Tag: technology

Questions Related to technology

The use of protected keyword to a member in a class will restrict its visibility as follows
technology

  1. Visible only inside the package

  2. Visible only in the class and its subclass in the same package

  3. Visible in all classes in the same package and subclasses in other packages

  4. Visible only in the class where it is declared

Show answer
Correct Option: C

Which of the following statements about abstract methods/classes in Java are true?1. An abstract class cannot be instantiated.2. Constructors cannot be abstract.3. A subclass of an abstract class must defined the abstract methods.4. Static methods may be declared abstract.
technology

  1. Line 1, line 2 and line 3 only

  2. Line 1 only

  3. Line 1 and line 2 only

  4. Line 2 only

  5. All are true

Show answer
Correct Option: C

We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
technology

  1. private

  2. public

  3. private OR protected

  4. protected

Show answer
Correct Option: C

Which of the following keywords are used to control access to a class member? (A) default (B) abstract (C) protected (D) interface (E) public
technology

  1. All of these

  2. (A), (C) & (E)

  3. (C) & (E)

  4. (B), (C) & (E)

Show answer
Correct Option: D

Which of the following are keywords? (A) switch (B) integer (C) default (D) boolean (E) object
technology

  1. (B) & (C)

  2. (E)

  3. (A) & (C)

  4. (D)

Show answer
Correct Option: C

The keywords reserved but not used in the initial version of Java are: (A) union (B) const (C) inner (D) goto (E) boolean (F) synchronized
technology

  1. All of these

  2. (C) & (E)

  3. (A), (C) & (E)

  4. (B),(C) & (D)

Show answer
Correct Option: D
Explanation:

To solve this question, the user needs to have knowledge about the initial version of Java and the keywords that were reserved but not used. The user must then identify which options list the correct keywords.

The correct answer is:

D. (B),(C) & (D)

Explanation:

In the initial version of Java, the keywords "const" and "goto" were reserved but not used. The keyword "inner" was not reserved at all in the initial version of Java. The other options, "union", "boolean", and "synchronized" were not keywords in the initial version of Java.

Therefore, options (A) and (C) are incorrect as they include options that were not reserved in the initial version of Java. Option (B) is incorrect as "boolean" was not a reserved keyword in the initial version of Java. Option (D), on the other hand, correctly lists all the keywords that were reserved but not used in the initial version of Java, which are "const", "goto", and "inner".

The Answer is: D. (B),(C) & (D)

Which of the following are not keywords?(A) NULL(B) implements(C) protected(D) extended(E) string
technology

  1. (D) & (E)

  2. (A), (D) & (E)

  3. (D)

  4. (C), (D) & (E)

Show answer
Correct Option: B

Which keyword can protect a class in a package from accessibility by the classes outside the package?

technology web technology

  1. private

  2. b.final

  3. c.protected

  4. d.don't use any keyword at all (make it default)

Show answer
Correct Option: D

Which of the following statements about abstract methods/classes in Java are true? 1. An abstract class cannot be instantiated. 2. Constructors cannot be abstract. 3. A subclass of an abstract class must defined the abstract methods. 4. Static methods may be declared abstract.

technology web technology

  1. Line 1, line 2 and line 3 only

  2. b.Line 1 only

  3. c.Line 1 and line 2 only

  4. d.Line 2 only

Show answer
Correct Option: C

The use of protected keyword to a member in a class will restrict its visibility as follows:
technology web technology

  1. Visible only inside the package.

  2. b.Visible only in the class and its subclass in the same package.

  3. c.Visible in all classes in the same package and subclasses in other packages.

  4. d.Visible only in the class where it is declared.

Show answer
Correct Option: C