Which of these class is superclass of every class in Java? a) String class b) Ob

Question

Which of these class is superclass of every class in Java?
a) String class
b) Object class
c) Abstract class
d) ArrayList class

ANS:______________________________

Which of these keywords can be used to prevent inheritance of a class?
a) super
b) constant
c) Class
d) final

ANS:___________________________

Which of these class relies upon its subclasses for complete implementation of its methods?
a) Object class
b) abstract class
c) ArrayList class
d) None of the mentioned

4. Which of the following statements are incorrect?
a) static methods can call other static methods only.
b) static methods must only access static data.
c) static methods can not refer to this or super in any way.
d) when object of class is declared, each object contains its own copy of static variables.

ANS:________________

Which of these keywords is used to prevent content of a variable from being modified?
a) final
b) last
c) constant
d) static

ANS:_____________________

Explanation / Answer

Question 1:

Answer: b) Object class

object class class is superclass of all other classes.

Question 2:

Answer:d) final

Question 3:

Answer:b) abstract class

all the methods defined in abstract class need to define the method implementation in its subclass

Question 4:

Answer: d) when object of class is declared, each object contains its own copy of static variables.

All objects of class share same static variable,

Question 5:

Answer: a) final

final preverts from modifiying the data

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