Core Java Online Test Questions and Answers - 2

11. Which access modifier makes a method available to all the classes in the same package and to all the subclasses of the class?

a. public
b. default
c. private
d. protected


12. Which of the following is not a return type?

a. public
b. void
c. boolean
d. Button


13. What is a Java String's default initial value?

a. null
b. ""
c. 0
d. None of the above



14. Is an array an object in Java?

a. Yes  
b. No


15. Which expression can be used to access the last element of an array?

a. array[array.length]
b. array[array.length - 1]
c. array[array.length() - 1]
d array[array.length()]


16. An exception can be thrown by throws keyword explicitly.

a. Yes
b. No


17. Garbage collection cannot be forced. The programmer cannot force the JVM to free the memory used by an object.

a. Yes
b. No


18. All the wrapper classes (Integer, Boolean, Float, Short, Long, Double and Character) in java

a. are final
b. are private
c. are serializable
d. are immutatable


19. Which of the following are legal identifier names in Java?

a. %abcd
b. $abcd
c. 1abcd
d. package


20. Which of the following statements would compile when String s = new String("xyz"); ?

a. s = 2 * s;
b. int i = s[0];
c. s = s + s;  
d. s = s >> 2;