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Inheritence -Java Programming MCQ Questions and Answers

Learn competitive java programming mcq questions and answers on Inheritence with easy and logical explanations. Page-6 section-1

51
Using which of the following, multiple inheritance in Java can be implemented?
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Answer & Solution
Answer: Option A
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52
Which two classes use the Shape class correctly?
A. public class Circle implements Shape 
   {
    private int radius;
   }
B. public abstract class Circle extends Shape 
   {
    private int radius;
   }
C. public class Circle extends Shape 
   {
   private int radius;
   public void draw();
   }
D. public abstract class Circle implements Shape 
   {
    private int radius;
    public void draw();
   }
E. public class Circle extends Shape 
   {
    private int radius;
    public void draw()
    {
     /* code here */
    }
   }
F. public abstract class Circle implements Shape 
   {
     private int radius;
     public void draw() 
     { 
      /* code here */ 
     }
   }
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Answer & Solution
Answer: Option A
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53
Which of these method of Object class is used to obtain class of an object at run time?
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Answer & Solution
Answer: Option C
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54
If a class inheriting an abstract class does not define all of its function then it will be known as?
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Answer & Solution
Answer: Option A
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55
If super class and subclass have same variable name, which keyword should be used to use super class?
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Answer & Solution
Answer: Option A
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56
A class member declared protected becomes a member of subclass of which type?
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Answer & Solution
Answer: Option B
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57
Which of these method of Object class can clone an object?
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Answer & Solution
Answer: Option C
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58
All classes in Java are inherited from which class?
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Answer & Solution
Answer: Option D
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59
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();    
    }
}
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Answer & Solution
Answer: Option B
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60
What will be the output of the following Java code?
class A 
{
    int i;
    void display() 
    {
        System.out.println(i);
    }
}    
class B extends A 
{
    int j;
    void display() 
    {
        System.out.println(j);
    }
}    
class method_overriding 
{
    public static void main(String args[])
    {
        B obj = new B();
        obj.i=1;
        obj.j=2;   
        obj.display();     
    }
}
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Answer & Solution
Answer: Option C
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