1Z1-816無料問題集「Oracle Java SE 11 Programmer II」

質問 1

Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

（A）Interfaces cannot have methods with bodies but abstract classes can.

（B）Interfaces cannot have instance fields but abstract classes can.

（C）Interfaces cannot have protected methods but abstract classes can.

（D）Interfaces cannot have static methods but abstract classes can.

（E）Both interfaces and abstract classes can have final methods.

正解：B、C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 2

Which statement about a functional interface is true?

（A）It must be defined with the public access modifier.

（B）It must be annotated with @FunctionalInterface.

（C）It is declared with a single default method.

（D）It cannot have any private methods and static methods.

（E）It is declared with a single abstract method.

正解：E 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 3

Given:

Which two independent changes will make the Main class compile? (Choose two.)

（A）Change line 1 to public class Student {.

（B）Move the entire Student class declaration to a separate Java file, Student.java.

（C）Change line 1 to static class Student {.

（D）Change line 2 to public Student(String classname).

（E）Change line 3 to Student student = new Student("Biology");.

正解：D、E 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 4

Given:
List<String> longlist = List.of("Hello","World","Beat");
List<String> shortlist = new ArrayList<>();
Which code fragment correctly forms a short list of words containing the letter "e"?

（A）Option D

（B）Option B

（C）Option C

（D）Option A

正解：C 解答を投票する

質問 5

Which interface in the java.util.function package can return a primitive type?

（A）LongConsumer

（B）BiFunction

（C）Supplier

（D）ToDoubleFunction

正解：D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 6

Given:

Which annotation should be used to remove warnings from compilation?

（A）@SuppressWarnings on the main and print methods

（B）@SuppressWarnings("all") on the main and print methods

（C）@SuppressWarnings("rawtypes") on main and @SafeVarargs on the print method

（D）@SuppressWarnings("unchecked") on main and @SafeVarargs on the print method

正解：D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 7

Assuming the Widget class has a getPrice method, this code does not compile:

Which two statements, independently, would allow this code to compile? (Choose two.)

（A）Replace line 5 with widgetStream.filter(a -> ((Widget)a).getPrice() > 20.00).

（B）Replace line 1 with List<Widget> widgetStream = widgets.stream();.

（C）Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.

（D）Replace line 5 with widgetStream.filter((Widget a) -> a.getPrice() > 20.00).

正解：A、C 解答を投票する

質問 8

Given:

Which two interfaces can be used in lambda expressions? (Choose two.)

（A）MyInterface5

（B）MyInterface2

（C）MyInterface4

（D）MyInterface1

（E）MyInterface3

正解：A、B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

1Z1-816 無料問題集「Oracle Java SE 11 Programmer II」

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