Set 23

Multiple Choice Question

QID: 
197

Consider the following class and interface definitions (in separate files):

public class Sample implements IInt{
public static void main(String[] args){
Sample s = new Sample(); //1
int j = s.thevalue; //2
int k = IInt.thevalue; //3
int l = thevalue; //4
}
}public interface IInt{
int thevalue = 0;
}

What will happen when the above code is compiled and run?

Select 1 option

A. It will give an error at compile time at line //1.
B. It will give an error at compile time at line //2.
C. It will give an error at compile time at line //3
D. It will give an error at compile time at line //4.
E. It will compile and run without any problem.

Multiple Choice Question

QID: 
196

Which of the following statements are correct?

Select 3 options

A. An abstract class can be extended by an abstract or a concrete class.
B. A concrete class can be extended by an abstract or a concrete class.
C. An interface can be extended by another interface.
D. An interface can be extended by an abstract class.
E. An interface can be extended by a concrete class.
F. An abstract class cannot implement an interface.

True or False

QID: 
195

An abstract method cannot be overridden.

Select 1 option

A. True
B. False

Multiple Choice Question

QID: 
194

Which of the following statements is/are true?

Select 1 option

A. Subclasses must define all the abstract methods that the superclass defines.
B. A class implementing an interface must define all the methods of that interface.
C. A class cannot override the super class's constructor.
D. It is possible for two classes to be the superclass of each other.
E. An interface can implement multiple interfaces.

Multiple Choice Question

QID: 
193

Given:

//Insert code here
public abstract void draw();
}
//Insert code here
public void draw(){ System.out.println("in draw..."); }
}

Which of the following lines of code can be used to complete the above code?

Select 2 options

A. class Shape {
       and
       class Circle extends Shape {
B. public class Shape {
         and
      class Circle extends Shape {
C. abstract Shape {
          and
         public class Circle extends Shape {
D. public abstract class Shape {
           and
         class Circle extends Shape {
E. public abstract class Shape {
          and
       class Circle implements Shape {
F. public interface Shape {
          and
        class Circle implements Shape {

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