無料で使える1Z0-819サンプル問題で100%カバー率のリアル試験問題（更新された297問あります)
今すぐダウンロード！リアルOracle 1Z0-819試験問題集テストエンジン試験問題
質問 # 75
Given:
Which is true about line 1?
- A. If the value is not present, a NullPointerException is thrown at run time.
- B. If the value is not present, a NoSuchElementException is thrown at run time.
- C. It always executes the System.out::print statement.
- D. If the value is not present, nothing is done.
正解：D
解説：
質問 # 76
Given the declaration:
In which two locations is it legal to apply the @Resource annotation?
- A. Loc4
- B. Loc3
- C. Loc2
- D. Loc2
- E. Loc1
正解：B、D
質問 # 77
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(priority=100)
- B. @Resource(name="Customer1", priority=100)
- C. @Resource(priority=0)
- D. @Resource(name="Customer1")
- E. @Resource
正解：A、C
質問 # 78
Given:
Assume the file on path does not exist. What is the result?
- A. The compilation fails.
- B. /u01/work/filestore.txt is deleted.
- C. Exception
- D. /u01/work/filestore.txt is not deleted.
正解：A
解説：
質問 # 79
Given:
What action ensures successful compilation?
- A. Replace int c; with private final int c;.
- B. Replace int c; with private int c;.
- C. Replace enum Color with public enum Color.
- D. Replace public Color(int c) with private Color(int c).
- E. Replace enum Color implements Serializable with public enum Color.
正解：D
解説：
質問 # 80
Given:
Which two changes need to be made to make this class compile? (Choose two.)
- A. Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {
- B. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;
- C. Change Line 1 to a class:public class API {
- D. Change Line 1 to an abstract class:public abstract class API {
- E. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;
正解：C、E
質問 # 81
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?
- A. Option C
- B. Option D
- C. Option B
- D. Option A
正解：A
質問 # 82
Which is true?
- A. The code compiles and runs successfully but with a wrong answer (i.e., a bug).
- B. Code compiles but throws a runtime exception when run.
- C. It prints 666.
- D. The code does not compile successfully.
正解：B
質問 # 83
Given:
What is the result?
- A. The compilation fails at line 8.
- B. The compilation fails at line 9.
- C. Hello World
- D. The compilation fails at line 2.
正解：C
解説：
質問 # 84
Given:
Which option should you choose to enable the code to print Something happened?
- A. Add extends Exception on line 1.
Add extends Exception on line 2. - B. Add extends GeneralException on line 1.
Add extends Exception on line 2. - C. Add extends Exception on line 1.
Add extends GeneralException on line 2. - D. Add extends SpecificException on line 1.
Add extends GeneralException on line 2.
正解：C
解説：
質問 # 85
Given:
What is the result?
- A. Joe Bloggs
- B. p1
- C. The compilation fails due to an error in line 1.
- D. null
正解：C
解説：
質問 # 86
Given:
Which two are correct? (Choose two.)
- A. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.
- B. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.
- C. The output will be exactly 2 1 3 4 5.
- D. The program prints 1 4 2 3, but the order is unpredictable.
- E. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
正解：D、E
解説：
質問 # 87
You replace the code on line 1 to use ParallelStream.
Which one is correct?
- A. The compilation fails.
- B. A NoSuchElementException is thrown at run time.
- C. The code may produce a different result.
- D. The code will produce the same result.
正解：C
質問 # 88
Assuming the Widget class has a getPrice method, this code does not compile:
Which two statements, independently, would allow this code to compile? (Choose two.)
- A. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).
- B. Replace line 1 with List<Widget> widgetStream = widgets.stream();.
- C. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.
- D. Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).
正解：A、C
質問 # 89 
And the code fragment:
Which situation will occur on code fragment execution?
- A. Starvation
- B. Deadlock
- C. Race Condition
- D. Livelock
正解：A
質問 # 90
Given:
What is known about the Sportscar class?
- A. The Sportscar class is a subclass of Automobile and inherits its methods.
- B. The Sportscar class inherits the setTurbo method from the superclass Automobile.
- C. The Sportscar subclass cannot override setTurbo method from the superclass Automobile.
- D. The Sportscar class is a superclass that has more functionality than the Automobile class.
正解：A
質問 # 91
Which line of code results in a compilation error?
- A. line n4
- B. line n2
- C. line n1
- D. line n3
正解：A
質問 # 92
Given the code fragment:
Path source = Paths.get("/repo/a/a.txt");
Path destination = Paths.get("/repo");
Files.move(source, destination); // line 1
Files.delete (source); // line 2
Assuming the source file and destination folder exist, what Is the result?
- A. a.txt is renamed repo.
- B. A java.nio.file.NoSuchFileException is thrown on line 2.
- C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
- D. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
正解：C
質問 # 93
Given:
It is required that if p instanceof Pairthen p.isValid()returns true.
Which is the smallest set of visibility changes to insure this requirement is met?
- A. setLeftand setRightmust be protected.
- B. left, right, setLeft, and setRightmust be private.
- C. leftand rightmust be private.
- D. isValidmust be public.
正解：D
質問 # 94
Given:
What is the result?
- A. Working
- B. Unknown
- C. WorkingUnknown
- D. The compilation fails.
- E. Tuesday
- F. TuesdayUnknown
正解：B
解説：
質問 # 95
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:
expected import java.lang - B. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist
- C. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class
- D. javac compiles Mycar.java without errors or warnings.
正解：D
質問 # 96
Given:
What is the result?
- A. The compilation fails due to an error in line 3.
- B. The compilation fails due to an error in line 5.
- C. The compilation fails due to an error in line 2.
- D. The compilation fails due to an error in line 4.
- E. 0
- F. 1
- G. The compilation fails due to an error in line 1.
正解：E
質問 # 97
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