[2025年01月04日]1z1-819テスト準備できるトレーニング練習テスト試験問題 [Q106-Q122]

[2025年01月04日]1z1-819テスト準備できるトレーニング練習テスト試験問題

試験問題解答ブレーン問題集で1z1-819試験問題集PDFを使おう

Oracle 1z1-819試験は、60の多肢選択問題から成り、制限時間は150分です。この試験は英語と日本語で利用可能で、対面またはオンラインで受験することができます。試験に合格するには、少なくとも63％以上のスコアを取得する必要があります。試験に不合格の場合は、14日の待機期間後に再度受験することができます。

質問 # 106
Given:

and

What is the result?

A. A ClassCastException is thrown at run time.
B. A NullPointerException is thrown at run time.
C. The compilation fails.
D. 1
Null
null
E. 1
1
1

正解：C

解説：

質問 # 107
Given:

What code inserted into class C would allow it to compile?

A. void x() { }
public void y() { }
public void z() { }
B. void x() { }
public void z() { }
C. public void x() { }
public void z() { }
D. void x() { super.y(); }
public void z() { }
E. public void x() { }
protected void y() { super.y(); }
public void z() { }

正解：C

質問 # 108
Given these two classes:

And given this fragment:

Which describes the fragment?

A. It is subject to deadlock.
B. The code does not compile.
C. It is subject to livelock.
D. It throws IllegalMonitorStateException.

正解：B

質問 # 109
Given the code fragment from Box. Java:

Given the code fragment from item.java:

Given the information:
The classes Box and items are encapsulated with getters and setters methods. The classes Box and Item contains required constructors source code.
and the code fragment:

Which action serializes the b1 object?

A. Implement the Serializable interface in the item class.
B. Handle NoteSerilaizeableException in the try clause or throw in the main() method definition.
C. Add SerialVersionID to the Box and item class
D. Override readObject () and writeObject () method in the Book class.
E. Remove out.flush () method invocation.

正解：A

質問 # 110
Given:

You want to implement the java.io.Serializable interface to the MyPersistenceData class.
Which method should be overridden?

A. the writeExternal method
B. nothing
C. the readExternal method
D. the readExternal and writeExternal method

正解：D

質問 # 111
Given the code fragment:

What is the result?

A. 0
B. 0 8
C. 0 8 10
D. 0 4 9
E. The code prints nothing.

正解：B

解説：
Explanation
A picture containing graphical user interface Description automatically generated

質問 # 112
Given:

executed using command:
java Hello "Hello World" Hello World
What is the output?

A. HelloHello WorldHelloWorld
B. Hello WorldHello World
C. An exception is thrown at runtime.
D. Hello WorldHelloWorld
E. Hello World Hello World

正解：E

質問 # 113
Given:

What is the expected result of javac?

A. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist
B. javac compiles Mycar.java without errors or warnings.
C. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error:
expected import java.lang
D. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class

正解：B

質問 # 114
Given:

Which one is correct?

A. An IllegalThreadStateException is thrown at run time.
B. The compilation fails.
C. Four threads are created.
D. Three threads are created.

正解：A

解説：

質問 # 115
Given:

Which three classes successfully override showFirst ()?

正解：A

質問 # 116
Which two var declarations are correct? (Choose two.)

A. var names = new ArrayList<>();
B. var a;
C. var _ = 100;
D. var var = "hello";
E. var y = null;

正解：A、D

質問 # 117
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 compiles successfully.
D. The code fails to compile as try-try-resource needs a variable declaration such as MyResource r1= res1; MyResource r2 = res2;.

正解：C

質問 # 118
Given:

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