[2023年07月] 問題集簡単概要1Z0-819試験問題GoShiken [Q71-Q95]

[2023年07月] 問題集簡単概要1Z0-819試験問題GoShiken

1Z0-819トレーニング認証最新版をゲットOracle Java SE

Oracle 1z1-819（Java SE 11 Developer）認定試験は、Javaプログラミングにおけるスキルと知識を検証したい開発者を対象としています。この試験は、候補者のJavaアプリケーションの開発とメンテナンスの能力、およびJavaプログラミング言語の重要なコンセプトの理解力を測定します。この試験に合格すると、Java開発の専門知識を証明し、業界での就職の可能性を高めることができます。

この試験は、80問の複数選択問題で構成されており、180分以内に回答する必要があります。試験に合格するには、最低63%のスコアを達成する必要があります。この試験は、英語、日本語、中国語、ポルトガル語など、複数の言語で利用可能です。

 

質問 # 71
Given:

What is the result?

• A. 1.99,2.99,0.0
• B. 1.99,2.99,0
• C. 1.99,2.99
• D. The compilation fails.

正解：D

解説：

質問 # 72
Given the Person class with age and name along with getter and setter methods, and this code fragment:

What will be the result?

• A. Tom Aman Peter
• B. Aman Tom Peter
• C. Aman Peter Tom
• D. Tom Peter Aman

正解：C

質問 # 73
Given the code fragment:
List<Integer> list = List.of(11,12,13,12,13);
Which statement causes a compile time error?

• A. Double d = list.get(0);
• B. double f = list.get(0);
• C. int c =list.get(0);
• D. Integer a = Integer.valueOf(list.get(0));
• E. Double e = Double.valueOf(list.get(0));
• F. Integer b = list.get(0);

正解：D

質問 # 74
Given:

Which would cause s to be AQCD?

• A. s.replace(s.indexOf("A"), s.indexOf("B"), "Q");
• B. s.replace(s.indexOf("A"), s.indexOf("C"), "Q");
• C. s.replace(s.indexOf("B"), s.indexOf("B"), "Q");
• D. s.replace(s.indexOf("B"), s.indexOf("C"), "Q");

正解：D

質問 # 75
Given:

You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?

• A. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
• B. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• C. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• D. Stream<String> lines = Files.lines(INPUT_FILE_NAME);

正解：C

質問 # 76
Given:

Which code, when inserted at one or more marked positions, would allow classes B and C to compile?

• A. @Override // position 3void x () {} // position 3@Override // position 3public void z() { } // position 3
• B. implements A // position 1@Override // position 2
• C. @Override // position 2public void z() { } // position 3
• D. public void z() { } // position 3

正解：C

質問 # 77
Given these declarations:

and these two code fragments:
Fragment 1:

Fragment 2:

Which code fragment is preferred and why?

• A. Fragment 1 because it is more performant.
• B. Fragment 1 because it is shorter.
• C. Fragment 2 because it prevents SQL injection.
• D. Fragment 2 because it explicitly specifies the SQL types of the column values.

正解：C

質問 # 78
Given:

What is the result?

• A. [A, B, C]
  [A, B, C]
• B. On line 9, an exception is thrown at run time.
• C. [A, B, C]
  followed by an exception thrown on line 11.
• D. [A, B, C]
  [A, B]

正解：A

解説：

質問 # 79
Given:

Which expression when added at line 1 will produce the output of 1.17?

• A. float z = Math.round((int)(x/y),2);
• B. float z = (float)(Math.round((float)x/y*100)/100);
• C. float z = Math.round((float)x/y*100)/(float)100;
• D. float z = Math.round((float)x/y,2);

正解：C

解説：

質問 # 80
Given:

What is the result?

• A. Take extra care
  Take extra care
• B. An exception is thrown at runtime
• C. The program prints nothing.
• D. Take extra care

正解：B

質問 # 81
Given the code fragment:

What is the result?

• A. 0
• B. 1
• C. 2
• D. 3

正解：D

質問 # 82
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 D
• C. Option A
• D. Option B

正解：D

質問 # 83
Given the code fragment:

What is the result?

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

正解：B

解説：

質問 # 84
Given:

You want to calculate the average of the Player's score.
Which statement inserted on line 1 will accomplish this?

• A. players.stream().mapToDouble(a -> a.score).average();
• B. players.stream().average().orElse(0.0);
• C. players.stream().mapToInt(a -> a.score).average().orElse(0.0);
• D. players.stream().map(a -> a.score).average();

正解：C

質問 # 85
Given the code fragment:
public void foo(Function<Integer, String> fun) {...}
Which two compile? (Choose two.)

• A. foo( n -> n + 1 )
• B. foo( toHexString )
• C. foo( Integer::toHexString )
• D. foo( int n -> Integer.toHexString(n) )
• E. foo( n -> Integer.toHexString(n) )
• F. foo( n -> Integer::toHexString )
• G. foo( (int n) -> Integer.toHexString(n) )
• H. foo( n::toHexString )

正解：A、E

解説：
Explanation/Reference:

質問 # 86
Given:

What is the output?

• A. 0
• B. 1
• C. 2
• D. Exception

正解：B

解説：

質問 # 87
Given:
List<String> list1 = new ArrayList<>();
list1.add("A");
list1.add("B");
List list2 = List.copyOf(list1);
list2.add("C");
List<List<String>> list3 = List.of(list1, list2);
System.out.println(list3);
What is the result?

• A. An exception is thrown at run time.
• B. [[A, B, C], [A, B, C]]
• C. [[A, B], [A, B, C]]
• D. [[A, B],[A, B]]

正解：A

解説：

質問 # 88
Given:

If file "App.config" is not found, what is the result?

• A. nothing
• B. Exception in thread "main" java.lang.Error:Fatal Error: Configuration File, App.config, is missing.
• C. Configuration is OK
• D. The compilation fails.

正解：D

解説：

質問 # 89
Given:

And the command:
java Main Helloworld
What is the result ?

• A. A NullPointerException is thrown at run time.
• B. Input: Echo:
• C. Input: Then block until any input comes from System.in.
• D. Input: Helloworld Echo: Helloworld
• E. Input: Echo: Helloworld

正解：C

解説：

質問 # 90
Given:

What is the result?

• A. The code does not compile.
• B. Value of Euler = "2.71828"
• C. Value of Euler = 2.71828
• D. It throws a runtime exception.

正解：A

質問 # 91
Given the content:

What Is the result?
A)

B)

C)

D)

E)
User Username

• A. Option B
• B. Option D
• C. Option
• D. Option C
• E. Option A

正解：B、C

質問 # 92
Which two safely validate inputs? (Choose two.)

• A. Accept only valid characters and input values.
• B. Assume inputs have already been validated.
• C. Delegate numeric range checking of values to the database.
• D. Modify the input values, as needed, to pass validation.
• E. Use trusted domain-specific libraries to validate inputs.

正解：A、C

質問 # 93
Given:

Which statement is true?

• A. All classes from the package java.time. are loaded for the class Diary.
• B. Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.
• C. Tester must import java.time.LocalDate in order to compile.
• D. Only LocalDate class from java.time package is loaded.

正解：B

質問 # 94
Given:

What is the result?

• A. [0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet
• B. [0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet
• C. [0,0] = Red[1,0] = Black[2,0] = Blue
• D. java.lang.ArrayIndexOutOfBoundsException thrown

正解：B

解説：

質問 # 95
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