import java.util.ArrayList;
import java.util.List;


public interface Predicate<T> {
    boolean test(T t);
}

interface Function<T, R> {
    R apply(T t);
}

interface Consumer<T> {
    void accept(T t);
}

interface Supplier<T> {
    T get();
}

interface BiFunction<T, U, R> {
    R apply(T t, U u);
}

interface TriFunction<T, U, V, R> {
    R apply(T t, U u, V v);
}

public class SuperClass {

    public SuperClass() {

    }

    public SuperClass(String s) {

    }

    void print(Integer val) {
        System.out.println(val);
    }

    static void print(Boolean val) {
        System.out.println(val);
    }

    boolean isEqual(Integer i, Integer j) {
        return i.equals(j);
    }

    boolean isEqualAsStrings(Integer i, String j) {
        return i.toString().equals(j);
    }

    int add(Integer i, Integer j) {
        return i + j;
    }

    String getOneNumberAsString(Integer i, Integer j, Integer k) {
        return i.toString();
    }

    int returnSameValue(Integer i) {
        return i;
    }

    String returnSameValue(String s) {
        return s;
    }
}

public class MethodReferences extends SuperClass {

    List<Integer> list = new ArrayList<>();

    void print(String s) {
        System.out.println(s);
    }

    boolean isAnyEqualToString5(List<Integer> list, BiFunction<Integer, String, Boolean> biFunction) {
        for (Integer integer : list) {
            if (biFunction.apply(integer, "5")) {
                return true;
            }
        }
        return false;
    }

    Function<Object, Integer> classMethod() {
        return Object::hashCode;
    }

    Function<SuperClass, Integer> superclassMethodNotOverridden() {
        return SuperClass::hashCode;
    }

    Function<String, Integer> superclassMethodOverridden() {
        return String::hashCode;
    }

    Function<Object, Integer> superclassMethodWithSubclassType() {
        return Object::hashCode;
    }

    Consumer<String> fieldAccessMethod() {
        return System.out::println;
    }

    Consumer<String> thisClassMethod() {
        return this::print;
    }

    Consumer<Integer> superclassMethod() {
        return super::print;
    }

    Function<Integer, Boolean> instanceMethod() {
        return list::add;
    }

    Supplier<SuperClass> zeroArgumentConstructor() {
        return SuperClass::new;
    }

    Function<String, SuperClass> singleArgumentConstructor() {
        return SuperClass::new;
    }

    Consumer<Boolean> staticMethod() {
        return SuperClass::print;
    }

    BiFunction<Integer, String, Boolean> biFunction() {
        return super::isEqualAsStrings;
    }

    TriFunction<Integer, Integer, Integer, String> customTriFunction() {
        return super::getOneNumberAsString;
    }

    void consumerDeclaredInMethod() {
        Consumer<String> stringConsumer = this::print;
    }

    void functionDeclaredInMethod() {
        Function<String, String> stringFunction = super::returnSameValue;
    }

    void biFunctionDeclaredInMethod() {
        BiFunction<Integer, Integer, Boolean> biFunction = super::isEqual;
    }

    void consumerUsedInStream() {
        list.stream().forEach(super::print);
    }

    void functionUsedInStream() {
        list.stream().map(super::returnSameValue);
    }

    void biFunctionUsedInStream() {
        list.stream().reduce(0, super::add);
    }

    void biFunctionInMethodCall() {
        isAnyEqualToString5(list, super::isEqualAsStrings);
    }
}
