Java 8 Lambda İfadeleri - yuvalanmış sınıftaki birden çok yöntem ne olacak?

Yeni özellikleri şu adreste okuyorum: http://www.javaworld.com/article/2078836/java-se/love-and-hate-for-java-8.html

Aşağıdaki örneği gördüm:

Anonim Sınıf Kullanımı:

button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent ae) {
        System.out.println("Action Detected");
    }
});

Lambda ile:

button.addActionListener(e -> {
    System.out.println("Action Detected");
});

MouseListenerAnonim sınıf içinde birden fazla yöntem uygulamak isteyen biri a ile ne yapardı , örneğin:

public void mousePressed(MouseEvent e) {
    saySomething("Mouse pressed; # of clicks: "
               + e.getClickCount(), e);
}

public void mouseReleased(MouseEvent e) {
    saySomething("Mouse released; # of clicks: "
               + e.getClickCount(), e);
}

... ve bunun gibi?

Yardımcı arabirimleri kullanarak çok yöntemli arabirimleri lambdalarla kullanabilirsiniz. Bu, istenmeyen yöntemlerin uygulamalarının önemsiz olduğu bu tür dinleyici arabirimleriyle çalışır (yani, MouseAdaptersundukları şeyi de yapabiliriz):

// note the absence of mouseClicked…
interface ClickedListener extends MouseListener
{
    @Override
    public default void mouseEntered(MouseEvent e) {}

    @Override
    public default void mouseExited(MouseEvent e) {}

    @Override
    public default void mousePressed(MouseEvent e) {}

    @Override
    public default void mouseReleased(MouseEvent e) {}
}

Böyle bir yardımcı arabirimi yalnızca bir kez tanımlamanız gerekir.

Şimdi bunun Component cgibi tıklama olayları için bir dinleyici ekleyebilirsiniz :

c.addMouseListener((ClickedListener)(e)->System.out.println("Clicked !"));

Gönderen JLS 9.8

İşlevsel bir arabirim, yalnızca bir soyut yönteme sahip olan ve dolayısıyla tek bir işlev sözleşmesini temsil eden bir arabirimdir.

Lambda'lar bu işlevsel arabirimleri gerektirir, bu nedenle tek yöntemleriyle sınırlıdır. Anonim arabirimlerin, çok yöntemli arabirimleri uygulamak için hala kullanılması gerekir.

addMouseListener(new MouseAdapter() {

    @Override
    public void mouseReleased(MouseEvent e) {
       ...
    }

    @Override
    public void mousePressed(MouseEvent e) {
      ...
    }
});

Lambda EG bu konuyu değerlendirdi. Birçok kütüphane, fonksiyonel arayüz bir şey haline gelmeden yıllar önce tasarlanmış olsalar bile, fonksiyonel arayüzler kullanır. Ancak bazen bir sınıfın birden fazla soyut yöntemi olduğu ve bunlardan yalnızca birini bir lambda ile hedeflemek istersiniz.

Burada resmi olarak önerilen model, fabrika yöntemlerini tanımlamaktır:

static MouseListener clickHandler(Consumer<MouseEvent> c) { return ... }

Bunlar doğrudan API'lerin kendileri tarafından yapılabilir (bunlar içindeki statik yöntemler MouseListenerolabilir) veya bakımcıların bu kolaylığı sunmamayı seçmesi durumunda başka bir kitaplıkta harici yardımcı yöntemler olabilir. Bunun gerekli olduğu durumlar kümesi küçük olduğundan ve geçici çözüm çok basit olduğundan, bu köşedeki durumu kurtarmak için dili daha da genişletmek zorlayıcı görünmüyordu.

Benzer bir numara ThreadLocal; yeni statik fabrika yöntemine bakın withInitial(Supplier<S>).

(Bu arada, bu sorun ortaya çıktığında, örnek hemen hemen her zaman ortaya çıkıyor MouseListener; bu, lambda dostu olmak isteyen ancak olmayan sınıfların aslında oldukça küçük olduğunu önerdiği için cesaret vericidir.)

Java ActionListeneryalnızca tek bir yöntemi uygulamalıdır ( actionPerformed(ActionEvent e)). Bu, Java 8 işlevine güzel bir şekilde uyar, böylece Java 8, bir ActionListener.

En MouseAdapteraz iki yöntem gerektirir, bu nedenle bir function.

Orijinal dinleyici arabirimi birden fazla yöntem içerse bile (tek satırlı) lambda işlev dinleyicileri yazmama izin veren adaptör sınıfları oluşturdum.

2 olayı tek bir olayı daraltan InsertOrRemoveUpdate bağdaştırıcısına dikkat edin.

Orijinal sınıfım aynı zamanda WindowFocusListener, TableModelListener, TableColumnModelListener ve TreeModelListener için uygulamalar içeriyordu, ancak bu, kodu 30000 karakterlik SO sınırının üzerine itti.

import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import org.slf4j.*;

public class Adapters {
  private static final Logger LOGGER = LoggerFactory.getLogger(Adapters.class);

  @FunctionalInterface
  public static interface AdapterEventHandler<EVENT> {
    void handle(EVENT e) throws Exception;

    default void handleWithRuntimeException(EVENT e) {
      try {
        handle(e);
      }
      catch(Exception exception) {
        throw exception instanceof RuntimeException ? (RuntimeException) exception : new RuntimeException(exception);
      }
    }
  }

  public static void main(String[] args) throws Exception {
    // -------------------------------------------------------------------------------------------------------------------------------------
    // demo usage
    // -------------------------------------------------------------------------------------------------------------------------------------
    JToggleButton toggleButton = new JToggleButton();
    JFrame frame = new JFrame();
    JTextField textField = new JTextField();
    JScrollBar scrollBar = new JScrollBar();
    ListSelectionModel listSelectionModel = new DefaultListSelectionModel();

    // ActionListener
    toggleButton.addActionListener(ActionPerformed.handle(e -> LOGGER.info(e.toString())));

    // ItemListener
    toggleButton.addItemListener(ItemStateChanged.handle(e -> LOGGER.info(e.toString())));

    // ChangeListener
    toggleButton.addChangeListener(StateChanged.handle(e -> LOGGER.info(e.toString())));

    // MouseListener
    frame.addMouseListener(MouseClicked.handle(e -> LOGGER.info(e.toString())));
    frame.addMouseListener(MousePressed.handle(e -> LOGGER.info(e.toString())));
    frame.addMouseListener(MouseReleased.handle(e -> LOGGER.info(e.toString())));
    frame.addMouseListener(MouseEntered.handle(e -> LOGGER.info(e.toString())));
    frame.addMouseListener(MouseExited.handle(e -> LOGGER.info(e.toString())));

    // MouseMotionListener
    frame.addMouseMotionListener(MouseDragged.handle(e -> LOGGER.info(e.toString())));
    frame.addMouseMotionListener(MouseMoved.handle(e -> LOGGER.info(e.toString())));

    // MouseWheelListenere
    frame.addMouseWheelListener(MouseWheelMoved.handle(e -> LOGGER.info(e.toString())));

    // KeyListener
    frame.addKeyListener(KeyTyped.handle(e -> LOGGER.info(e.toString())));
    frame.addKeyListener(KeyPressed.handle(e -> LOGGER.info(e.toString())));
    frame.addKeyListener(KeyReleased.handle(e -> LOGGER.info(e.toString())));

    // FocusListener
    frame.addFocusListener(FocusGained.handle(e -> LOGGER.info(e.toString())));
    frame.addFocusListener(FocusLost.handle(e -> LOGGER.info(e.toString())));

    // ComponentListener
    frame.addComponentListener(ComponentMoved.handle(e -> LOGGER.info(e.toString())));
    frame.addComponentListener(ComponentResized.handle(e -> LOGGER.info(e.toString())));
    frame.addComponentListener(ComponentShown.handle(e -> LOGGER.info(e.toString())));
    frame.addComponentListener(ComponentHidden.handle(e -> LOGGER.info(e.toString())));

    // ContainerListener
    frame.addContainerListener(ComponentAdded.handle(e -> LOGGER.info(e.toString())));
    frame.addContainerListener(ComponentRemoved.handle(e -> LOGGER.info(e.toString())));

    // HierarchyListener
    frame.addHierarchyListener(HierarchyChanged.handle(e -> LOGGER.info(e.toString())));

    // PropertyChangeListener
    frame.addPropertyChangeListener(PropertyChange.handle(e -> LOGGER.info(e.toString())));
    frame.addPropertyChangeListener("propertyName", PropertyChange.handle(e -> LOGGER.info(e.toString())));

    // WindowListener
    frame.addWindowListener(WindowOpened.handle(e -> LOGGER.info(e.toString())));
    frame.addWindowListener(WindowClosing.handle(e -> LOGGER.info(e.toString())));
    frame.addWindowListener(WindowClosed.handle(e -> LOGGER.info(e.toString())));
    frame.addWindowListener(WindowIconified.handle(e -> LOGGER.info(e.toString())));
    frame.addWindowListener(WindowDeiconified.handle(e -> LOGGER.info(e.toString())));
    frame.addWindowListener(WindowActivated.handle(e -> LOGGER.info(e.toString())));
    frame.addWindowListener(WindowDeactivated.handle(e -> LOGGER.info(e.toString())));

    // WindowStateListener
    frame.addWindowStateListener(WindowStateChanged.handle(e -> LOGGER.info(e.toString())));

    // DocumentListener
    textField.getDocument().addDocumentListener(InsertUpdate.handle(e -> LOGGER.info(e.toString())));
    textField.getDocument().addDocumentListener(RemoveUpdate.handle(e -> LOGGER.info(e.toString())));
    textField.getDocument().addDocumentListener(InsertOrRemoveUpdate.handle(e -> LOGGER.info(e.toString())));
    textField.getDocument().addDocumentListener(ChangedUpdate.handle(e -> LOGGER.info(e.toString())));

    // AdjustmentListener
    scrollBar.addAdjustmentListener(AdjustmentValueChanged.handle(e -> LOGGER.info(e.toString())));

    // ListSelectionListener
    listSelectionModel.addListSelectionListener(ValueChanged.handle(e -> LOGGER.info(e.toString())));

    // ...
    // enhance as needed
  }

  // @formatter:off
  // ---------------------------------------------------------------------------------------------------------------------------------------
  // ActionListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class ActionPerformed implements ActionListener {
    private AdapterEventHandler<ActionEvent> m_handler = null;
    public static ActionPerformed handle(AdapterEventHandler<ActionEvent> handler) { ActionPerformed adapter = new ActionPerformed(); adapter.m_handler = handler; return adapter; }
    @Override public void actionPerformed(ActionEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // ItemListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class ItemStateChanged implements ItemListener {
    private AdapterEventHandler<ItemEvent> m_handler = null;
    public static ItemStateChanged handle(AdapterEventHandler<ItemEvent> handler) { ItemStateChanged adapter = new ItemStateChanged(); adapter.m_handler = handler; return adapter; }
    @Override public void itemStateChanged(ItemEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // ChangeListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class StateChanged implements ChangeListener {
    private AdapterEventHandler<ChangeEvent> m_handler = null;
    public static StateChanged handle(AdapterEventHandler<ChangeEvent> handler) { StateChanged adapter = new StateChanged(); adapter.m_handler = handler; return adapter; }
    @Override public void stateChanged(ChangeEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // MouseListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class MouseClicked extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MouseClicked handle(AdapterEventHandler<MouseEvent> handler) { MouseClicked adapter = new MouseClicked(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseClicked(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class MousePressed extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MousePressed handle(AdapterEventHandler<MouseEvent> handler) { MousePressed adapter = new MousePressed(); adapter.m_handler = handler; return adapter; }
    @Override public void mousePressed(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class MouseReleased extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MouseReleased handle(AdapterEventHandler<MouseEvent> handler) { MouseReleased adapter = new MouseReleased(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseReleased(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class MouseEntered extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MouseEntered handle(AdapterEventHandler<MouseEvent> handler) { MouseEntered adapter = new MouseEntered(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseEntered(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class MouseExited extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MouseExited handle(AdapterEventHandler<MouseEvent> handler) { MouseExited adapter = new MouseExited(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseExited(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // MouseMotionListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class MouseDragged extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MouseDragged handle(AdapterEventHandler<MouseEvent> handler) { MouseDragged adapter = new MouseDragged(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseDragged(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class MouseMoved extends MouseAdapter {
    private AdapterEventHandler<MouseEvent> m_handler = null;
    public static MouseMoved handle(AdapterEventHandler<MouseEvent> handler) { MouseMoved adapter = new MouseMoved(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseMoved(MouseEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // MouseWheelListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class MouseWheelMoved extends MouseAdapter {
    private AdapterEventHandler<MouseWheelEvent> m_handler = null;
    public static MouseWheelMoved handle(AdapterEventHandler<MouseWheelEvent> handler) { MouseWheelMoved adapter = new MouseWheelMoved(); adapter.m_handler = handler; return adapter; }
    @Override public void mouseWheelMoved(MouseWheelEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // KeyListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class KeyTyped extends KeyAdapter {
    private AdapterEventHandler<KeyEvent> m_handler = null;
    public static KeyTyped handle(AdapterEventHandler<KeyEvent> handler) { KeyTyped adapter = new KeyTyped(); adapter.m_handler = handler; return adapter; }
    @Override public void keyTyped(KeyEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class KeyPressed extends KeyAdapter {
    private AdapterEventHandler<KeyEvent> m_handler = null;
    public static KeyPressed handle(AdapterEventHandler<KeyEvent> handler) { KeyPressed adapter = new KeyPressed(); adapter.m_handler = handler; return adapter; }
    @Override public void keyPressed(KeyEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class KeyReleased extends KeyAdapter {
    private AdapterEventHandler<KeyEvent> m_handler = null;
    public static KeyReleased handle(AdapterEventHandler<KeyEvent> handler) { KeyReleased adapter = new KeyReleased(); adapter.m_handler = handler; return adapter; }
    @Override public void keyReleased(KeyEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // FocusListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class FocusGained extends FocusAdapter {
    private AdapterEventHandler<FocusEvent> m_handler = null;
    public static FocusGained handle(AdapterEventHandler<FocusEvent> handler) { FocusGained adapter = new FocusGained(); adapter.m_handler = handler; return adapter; }
    @Override public void focusGained(FocusEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class FocusLost extends FocusAdapter {
    private AdapterEventHandler<FocusEvent> m_handler = null;
    public static FocusLost handle(AdapterEventHandler<FocusEvent> handler) { FocusLost adapter = new FocusLost(); adapter.m_handler = handler; return adapter; }
    @Override public void focusLost(FocusEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // ComponentListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class ComponentMoved extends ComponentAdapter {
    private AdapterEventHandler<ComponentEvent> m_handler = null;
    public static ComponentMoved handle(AdapterEventHandler<ComponentEvent> handler) { ComponentMoved adapter = new ComponentMoved(); adapter.m_handler = handler; return adapter; }
    @Override public void componentMoved(ComponentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class ComponentResized extends ComponentAdapter {
    private AdapterEventHandler<ComponentEvent> m_handler = null;
    public static ComponentResized handle(AdapterEventHandler<ComponentEvent> handler) { ComponentResized adapter = new ComponentResized(); adapter.m_handler = handler; return adapter; }
    @Override public void componentResized(ComponentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class ComponentShown extends ComponentAdapter {
    private AdapterEventHandler<ComponentEvent> m_handler = null;
    public static ComponentShown handle(AdapterEventHandler<ComponentEvent> handler) { ComponentShown adapter = new ComponentShown(); adapter.m_handler = handler; return adapter; }
    @Override public void componentShown(ComponentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class ComponentHidden extends ComponentAdapter {
    private AdapterEventHandler<ComponentEvent> m_handler = null;
    public static ComponentHidden handle(AdapterEventHandler<ComponentEvent> handler) { ComponentHidden adapter = new ComponentHidden(); adapter.m_handler = handler; return adapter; }
    @Override public void componentHidden(ComponentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // ContainerListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class ComponentAdded extends ContainerAdapter {
    private AdapterEventHandler<ContainerEvent> m_handler = null;
    public static ComponentAdded handle(AdapterEventHandler<ContainerEvent> handler) { ComponentAdded adapter = new ComponentAdded(); adapter.m_handler = handler; return adapter; }
    @Override public void componentAdded(ContainerEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class ComponentRemoved extends ContainerAdapter {
    private AdapterEventHandler<ContainerEvent> m_handler = null;
    public static ComponentRemoved handle(AdapterEventHandler<ContainerEvent> handler) { ComponentRemoved adapter = new ComponentRemoved(); adapter.m_handler = handler; return adapter; }
    @Override public void componentRemoved(ContainerEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // HierarchyListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class HierarchyChanged implements HierarchyListener {
    private AdapterEventHandler<HierarchyEvent> m_handler = null;
    public static HierarchyChanged handle(AdapterEventHandler<HierarchyEvent> handler) { HierarchyChanged adapter = new HierarchyChanged(); adapter.m_handler = handler; return adapter; }
    @Override public void hierarchyChanged(HierarchyEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // PropertyChangeListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class PropertyChange implements PropertyChangeListener {
    private AdapterEventHandler<PropertyChangeEvent> m_handler = null;
    public static PropertyChange handle(AdapterEventHandler<PropertyChangeEvent> handler) { PropertyChange adapter = new PropertyChange(); adapter.m_handler = handler; return adapter; }
    @Override public void propertyChange(PropertyChangeEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // WindowListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class WindowOpened extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowOpened handle(AdapterEventHandler<WindowEvent> handler) { WindowOpened adapter = new WindowOpened(); adapter.m_handler = handler; return adapter; }
    @Override public void windowOpened(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class WindowClosing extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowClosing handle(AdapterEventHandler<WindowEvent> handler) { WindowClosing adapter = new WindowClosing(); adapter.m_handler = handler; return adapter; }
    @Override public void windowClosing(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class WindowClosed extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowClosed handle(AdapterEventHandler<WindowEvent> handler) { WindowClosed adapter = new WindowClosed(); adapter.m_handler = handler; return adapter; }
    @Override public void windowClosed(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class WindowIconified extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowIconified handle(AdapterEventHandler<WindowEvent> handler) { WindowIconified adapter = new WindowIconified(); adapter.m_handler = handler; return adapter; }
    @Override public void windowIconified(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class WindowDeiconified extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowDeiconified handle(AdapterEventHandler<WindowEvent> handler) { WindowDeiconified adapter = new WindowDeiconified(); adapter.m_handler = handler; return adapter; }
    @Override public void windowDeiconified(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class WindowActivated extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowActivated handle(AdapterEventHandler<WindowEvent> handler) { WindowActivated adapter = new WindowActivated(); adapter.m_handler = handler; return adapter; }
    @Override public void windowActivated(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class WindowDeactivated extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowDeactivated handle(AdapterEventHandler<WindowEvent> handler) { WindowDeactivated adapter = new WindowDeactivated(); adapter.m_handler = handler; return adapter; }
    @Override public void windowDeactivated(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // WindowStateListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class WindowStateChanged extends WindowAdapter {
    private AdapterEventHandler<WindowEvent> m_handler = null;
    public static WindowStateChanged handle(AdapterEventHandler<WindowEvent> handler) { WindowStateChanged adapter = new WindowStateChanged(); adapter.m_handler = handler; return adapter; }
    @Override public void windowStateChanged(WindowEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // DocumentListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class DocumentAdapter implements DocumentListener {
    @Override public void insertUpdate(DocumentEvent e) { /* nothing */ }
    @Override public void removeUpdate(DocumentEvent e) { /* nothing */ }
    @Override public void changedUpdate(DocumentEvent e) { /* nothing */ }
  }

  public static class InsertUpdate extends DocumentAdapter {
    private AdapterEventHandler<DocumentEvent> m_handler = null;
    public static InsertUpdate handle(AdapterEventHandler<DocumentEvent> handler) { InsertUpdate adapter = new InsertUpdate(); adapter.m_handler = handler; return adapter; }
    @Override public void insertUpdate(DocumentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class RemoveUpdate extends DocumentAdapter {
    private AdapterEventHandler<DocumentEvent> m_handler = null;
    public static RemoveUpdate handle(AdapterEventHandler<DocumentEvent> handler) { RemoveUpdate adapter = new RemoveUpdate(); adapter.m_handler = handler; return adapter; }
    @Override public void removeUpdate(DocumentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class InsertOrRemoveUpdate extends DocumentAdapter {
    private AdapterEventHandler<DocumentEvent> m_handler = null;
    public static InsertOrRemoveUpdate handle(AdapterEventHandler<DocumentEvent> handler) { InsertOrRemoveUpdate adapter = new InsertOrRemoveUpdate(); adapter.m_handler = handler; return adapter; }
    @Override public void insertUpdate(DocumentEvent e) { m_handler.handleWithRuntimeException(e); }
    @Override public void removeUpdate(DocumentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  public static class ChangedUpdate extends DocumentAdapter {
    private AdapterEventHandler<DocumentEvent> m_handler = null;
    public static ChangedUpdate handle(AdapterEventHandler<DocumentEvent> handler) { ChangedUpdate adapter = new ChangedUpdate(); adapter.m_handler = handler; return adapter; }
    @Override public void changedUpdate(DocumentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // AdjustmentListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class AdjustmentValueChanged implements AdjustmentListener {
    private AdapterEventHandler<AdjustmentEvent> m_handler = null;
    public static AdjustmentValueChanged handle(AdapterEventHandler<AdjustmentEvent> handler) { AdjustmentValueChanged adapter = new AdjustmentValueChanged(); adapter.m_handler = handler; return adapter; }
    @Override public void adjustmentValueChanged(AdjustmentEvent e) { m_handler.handleWithRuntimeException(e); }
  }

  // ---------------------------------------------------------------------------------------------------------------------------------------
  // ListSelectionListener
  // ---------------------------------------------------------------------------------------------------------------------------------------
  public static class ValueChanged implements ListSelectionListener {
    private AdapterEventHandler<ListSelectionEvent> m_handler = null;
    public static ValueChanged handle(AdapterEventHandler<ListSelectionEvent> handler) { ValueChanged adapter = new ValueChanged(); adapter.m_handler = handler; return adapter; }
    @Override public void valueChanged(ListSelectionEvent e) { m_handler.handleWithRuntimeException(e); }
  }
  // @formatter:on
}

Varsayılan yöntemlere lambda ifadeleri içinden erişilemez. Aşağıdaki kod derlenmez:

interface Formula {
    double calculate(int a);

    default double sqrt(int a) {
        return Math.sqrt(a);
    }
}
Formula formula = (a) -> sqrt( a * 100);

yalnızca işlevsel arayüzle çalışır (yalnızca tek soyut yöntem + herhangi bir sayıda varsayılan yöntem) bu nedenle lambda ifadesi yalnızca soyut yöntemle çalışır