2023 Correct Practice Tests of 1Z0-819 Dumps with Practice Exam
Certification Sample Questions of 1Z0-819 Dumps With 100% Exam Passing Guarantee
NEW QUESTION # 129
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(v); }
- B. public String toString() { return String.valueOf(ALPHA.v); }
- C. String toString() { return "200"; }
- D. public String toString() { return String.valueOf(Letter.values()[1]); }
Answer: A
Explanation:
NEW QUESTION # 130
Assuming the Widget class has a getPrice method, this code does not compile:
Which two statements, independently, would allow this code to compile? (Choose two.)
- A. Replace line 1 with List<Widget> widgetStream = widgets.stream();.
- B. Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).
- C. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.
- D. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).
Answer: C,D
NEW QUESTION # 131
Given:
executed with this command:
java Main one two three
What is the output of this class?
- A. A java.lang.ArrayIndexOutOfBoundsException is thrown.
- B. nothing
- C. 1) one2) two3) three
- D. The compilation fails.
- E. 1) one
Answer: C
NEW QUESTION # 132
Given:
What is the result?
- A. 0 4 9
- B. 0
- C. 1
- D. nothing
Answer: D
NEW QUESTION # 133
Which code fragment prints 100 random numbers?
- A. Option C
- B. Option B
- C. Option D
- D. Option A
Answer: C
NEW QUESTION # 134
Which command line runs the main class com.acme.Main from the module com.example?
- A. java -classpath com.example.jar -m com.example/com.acme.Main
- B. java -classpath com.example.jar com.acme.Main
- C. java --module-path mods com.example/com.acme.Main
- D. java --module-path mods -m com.example/com.acme.Main
Answer: A
NEW QUESTION # 135
Given:
Why does D cause a compilation error?
- A. D inherits a() only from C.
- B. D extends more than one interface.
- C. D does not define any method.
- D. D inherits a() from B and C but the return types are incompatible.
Answer: D
NEW QUESTION # 136
Given:
executed with this command:
java Main one two three
What is the output of this class?
- A. A java.lang.ArrayIndexOutOfBoundsException is thrown.
- B. nothing
- C. 1) one2) two3) three
- D. The compilation fails.
- E. 1) one
Answer: C
NEW QUESTION # 137
Given:
What is the correct definition of the JsonField annotation that makes the Point class compile?
A)
B)
C)
- A. Option C
- B. Option B
- C. Option A
Answer: C
NEW QUESTION # 138
Assume ds is a DataSource and the EMP table is defined appropriately.
What does executing this code fragment do?
- A. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')
- B. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)
- C. inserts one row (101, 'SMITH', 'HR')
- D. throws a SQLException
Answer: C
NEW QUESTION # 139
Given:
Which statement is true about the Fox class?
- A. Fox class must implement either Forest or Town interfaces, but not both.
- B. Fox class must provide implementation for the inhabit method.
- C. Fox class does not have to override inhabit method, so long as it does not try to call it.
- D. The inhabit method implementation from the first interface that Fox implements will take precedence.
- E. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
Answer: E
NEW QUESTION # 140
Given this enum declaration:
Examine this code:
System.out.println(Alphabet.getFirstLetter());
What code should be written at line 3 to make this code print A?
- A. final String getFirstLetter() { return A.toString(); }
- B. static String getFirstLetter() { return A.toString(); }
- C. String getFirstLetter() { return A.toString(); }
- D. static String getFirstLetter() { return Alphabet.values()[1].toString(); }
Answer: B
NEW QUESTION # 141
Given:
Which two method implementations are correct, when inserted independently in line 1? (Choose two.)
- A. Option C
- B. Option E
- C. Option B
- D. Option A
- E. Option D
Answer: B,D
NEW QUESTION # 142
Which describes an aspect of Java that contributes to high performance?
- A. Java monitors and optimizes code that is frequently executed.
- B. Java automatically parallelizes code execution.
- C. Java prioritizes garbage collection.
- D. Java has a library of built-in functions that can be used to enable pipeline burst execution.
Answer: A
NEW QUESTION # 143
Given:
Which is true?
- A. The code throws an exception at runtime.
- B. The code compiles but does not print any result.
- C. The code does not compile.
- D. The code prints 25.
Answer: C
NEW QUESTION # 144
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1Z0-819 Sample Practice Exam Questions 2023 Updated Verified: https://examcompass.topexamcollection.com/1Z0-819-vce-collection.html
