2022年最新の保証された成功できる1z0-809問題集でOracleのPDF問題 [Q26-Q46]

2022年最新の保証された成功できる1z0-809問題集でOracleのPDF問題

格別な練習Java SE 8 Programmer II問題集で最速合格させます

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	Use The Built-In Interfaces Included In The Java.Util.Function Package Such As Predicate, Consumer, Function, And Supplier
トピック 2	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 3	Develop Code That Uses Stream Data Methods And Calculation Methods Iterate Using Foreach Methods Of Streams And List
トピック 4	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 5	Save Results To A Collection Using The Collect Method And Group Partition Data Using The Collectors Class
トピック 6	Work With Dates And Times Across Timezones And Manage Changes Resulting From Daylight Savings Including Format Date And Times Values
トピック 7	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 8	Search For Data By Using Search Methods Of The Stream Classes Including Findfirst, Findany, Anymatch, Allmatch, Nonematch
トピック 9	Create And Use Arraylist, Treeset, Treemap, And Arraydeque Objects Override Hashcode, Equals, And Tostring Methods From Object Class
トピック 10	Use Enumerated Types Including Methods, And Constructors In An Enum Type Implement Polymorphism Create And Use A Generic Class
トピック 11	Develop Code That Uses Binary Versions Of Functional Interfaces Use Autoclose Resources With A Try-With-Resources Statement
トピック 12	Develop Code That Uses The Unaryoperator Interface Create Custom Exceptions And Auto-Closeable Resources Lambda Built-In Functional Interfaces
トピック 13	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 14	Develop Code That Uses Primitive Versions Of Functional Interfaces Develop Code That Uses Abstract Classes And Methods
トピック 15	Develop Code To Extract Data From An Object Using Peek() And Map() Methods Including Primitive Versions Of The Map() Method

 

質問 26
Which statement is true about the DriverManager class?

• A. it executes SQL statements against the database.
• B. It returns an instance of Connection.
• C. It only queries metadata of the database.
• D. it is written by different vendors for their specific database.

正解: B

解説:
The DriverManager returns an instance of Doctrine\DBAL\Connection which is a wrapper around the underlying driver connection (which is often a PDO instance).
http://doctrine-dbal.readthedocs.org/en/latest/reference/configuration.html

 

質問 27
Which statement is true about java.util.stream.Stream?

• A. A parallel stream is always faster than an equivalent sequential stream.
• B. Streams are intended to modify the source data.
• C. A stream cannot be consumed more than once.
• D. The execution mode of streams can be changed during processing.

正解: D

 

質問 28
Given:
public class Foo<K, V> {
private K key;
private V value;
public Foo (K key, V value) (this.key = key; this value = value;)
public static <T> Foo<T, T> twice (T value) (return new Foo<T, T> (value, value); )
public K getKey () (return key;)
public V getValue () (return value;)
}
Which option fails?

• A. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100););
• B. Foo<?, ?> percentage = new Foo <> (97, 32););
• C. Foo<String, String> grade = new Foo <> ("John", "A");
• D. Foo<String, String> pair = Foo.<String>twice ("Hello World!");

正解: B

 

質問 29
Which class definition compiles?
A:

B:

C:

D:

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

正解: D

 

質問 30
Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?

• A. The expression expr3 must be present. It is evaluated after each iteration through the loop.
• B. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
• C. This is not the only valid for loop construct; there exits another form of for loop constructor.
• D. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.

正解: B,D

解説:
The for statement have this forms:
for (init-stmt; condition; next-stmt) {
body
}
There are three clauses in the for statement.
The init-stmt statement is done before the loop is started, usually to initialize an iteration
variable.
The condition expression is tested before each time the loop is done. The loop isn't
executed if the boolean expression is false (the same as the while loop).
The next-stmt statement is done after the body is executed. It typically increments an
iteration variable.

 

質問 31
Given that version.txtis accessible and contains:
1234567890
and given the code fragment:

What is the result?

• A. The program prints nothing.
• B. 0
• C. 1
• D. 2

正解: D

 

質問 32
Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction<Integer> inFu= x -> y -> x*y; //line n1
IntStream newStream = stream.map(inFu.apply(10)); //line n2
newStream.forEach(System.output::print);
Which modification enables the code fragment to compile?

• A. Replace line n2with:
  IntStream newStream = stream.map(inFu.applyAsInt (10));
• B. Replace line n1with:
  BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
• C. Replace line n1with:
  IntFunction<UnaryOperator> inFu = x -> y -> x*y;
• D. Replace line n1with:
  IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;

正解: A

 

質問 33
Which two code blocks correctly initialize a Locale variable?

• A. Locale loc3 = Locale.getLocaleFactory("RU");
• B. Locale loc1 = "UK";
• C. Locale loc5 = new Locale ("ru", "RU");
• D. Locale loc2 = Locale.getInstance("ru");
• E. Locale loc4 = Locale.UK;

正解: C,E

 

質問 34
Given the code fragment:
List<Integer> codes = Arrays.asList (10, 20);
UnaryOperator<Double> uo = s -> s +10.0;
codes.replaceAll(uo);
codes.forEach(c -> System.out.println(c));
What is the result?

• A. 20.0
  30.0
• B. A NumberFormatExceptionis thrown at run time.
• C. A compilation error occurs.
• D. 0

正解: A

 

質問 35
Given:
class UserException extends Exception { }
class AgeOutOfLimitException extends UserException { }
and the code fragment:
class App {
public void doRegister(String name, int age)
throws UserException, AgeOutOfLimitException {
if (name.length () < 6) {
throw new UserException ();
} else if (age >= 60) {
throw new AgeOutOfLimitException ();
} else {
System.out.println("User is registered.");
}
}
public static void main(String[ ] args) throws UserException {
App t = new App ();
t.doRegister("Mathew", 60);
}
}
What is the result?

• A. A UserException is thrown.
• B. An AgeOutOfLimitException is thrown.
• C. A compilation error occurs in the main method.
• D. User is registered.

正解: B

 

質問 36
Given:

and the code fragment:

What is the result?

• A. A compilation error occurs.
• B. 1500.0
• C. 0.0
• D. 2000.0

正解: B

 

質問 37
Given the code fragment:

Which is the valid definition of the Course enum?

• A.
• B.
• C.
• D.

正解: A

 

質問 38
Given:
class Vehicle implements Comparable<Vehicle>{
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + ":" + name;
}
public int compareTo(Vehicle o) {
return this.name.compareTo(o.name);
}
and this code fragment:
Set<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?

• A. [10124:BMW, 10123:Ford]
• B. A compilation error occurs.
• C. A ClassCastException is thrown at run time.
• D. [10123:Ford, 10124:BMW]

正解: D

 

質問 39
Given: What is the result?

• A. Third Exception
• B. First Exception Done
• C. 0 Done
• D. Second Exception
• E. Done Third Exception

正解: B

 

質問 40
Given:

What is the result?

• A. Compilation fails.
• B. Richard
  Donald
• C. An ArrayIndexOutOfBoundsException is thrown at runtime.
• D. A NullPointerException is thrown at runtime.
• E. null
  Richard
  Donald

正解: D

 

質問 41
Given the code fragment:

Assume that:
The required database driver is configured in the classpath. The appropriate database is accessible with the dbURL, userName, and passWord exists The Employee table has a column ID of type integer and the SQL query matches one record.
What is the result?

• A. Compilation fails at line 14.
• B. The code prints Error.
• C. The code prints the employee ID.
• D. Compilation fails at line 15.

正解: C

 

質問 42
Given:

and the code fragment:

What is the result?
true

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

正解: A

 

質問 43
Given:
public class Canvas implements Drawable {
public void draw () { }
}
public abstract class Board extends Canvas { }
public class Paper extends Canvas {
protected void draw (int color) { }
}
public class Frame extends Canvas implements Drawable {
public void resize () { }
abstract void open ();
}
public interface Drawable {
public abstract void draw ();
}
Which statement is true?

• A. Frame does not compile.
• B. All classes compile successfully.
• C. Paper does not compile.
• D. Drawable does not compile.
• E. Board does not compile.

正解: A

 

質問 44
Given the code fragment:
List<Integer> codes = Arrays.asList (10, 20);
UnaryOperator<Double> uo = s -> s +10.0;
codes.replaceAll(uo);
codes.forEach(c -> System.out.println(c));
What is the result?

• A. A NumberFormatExceptionis thrown at run time.
• B. 20.0
  30.0
• C. 10
  20
• D. A compilation error occurs.

正解: D

 

質問 45
Given the code fragment:
class CallerThread implements Callable<String> {
String str;
public CallerThread(String s) {this.str=s;}
public String call() throws Exception {
return str.concat("Call");
}
}
and
public static void main (String[] args) throws InterruptedException, ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(4); //line n1
Future f1 = es.submit (newCallerThread("Call"));
String str = f1.get().toString();
System.out.println(str);
}
Which statement is true?

• A. The program prints Call Call and does not terminate.
• B. The program prints Call Call and terminates.
• C. An ExecutionException is thrown at run time.
• D. A compilation error occurs at line n1.

正解: A

 

質問 46
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