Неверный переход курсора между компонентами по нажатию TAB

getContentPane().setFocusTraversalPolicy(new FocusTraversalOnArray(new Component[]{tf1, tf2, tf3, okButton, cancelButton}));

this.setFocusTraversalPolicyProvider(true);

package tabtest;
 
import java.awt.Component;
import java.awt.Container;
import java.awt.FocusTraversalPolicy;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class TabTest extends JPanel {
    
    private Component[] focusList;
    private int focusNumber = 0;
 
    TabTest() {
        JFrame frame = new JFrame("test");
 
        JLabel l1 = new JLabel("test_label");
        JTextField tf1 = new JTextField("test text field 1");
        JTextField tf2 = new JTextField("test text field 2");
        JButton b = new JButton("test_button");
 
        focusList = new Component[]{b, tf2, tf1};
 
        this.add(l1);
        this.add(tf1);
        this.add(tf2);
        this.add(b);
 
        this.setFocusTraversalPolicy(new MyFocusTraversalPolicy());
        this.setFocusTraversalPolicyProvider(true);
 
        frame.add(this);
 
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        frame.pack();
    }
 
    private class MyFocusTraversalPolicy extends FocusTraversalPolicy {
 
        @Override
        public Component getComponentAfter(Container focusCycleRoot, Component aComponent) {
            focusNumber = (focusNumber + 1) % focusList.length;
            return focusList[focusNumber];
        }
 
        @Override
        public Component getComponentBefore(Container focusCycleRoot, Component aComponent) {
            focusNumber = (focusList.length + focusNumber - 1) % focusList.length;
            return focusList[focusNumber];
        }
 
        @Override
        public Component getDefaultComponent(Container focusCycleRoot) {
            return focusList[0];
        }
 
        @Override
        public Component getLastComponent(Container focusCycleRoot) {
            return focusList[focusList.length - 1];
        }
 
        @Override
        public Component getFirstComponent(Container focusCycleRoot) {
            return focusList[0];
        }
    }
 
    public static void main(String[] args) {
        new TabTest();
    }
}