PDF問題（2022年最新）実際のOracle 1z0-809試験問題 [Q86-Q102]

PDF問題（2022年最新）実際のOracle 1z0-809試験問題

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Oracle 1z0-809 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Develop Code That Declares, Implements And Or Extends Interfaces And Use The @Override Annotation Develop Code That Uses The Optional Class
トピック 2	Develop Code That Uses Primitive Versions Of Functional Interfaces Develop Code That Uses Abstract Classes And Methods
トピック 3	Use Catch, Multi-Catch, And Finally Clauses Use Flatmap() Methods In The Stream API Develop Code That Uses The Final Keyword
トピック 4	Work With Dates And Times Across Timezones And Manage Changes Resulting From Daylight Savings Including Format Date And Times Values
トピック 5	Describe Stream Interface And Stream Pipeline Create Inner Classes Including Static Inner Class, Local Class, Nested Class, And Anonymous Inner Class
トピック 6	Develop Code That Uses The Unaryoperator Interface Create Custom Exceptions And Auto-Closeable Resources Lambda Built-In Functional Interfaces
トピック 7	Create And Use Singleton Classes And Immutable Classes Use Java.Util.Comparator And Java.Lang.Comparable Interfaces
トピック 8	Develop Code To Extract Data From An Object Using Peek() And Map() Methods Including Primitive Versions Of The Map() Method
トピック 9	Search For Data By Using Search Methods Of The Stream Classes Including Findfirst, Findany, Anymatch, Allmatch, Nonematch
トピック 10	Use The Built-In Interfaces Included In The Java.Util.Function Package Such As Predicate, Consumer, Function, And Supplier
トピック 11	Implement Inheritance Including Visibility Modifiers And Composition Use Method References With Streams
トピック 12	Use Enumerated Types Including Methods, And Constructors In An Enum Type Implement Polymorphism Create And Use A Generic Class
トピック 13	Develop Code That Uses Static Keyword On Initialize Blocks, Variables, Methods, And Classes
トピック 14	Create And Use Arraylist, Treeset, Treemap, And Arraydeque Objects Override Hashcode, Equals, And Tostring Methods From Object Class
トピック 15	Save Results To A Collection Using The Collect Method And Group Partition Data Using The Collectors Class
トピック 16	Define And Create And Manage Date-Based And Time-Based Events Using Instant, Period, Duration, And Temporalunit Filter A Collection By Using Lambda Expressions
トピック 17	Create And Manage Date-Based And Time-Based Events Including A Combination Of Date And Time Into A Single Object Using Localdate, Localtime, Localdatetime
トピック 18	Develop Code That Uses Stream Data Methods And Calculation Methods Iterate Using Foreach Methods Of Streams And List

質問 86
Which two class definitions fail to compile?

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

正解: B,C

質問 87
Given:

What is the result?

A. Compilation fails
B. An exception is thrown at runtime
C. 0
D. Null

正解: B

質問 88
Given that these files exist and are accessible:

and given the code fragment:

Which code fragment can be inserted at line n1to enable the code to print only /company/emp?
Stream<Path> stream = Files.list (Paths.get ("/company"));

A. Stream<Path> stream = Files.walk (Paths.get ("/company"));
B. Paths.get ("/company"), 1,
(p,b) -> b.isDirectory (), FileVisitOption.FOLLOW_LINKS);
C. Stream<Path> stream = Files.find(
D. Stream<Path> stream = Files.list (Paths.get ("/company/emp"));

正解: B

質問 89
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + ":" + name + ":" + city;
}
public String getCourse() {return course;}
public String getName() {return name;}
public String getCity() {return city;}
and the code fragment:
List<Student> stds = Arrays.asList(
new Student ("Jessy", "Java ME", "Chicago"),
new Student ("Helen", "Java EE", "Houston"),
new Student ("Mark", "Java ME", "Chicago"));
stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.forEach(src, res) -> System.out.println(scr));
What is the result?

A. A compilation error occurs.
B. [Java EE: Helen:Houston][Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
C. Java EEJava ME
D. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago][Java EE: Helen:Houston]

正解: C

質問 90
Given the code fragment:
BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2; //line n1 System.out.println(val.apply(10, 10.5));
What is the result?

A. 0
B. A compilation error occurs at line n2.
C. A compilation error occurs at line n1.
D. 20.5

正解: C

質問 91
Assume customers.txtis accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txtfile?
Stream<String> stream = Files.find (Paths.get ("customers.txt"));

A. stream.forEach( c) -> System.out.println(c));
Stream<String> lines = Files.lines (Paths.get ("customers.txt"));
B. lines.forEach( c) -> System.out.println(c));
C. stream.forEach((String c) -> System.out.println(c));
Stream<Path> stream = Files.find (Paths.get ("customers.txt"));
D. stream.forEach( c) -> System.out.println(c));
Stream<Path> stream = Files.list (Paths.get ("customers.txt"));

正解: B

質問 92
Which statement is true about the single abstract method of the java.util.function.Predicate interface?

A. It accepts one argument and returns boolean.
B. It accepts an argument and produces a result of any data type.
C. It accepts one argument and always produces a result of the same type as the argument.
D. It accepts one argument and returns void.

正解: A

解説:
Explanation
References:

質問 93
Given:
Item table
* ID, INTEGER: PK
* DESCRIP, VARCHAR(100)
* PRICE, REAL
* QUANTITY< INTEGER
And given the code fragment:
9 . try {
1 0. Connection conn = DriveManager.getConnection(dbURL, username, password);
1 1. String query = "Select * FROM Item WHERE ID = 110";
1 2. Statement stmt = conn.createStatement();
1 3. ResultSet rs = stmt.executeQuery(query);
1 4. while(rs.next()) {
1 5. System.out.println("ID: " + rs.getInt("Id"));
1 6. System.out.println("Description: " + rs.getString("Descrip"));
1 7. System.out.println("Price: " + rs.getDouble("Price"));
1 8. System.out.println(Quantity: " + rs.getInt("Quantity"));
1 9. }
2 0. } catch (SQLException se) {
2 1. System.out.println("Error");
2 2. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWordexists.
The SQL query is valid.
What is the result?

A. The code prints information about Item 110.
B. Compilation fails.
C. The code prints Error.
D. An exception is thrown at runtime.

正解: C

質問 94
Given the code fragment:
Stream<Path> files = Files.walk(Paths.get(System.getProperty(“user.home”))); files.forEach (fName -> { //line n1 try { Path aPath = fName.toAbsolutePath(); //line n2 System.out.println(fName + “:”
+ Files.readAttributes(aPath,
Basic.File.Attributes.class).creationTime
());
} catch (IOException ex) {
ex.printStackTrace();
});
What is the result?

A. A compilation error occurs at line n2.
B. All files and directories under the home directory are listed along with their attributes.
C. The files in the home directory are listed along with their attributes.
D. A compilation error occurs at line n1.

正解: B

質問 95
In 2015, daylight saving time in New York, USA, begins on March 8th at 2:00 AM. As a result, 2:00 AM becomes 3:00 AM.
Given the code fragment:

Which is the result?

A. 4:00 – difference: 2
B. 2:00 – difference: 1
C. 3:00 – difference: 2
D. 4:00 – difference: 3

正解: B

質問 96
Given the code fragment:

What is the result?

A. 4 : 4 : 4
B. 6 : 5 : 6
C. 5 : 3 : 6
D. 3 : 3 : 4

正解: C

質問 97
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println("Walking");)
public void run(Integer distance);
}
Which statement is true?

A. Movable cannot be used in a lambda expression.
B. Moveable can be used as below:
Moveable<Integer> animal = n - > System.out.println("Running" + n);
animal.run(100);
animal.walk(20);
C. Moveable can be used as below:
Moveable<Integer> animal = n - > n + 10;
animal.run(100);
animal.walk(20);
D. Moveable can be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20);

正解: C

質問 98
Which two statements are true about localizing an application?

A. Support for new regional languages does not require recompilation of the code.
B. Language and region-specific programs are created using localized data.
C. Resource bundle files include data and currency information.
D. Textual elements (messages and GUI labels) are hard-coded in the code.
E. Language codes use lowercase letters and region codes use uppercase letters.

正解: A,E

解説:
Reference: http://docs.oracle.com/javase/7/docs/technotes/guides/intl/

質問 99
Given:
public class Counter {
public static void main (String[ ] args) {
int a = 10;
int b = -1;
assert (b >=1) : "Invalid Denominator";
int = a / b;
System.out.println (c);
}
}
What is the result of running the code with the -da option?