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Oracle 1z1-819 certification exam is an excellent way for Java developers to demonstrate their proficiency in Java SE 11 development and advance their careers. By preparing thoroughly for the exam and earning the certification, professionals can gain a competitive edge in the job market and access a range of valuable resources and benefits.
NEW QUESTION # 140
Which three initialization statements are correct? (Choose three.)
- A. int x = 12_34;
- B. byte b = 10;char c = b;
- C. int[][] e = {{1,1},{2,2}};
- D. String contact# = "(+2) (999) (232)";
- E. short sh = (short)'A';
- F. float x = 1.99;
- G. boolean true = (4 == 4);
Answer: A,C,E
NEW QUESTION # 141
Given:
Which three are correct? (Choose three.)
- A. b1.foo(li) prints Bonjour le monde!
- B. b1.foo(li) prints Hola Mundo!
- C. f2.foo(li) prints Hola Mundo!
- D. f1.foo(li) prints Bonjour le monde!
- E. f2.foo(li) prints Hello world!
- F. f1.foo(li) prints Hola Mundo!
- G. f1.foo(li) prints Hello world!
- H. b1.foo(li) prints Hello world!
- I. f2.foo(li) prints Bonjour le monde!
Answer: B,D,H
NEW QUESTION # 142
Given the code fragment:
Which statement at line 1 will print Ping Pong?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION # 143
Given:
executed using this command:
java Myclass My Car is red
What is the output of this class?
- A. My--Car--is
- B. Myclass--Car--red
- C. java--Myclass--My
- D. Car--red--My
- E. My--is--java
Answer: D
NEW QUESTION # 144
Given:
You want to examine the items list it contains an item for which the variable count is below zero.
Which code fragment at line 1 accomplish this?
- A. If (items.stream () .allmatch (i -> count < 0) < 0) ) {
- B. If (items.stream () .filter (i -> count < 0) . findAny () ) {
- C. If (items.stream () .anymatch (i -> count < 0) < 0) ) {
- D. If (items.stream () .filter (i -> count < 0) . findFirst () ) {
Answer: D
NEW QUESTION # 145
Given:
What must be added in line 1 to compile this class?
- A. catch(IOException e) { }
- B. catch(FileNotFoundException | IndexOutOfBoundsException e) { }
- C. catch(FileNotFoundException e) { }catch(IndexOutOfBoundsException e) { }
- D. catch(IndexOutOfBoundsException e) { }catch(FileNotFoundException e) { }
- E. catch(FileNotFoundException | IOException e) { }
Answer: A
NEW QUESTION # 146
Given:
What is the result?
- A. NullPointerException is thrown at line 4.
- B. NullPointerException is thrown at line 10.
- C. Hello
- D. A compilation error occurs.
Answer: C
Explanation:
NEW QUESTION # 147
Given:
What is true?
- A. This should print the same result each time the program runs.
- B. This may not print the same result each time the program runs.
- C. The compilation fails.
- D. A NoSuchElementExceptionis thrown at run time.
Answer: B
Explanation:
NEW QUESTION # 148
Consider this method declaration:
A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?
- A. A, because it is unnecessary to enclose identifiers in quotes.
- B. A, because it sends exactly the value of user provided by the calling code.
- C. B, because all values provided by the calling code should be enquoted.
- D. A and B are functionally equivalent.
- E. B, because enquoting values provided by the calling code prevents SQL injection.
Answer: B
NEW QUESTION # 149
Given:
What is the result?
- A. Good Night, Potter
- B. Good Night, Harry
- C. Good Morning, Potter
- D. Good Morning, Harry
Answer: A
Explanation:
NEW QUESTION # 150
Given the code fragment:
How many lines of text does this program print?
- A. three
- B. one
- C. four
- D. two
Answer: D
NEW QUESTION # 151
Given these two classes:
And given this fragment:
Which describes the fragment?
- A. It is subject to deadlock.
- B. It is subject to livelock.
- C. It throws IllegalMonitorStateException.
- D. The code does not compile.
Answer: D
NEW QUESTION # 152
Given the code fragment:
Which "for" loop produces the same output?
- A. Option B
- B. Option C
- C. Option D
- D. Option A
Answer: B
NEW QUESTION # 153
Which two interfaces are considered to be functional interfaces? (Choose two.)
@FunctionalInterface
- A. interface InterfaceE {
public boolean equals(int i);
int breed(int x);
}
interface InterfaceA { - B. int GERM = 13;
public default int getGERM() { return GERM; }
}
interface InterfaceB { - C. interface InterfaceD {
int breed(int x);
}
@FunctionalInterface - D. interface InterfaceC {
public boolean equals(Object o);
int breed(int x);
int calculate(int x, int y);
}
@FunctionalInterface - E. int GERM = 13;
public default int getGERM() { return get(); }
private int get() { return GERM; }
public boolean equals(Object o);
int breed(int x);
}
Answer: A,D
Explanation:
Explanation/Reference:
NEW QUESTION # 154
Given:
After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?
- A. after line 5
- B. after line 6
- C. after line 8
- D. after line 10
Answer: B
Explanation:
NEW QUESTION # 155
Analyze the code:
Which two options can you insert inside println method to produce Global:namescope? (Choose two.)
- A. Test.prefix+Test.getName()
- B. prefix+name
- C. Test.prefix+Test.name
- D. prefix+Test.name
- E. new Test().prefix+new Test().name
- F. Test.getName+prefix
Answer: A,E
NEW QUESTION # 156
Given:
/code/a/Test.java
containing:
and
/code/b/Best.java
containing:
package b;
public class Best { }
Which is the valid way to generate bytecode for all classes?
- A. javac -d /code /code/a/Test.java /code/b/Best.java
- B. java /code/a/Test.java /code/b/Best.java
- C. java /code/a/Test.java
- D. java -cp /code a.Test
- E. javac -d /code /code/a/Test
- F. javac -d /code /code/a/Test.java
Answer: A
NEW QUESTION # 157
Given:
and omitting the throws FooException clause results in a compilation error.
Which statement is true about FooException?
- A. The body of foo can only throw FooException.
- B. The body of foo can throw FooException or one of its subclasses.
- C. FooException is a subclass of RuntimeError.
- D. FooException is unchecked.
Answer: B
NEW QUESTION # 158
Which set of commands is necessary to create and run a custom runtime image from Java source files?
- A. jar, jlink
- B. javac, jar
- C. javac, jlink
- D. java, jdeps
Answer: C
NEW QUESTION # 159
Analyze the code:
Which two options can you insert inside println method to produce Global:namescope? (Choose two.)
- A. Test.prefix+Test.getName()
- B. prefix+name
- C. Test.prefix+Test.name
- D. prefix+Test.name
- E. new Test().prefix+new Test().name
- F. Test.getName+prefix
Answer: A,E
NEW QUESTION # 160
Given:
What is the output?
- A. Bonjour le monde!Bonjour le monde!
- B. Hello world!Hello world!
- C. Hello world!Bonjour le monde!
- D. Bonjour le monde!Hello world!
Answer: D
Explanation:
NEW QUESTION # 161
Given:
List<String> longlist = List.of("Hello","World","Beat");
List<String> shortlist = new ArrayList<>();
Which code fragment correctly forms a short list of words containing the letter "e"?
- A. Option B
- B. Option C
- C. Option D
- D. Option A
Answer: B
NEW QUESTION # 162
Which two statements are true about the modular JDK? (Choose two.)
- A. It is possible but undesirable to configure modules' exports from the command line.
- B. The foundational APIs of the Java SE Platform are found in the java.base module.
- C. APIs are deprecated more aggressively because the JDK has been modularized.
- D. An application must be structured as modules in order to run on the modular JDK.
Answer: A,B
NEW QUESTION # 163
Given:
When is the readObject method called?
- A. after this object is serialized
- B. before this object Is serialized
- C. The method is never called.
- D. before this object is deserialized
- E. after this object is deserialized
Answer: E
NEW QUESTION # 164
......
The Oracle 1z1-819 exam covers a wide range of topics, including Java syntax and data types, object-oriented programming principles, collections, concurrency, I/O and NIO. It also includes topics such as JDBC, JPA, annotations, lambda expressions, and modules. 1z1-819 exam consists of 80 multiple-choice questions and has a time limit of 180 minutes. A passing score of 63% is required to obtain the certification.
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