/** 
 * Created by Jango on 10/2/2016. 
 */ 
public class Main { 
    public static final String PU = "jpatest"; 

    public static void main(String[] args) { 
        Promise promise = empty(); 
        promise.err2((throwable, o) -> { 
            Throwable throwa = throwable; 
            Object kk = o; 
        }) 
        ; 
    } 

    private static Promise empty() { 
        return null; 
    } 

    private interface Promise<T> { 
        Promise<T> err2(Error2Handler errorHandler); 
    } 

    public interface Error2Handler<T> extends Consumer2Unckd<Throwable, T> { 
        @Override 
        void accept(Throwable throwable, T t) throws Throwable; 
    } 

    public interface Consumer2Unckd<T1, T2> { 
        void accept(T1 t1, T2 t2) throws Throwable; 
    } 
}