あなたを合格させる1z1-819お手軽に試験合格リアル1z1-819練習問題集で更新されたのは2025年04月25日 [Q25-Q49]

あなたを合格させる1z1-819お手軽に試験合格リアル1z1-819練習問題集で更新されたのは2025年04月25日

2025年最新の実際に出ると確認されたで無料Oracle 1z1-819試験問題

Oracle 1Z0-819試験は、重要な準備と研究を必要とする挑戦的なテストです。候補者は、Javaプログラミングの強力な基盤を持ち、実際のシナリオに知識を適用できる必要があります。試験の準備をするために、候補者は、Oracleの公式研究ガイド、オンライントレーニングコース、練習試験など、さまざまなリソースを利用できます。

この試験では、Java開発に関連する様々なトピックをカバーしており、Java構文とデータ型、オブジェクト指向プログラミング、Javaコレクション、Java I/O、Java並列処理、およびJavaデータベース接続などが含まれます。試験形式は多肢選択問題で、合格スコアは68％以上が必要です。試験はオンラインで受けることができますが、試験に挑む前に候補者が十分に準備することが推奨されています。

質問 # 25
Given:

What action ensures successful compilation?

A. Replace public Color(int c) with private Color(int c).
B. Replace enum Color implements Serializable with public enum Color.
C. Replace int c; with private final int c;.
D. Replace enum Color with public enum Color.
E. Replace int c; with private int c;.

正解：A

解説：

質問 # 26
Given:

What is the output?

A. I am an object
B. The compilation fails due to an error in line 1.
C. I am an object array
D. I am an array

正解：A

質問 # 27
Given
:

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

B)

C)

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

正解：C

質問 # 28
Given the Customer table structure:
* ID Number Primary Key
* NAME Text Nullable
Given code fragment:

Which statement inserted on line 14 sets NAME column to a NULL value?

A. Stmt.setNull(2, null);
B. Stmt.setNull(2 string, class);
C. Stmt.setNull(2, java.lang, string);
D. Stmt.setNull(2, java,sql. Types, VARCHAR);

正解：D

質問 # 29
Given:

What is the result?

A. 0
B. The compilation fails.
C. 1
D. An exception is thrown at runtime.

正解：B

質問 # 30
Give:

And the code fragment:

Which three code fragments, at line n1 prints SPRING?

A. System.out.printin (sA(1)};
B. System.out.printin(Season,values(1)};
C. System.out.printin(Season.SPRING);
D. System.out.printin (sa(0)}:
E. System.out.printin (Season.valueof(''SPRING").ordinal() );
F. System.out.printin(Season.valueOf(''SPRING"). Ordinal() );
G. System.out.printin (Season.valueof ('s') );

正解：A、C、E

質問 # 31
Given:

Which is true?

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

正解：B

質問 # 32
Given:

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

A. MyInterface5
B. MyInterface1
C. MyInterface4
D. MyInterface2
E. MyInterface3

正解：A、D

質問 # 33
Given:

What is the result?

A. 6104 3
B. 0
C. 6910 3
D. 10126 3

正解：A

解説：

質問 # 34
Given:

Which statement is true about the Fox class?

A. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
B. Fox class does not have to override inhabit method, so long as it does not try to call it.
C. The inhabit method implementation from the first interface that Fox implements will take precedence.
D. Fox class must implement either Forest or Town interfaces, but not both.
E. Fox class must provide implementation for the inhabit method.

正解：A

質問 # 35
Given:
/code/a/Test.java
containing:

and
/code/b/Best.java
containing:
package b;
public class Best { }
Which is the valid way to generate bytecode for all classes?

A. javac -d /code /code/a/Test.java
B. javac -d /code /code/a/Test
C. java /code/a/Test.java /code/b/Best.java
D. javac -d /code /code/a/Test.java /code/b/Best.java
E. java /code/a/Test.java
F. java -cp /code a.Test

正解：D

質問 # 36
Given the declaration:

Examine this code fragment:
/* Loc1 */ class ProcessOrders { ... }
Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)

A. @Resource(name="Customer1")
B. @Resource(priority=100)
C. @Resource(priority=0)
D. @Resource(name="Customer1", priority=100)
E. @Resource

正解：B、C

質問 # 37
Given these classes:

And this code fragment:

What is the result?

A. The program fails to compile.
B. The program prints: A
C. The program prints: c
D. The program throws an exception.

正解：D

質問 # 38
Given:

What is the type of x?

A. String
B. char
C. List<Character>
D. List<String>

正解：A

質問 # 39
Given:

Which statement on line 1 enables this code fragment to compile?

A. Function<String> function = m -> m.toUpperCase();
B. Function function = String::toUpperCase;
C. UnaryOperator function = s -> s.toUpperCase();
D. UnaryOperator<String> function = String::toUpperCase;

正解：D

解説：

質問 # 40
Given TripleThis.java:

Compiling TripleThis.java gives this compiler warning:
Note: TripleThis.java uses unchecked or unsafe operations.
Which two replacements done together remove this compiler warning?

A. Replace line 9 with function<Integer>, Integer> = X -> { return (integer) x * 3; }.
B. Replace line 12 with public static int printValue function<Integer, Integer>, f, T num {.
C. Replace line 9 with function<Integer> tripler = x-> - { return (Integer) X * 3 ; }.
D. Replace line 12 with public static <T> void printValue (Function<T, T> f, T num ) {,
E. Replace line 12 with public static void printValue function<Integer> f, int num) {.

正解：B、C

質問 # 41
Given:

A) An exception is thrown at run time.
B)

C) The compilation fails due to an error on line 2.
D) The compilation fails due to an error on line 1.
E)

F)
The compilation fails due to an error on line 3.

A. Option C
B. Option F
C. Option B
D. Option D
E. Option A
F. Option E

正解：E

質問 # 42
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);
B. NumberFormat formatter = NumberFormat.getInstance(locale).getCurrency();
C. NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
D. NumberFormat formatter = NumberFormat.getCurrency(locale);

正解：B

質問 # 43
What change will cause the code to compile successfully?

A. Insert PriceChecker <> prod on line 1.
B. Insert PriceChecker (?) prod on line 1.
C. Insert PriceChecker <Electronics> prod on line 1.
D. Insert PriceChecker <Plushy extends Products> prod on line 1.

正解：B

質問 # 44
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)