import java.util.function.Predicate;

import java.util.function.Supplier;

public class LambdaExtra

{

public static void main(String ... args) {

Predicate<Manager> isGood = manager -> false;

testEmployee(emp -> false);

// compile error

// testEmployee(manager -> isGood.test(manager));

// testEmployee2(manager -> isGood.test(manager));

testEmployee((Manager manager) -> isGood.test(manager));

testEmployee2((Manager manager) -> isGood.test(manager));

}

public static Employee createEmployee(Supplier<? extends Employee> factory) {

return factory.get();

}

public static <E extends Employee> boolean testEmployee(Predicate<E> theTest) {

return theTest.test(null);

}

public static boolean testEmployee2(Predicate<? extends Employee> theTest) {

return theTest.test(null);

}

}