docs: private void createButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_createButtonActionPerformed
          // Generate sequence
          int start;
          int stop;
          int step;
          int i;
          String resultant = "";
  
          try {
              start = Integer.parseInt(startField.getText());
              stop = Integer.parseInt(stopField.getText());
              step = Integer.parseInt(incrementField.getText());
          } catch (NumberFormatException nfe) {
              System.out.println("Invalid input value");
              return;
          }
  
          if (step <= 0) {
              System.out.println("Invalid increment value");
              return;
          }
  
          if (start >= stop) {
              System.out.println("Invalid sequence");
              return;
          }
  
          for (i = start; i <= stop; i += step) {
              resultant += applyFormat(Integer.toString(i));
              resultant += '\n';
          }
  
          sequenceArea.setText(resultant);
      }