oracle 1Z0-819 Exam Questions
Questions for the 1Z0-819 were updated on : Nov 26 ,2024
Page 1 out of 15. Viewing questions 1-15 out of 214
Question 1
Given:
What is the result?
A. nothing
B. It fails to compile.
C. 0
D. A java.lang.IllegalArgumentException is thrown.
E. 10
Answer:
B
Question 2
Given:
Which two changes need to be made to make this class compile? (Choose two.)
- A. Change Line 1 to an abstract class:public abstract class API {
- B. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;
- C. Change Line 1 to a class:public class API {
- D. Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {
- E. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;
Answer:
C,E
Question 3
Which two modules include APIs in the Java SE Specification? (Choose two.)
- A. java.logging
- B. java.desktop
- C. javafx
- D. jdk.httpserver
- E. jdk.jartool
Answer:
A,D
Reference: https://docs.oracle.com/javase/9/docs/api/overview-summary.html
Question 4
Given:
What is the output?
A. 300
B. Exception
C. 200
D. 100
Answer:
A
Question 5
Which two statements are true about the modular JDK? (Choose two.)
- A. The foundational APIs of the Java SE Platform are found in the java.base module.
- B. An application must be structured as modules in order to run on the modular JDK.
- C. It is possible but undesirable to configure modules’ exports from the command line.
- D. APIs are deprecated more aggressively because the JDK has been modularized.
Answer:
A, C
Question 6
Given the code fragment:
What is the result?
- A. -1 : 2
- B. 2 : -1
- C. 2 : 3
- D. 3 : 0
Answer:
B
Question 7
Given:
What is the result?
- A. The compilation fails.
- B. abdf
- C. abd
- D. adf
- E. abcd
Answer:
E
Question 8
Which set of commands is necessary to create and run a custom runtime image from Java source
files?
- A. java, jdeps
- B. javac, jlink
- C. jar, jlink
- D. javac, jar
Answer:
B
Reference:
https://blogs.oracle.com/jtc/automating-the-creation-of-jdk9-reduced-runtime-images-
in-netbeans
Question 9
Given:
What is the result?
A. 4
B. 3
C. An exception is thrown at runtime.
D. 5
Answer:
D
Question 10
Given:
It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?
- A. setLeft and setRight must be protected.
- B. left and right must be private.
- C. isValid must be public.
- D. left, right, setLeft, and setRight must be private.
Answer:
B
Question 11
Given:
What is the result?
- A. 5
- B. 3
- C. 23
- D. 25
- E. 11
Answer:
E
Question 12
Given:
What is the result?
A. 2,34,34,5
B. 2,34,54,5
C. 2,54,54,5
D. 2,34,54,3
Answer:
C
Question 13
Given:
What is the result?
- A. It throws a runtime exception.
- B. Value of Euler = 2.71828
- C. The code does not compile.
- D. Value of Euler = “2.71828”
Answer:
C
Question 14
Given:
executed using this command:
java Myclass My Car is red
What is the output of this class?
- A. Car--red--My
- B. My--Car--is
- C. My--is--java
- D. java--Myclass--My
- E. Myclass--Car--red
Answer:
A
Question 15
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