Oct 22, 2023 Step by Step Guide to Prepare for 1z1-819 Exam BrainDumps
Oracle Java SE 1z1-819 Real Exam Questions and Answers FREE Updated on 2023
NEW QUESTION # 64
Which two safely validate inputs? (Choose two.)
- A. Assume inputs have already been validated.
- B. Use trusted domain-specific libraries to validate inputs.
- C. Accept only valid characters and input values.
- D. Modify the input values, as needed, to pass validation.
- E. Delegate numeric range checking of values to the database.
Answer: C,E
Explanation:
Reference:
/validating-input-using-java-util-scanner
NEW QUESTION # 65
Your organization provides a cloud server to your customer to run their Java code. You are reviewing the changes for the next release and you see this change in one of the config files:
Which is correct?
- A. You reject the change because -Xms8g -Xmx8g uses too much system memory.
- B. You accept the change because -noverify is a standard option that has been supported since Java 1.0.
- C. You reject the change because -noverify is a critical security risk.
- D. You accept the change because -noverify is necessary for your code to run with the latest version of Java.
Answer: C
NEW QUESTION # 66
Given:
What is the output?
- A. 0
- B. Exception
- C. 1
- D. 2
Answer: C
Explanation:
NEW QUESTION # 67
Given:
What is the output?
- A. 0
- B. Exception
- C. 1
- D. 2
Answer: C
Explanation:
NEW QUESTION # 68
Given the code fragment:
What is the result?
EUR -> 0.84
- A. GBP -> 0.75
EUR -> 0.84
CNY -> 6.42 - B. EUR -> 0.84
GBP -> 0.75
USD -> 1.00
USD -> 1.00 - C. The compilation fails.
CNY -> 6.42 - D. GBP -> 0.75
USD -> 1.00
CNY -> 6.42
Answer: C
Explanation:
NEW QUESTION # 69
Given:
Which two are correct? (Choose two.)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: A,B
NEW QUESTION # 70
Given:
Which two are secure serialization of these objects? (Choose two.)
- A. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
- B. Define the serialPersistentFields array field.
- C. Make the class abstract.
- D. Declare fields transient.
- E. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
Answer: A,B
NEW QUESTION # 71
var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)
- A. double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();
- B. double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));
- C. double avg = numbers.stream().average().getAsDouble();
- D. double avg = numbers.stream().mapToInt (i > i).average().parallel();
- E. double avg = numbers.stream().parallel().averagingDouble(a > a);
Answer: A,C
Explanation:
NEW QUESTION # 72
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 SpecificException on line 1.
Add extends GeneralException on line 2. - D. Add extends Exception on line 1.
Add extends GeneralException on line 2.
Answer: D
Explanation:
NEW QUESTION # 73
Given:
Which is true?
- A. The code compiles but does not print any result.
- B. The code does not compile.
- C. The code prints 25.
- D. The code throws an exception at runtime.
Answer: B
NEW QUESTION # 74
Given:
What is the result?
- A. The compilation fails due to an error in line 1.
- B. The compilation fails due to an error in line 3.
- C. The compilation fails due to an error in line 4.
- D. 0
- E. The compilation fails due to an error in line 5.
- F. 1
- G. The compilation fails due to an error in line 2.
Answer: F
NEW QUESTION # 75
Given:
executed using command:
java Hello "Hello World" Hello World
What is the output?
- A. Hello WorldHelloWorld
- B. HelloHello WorldHelloWorld
- C. An exception is thrown at runtime.
- D. Hello WorldHello World
- E. Hello World Hello World
Answer: E
NEW QUESTION # 76
Given:
What must be added in line 1 to compile this class?
- A. catch(FileNotFoundException | IndexOutOfBoundsException e) { }
- B. catch(FileNotFoundException e) { }catch(IndexOutOfBoundsException e) { }
- C. catch(IndexOutOfBoundsException e) { }catch(FileNotFoundException e) { }
- D. catch(IOException e) { }
- E. catch(FileNotFoundException | IOException e) { }
Answer: D
NEW QUESTION # 77
Given:
What is the result?
- A. compilation error
- B. 6 13
- C. 0 5
- D. 5 12
Answer: A
Explanation:
NEW QUESTION # 78
Given:
What is the result?
- A. An exception is thrown at runtime.
- B. 0
- C. 1
- D. 2
Answer: D
Explanation:
NEW QUESTION # 79
Given:
Assuming that this code compiles correctly, which three statements are true? (Choose three.)
- A. B cannot be final.
- B. A is a subtype of B.
- C. A cannot be abstract.
- D. A cannot be final.
- E. B is a subtype of A.
- F. B cannot be abstract.
Answer: D,E,F
NEW QUESTION # 80
Given the code fragment:
What is the result?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: B
NEW QUESTION # 81
Given:
Which two constructors will compile and set the class field strings? (Choose two.)
- A. Option D
- B. Option C
- C. Option A
- D. Option E
- E. Option B
Answer: B,D
NEW QUESTION # 82
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 java.nio.file.NoSuchFileException is thrown on line 2.
- B. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
- C. a.txt is renamed repo.
- D. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
Answer: D
NEW QUESTION # 83
Given the code fragment:
What is the result?
- A. A java.lang, UnsupportedOperationException is thrown.
- B. True
- C. False
- D. A java.lang.NullPointerException is thrown.
Answer: A
NEW QUESTION # 84
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