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Oracle 1Z0-819 Free Practice Questions
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Free demo questions for Oracle 1Z0-819 Exam Dumps Below:
NEW QUESTION 1
Given:
and:
Which code, when inserted on line 10, prints the number of unique localities from the roster list?
- A. .map(Employee::getLocality).distinct().count();
- B. map(e > e.getLocality()).count();
- C. .map(e > e.getLocality()).collect(Collectors.toSet()).count();
- D. .filter(Employee::getLocality).distinct().count();
Answer: D
NEW QUESTION 2
Given:
Which is true about line 1?
- A. If the value is not present, a NoSuchElementException is thrown at run time.
- B. It always executes the System.out::print statement.
- C. If the value is not present, a NullPointerException is thrown at run time.
- D. If the value is not present, nothing is done.
Answer: D
Explanation:
NEW QUESTION 3
Given:
Which would cause s to be AQCD?
- A. s.replace(s.indexOf(“A”), s.indexOf(“C”), “Q”);
- B. s.replace(s.indexOf(“B”), s.indexOf(“C”), “Q”);
- C. s.replace(s.indexOf(“B”), s.indexOf(“B”), “Q”);
- D. s.replace(s.indexOf(“A”), s.indexOf(“B”), “Q”);
Answer: B
NEW QUESTION 4
Which two statements are true about Java modules? (Choose two.)
- A. Modular jars loaded from --module-path are automatic modules.
- B. Any named module can directly access all classes in an automatic module.
- C. Classes found in –classpath are part of an unnamed module.
- D. Modular jars loaded from –classpath are automatic modules.
- E. If a package is defined in both the named module and the unnamed module, then the package in the unnamed module is ignored.
Answer: AC
NEW QUESTION 5
Analyze the code:
Which two options can you insert inside println method to produce Global:namescope? (Choose two.)
- A. Test.prefix+Test.name
- B. new Test().prefix+new Test().name
- C. Test.prefix+Test.getName()
- D. Test.getName+prefix
- E. prefix+Test.name
- F. prefix+name
Answer: BC
NEW QUESTION 6
Given:
Which two allow a.Main to allocate a new Person? (Choose two.)
- A. In Line 1, change the access modifier to privateprivate Person() {
- B. In Line 1, change the access modifier to publicpublic Person() {
- C. In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
- D. In Line 2, change the access modifier to protectedprotected class Main {
- E. In Line 1, remove the access modifierPerson() {
Answer: BC
NEW QUESTION 7
Given:
What is the output?
- A. null
- B. A NoSuchElementException is thrown at run time.
- C. Duke
- D. A NullPointerException is thrown at run time.
Answer: C
Explanation:
NEW QUESTION 8
Given the code fragment:
What is the result?
- A. ab cd ef
- B. An ArrayIndexOutOfBoundsException is thrown at runtime.
- C. The compilation fails.
- D. abc def
- E. ad be cf
Answer: E
NEW QUESTION 9
Given:
What is the result?
- A. WorkingUnknown
- B. Unknown
- C. TuesdayUnknown
- D. The compilation fails.
- E. Tuesday
- F. Working
Answer: B
Explanation:
NEW QUESTION 10
Given:
Which is true?
- A. The code compiles but does not print any result.
- B. The code prints 25.
- C. The code does not compile.
- D. The code throws an exception at runtime.
Answer: C
NEW QUESTION 11
Given the code fragment:
What is the result?
- A. 01
- B. 1
- C. The program prints nothing.
- D. It prints 1 in the infinite loop.
Answer: D
NEW QUESTION 12
Given:
var data = new ArrayList<>(); data.add(“Peter”);
data.add(30); data.add(“Market Road”); data.set(1, 25); data.remove(2); data.set(3, 1000L); System.out.print(data); What is the output?
- A. [Market Road, 1000]
- B. [Peter, 30, Market Road]
- C. [Peter, 25, null, 1000]
- D. An exception is thrown at run time.
Answer: D
Explanation:
NEW QUESTION 13
Given:
What is the result?
- A. 3 5 3 3
- B. 3 3 3 3
- C. 3 5 3 5
- D. 5 5 3 3
Answer: A
Explanation:
NEW QUESTION 14
Given:
What is the type of x?
- A. char
- B. List
- C. String
- D. List
Answer: C
NEW QUESTION 15
Which two describe reasons to modularize the JDK? (Choose two.)
- A. easier to understand the Java language
- B. improves security and maintainability
- C. easier to expose implementation details
- D. improves application robustness
- E. easier to build a custom runtime linking application modules and JDK modules
Answer: BD
NEW QUESTION 16
Given:
What is the result?
- A. A ClassCastException is thrown at runtime.
- B. AnotherClass#methodA()AnotherClass#methodA()
- C. The compilation fails.
- D. SomeClass#methodA()AnotherClass#methodA()
- E. AnotherClass#methodA()SomeClass#methodA()
- F. SomeClass#methodA()SomeClass#methodA()
Answer: C
Explanation:
NEW QUESTION 17
Given:
and checkQuality(QUALITY.A); and
Which code fragment can be inserted into the switch statement to print Best?
- A. QUALITY.A.ValueOf()
- B. A
- C. A.toString()
- D. QUALITY.A
Answer: B
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