private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
        String key = jTextField3.getText();
        ArrayList<Department> list = ddb.getDepartmentByName(key);
        tm.setRowCount(0);
        list.stream().map((department) -> {
            tm.addRow(department.toObject());
            return department;
        }).forEachOrdered((item) -> {
            rowCount();
        });
    }