Valid 1Z0-819 Exam Q&A PDF 1Z0-819 Dump is Ready (Updated 262 Questions)
Exam Questions and Answers for 1Z0-819 Study Guide
The Oracle 1Z0-819 exam covers a range of topics including Java fundamentals, object-oriented programming concepts, exceptions, concurrency, and collections, among others. It also tests candidates' ability to write code, debug and troubleshoot programs, and use various Java technologies and tools.
Oracle 1Z0-819 exam is a comprehensive and challenging certification exam that requires a significant amount of preparation and study. 1Z0-819 exam includes multiple choice and scenario-based questions and has a total of 80 questions that must be answered within a time limit of 180 minutes. To pass the exam, candidates must achieve a score of 63% or higher. Earning this certification can provide developers with valuable credentials and help them advance their careers, as it is recognized as a globally-recognized certification in the field of Java development.
Oracle 1z1-819 exam, also known as the Java SE 11 Developer exam, is designed to test the skills and knowledge of Java developers who work with the Java SE 11 platform. 1Z0-819 exam is intended for developers who are familiar with Java programming and are looking to advance their skills and knowledge in Java development. 1Z0-819 exam covers a wide range of topics, including Java language fundamentals, object-oriented programming principles, Java APIs, Java data types, Java collections, Java concurrency, and Java I/O.
NEW QUESTION # 145
Given:
Which one is correct?
- A. Four threads are created.
- B. An IllegalThreadStateException is thrown at run time.
- C. The compilation fails.
- D. Three threads are created.
Answer: B
Explanation:
NEW QUESTION # 146
Given:
What is the result?
- A. abcd
- B. adf
- C. abdf
- D. abd
- E. The compilation fails.
Answer: A
NEW QUESTION # 147
Given:
Taking into account that the order of the elements is unpredictable, what is the output?
- A. {mismatch=1, am=2, first=1, second=1}
- B. {am=2, first=1, mismatch=1, second=2}
- C. {mismatch=2, am=2, first=1, second=1}
- D. {l=mismatch, 2=am}
Answer: A
NEW QUESTION # 148
Given:
What is the result?
- A. this is it 2
- B. is it 1
- C. is it 0
- D. this is it 3
- E. An IndexOutOfBoundsException is thrown at runtime.
Answer: A
Explanation:
NEW QUESTION # 149
Given:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
- E. The compilation fails.
Answer: D
NEW QUESTION # 150
Given:
You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?
- A. Extend AutoCloseable and override the close method.
- B. Implement AutoCloseable and override the close method.
- C. Implement AutoCloseable and override the autoClose method.
- D. Extend AutoCloseable and override the autoClose method.
Answer: B
NEW QUESTION # 151
Given:
And the command:
java Main Helloworld
What is the result ?
- A. Input: Echo:
- B. Input: Helloworld Echo: Helloworld
- C. Input: Echo: Helloworld
- D. A NullPointerException is thrown at run time.
- E. Input: Then block until any input comes from System.in.
Answer: E
Explanation:
NEW QUESTION # 152
Which method throws an exception for not-a-number and infinite input values?
A)
B)
C)
D)
- A. Option A
- B. Option D
- C. Option C
- D. Option B
Answer: A
NEW QUESTION # 153
Given the code fragment:
What is the result?
- A. The program prints nothing.
- B. It prints 1 in the infinite loop.
- C. 0
- D. 1
- E. 01
Answer: A
NEW QUESTION # 154
Given:
What is the result?
- A. Keys: 0 Values: 0 Map: 0
- B. Keys: 4 Values: 4 Map: 4
- C. Keys: 4 Values: 4 Map: 0
- D. Keys: 0 Values: 0 Map:
- E. The compilation fails.
Answer: B
NEW QUESTION # 155
Given:
You want to calculate the average of the Player's score.
Which statement inserted on line 1 will accomplish this?
- A. players.stream().mapToDouble(a -> a.score).average();
- B. players.stream().map(a -> a.score).average();
- C. players.stream().average().orElse(0.0);
- D. players.stream().mapToInt(a -> a.score).average().orElse(0.0);
Answer: D
NEW QUESTION # 156
Given the code fragment:
What is the result?
- A. 0 8 10
- B. 0 4 9
- C. 0 8
- D. 0
- E. The code prints nothing.
Answer: C
Explanation:
NEW QUESTION # 157
Given:
and omitting the throws FooException clause results in a compilation error.
Which statement is true about FooException?
- A. FooException is unchecked.
- B. The body of foo can throw FooException or one of its subclasses.
- C. FooException is a subclass of RuntimeError.
- D. The body of foo can only throw FooException.
Answer: B
NEW QUESTION # 158
Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:
What security measures should be added to this method so that it meets the requirements for a customer accessible method?
- A. Make enableService private.
- B. Create a method that validates the hostName and portNumber parameters before opening the socket.
- C. Enclose the call to new Socket In an AccessController.doPrivileged block.
- D.
Answer: C
NEW QUESTION # 159
Given the code fragment:
You must make the countvariable thread safe.
Which two modifications meet your requirement? (Choose two.)
- A. replace line 1 with private AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();
- B. replace line 3 with
synchronized(test.count) {
test.count++;
} - C. replace line 1 with private volatile int count = 0;
- D. replace line 2 with public static synchronized void main(String[] args) {
- E. replace line 3 with
synchronized(test) {
test.count++;
}
Answer: A,B
Explanation:
Explanation/Reference: https://stackoverflow.com/questions/15852123/java-thread-safe-counter/15852164
NEW QUESTION # 160
Given:
and
Which two method definitions at line n1 in the Bar class compile? (Choose two.)
- A. public List<Integer> foo(Set<CharSequence> m) {...}
- B. public List<Number> foo(Set<String> m) {...}
- C. public List<Object> foo(Set<CharSequence> m) {...}
- D. public ArrayList<Integer> foo(Set<String> m) {...}
- E. public List<Integer> foo(TreeSet<String> m) {...}
- F. public ArrayList<Number> foo(Set<CharSequence> m) {...}
Answer: E,F
NEW QUESTION # 161
Given:
Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)
- A. public ArrayList<Integer> foo(Set<String> m) { ... }
- B. public List<Object> foo(Set<CharSequence> m) { ... }
- C. public List<Integer> foo(Set<String> m) { ... }
- D. public List<Integer> foo(TreeSet<String> m) { ... }
- E. public ArrayList<Number> foo(Set<CharSequence> m) { ... }
- F. public List<Integer> foo(Set<CharSequence> m) { ... }
Answer: D,E
NEW QUESTION # 162
Given:
What is the output?
- A. Message from Abstract Copier: Attempt00
- B. A compilation error is thrown.
- C. A runtime error is thrown.
- D. Message from Copier: Attempt00
Answer: B
NEW QUESTION # 163
Given the code fragment:
public void foo(Function<Integer, String> fun) {...}
Which two compile? (Choose two.)
- A. foo( Integer::toHexString )
- B. foo( int n -> Integer.toHexString(n) )
- C. foo( toHexString )
- D. foo( (int n) -> Integer.toHexString(n) )
- E. foo( n::toHexString )
- F. foo( n -> Integer::toHexString )
- G. foo( n -> Integer.toHexString(n) )
- H. foo( n -> n + 1 )
Answer: G,H
Explanation:
Explanation/Reference:
NEW QUESTION # 164
Given:
When is the readObject method called?
- A. The method is never called.
- B. before this object Is serialized
- C. after this object is deserialized
- D. after this object is serialized
- E. before this object is deserialized
Answer: C
NEW QUESTION # 165
Given:
Which line of code results in a compilation error?
- A. line n4
- B. line n1
- C. line n2
- D. line n3
Answer: A
Explanation:
NEW QUESTION # 166
Given:
What is the result?
- A. null
- B. An exception is thrown at runtime.
- C. Dr. Null
- D. Dr. Who
Answer: A
Explanation:
NEW QUESTION # 167
Given:
What is the result?
- A. this is it 2
- B. is it 1
- C. is it 0
- D. this is it 3
- E. An IndexOutOfBoundsException is thrown at runtime.
Answer: A
Explanation:
NEW QUESTION # 168
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 there is no zero args constructor defined in class X.
- B. The compilation fails because either class X or class Y needs to implement the toString() method.
- C. The compilation succeeds.
- D. The compilation fails because a final class cannot extend another class.
Answer: B
Explanation:
NEW QUESTION # 169
......
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