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src/MenuActionAddRow.java

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+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class MenuActionAddRow implements ActionListener {
+    private DataTableModel tableModel;
+    private boolean askForPosition;
+
+    public MenuActionAddRow(DataTableModel tableModel, boolean askForPosition) {
+        this.tableModel = tableModel;
+        // If set to true user will be prompted to input row name
+        this.askForPosition = askForPosition;
+    }
+
+    public void actionPerformed(ActionEvent e) {
+        System.out.println("Create Row");
+
+        // Default parameters
+        // Direction: If true - append north, else append south
+        boolean direction = false;
+        int row = -1;
+
+        if (askForPosition) {
+            Object[] options = {"Добавить на север", "Добавить на юг", "Отмена"};
+
+            JPanel panel = new JPanel();
+            panel.add(new JLabel("Введите номер строки который должен быть добавлен"));
+
+            JTextField textField = new JTextField(10);
+            panel.add(textField);
+
+            // Keep asking for number until valid response is received
+            while (row == -1) {
+                int result = JOptionPane.showOptionDialog(
+                        null,
+                        panel,
+                        "Введите номер строки",
+                        JOptionPane.YES_NO_CANCEL_OPTION,
+                        JOptionPane.PLAIN_MESSAGE,
+                        null,
+                        options,
+                        null
+                );
+
+                // Canceled by user
+                if (result == JOptionPane.CLOSED_OPTION || result == 2) {
+                    return;
+                }
+
+                // Process user response
+                boolean inputDirection = result == 0;
+
+                IndexValidator indexValidator = new IndexValidator(tableModel);
+                int inputRow = indexValidator.validateRowIndex(textField.getText());
+
+                // If an error was encountered
+                if (inputRow == -1) {
+                    continue;
+                }
+
+                // This point is reached only upon receival of valid number
+                direction = inputDirection;
+                row = inputRow;
+            }
+        } else {
+            // If askForPosition is false, then append row to the end
+            row = tableModel.getRowCount();
+        }
+
+        // If direction is north, the actual index is the preceeding one
+        if (direction) {
+            row--;
+        }
+
+        tableModel.addRow(row);
+    }
+}