最新 [2025年03月] 効果的な学習法でJPNTestの問題集で1z1-819テストを合格せよ [Q90-Q107]

最新 [2025年03月] 効果的な学習法でJPNTestの問題集で1z1-819テストを合格せよ

実績のある受験者のシミュレーションされた1z1-819試験PDF問題を試そう

試験に備えるために、候補者は、公式のOracleドキュメント、オンラインコース、練習問題、学習ガイドなど、さまざまな学習資料を活用することができます。試験を受ける前には、Javaプログラミングの経験が少なくとも6ヶ月あることが推奨されています。

質問 # 90
Given the code fragment:

What is the result?

A. 2 : 3
B. 2 : -1
C. -1 : 2
D. 3 : 0

正解：B

質問 # 91
Given:

Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

A. map.forEach((k, v) -> set(v)));
B. set(map)
C. super.set(map.values());
D. super.set(List<String> map)
E. set(map.values());

正解：C、E

質問 # 92
Given the code fragment:

What is the result?

A. false false true
B. false true false
C. true false false
D. false true true

正解：B

解説：

質問 # 93
Which code fragment compiles?

A. Option D
B. Option C
C. Option B
D. Option A

正解：A

解説：

質問 # 94
Given:

What is the result?

A. nullMary
B. JoeMarry
C. nullnull
D. Joenull

正解：A

解説：

質問 # 95
Given:

Which two statements are true if the method is added to Bar? (Choose two.)

A. public <T> Iterable<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
B. public <T> List<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
C. public <T> Collection<T> foo(Stream<T> arg) { ... } overloads Foo.foo.
D. public <T> Collection<T> foo(Collection<T> arg) { ... } overloads Foo.foo.
E. public Collection<String> foo(Collection<String> arg) { ... } overrides Foo.foo.
F. public <T> Collection<T> bar(Collection<T> arg) { ... } overloads Foo.foo.

正解：A、B

質問 # 96
Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?

A. The compilation fails because a final class cannot extend another class.
B. The compilation fails because there is no zero args constructor defined in class X.
C. The compilation fails because either class X or class Y needs to implement the toString() method.
D. The compilation succeeds.

正解：C

解説：

質問 # 97
Given:

What is the result?

A. 0
B. 1
C. 2
D. An exception is thrown at runtime.

正解：A

解説：

質問 # 98
Given:

Which two methods facilitate valid ways to read instance fields? (Choose two.)

A. getACount
B. getTotalCount
C. getTCount
D. getCCount
E. getGCount

正解：B、D

質問 # 99
Given:

Which make class thread safe?

A. Make setB synchronized.
B. Make foo and sets synchronized.
C. Class A is thread safe.
D. Make foo synchronized.
E. Make a synchronized.

正解：E

質問 # 100
Given:

What is the result?

A. nullMary
B. JoeMarry
C. nullnull
D. Joenull

正解：A

解説：

質問 # 101
Given the declaration:

In which two locations is it legal to apply the @Resource annotation?

A. Loc2
B. Loc4
C. Loc1
D. Loc3
E. Loc2

正解：A、D

質問 # 102
Given the code fragment:

You want to display the value of currency as $100.00.
Which code inserted on line 1 will accomplish this?

A. NumberFormat formatter = NumberFormat.getInstance(locale).getCurrency();
B. NumberFormat formatter = NumberFormat.getInstance(locale);
C. NumberFormat formatter = NumberFormat.getCurrency(locale);
D. NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);

正解：A

質問 # 103
Given the code fragment:

What is the result?

A. The compilation fails at line 16.
B. The compilation fails at line 13.
C. 0
D. 1
E. The compilation fails at line

正解：D

質問 # 104
A bookstore's sales are represented by a list of Sale objects populated with the name of the customer and the books they purchased.
public class Sale {
private String customer;
private List<Book> items;
// constructor, setters and getters not shown
}
public class Book {
private String name;
private double price;
// constructor, setters and getters not shown
}
Given a list of Sale objects, tList, which code fragment creates a list of total sales for each customer in ascending order?