                JOptionPane.showMessageDialog(null, v.getErrorMessage());
                this.fireEditingCanceled();
                return false;
            }
        }
        return super.stopCellEditing();
    }
}

this.jTable1.getColumnModel()
                .getColumn(0)
                .setCellEditor(new loyaltyapp.validation.CellEditor()
                .WithValidation(new TextLengthValidator(1, 12)));

public class Roster
{
   int[] shift;
   int length;
   //default constructor
    public Roster()
    {
        length=30;
        shift=new int[length];
     }
     //normal constructor
     public Roster(int[] s)
     {
       shift=s;

      }
      //accessor method
      public int[] getShift()
      {
          return shift;
      }


       public int getLength()
      {
          return shift.length;
       }



      public String display()
      {
          String out="";
          for(int i=0;i<length;i++)
          {
              out+= shift[i] + " ";

           }
         return out;
       }
   }