11. Which of the following can get the number of elements in a one dimensional array arr?
a. arr.size
b. arr.length - 1
c. arr.length
d. arr.length()
Answer: c. arr.length
12. Which of the following is a Java keyword?
a. extern
c. volatile
d. friend
e. friendly
Answer: c. volatile
13. Using which modifier object encapsulates itself from the outside world?
a. private
b. protected
c. static
d. public
Answer: a. private
14. Which methods can access to private attributes of a class?
a. Only Static methods of the same class
b. Only instances of the same class
c. Only methods those defined in the same class
d. Only classes available in the same package.
Answer: c. Only methods those defined in the same class
15. Which of the following statements is true for constructor?
a. Constructor is called when an instance of the object is created
b. Constructor initializes the object
c. Java compiler creates a default constructor if a class doesn't have any
d. All of the above
Answer: d. All of the above
16. The constructor of a class has a return type
a. true
b. false
Answer: b. false
17. Which of the following expression is not valid?
a. short s = 23;
b. int num = '7';
c. double d = 1.5;
d. float f = 9.2;
Answer: b. int num = '7';
18. A top level class may have only the following access modifier. Select the one correct answer.
a. package
b. protected
c. private
d. public
Answer: d. public
19. Which of the following is Java keyword?
a. super
b. extern
c. synchronize
d. friend
Answer: a. super
20. Which modifier makes the method available to all classes in the same package and to all the subclasses of this class?
