1z0-808 Free Practice Test

Which statement is true about the switch statement?

1. A. It must contain the default section.
2. B. The break statement, at the end of each case block, is optional.
3. C. Its case label literals can be changed at runtime.
4. D. Its expression must evaluate to a collection of values.

Correct Answer: B

Which two statements are true about Java byte code? (Choose two.)

1. A. It can be serialized across network.
2. B. It can run on any platform that has a Java compiler.
3. C. It can run on any platform.
4. D. It has “.java” extension.
5. E. It can run on any platform that has the Java Runtime Environment.

Correct Answer: AE

Given the code fragment:

Which three code fragments are valid at line n1?

1. A. Option A
2. B. Option B
3. C. Option C
4. D. Option D
5. E. Option E

Correct Answer: CDE

Which three statements are true about the structure of a Java class? (Choose three.)

1. A. A public class must have a main method.
2. B. A class can have only one private constructors.
3. C. A method can have the same name as a field.
4. D. A class can have overloaded static methods.
5. E. The methods are mandatory components of a class.
6. F. The fields need not be initialized before use.

Correct Answer: ACE

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

1. A. Encapsulation
2. B. Inheritance
3. C. Abstraction
4. D. Instantiation
5. E. Polymorphism

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