Free Practice Questions for Oracle 1Z0-808 Exam

Question 1

Given the code fragment:

What is the result?

ACompilation fails at both line n1 and line n2.

BCompilation fails only at line n2.

CCompilation fails only at line n1.

DJesse 25Walter 52

Correct Answer: A. Compilation fails at both line n1 and line n2.

Question 2

Given the code snippet from a compiled Java source file:

Which command-line arguments should you pass to the program to obtain the following output?

Arg is 2

Ajava MyFile 1 3 2 2

Bjava MyFile 2 2 2

Cjava MyFile 1 2 2 3 4

Djava MyFile 0 1 2 3

Correct Answer: A. java MyFile 1 3 2 2

Question 3

Given the code fragment:

What is the result?

AOption A

BOption B

COption C

DOption D

EOption E

Correct Answer: E. Option E

Question 4

Given the following classes:

Which two options fail to compile when placed at line n1 of the main method? (Choose two.)

Aemployee.salary = 50_000;

Bdirector.salary = 80_000;

Cemployee.budget = 200_000;

Dmanager.budget = 1_000_000;

Emanager.stockOption = 500;

Fdirector.stockOptions = 1_000;

Correct Answer: C. employee.budget = 200_000;; E. manager.stockOption = 500;

Question 5

Given the following main method:

What is the result?

A5 4 3 2 1 0

B5 4 3 2 1

C4 2 1

D5

ENothing is printed

Correct Answer: D. 5

Question 6

Given:

And given the code fragment:

What is the result?

ACompilation fails at line n2.

BRead Book

CRead E-Book

DCompilation fails at line n1.

ECompilation fails at line n3.

Correct Answer: E. Compilation fails at line n3.

Question 7

Given:

What is the result?

ACompilation fails.

B3 5

C0 0

D9 25

Correct Answer: B. 3 5

Question 8

Given the code fragment:

What is the result?

A[Robb, Rick, Bran]

B[Robb, Rick]

C[Robb, Bran, Rick, Bran]

DAn exception is thrown at runtime.

Correct Answer: A. [Robb, Rick, Bran]

Question 9

Given the code fragment:

What is the result?

AElement 0Element 1

BNull element 0Null element 1

CNullNull

DA NullPointerException is thrown at runtime.

Correct Answer: D. A NullPointerException is thrown at runtime.

Question 10

Given the code fragment:

Test.java:

Which is the result?

AOption A

BOption B

COption C

DOption D

EOption E

Correct Answer: D. Option D

Question 11

Given the code fragment from three files:

Which code fragment, when inserted at line 2, enables the code to compile?

AOption A

BOption B

COption C

DOption D

EOption E

Correct Answer: E. Option E

Question 12

Which statement is true about Java byte code?

AIt can run on any platform.

BIt can run on any platform only if it was compiled for that platform.

CIt can run on any platform that has the Java Runtime Environment.

DIt can run on any platform that has a Java compiler.

EIt can run on any platform only if that platform has both the Java Runtime Environment and a Java compiler.

Correct Answer: D. It can run on any platform that has a Java compiler.

Explanation:

Java bytecodes help make 'write once, run anywhere' possible. You can compile your program into bytecodes on any platform that has a Java compiler. The bytecodes can then be run on any implementation of the Java VM. That means that as long as a computer has a Java VM, the same program written in the Java programming language can run on Windows 2000, a Solaris workstation, or on an iMac.

Question 13

What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?

AEncapsulation

BInheritance

CAbstraction

DInstantiation

EPolymorphism

Correct Answer: A. Encapsulation

Explanation:

Using the private modifier is the main way that an object encapsulates itself and hide data from the outside world.

References:

Question 14

Given the code fragment:

What is the result?

AMay 04, 2014T00:00:00.000

B2014-05-04T00:00: 00.000

C5/4/14T00:00:00.000

DAn exception is thrown at runtime.

Correct Answer: D. An exception is thrown at runtime.

Question 15

Given:

What is the result?

ACompilation fails.

Bfalse true

Ctrue false

Dtrue true

Efalse false

Correct Answer: B. false true