無料1z1-819試験ブレーン問題集認定ガイド問題と解答 [Q58-Q76]

無料1z1-819試験ブレーン問題集認定ガイド問題と解答

1z1-819認定概要最新の1z1-819PDF問題集

Oracle 1Z0-819 認定試験は、開発者の Java SE 11 の熟練度を評価するために設計されています。この試験は、以前の Java SE 8 認定試験のアップグレードであり、最新の Java テクノロジーに追いつきたい開発者に適しています。この試験に合格することで、開発者が Java SE 11 を使用して堅牢なアプリケーションを開発するために必要なスキルと知識を持っていることが証明されます。

Oracle 1Z0-819試験は、Javaの文法とデータ型、オブジェクト指向プログラミングの概念、高度なJavaプログラミング技術など、幅広いトピックをカバーしています。また、並行処理、I/Oストリーム、データベース接続などのトピックも含まれます。この試験に備えるために、候補者はJavaプログラミング言語の堅固な理解とJavaアプリケーションの開発経験が必要です。さらに、Java Development Kit（JDK）やその他のJava開発ツールにも精通している必要があります。

Oracle 1Z1-819試験は、Javaプログラミングとその関連技術の専門知識を実証したい個人を対象としています。また、Java開発者またはソフトウェアエンジニアとしてのキャリアを追求したい人にとっても貴重な認定です。この認定は世界的に認識されており、IT業界の雇用主から非常に尊敬されています。

質問 # 58
Given:

What is the result?

A. abcd
B. The compilation fails.
C. adf
D. abdf
E. abd

正解：A

質問 # 59
Consider this method declaration:

A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?

A. B, because all values provided by the calling code should be enquoted.
B. B, because enquoting values provided by the calling code prevents SQL injection.
C. A and B are functionally equivalent.
D. A, because it is unnecessary to enclose identifiers in quotes.
E. A, because it sends exactly the value of user provided by the calling code.

正解：E

質問 # 60
Given the code fragment:
What is the result?

A. A compilation error is thrown.
B. [Kale, Lettuce]
[Salmon, Seabass]
C. [Lettuce, Kale]
[Seabass, Salmon]
D. [Lettuce, Kale]

正解：A

質問 # 61
Given:

Which is true?

A. System.out is the standard output stream. The stream is open only when System.out is called.
B. System.in cannot reassign the other stream.
C. System.in is the standard input stream. The stream is already open.
D. System.out is an instance of java.io.OutputStream by default.

正解：C

質問 # 62
Given:

Which statement is true?

A. The code fails to compile as res2 should be declared as final.
B. The code fails to compile as MyResource must implement Closeable.
C. The code fails to compile as try-try-resource needs a variable declaration such as MyResource r1= res1; MyResource r2 = res2;.
D. The code compiles successfully.

正解：D

質問 # 63
Which is a proper JDBC URL?

A. jdbe.mysql.com://localhost:3306/database
B. jdbc:mysql://localhost:3306/database
C. http://localhost
mysql.jdbc:3306/database
D. http://localhost.mysql.com:3306/database

正解：B

質問 # 64
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 C
B. Option B
C. Option A
D. Option D

正解：D

質問 # 65
Given:

What will secure this code from a potential Denial of Service condition?

A. On Line 3, enclose processData(dataReader) with try with resources.
B. Before Line 1, check the size of dataFiles to make sure it does not exceed a threshold.
C. After Line 4, add indexReader.close().
D. After Line 3, add dataReader.close().
E. On Line 1, use try with resources when opening each dataReader.

正解：A

質問 # 66
Given:

Which two are correct? (Choose two.)

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

正解：A、D

質問 # 67
Given:

Which statement is equivalent to line 1?

A. double totalSalary = list.stream().mapToDouble(e -> e.getSalary() * ratio).sum;
B. double totalSalary = list.stream().map(e -> e.getSalary() * ratio).reduce (bo).ifPresent (p -> p.doubleValue());
C. double totalSalary = list.stream().mapToDouble(e -> e.getSalary() * ratio).reduce(starts, bo);
D. double totalSalary = list.stream().map(Employee::getSalary * ratio).reduce (bo).orElse(0.0);

正解：D

解説：

質問 # 68
Given:

Examine these requirements:
* Eliminate code duplication.
* Keep constant the number of methods other classes may implement from this interface.
Which method can be added to meet these requirements?

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

正解：D

質問 # 69
Given the code fragment:
Which two code fragments, independently, replace line 1 to implement the equivalent reduce operation?

正解：D、E

質問 # 70
Which three initialization statements are correct? (Choose three.)

A. short sh = (short)'A';
B. String contact# = "(+2) (999) (232)";
C. boolean false = (4 != 4);
D. int[][][] e = {{1,1,1},{2,2,2}};
E. float x = 1f;
F. byte b = 10;
char c = b;
G. int x = 12_34;

正解：A、E、G

質問 # 71
Given:

Assume the file on path does not exist. What is the result?

A. /u01/work/filestore.txt is not deleted.
B. /u01/work/filestore.txt is deleted.
C. The compilation fails.
D. Exception

正解：C

解説：

質問 # 72
Given:

Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)

A. setCCount(c) = cCount;
B. tCount = tCount;
C. cCount = setCCount(c);
D. setGCount(g);
E. aCount = a;

正解：B、E

質問 # 73
Given:

What is the correct definition of the JsonField annotation that makes the Point class compile?

正解：C

質問 # 74
Given the content from the course.txt file:

Which code fragment at line 1 prints the lines that contain Java from the course.txt file?
A)

B)

C)

D)

E)