gs gs128 Java Inheritance - Object Class in Java - Quiz No.1
gs gs128 Java Quiz
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Question 1: Which of these class is superclass of every class in Java?
String class
Object class
Abstract class
ArrayList class
Question 2: Which of these method of Object class can clone an object?
Objectcopy()
copy()
Object clone()
clone()
Question 3: Which of these method of Object class is used to obtain class of an object at run time?
get()
void getclass()
Class getclass()
None of the mentioned
Question 4: Which of these keywords can be used to prevent inheritance of a class?
super
constant
class
final
Question 5: Which of these keywords cannot be used for a class which has been declared final?
abstract
extends
abstract and extends
none of the mentioned
Question 6: Which of these class relies upon its subclasses for complete implementation of its methods?
Object class
abstract class
ArrayList class
None of the mentioned
Question 7: What will be the output of the following Java program?
abstract class A { int i; abstract void display(); } class B extends A { int j; void display() { System.out.println(j); } } class Abstract_demo { public static void main(String args[]) { B obj = new B(); obj.j=2; obj.display(); } }
0
2
Runtime Error
Compilation Error
Question 9: What will be the output of the following Java code?
class Output { public static void main(String args[]) { Object obj = new Object(); System.out.print(obj.getclass()); } }
Object
class Object
class java.lang.Object
Compilation Error
Question 10: What will be the output of the following Java code?
class A { int i; int j; A() { i = 1; j = 2; } } class Output { public static void main(String args[]) { A obj1 = new A(); System.out.print(obj1.toString()); } }
true
false
String associated with obj1
Compilation Error
