btnRightParen.setEnabled(false); }else if (ev.getSource().equals(btnAnd)){ filterToks.add(new OperationFT(MechSearchFilter.BoolOp.AND)); txtEqExp.setText(filterExpressionString()); btnBack.setEnabled(true); enableSelectionButtons(); }else if (ev.getSource().equals(btnOr)){ filterToks.add(new OperationFT(MechSearchFilter.BoolOp.OR)); txtEqExp.setText(filterExpressionString()); btnBack.setEnabled(true);