1z0-816 Java SE 11 Programmer II Practice Questions

Function func = (@NonNull x) -> x.toUpperCase();

var v = “Hello” + (©Interned) “World”

Function func = (var @NonNull x) -> x.toUpperCaseQ;

Function func = (@NonNull var x) -> x.toUpperCase();

var myString = (@NonNull String) str;

var obj = new ©Interned MyObject();

input: Echo:

input: Helloworld Echo: Helloworld

input: Then block until any input comes from System.in.

input: Echo: Helloworld

A NullPointerException is thrown at run time.

ToDoubleFunction

Supplier

Bi Function

LongConsumer

Interfaces cannot have protected methods but abstract classes can.

Both interfaces and abstract classes can have final methods.

Interfaces cannot have instance fields but abstract classes can.

Interfaces cannot have static methods but abstract classes can.

Interfaces cannot have methods with bodies but abstract classes can.

double totalsalary = list.stream().map(e -> e.getSalary() * ratio).reduce(bo).ifPresent (p -> p.doubleValue());

double totalsalary = list.stream().mapToDouble(e -> e.getSalary() * ratio).sum;

double totalsalary = list.stream().map(Employee::getSalary * ratio).reduce(bo).orElse(0.0);

double totalsalary = list.stream().mapToDouble(e -> e.getSalaryQ * ratio).reduce(starts, bo);