[Jan 21, 2022] New Updated 1z1-819 Exam Questions 2022
Updated Free Oracle 1z1-819 Test Engine Questions with 215 Q&As
NEW QUESTION 114
Given:
Which two are correct? (Choose two.)
- A. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.
- B. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
- C. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.
- D. The output will be exactly 2 1 3 4 5.
- E. The program prints 1 4 2 3, but the order is unpredictable.
Answer: B,E
Explanation:
NEW QUESTION 115
Given:
Which loop incurs a compile time error?
- A. the loop starting line 14
- B. the loop starting line 11
- C. the loop starting line 3
- D. the loop starting line 7
Answer: A
NEW QUESTION 116
Given:
What must be added in line 1 to compile this class?
- A. catch(FileNotFoundException | IndexOutOfBoundsException e) { }
- B. catch(IndexOutOfBoundsException e) { }catch(FileNotFoundException e) { }
- C. catch(FileNotFoundException e) { }catch(IndexOutOfBoundsException e) { }
- D. catch(FileNotFoundException | IOException e) { }
- E. catch(IOException e) { }
Answer: E
NEW QUESTION 117
Given:
What prevents this code from compiling?
- A. The calculateSurfaceAreamethod within Cylinder must be declared default.
- B. Cylinderis not properly calling the Rectangle and Ellipseinterfaces' calculateSurfaceArea methods.
- C. Cylinderrequires an implementation of calculateSurfaceAreawith two parameters.
- D. The calculateSurfaceAreamethod within Rectangle and Ellipserequires a publicaccess modifier.
Answer: B
NEW QUESTION 118
Which is a proper JDBC URL?
- A. http://localhost mysql.jdbc:3306/database
- B. http://localhost.mysql.com:3306/database
- C. jdbe.mysql.com://localhost:3306/database
- D. jdbc:mysql://localhost:3306/database
Answer: D
NEW QUESTION 119
Which two statements independently compile? (Choose two.)
- A. List<? super Number> list = new ArrayList<Integer>();
- B. List<? super Short> list = new ArrayList<Number>();
- C. List<? extends Number> list = new ArrayList<Object>();
- D. List<? extends Number> list = new ArrayList<Byte>();
- E. List<? super Float> list = new ArrayList<Double>();
Answer: B,D
Explanation:
NEW QUESTION 120
Given:
Which two methods modify field values? (Choose two.)
- A. setTCount
- B. setAllCounts
- C. setCCount
- D. setACount
- E. setGCount
Answer: B,E
NEW QUESTION 121
Given:
And the command:
java Main Helloworld
What is the result ?
- A. Input:
Echo: Helloworld - B. Input: Helloworld Echo: Helloworld
- C. A NullPointerException is thrown at run time.
- D. Input: Echo:
- E. Input:
Then block until any input comes from System.in.
Answer: E
Explanation:
NEW QUESTION 122
Given an application with a main module that has this module-info.java file:
Which two are true? (Choose two.)
- A. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
- B. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
- C. An implementation of country.countryDetails can be added to the main module.
- D. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
- E. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.
Answer: A,B
Explanation:
Reference:
/java-9-error-not-in-a-module-on-the-module-source- path
NEW QUESTION 123
Given the code fragment:
Path currentFile = Paths.get("/scratch/exam/temp.txt");
Path outputFile = Paths get("/scratch/exam/new.txt");
Path directory = Paths.get("/scratch/");
Files.copy(currentFile, outputFile);
Files.copy(outputFile, directory);
Files.delete (outputFile);
The /scratch/exam/temp.txt file exists. The /scratch/exam/new.txt and /scratch/new.txt files do not exist.
What is the result?
- A. /scratch/exam/new.txt and /scratch/new.txt are deleted.
- B. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.
- C. The program throws a NoSuchFileException.
- D. The program throws a FileaAlreadyExistsException.
Answer: C
Explanation:
NEW QUESTION 124
Given:
If file "App.config" is not found, what is the result?
- A. Exception in thread "main" java.lang.Error:Fatal Error: Configuration File, App.config, is missing.
- B. The compilation fails.
- C. nothing
- D. Configuration is OK
Answer: B
Explanation:
NEW QUESTION 125
Given the code fragment:
You must make the countvariable thread safe.
Which two modifications meet your requirement? (Choose two.)
- A. replace line 2 with public static synchronized void main(String[] args) {
- B. replace line 3 with
synchronized(test.count) {
test.count++;
} - C. replace line 1 with private volatile int count = 0;
- D. replace line 3 with
synchronized(test) {
test.count++;
} - E. replace line 1 with private AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();
Answer: B,E
Explanation:
Explanation/Reference: https://stackoverflow.com/questions/15852123/java-thread-safe-counter/15852164
NEW QUESTION 126
Given this enum declaration:
Examine this code:
System.out.println(Letter.values()[1]);
What code should be written at line 5 for this code to print 200?
- A. public String toString() { return String.valueOf(Letter.values()[1]); }
- B. String toString() { return "200"; }
- C. public String toString() { return String.valueOf(ALPHA.v); }
- D. public String toString() { return String.valueOf(v); }
Answer: D
Explanation:
NEW QUESTION 127
Given the code fragment:
What is the result?
- A. True
- B. False
- C. A java.lang, UnsupportedOperationException is thrown.
- D. A java.lang.NullPointerException is thrown.
Answer: C
NEW QUESTION 128
Given an application with a main module that has this module-info.java file:
Which two are true? (Choose two.)
- A. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
- B. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
- C. An implementation of country.countryDetails can be added to the main module.
- D. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
- E. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.
Answer: A,B
NEW QUESTION 129
Which declaration of an annotation type is legal?
@interface Author {
- A. String name() default "";
String date();
}
@interface Author { - B. String name();
String date default "";
} - C. String name() default null;
String date();
}
@interface Author { - D. String name();
String date;
}
@interface Author { - E. String name() default "";
String date();
}
@interface Author extends Serializable {
Answer: E
NEW QUESTION 130
Given:
What is the result?
- A. The compilation fails at line 2.
- B. Hello World
- C. The compilation fails at line 8.
- D. The compilation fails at line 9.
Answer: B
Explanation:
NEW QUESTION 131
Given:
What is the result?
- A. appleorangegrapelemonapricotwatermelon
- B. appleapricotgrapelemonorangewatermelon
- C. watermelonorangelemongrapeapricotapple
- D. nothing
Answer: C
Explanation:
NEW QUESTION 132
Examine these module declarations:
Which two statements are correct? (Choose two.)
- A. The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the com.example.api API.
- B. The ServiceProvider module should export the com.myimpl package.
- C. The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install multiple provider modules.
- D. The Consumer module should require the ServiceProvider module.
- E. The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.
Answer: D,E
NEW QUESTION 133
Given:
It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?
- A. setLeft and setRight must be protected.
- B. left and right must be private.
- C. left, right, setLeft, and setRight must be private.
- D. isValid must be public.
Answer: B
NEW QUESTION 134
Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?
- A. The compilation fails because either class X or class Y needs to implement the toString() method.
- B. The compilation fails because there is no zero args constructor defined in class X.
- C. The compilation succeeds.
- D. The compilation fails because a final class cannot extend another class.
Answer: A
Explanation:
NEW QUESTION 135
Which describes a characteristic of setting up the Java development environment?
- A. The Java development environment is set up for all operating systems by default.
- B. You set up the Java development environment for a specific operating system when you install the JDK.
- C. Setting up the Java development environment requires that you also install the JRE.
- D. Setting up the Java development environment occurs when you install an IDE before the JDK.
Answer: D
NEW QUESTION 136
Given:
Which statement on line 1 enables this code to compile?
- A. Function<int> f = n > n * 2;
- B. Function<Integer> f = n > n * 2;
- C. Function<int, int> f = n > n * 2;
- D. Function f = n > n * 2;
- E. Function<Integer, Integer> f = n > n * 2;
Answer: E
Explanation:
NEW QUESTION 137
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