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 */
}
}
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 */
}
}53. Which of these method of Object class is used to obtain class of an object at run time?
54. If a class inheriting an abstract class does not define all of its function then it will be known as?
55. If super class and subclass have same variable name, which keyword should be used to use super class?
56. A class member declared protected becomes a member of subclass of which type?
57. Which of these method of Object class can clone an object?
58. All classes in Java are inherited from which class?
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();
}
}
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();
}
}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();
}
}
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();
}
}