具有非SAM接口的lambda的Java习惯用法

我发现的最优雅的方法是使用匿名桥：

    // SAM bridge with lambda implementation    window.addWindowListener(        WindowBridge.windowOpened( b -> System.out.println("opening via lambda!")        )    );

与SAM类型的情况类似，它比匿名适配器还干净：

    // non-SAM with adapter implementation with override    window.addWindowListener(        new WindowAdapter() { @Override public void windowOpened(Event e){     System.out.println("WindowAdapter opened via override!"); }        }    );

但是它确实需要带有静态工厂的桥，这有点尴尬：

import java.util.function.Consumer;public interface WindowBridge {    // SAM for this method    public abstract class WindowOpened extends WindowAdapter {        public abstract void windowOpened(Event e);    }    // factory bridge    public static WindowOpened windowOpened(Consumer<Event> c) {        return new WindowOpened() { public void windowOpened(Event e){     c.accept(e); }        };    }    // SAM for this method    public abstract class WindowClosing extends WindowAdapter {        public abstract void windowClosing(Event e);    }    // factory bridge    public static WindowClosing windowClosing(Consumer<Event> c) {        return new WindowClosing() { public void windowClosing(Event e){     c.accept(e); }        };    }}